Cal Fire Local 2881 v. Cal. Pub. Employees' Retirement System ( 2019 )


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  •         IN THE SUPREME COURT OF
    CALIFORNIA
    CAL FIRE LOCAL 2881 et al.,
    Plaintiffs and Appellants,
    v.
    CALIFORNIA PUBLIC EMPLOYEES’ RETIREMENT SYSTEM,
    Defendant and Respondent;
    STATE OF CALIFORNIA,
    Intervener and Respondent.
    S239958
    First Appellate District, Division Three
    A142793
    Alameda County Superior Court
    RG12661622
    March 4, 2019
    Chief Justice Cantil-Sakauye authored the opinion of the court,
    in which Justices Chin, Corrigan, Liu, Cuéllar, Kruger, and
    Zelon* concurred.
    *
    Associate Justice of the Court of Appeal, Second Appellate
    District, Division Seven, assigned by the Chief Justice pursuant
    to article VI, section 6 of the California Constitution.
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC
    EMPLOYEES’ RETIREMENT SYSTEM
    S239958
    Opinion of the Court by Cantil-Sakauye, C. J.
    In late 2012, our Legislature enacted the California
    Public Employees’ Pension Reform Act of 2013 (PEPRA, Stats.
    2012, ch. 296, § 15; see Gov. Code, §§ 7222 et seq.),
    substantially revising the laws governing public employee
    pensions.1 This decision addresses the constitutionality of one
    of the changes effected by PEPRA, the elimination of the
    opportunity for public employees to purchase additional
    retirement service credit.
    The amount of a public employee’s pension benefit is
    typically calculated as a fraction of the employee’s annual
    compensation near the end of his or her career. The size of the
    fraction is generally determined by the employee’s years of
    public employment, known as “service credit,” and his or her
    age at retirement. The greater the service credit of an
    employee and the greater his or her age at retirement, the
    larger the fraction.
    Beginning in 2003, many public employees were granted
    the opportunity to purchase up to five years of service credit by
    making appropriate payments to their pension fund. This
    1
    Unless indicated otherwise, all       further   statutory
    citations are to the Government Code.
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    purchased credit, known as additional retirement service
    (ARS) credit, is treated like ordinary service credit upon an
    employee’s retirement.       Participating employees could
    therefore receive pension benefits calculated on the basis of up
    to five years’ more public employment than they actually
    worked. PEPRA effectively repealed the statute granting
    public employees the opportunity to purchase ARS credit,
    although it did not alter the rights of employees who had
    already purchased such credit.
    The parties present two issues for decision. The first is
    whether the opportunity to purchase ARS credit was a “vested
    right” — that is, a right protected by the constitutional
    contract clause.      The terms and conditions of public
    employment are ordinarily considered to be statutory rather
    than contractual, and they are subject to modification at the
    discretion of the governing legislative body. Constitutional
    protection can arise, however, (1) when the statute or
    ordinance establishing a benefit of employment and the
    circumstances of its enactment clearly evince an intent by the
    relevant legislative body to create contractual rights or, (2)
    when, even in the absence of a manifest legislative intent to
    create such rights, contractual rights are implied as a result of
    the nature of the employment benefit, as is the case with
    pension rights. The second issue, which arises only if we
    conclude that the opportunity to purchase ARS credit is
    entitled to constitutional protection, is whether the
    Legislature’s elimination of that benefit in PEPRA constituted
    an unconstitutional impairment of public employees’ vested
    rights.
    2
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    We conclude that the opportunity to purchase ARS credit
    was not a right protected by the contract clause. There is no
    indication in the statute conferring the opportunity to
    purchase ARS credit that the Legislature intended to create
    contractual rights. Further, unlike core pension rights, the
    opportunity to purchase ARS credit was not granted to public
    employees as deferred compensation for their work, and here
    we find no other basis for concluding that the opportunity to
    purchase ARS credit is protected by the contract clause. In the
    absence of constitutional protection, the opportunity to
    purchase ARS credit could be altered or eliminated at the
    discretion of the Legislature. We therefore affirm the decisions
    of the trial court and the Court of Appeal, which concluded that
    PEPRA’s elimination of the opportunity to purchase ARS credit
    did not violate the Constitution.
    Because we reach this conclusion, we have no occasion to
    address the second issue raised by the parties: whether the
    elimination of the opportunity to purchase ARS credit was an
    unconstitutional impairment of public employees’ vested
    rights. The scope of constitutional protection afforded public
    pension rights by our prior decisions, beginning with Allen v.
    City of Long Beach (1955) 
    45 Cal.2d 128
     (Allen), has come to be
    referred to as the “California Rule,” in part because its breadth
    has not been widely adopted by other jurisdictions. (See, e.g.,
    Monahan, Statutes as Contracts? The “California Rule” and Its
    Impact on Public Pension Reform (2012) 97 Iowa L.Rev. 1029,
    1032, 1071-1074 (Monahan) [referring to our doctrine as the
    “so-called California Rule” and noting that, of the twelve states
    to adopt the rule, three have since modified it].) The state and
    many amici urge us to use this decision as a vehicle to reduce
    3
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    the protection afforded pension rights by modifying or
    abandoning the California Rule, while plaintiffs and many
    other amici urge us to leave the California Rule intact.
    Because we conclude that the opportunity to purchase ARS
    credit was not a term and condition of public employment
    protected from impairment by the contract clause, its
    elimination does not implicate the Constitution. For that
    reason, we have no occasion in this decision to address, let
    alone to alter, the continued application of the California Rule.
    I. FACTUAL AND PROCEDURAL BACKGROUND
    A. State Employee Pensions
    Although a number of different pension plans cover
    public employees in California, governed by a variety of
    statutes, local regulations, and agreements, the plans tend to
    operate in a similar manner. Here, we discuss provisions
    relating to state workers as an illustrative example.2 State
    employees are members of the California Public Employees
    Retirement System (CalPERS), the state pension system. Both
    state employees and their employers are required to make
    contributions to CalPERS during the course of their
    employment.       (§§ 20170 [creating the Public Employees
    Retirement Fund]; 20176; 20671 et seq.; 20790 et seq.) With
    some exceptions, a state employee does not become eligible to
    2
    Although we discuss state employee pensions, the ban on
    ARS credit enacted by PEPRA applies to all “public retirement
    system[s],” defined broadly by PEPRA as “any pension or
    retirement system of a public employer.” (§§ 7522.04, subd. (j)
    [defining public retirement system]; 7522.46, subd. (a)
    [banning ARS credit for all public retirement systems].)
    4
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    receive a pension until he or she has worked for the state for at
    least five years and has attained the age of 50. (§ 21060, subd.
    (a).) Persons who leave state service without five years of
    service or who otherwise are “permanently separated” from
    state employment prior to taking retirement can elect to have
    their pension contributions returned to them, rather than
    remaining a member of CalPERS. (§§ 20731, subd. (b)(3);
    20734.)
    Once vested state employees reach the minimum
    retirement age, they are eligible to retire and begin receiving
    monthly retirement benefits.3 (§ 21250 [benefits paid in
    monthly installments].) As noted, the amount of the benefit is
    generally determined by the individual employee’s
    compensation, age at retirement, and years of service. As an
    3
    The use of the term “vested” is potentially confusing here
    because the term is used in two different ways in discussing
    pensions. As noted, public employees become eligible to receive
    a pension only after some minimum period of public
    employment, typically five years. (E.g., § 21060, subd. (a).)
    Once an employee has become qualified to receive a pension by
    satisfying the minimum service requirement, he or she is said
    to be “vested” with respect to the receipt of a pension. That is
    not the same as having a “vested right.” That term has come
    to refer to a benefit of public employment whose repeal or other
    divestment is constrained by the constitutional contract clause.
    Public employees acquire a vested right in their pension at the
    inception of employment, even though they generally do not
    become vested with respect to its receipt until after five years
    of employment. (E.g., Packer v. Board of Retirement (1950) 
    35 Cal.2d 212
    , 214 [“a public employee, as a part of his
    compensation, obtain[s] a vested right to a pension upon
    entering his duties”].)
    5
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    example, the pension benefits of one subgroup of state and
    university employees are determined from a table in section
    21354.1. The table sets a covered employee’s yearly pension
    benefit at 2 percent of the employee’s “final compensation,”
    multiplied by the member’s years of service credit, further
    multiplied by a number derived from the table.4 The latter
    number is determined by the member’s age at retirement and
    increases from a minimum of .550 at age 50 to a maximum of
    1.250, applicable to retirees of age 63 and over. (§ 21354.1,
    subd. (a).) The net effect is to grant a pension equal to 2
    percent of a member’s final compensation per year of service
    for retirement at age 55, rising to 2.5 percent of final
    compensation per year of service for retirement at age 63 or
    above; retirement between the ages of 50 and 55 results in a
    less generous pension benefit. (Ibid.) At least a dozen similar
    schedules are found in the Government Code, applicable to
    different categories of public employees but offering benefits
    calculated in the same general way.5
    4
    Generally speaking, “final compensation” is an
    employee’s annual compensation, determined in various ways
    for different systems.     For many state employees, final
    compensation is their highest compensation earned during any
    consecutive 12-month period of state service. (§ 20035, subd.
    (a).) For persons hired after the effective date of PEPRA, final
    compensation is the highest average annual compensation
    during any period of at least 36 consecutive months.
    (§ 7522.32, subd. (a).)
    5
    See §§ 21353, 21353.5, 21354, 21354.3, 21354.4, 21354.5,
    21362, 21363, 21363.1, 21366, 21368, 21369, 21369.1, 21369.2,
    21370. Plaintiffs state in their opening brief that they and
    their fellow union members are covered by section 21363.4,
    6
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    B. Additional Retirement Service Credit
    State employees and other members of CalPERS were
    granted the opportunity to purchase ARS credit in 2003 by the
    enactment of section 20909 (Stats. 2003, ch. 838, § 1); teachers
    had been granted the opportunity in 1997 (Ed. Code, § 22826;
    Stats. 1997, ch. 569, § 2). The concept of purchasing service
    credit did not originate with ARS credit. Members who had
    performed military service or other “public service,” as defined
    by statute, had long been able to obtain pension service credit
    for that time by making appropriate payments to CalPERS.
    (§ 21020; See §§ 20997, 21010 et seq.; Marzec v. Public
    Employment Retirement System (2015) 
    236 Cal.App.4th 889
    ,
    897.) Section 20909, however, was the first opportunity for
    state employees to acquire “nonqualified” service credit, or
    service credit that did not reflect any type of service. (See 
    26 U.S.C. § 415
    (n)(3)(C) [defining “nonqualified service credit”];
    § 7522.46, subd. (a).) Because ARS credit is untethered to
    actual service, it acquired the nickname “ ‘air time.’ ” (Assem.
    Com. on Pub. Employees, Retirement and Social Security,
    Analysis of Assem. Bill 719 (2003-2004 Reg. Sess.) Apr. 23,
    2003, at p. 2.)6
    which provides for a pension of 3 percent of final compensation
    per year of service credit, regardless of the member’s age at
    retirement beyond the minimum age of 50. (Id. subd (a).)
    6
    Limited excerpts from the legislative histories of PEPRA
    and section 20909 were included in the record before the trial
    court. We have also consulted more complete legislative
    histories compiled and maintained by our library, based
    largely on materials in the files of the California State
    Archives.
    7
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    Under section 20909, a public employee with at least five
    years of public employment could, at any time prior to his or
    her retirement, make a one-time election to purchase from one
    to five years of ARS credit. (Id. subds. (a), (b).) These
    conditions of purchase are consistent with the requirements of
    federal tax law, which authorizes a tax-qualified retirement
    plan to provide for the acquisition of up to five years of
    nonqualified service credit after a member has participated in
    the plan for at least five years. (
    26 U.S.C. § 415
    (n)(3)(B); see
    Sen. Rules Com., Off. of Sen. Floor Analyses, 3d reading
    analysis of Assem. Bill 719 (2003-2004 Reg. Sess.) as amended
    Aug. 18, 2003, p. 3 (hereafter, Sen. Rules Analysis).) To
    acquire ARS credit, the member was required to pay CalPERS,
    either in a lump sum or installments, “an amount equal to the
    increase in employer liability, using the payrate and other
    factors affecting liability on the date of the request for costing
    of the service credit,” a figure calculated by CalPERS.
    (§§ 21050, subd. (a); 21052.) In other words, the employee was
    required to pay the present value of the increase in his or her
    pension benefits that would result from the purchased ARS
    credit, at least to the extent that increase could be estimated
    from circumstances prevailing at the time the employee
    exercised the opportunity to purchase ARS credit.
    When section 20909 was enacted, the purchase of ARS
    credit was viewed as particularly beneficial to employees who
    joined public service comparatively late in life or who left
    public employment temporarily to raise children or to further
    their education, and therefore had been unable to acquire
    sufficient service credit for a “livable retirement income.” (Sen.
    Rules Analysis, supra, at p. 4.) It was anticipated that the
    8
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    financial burden on employees of purchasing ARS credit would
    be partially mitigated because ARS credit could, and
    presumably often would, be financed with funds withdrawn
    from tax-qualified retirement savings accounts, such as 401(k)
    accounts. (Ibid.)
    The Legislature anticipated that ARS credit would be
    “cost neutral” to public agencies, since employees were
    required to pay CalPERS the full present value of the future
    benefits. (Sen. Rules Analysis, supra, at p. 3.) Yet even then,
    it was recognized that the eventual cost of ARS credit might
    exceed the purchase price paid by pensioners, most obviously
    for employees who experienced a significant increase in salary
    between the time of purchasing ARS credit and their
    retirement. (State and Consumer Services Agency, Enrolled
    Bill Rep., Assem. Bill 719 (2003-2004 Reg. Sess.) p. 4.) As the
    Department of Finance pointed out in opposing the enactment
    of section 20909, CalPERS was required to make a variety of
    assumptions in calculating the present value of ARS credit, all
    of which “contain a high degree of inaccuracy.” (Department of
    Finance, Bill Analysis/Enrolled Bill Rep., Assem. Bill 719
    (2003-2004 Reg. Sess.) Mar. 24, 2003, at p. 2.) In an analysis
    performed for the years 1997 to 2007, CalPERS found that, in
    practice, its methodology for calculating the price of ARS credit
    had underestimated its actual cost by 12 percent to 38 percent
    for various categories of state workers. (CalPERS, Review of
    Additional Retirement Service Credit Purchases (undated) p.
    6.) CalPERS recommended revising its calculations to increase
    prices accordingly. (Ibid.)
    9
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    C. PEPRA
    The centerpiece of PEPRA was a pension plan applicable
    only to newly hired public employees that is less expansive,
    and therefore less burdensome for the state and local
    governments, than the plans covering then-existing public
    employees. As compared to existing employees’ pensions, the
    new plan increased the age at which employees could claim
    equivalent pension benefits, set a cap on the total
    compensation on which pension benefits could be based,
    required employees to pay one-half of the cost of funding their
    pensions, and required the annual compensation used to
    calculate pension benefits to be determined by averaging over
    a three-year period, rather than using a single year. (§§
    7522.02, subd. (b); 7522.10, subds. (c), (g); 7522.20, subd. (a);
    7522.30, subd. (a); 7522.32, subd. (a).) All of these are less
    favorable than the equivalent benefits typically available to
    then-existing public employees.
    PEPRA also modified certain statutes governing the
    pensions of existing employees. One of these provisions,
    section 7522.46, eliminated the purchase of ARS credit by
    public employees after December 31, 2012. (§ 7522.46, subds.
    (a), (b); Stats. 2012, ch. 296, § 15.) In clean-up legislation
    initiated by CalPERS the following year, this provision was
    incorporated into section 20909 itself, which now states, in
    part, “This section shall apply only to an application to
    purchase additional retirement credit that was received by the
    system prior to January 1, 2013, that is subsequently approved
    by the system.” (Id. subd. (g), as amended by Stats. 2013, ch.
    526, § 13.)
    10
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    So far as we have been able to ascertain, there is nothing
    in the legislative history that explains the Legislature’s
    decision to terminate the purchase of ARS credit. Its likely
    intent, however, can be inferred from a 12-point plan for
    pension reform that formed the foundation for PEPRA,
    published by Governor Edmund G. Brown, Jr. in October
    2011.7 In recommending the termination of ARS credit, the
    Governor’s plan stated, “Many pension systems allow
    employees to buy ‘airtime,’ additional retirement service credit
    for time not actually worked. When an employee buys airtime,
    the public employer assumes the full risk of delivering
    retirement income based on those years of purchased service
    credit. Pensions are intended to provide retirement stability
    for time actually worked.         Employers, and ultimately
    taxpayers, should not bear the burden of guaranteeing the
    additional employee investment risk that comes with airtime
    purchases.” (Governor Edmund G. Brown, Jr., Twelve Point
    Pension     Reform     Plan,    Oct.     27,    2011,     p.   4
     [as of Mar. 4, 2019]; all Internet citations in this
    7
    See Sen. Rules Com., Off. of Sen. Floor Analyses
    Conference Completed Rep., Assem. Bill 340 (2011-2012 Reg.
    Sess.) Aug. 28, 2012, p. 7 [“The comprehensive pension reform
    proposal contained in the Conference Committee Report is
    based on the Governor’s 12-Point Pension Reform Plan. [¶]
    The Conference Committee Report includes 10 of the 12 points
    included in the Governor’s plan.”].
    11
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    opinion are archived by year, docket number, and case name at
    .)
    D. This Litigation
    Plaintiff and appellant Cal Fire Local 2881 (Union) is a
    labor association whose members are employees of the
    California Department of Forestry and Fire Protection, known
    as “Cal Fire.” The four individual plaintiffs are Cal Fire
    employees. Plaintiffs filed a petition for a writ of mandate
    against CalPERS challenging the elimination of ARS credit,
    contending that the opportunity to purchase ARS credit was a
    vested right protected by the contract clause of the California
    Constitution. The trial court approved a stipulation permitting
    the state to intervene.
    The trial court denied the petition, ruling that the
    opportunity to purchase ARS credit was not protected by the
    Constitution and, even if it were, its elimination was a
    “ ‘permissible modification to the pension plan’ ” because it was
    “materially related to the theory and successful operation of a
    pension system.” (See Cal Fire Local 2881 v. California Public
    Employees Retirement System (2016) 
    7 Cal.App.5th 115
    , 123,
    129 (Cal Fire).) The Court of Appeal affirmed on both grounds
    in a published decision. (Id. at pp. 127, 129.) That court based
    its conclusion that the opportunity to purchase ARS credit was
    not constitutionally protected on the absence of any indication
    of legislative intent to create a contractual right. (Id. at
    pp. 127-128.) It also held that the opportunity was properly
    eliminated, even if it was protected by the constitution, on
    reasoning similar to that of the trial court. (Id. at pp. 129-131.)
    For the reasons discussed below, we agree with both
    courts that the opportunity to purchase ARS credit was not a
    12
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    benefit of employment protected by the constitutional contract
    clause. Given that conclusion, we have no occasion to reach
    the further question whether, if it were so protected, its
    elimination would have worked an unconstitutional
    impairment of public employees’ contractual rights.
    II. DISCUSSION
    Whether the opportunity for existing public employees to
    purchase ARS credit is a benefit of employment protected by
    the constitutional contract clause — that is, whether it is a
    vested right — is a question of law subject to our independent
    review.    (Board of Administration v. Wilson (1997) 
    52 Cal.App.4th 1109
    , 1128-1129 (Wilson).)
    A. Constitutional Protection of the Terms and
    Conditions of Public Employment Has
    Historically Been the Exception, Not the Rule
    The vested rights doctrine, the foundation of plaintiffs’
    contention that PEPRA’s elimination of the opportunity for
    existing public employees to purchase ARS credit was
    unconstitutional, is grounded in the constitutional contract
    clause. Both the United States and California Constitutions
    contain provisions that prohibit the enactment of laws effecting
    a “substantial impairment” of contracts, including contracts of
    employment.8 (Sveen v. Melin (2018) 584 U.S. __ , 
    138 S.Ct. 8
    See United States Constitution, article I, section 10,
    clause 1 [“No state shall . . . pass any . . . law impairing the
    obligation of contracts . . . .”] and California Constitution,
    article I, section 9 [“A . . . law impairing the obligation of
    contracts may not be passed”]. As noted above, plaintiffs bring
    this challenge under the California Constitution.
    13
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    1815, 1821-1822 (Sveen); San Francisco Taxpayers Assn v.
    Board of Supervisors (1992) 
    2 Cal.4th 571
    , 584; see Allen v.
    Board of Administrators (1983) 
    34 Cal.3d 114
    , 119.)
    “The Contracts Clause restricts the power of States to disrupt
    contractual arrangements. . . . The origins of the Clause lie in
    legislation enacted after the Revolutionary War to relieve
    debtors of their obligations to creditors. [Citation.] But the
    Clause applies to any kind of contract.” (Sveen, 138 S.Ct. at p.
    1821.)    The federal contract clause restricts states from
    impairing their own contracts, as well as those between private
    parties. (United States Trust Co. v. New Jersey (1977) 
    431 U.S. 1
     (United States Trust).) In this context, the term “vested
    right” has come to refer to the terms and conditions of public
    employment that are protected from impairment by the
    constitutional contract clause. (See ante, fn. 3.)
    Contract clause protection of the terms and conditions of
    public employment historically has been the exception, rather
    than the rule.       “[T]he terms and conditions of public
    employment, unlike those of private employment, generally are
    established by statute or other comparable enactment (e.g.,
    charter provision or ordinance) rather than by contract.”
    (White v. Davis (2003) 
    30 Cal.4th 528
    , 564 (White).) For this
    reason, public employees have generally been held to possess
    no constitutionally protected rights in the terms and conditions
    of their employment. “[I]t is well settled in California that
    public employment is not held by contract but by statute and
    that, insofar as the duration of such employment is concerned,
    no employee has a vested contractual right to continue in
    employment beyond the time or contrary to the terms and
    conditions fixed by law.” (Miller v. State of California (1977)
    14
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    
    18 Cal.3d 808
    , 813 (Miller).) It is also “well settled that public
    employees have no vested right in any particular measure of
    compensation or benefits, and that these may be modified or
    reduced by the proper statutory authority.” (Butterworth v.
    Boyd (1938) 
    12 Cal.2d 140
    , 150 (Butterworth).)              As we
    explained in Retired Employees Assn. of Orange County v.
    County of Orange (2011) 
    52 Cal.4th 1171
     (Retired Employees),
    “ ‘the principal function of a legislature is not to make
    contracts, but to make laws that establish the policy of the
    [governmental body]. [Citation.] Policies, unlike contracts, are
    inherently subject to revision and repeal.’ ” (Id. at p. 1185.)
    In the eighty years since Butterworth, the growing
    prevalence of collective bargaining by public employees has
    dramatically increased the number of employees whose terms
    and conditions of employment are governed by express
    contracts, rather than solely by legislative enactments. (See
    Meyers-Milias-Brown Act, §§ 3500 et seq. [regulating collective
    bargaining by local agency employees]; Ralph D. Dills Act, §§
    3512 et seq. [regulating collective bargaining by state
    employees].) At least for the term of their collective bargaining
    agreement, the employment of such employees is largely a
    matter of contract, not statute. (See, e.g., Retired Employees,
    supra, 52 Cal.4th at p. 1182 [“our ‘often quoted language that
    public employment is not held by contract’ has limited
    force where, as here, the parties are legally authorized to enter
    (and have in fact entered) into bilateral contracts to govern the
    employment relationship”]; Vallejo Police Officers Ass’n v. City
    of Vallejo (2017) 
    15 Cal.App.5th 601
    , 612 (Vallejo Police) [“Like
    other contracts, MOU’s [memoranda of understanding]
    ordinarily cover distinct periods of time, and the obligations
    15
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    associated with      them     ordinarily      terminate      with   the
    agreement”].)
    Yet the growing prevalence of public employment
    agreements has not altered the fundamental principle that the
    terms and conditions of public employment, to the extent those
    terms and conditions derive from legislative enactments, are
    not generally protected by the contract clause from repeal or
    revision at the discretion of the legislative body. There
    continues to be a large number of public employees whose
    employment is not governed by an agreement. Even for public
    employees covered by an express employment contract, the
    issue has continued application. The covered terms and
    conditions of their employment may be immune from
    legislative modification during the term of the express
    agreement, but disputed issues continue to arise regarding the
    legislative body’s power to alter the terms and conditions of
    employment that are not covered by the agreement or to alter
    the terms and conditions established by the agreement after its
    expiration. (See, e.g., Retired Employees, supra, 52 Cal.4th at
    pp. 1176, 1177-1178 [considering whether retirees could
    acquire a vested right in a health premium methodology not
    specified in their MOU]; Vallejo Police, at pp. 614-620 [finding
    no vested right to retiree medical contributions following
    expiration of MOU]; Chisom v. Board of Retirement of Fresno
    County Employees’ Retirement Ass’n (2013) 
    218 Cal.App.4th 400
    , 414-416.)
    Our decisions have recognized two exceptions to the
    general rule permitting legislative modification of statutory
    terms and conditions of public employment.         The first,
    applicable to statutorily created employment rights generally,
    16
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    affords the protection of the contract clause to statutory terms
    and conditions of public employment when the statute or
    ordinance establishing the benefit and the circumstances of its
    enactment clearly evince a legislative intent to create
    contractual rights. The second exception, which this court has
    historically extended primarily to pension rights, protects
    certain benefits of public employment by implication, even in
    the absence of a clear manifestation of legislative intent. Both
    of these means for creating vested rights are invoked by
    plaintiffs, and we address them separately below.
    B. Manifestly Intended Contractual Rights
    1. Terms and conditions of public employment are
    protected by the contract clause when the
    circumstances clearly evince a legislative intent to
    create contractual rights
    Notwithstanding the general rule that legislative
    enactments do not create rights protected by the contract
    clause, the United States Supreme Court has long recognized
    an exception when the legislation at issue manifests an intent
    to create contractual rights. In United States Trust, supra, 
    431 U.S. 1
    , the legislatures of New York and New Jersey had both
    approved a statutory covenant limiting the use of mass transit
    revenues to subsidize passenger rail transit, a covenant both
    states later repealed. (Id. at p. 3.) In evaluating bondholders’
    claim that the states’ joint repeal of the covenant
    impermissibly impaired their rights under the federal contract
    clause, the high court recognized that “a statute is itself
    treated as a contract when the language and circumstances
    evince a legislative intent to create private rights of a
    contractual nature enforceable against the State.” (Id. at p. 17,
    17
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    fn. 14.) In United States Trust, the court found it “unnecessary
    . . . to dwell on the criteria for determining whether state
    legislation gives rise to a contractual obligation” because “[t]he
    intent to make a contract is clear from the statutory
    language . . . . Moreover, . . . the purpose of the covenant was
    to invoke the constitutional protection of the Contract Clause
    as security against repeal [of the covenant legislation].” (Id. at
    pp. 17-18, citations omitted.)
    We have recognized the same principle. In Retired
    Employees, we held that the resolutions of a board of
    supervisors governing the terms and conditions of county
    employment could create implied contractual rights “when the
    language or circumstances accompanying [enactment of the
    resolutions] clearly evince a legislative intent to create private
    rights of a contractual nature.” (Retired Employees, supra, 52
    Cal.4th at p. 1177; see also Youngman v. Nevada Irrigation
    District (1969) 
    70 Cal.2d 240
    , 246-247 (Youngman) [district
    employees successfully pleaded an implied contractual right to
    the implementation of a salary schedule].)9
    Retired Employees addressed the question, submitted to
    us by the Ninth Circuit Court of Appeals, “ ‘[w]hether, as a
    matter of California law, a California county and its employees
    can form an implied contract that confers vested rights to
    9
    Both Retired Employees and Youngman were decided in
    the context of local government employment. Their rationale
    would appear to apply as well to legislative enactments at the
    state level, but for present purposes it is sufficient for us to
    assume, without deciding, that application.
    18
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    health benefits on retired county employees.’ ” (Retired
    Employees, supra, 52 Cal.4th at p. 1176.) The county had
    entered into a series of express contracts with its employees, in
    the form of MOUs, relating to their terms and conditions of
    employment, but these agreements did not expressly address
    the retiree benefits for which the plaintiffs sought
    constitutional protection. Each of these MOUs had been
    ratified by a resolution of the board of supervisors. (Id. at pp.
    1177-1178.) We recognized the ordinary rule that public
    employment is a creature of statute, but we held that rule to be
    of “limited force” when “the parties are legally authorized to
    enter (and have in fact entered) into bilateral contracts to
    govern the employment relationship.” (Id. at p. 1182.) We
    ultimately “conclude[d] generally that legislation in California
    may be said to create contractual rights when the statutory
    language or circumstances accompanying its passage ‘clearly
    “. . . evince a legislative intent to create private rights of a
    contractual nature enforceable against the [governmental
    body].” ’ [Citations.] Although the intent to make a contract
    must be clear, our case law does not inexorably require that
    the intent be express. [Citation.] A contractual right can be
    implied from legislation in appropriate circumstances.
    [Citation.] Where, for example, the legislation is itself the
    ratification or approval of a contract, the intent to make a
    contract is clearly shown.” (Id. at p. 1187.) As the final
    sentence of that quotation suggests, the court found the
    existence of the MOUs critical to its conclusion that an implied
    contractual right could have been created. (Id. at p. 1183
    [“Where the relationship is governed by contract, a county may
    be bound by an implied contract (or by implied terms of a
    19
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    written contract), as long as there is no statutory prohibition
    against such an agreement”].)
    2. There is no indication that the Legislature intended
    to create a contractual right to purchase ARS
    credit
    Plaintiffs rely on Retired Employees, supra, 
    52 Cal.4th 1171
    , in arguing for a vested right in the opportunity to
    purchase ARS credit, characterizing that decision as finding a
    contractual right if the benefits “were promised when
    employees provided service.”
    Before addressing this argument, it is important to make
    clear what is not at issue here. The only change made by
    PEPRA relating to ARS credit was to eliminate the opportunity
    to purchase ARS credit after the end of 2012. PEPRA does not
    purport to affect the rights of employees who took advantage of
    the opportunity to purchase ARS credit while it was still
    available.    Persons who actually purchased ARS credit
    therefore remain in precisely the same position as they were
    prior to PEPRA, and we need not consider their circumstances
    further. What is claimed here to be a vested right is the
    opportunity to purchase ARS credit, rather than any of the
    rights conferred by its purchase.
    As discussed above, it was critical to Retired Employees’
    holding that the legislative enactment on which the implied
    contractual rights were premised was a resolution approving
    an express contract of employment. (Retired Employees, supra,
    52 Cal.4th at pp. 1183, 1187.) The county board’s ratification
    of this contract provided the requisite clear manifestation of
    intent to create contractual rights. Nothing of the sort
    occurred in connection with the opportunity to purchase ARS
    20
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    credit.    The Legislature did not engage in any sort of
    negotiation with the public employees covered by section
    20909, let alone ratify an express or implied contract reflecting
    its terms. The Legislature simply enacted a statute granting
    the opportunity to purchase ARS credit. As Retired Employees
    noted, such statutes, which announce a policy rather than
    create a contract, “ ‘are inherently subject to revision and
    repeal.’ ” (Retired Employees, supra, at p. 1185.)
    Plaintiffs’ characterization of ARS credit as “promised
    when employees provided service” suggests the existence of an
    affirmative commitment by the Legislature to make the
    opportunity to purchase ARS credit available indefinitely, but
    they cite no persuasive evidence of such a commitment.
    Plaintiffs rely primarily on a clause of section 20909, the
    statute conferring the opportunity to purchase ARS credit,
    which states that “[a] member may elect to receive this
    additional retirement service credit at any time prior to
    retirement by making the contributions as specified in Section
    21050 and 21052.” (Id. subd. (b).) They contend that this
    provision manifests the Legislature’s intent to permit existing
    employees to exercise the opportunity to purchase ARS credit
    at any point prior to their retirement by (1) working for the
    five-year period and (2) thereafter making the required
    payments to CalPERS. Although we recognize that the
    language, read in isolation, can be interpreted as plaintiffs
    urge, we agree with the trial court and Court of Appeal that
    this construction reads too much into subdivision (b).
    Rather than a commitment to maintain the opportunity
    to purchase ARS credit for the duration of the employment of
    existing public employees, this portion of subdivision (b), when
    21
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    read in the context of the remainder of section 20909, simply
    established that the one-time election to purchase ARS credit
    could be made at any point during an employee’s career and
    that the election to purchase was not complete until the
    required payments to the pension system had been made. (See
    Elks Hills Power, LLC v. Board of Equalization (2013) 
    57 Cal.4th 593
    , 610 [“ ‘ “[every] statute should be construed
    with reference to the whole system of law of which it is a part
    so that all may be harmonized and have effect” ’ ”].) The
    remaining provisions of section 20909 establish conditions
    applicable to the purchase of ARS credit — the requirement of
    written notice, the maximum number of years available for
    purchase, the minimum service time required before a
    purchase can be made, the requirement to purchase in whole-
    year increments, the limitation to one purchase event,
    restrictions on the applicability of ARS credit for non-pension
    purposes, and the type of employees eligible to make the
    purchase.10 (Id. subds. (a), (b), (d), (e).) It is therefore
    10
    The full text of section 20909 follows:
    “(a) A member who has at least five years of credited
    state service, may elect, by written notice filed with the board,
    to make contributions pursuant to this section and receive not
    less than one year, nor more than five years, in one-year
    increments, of additional retirement service credit in the
    retirement system.
    “(b) A member may elect to receive this additional
    retirement service credit at any time prior to retirement by
    making the contributions as specified in Sections 21050 and
    21052. A member may not elect additional retirement service
    credit under this section more than once.
    22
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    consistent with the statute’s remaining provisions to read the
    portion cited by plaintiffs as establishing other, similar
    conditions, specifying the time during an employee’s career
    when ARS credit can be purchased and the manner of
    completing that election. Given the existence of this more
    plausible reading, plaintiffs’ interpretation does not “clearly
    evince a legislative intent to create private rights of a
    contractual nature,” which is required before such rights will
    be found. (Retired Employees, supra, 52 Cal.4th at p. 1177; see
    id. at p. 1187 [“the intent to make a contract must be clear”].)
    As the Court of Appeal persuasively explained, “this phrase
    “(c) For purposes of this section, ‘additional retirement
    service credit’ means time that does not qualify as public
    service, military service, leave of absence, or any other time
    recognized for service credit by the retirement system.
    “(d) Additional retirement service credit elected pursuant
    to this section may not be counted to meet the minimum
    qualifications for service or disability retirement or for health
    care benefits, or any other benefits based upon years of service
    credited to the member.
    “(e) This section only applies to the following members:
    “(1) A member while he or she is employed in state
    service at the time of the additional retirement service credit
    election.
    “(2) A member of the system defined in Section 20324.
    “(f) For purposes of this section, ‘state service’ means
    service as defined in Section 20069.
    “(g) This section shall apply only to an application to
    purchase additional retirement credit that was received by the
    system prior to January 1, 2013, that is subsequently approved
    by the system.”
    23
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    means just what it says and no more — to wit, eligible
    employees could opt to purchase the service credit at any
    time,” rather than being required to purchase ARS credit at a
    particular point in their public careers. (Cal Fire, supra, 7
    Cal.App.5th at p. 127.) To convert “this straightforward
    reading of this statutory phrase [into a] promise by the
    Legislature not to modify or eliminate the option to purchase
    service credit” would fly in the face of “the legal presumption
    against the creation of a vested contractual right.” (Ibid.)
    Beyond this provision, plaintiffs have pointed to no text,
    legislative history, or other evidence suggesting that the
    Legislature intended to make ARS credit an irrevocable
    feature of the employment of then-existing public employees.11
    In arguing for an implied contract, plaintiffs rightly note
    that “[p]ension statutes have rarely, if ever, explicitly stated
    that a vested right is being created.” As discussed below, our
    cases holding that the pension rights of public employees are
    protected by the contract clause have done so even without a
    manifest indication of legislative intent. We have never held,
    however, that the constitutional protection afforded pension
    rights, which attaches even in the absence of manifest
    11
    In addition to citing section 20909, subdivision (b),
    plaintiffs contend that the Legislature should be presumed to
    have intended the creation of a contractual right in the
    opportunity to purchase ARS credit because the statute
    contains no affirmative indication that the opportunity was not
    contractual. The argument disregards the requirement of a
    clearly evinced legislative intent to create contractual rights in
    Retired Employees, supra, 52 Cal.4th at p. 1177.
    24
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    legislative intent to create contract rights, extends generally to
    all other benefits of public employment.
    C. Implied Contractual Rights
    Given the absence of circumstances clearly evincing a
    legislative intent to create a contractual right to purchase ARS
    credit, we turn to plaintiffs’ alternative argument that the
    opportunity to purchase ARS credit is entitled to the same type
    of constitutional protection as public employee pension rights.
    1. The Constitution protects an implied contractual
    right for California’s public employees to receive
    statutory pension benefits because those benefits
    constitute deferred compensation
    Our decisions recognize that, through his or her service,
    a public employee acquires a constitutionally protected implied
    contractual right to receive statutory pension benefits upon
    retirement.    “A public employee’s pension constitutes an
    element of compensation, and a vested contractual right to
    pension benefits accrues upon acceptance of employment.
    Such a pension right may not be destroyed, once vested,
    without impairing a contractual obligation of the employing
    public entity.” (Betts v. Board of Administration (1978) 
    21 Cal.3d 859
    , 863 (Betts).)
    The rationale for the constitutional protection of
    statutory pension rights was established over a century ago in
    O’Dea v. Cook (1917) 
    176 Cal. 659
     (O’Dea). The plaintiff in
    O’Dea was the widow of a San Francisco police officer who died
    as a result of injuries suffered in the line of duty. When she
    sought to claim her late husband’s pension benefits, which
    were created by the city charter (id. at p. 660), the trustees
    overseeing the pension plan refused her, citing an amendment
    25
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    to the plan that was enacted after the occurrence of her
    husband’s fatal injury but before his death.           O’Dea is
    recognized for rejecting the legal theory that public employee
    pensions constitute a gratuity, a legal argument that persisted
    well into the last century. (Monahan, supra, 97 Iowa L.Rev. at
    p. 1052; see Dodge v. Board of Education (1937) 
    302 U.S. 74
    , 79
    [affirming a state court finding of no vested right to a teacher
    pension created by statute and characterizing the benefits as
    “gratuities”].)   But O’Dea was also the first decision to
    articulate the legal foundation for our subsequent decisions
    finding a vested right to public employee pensions. In rejecting
    the gratuity theory, the court held, without further
    elaboration, “where, as here, services are rendered under . . . a
    pension statute, the pension provisions become a part of the
    contemplated compensation for those services and so in a sense
    a part of the contract of employment itself.” (O’Dea, at pp. 661-
    662, italics added.)
    Although O’Dea went no further in articulating a basis
    for the legal protection of pension rights, the connection to the
    constitutional contract clause was subsequently recognized by
    Kern v. City of Long Beach (1947) 
    29 Cal.2d 848
     (Kern). There
    we observed that our decisions following O’Dea had held that
    “the right to a pension vests upon acceptance of employment.”
    (Kern, at p. 852.) In reconciling this holding with the statutory
    nature of pension rights, Kern reasoned that the decisions “are
    not in conflict with language appearing in some cases to the
    general effect that public employment is not held by contract.
    [Citations.] . . . [P]ublic employment gives rise to certain
    obligations which are protected by the contract clause of the
    Constitution, including the right to the payment of salary
    26
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    which has been earned. Since a pension right is ‘an integral
    portion of contemplated compensation’ [citation], it cannot be
    destroyed, once it has vested, without impairing a contractual
    obligation. Thus the courts of this state have refused to hold,
    in the absence of special provision, that public employment
    establishes tenure rights, but have uniformly held that pension
    laws such as the [city charter provision at issue in Kern]
    establish contractual rights.” (Id. at pp. 852-853.)
    In justifying the constitutional protection given pension
    benefits, Kern did not rely on, or even inquire into,
    manifestations of legislative intent to confer contractual rights.
    Rather, the Kern court found that a contractual right to receive
    pension benefits is implied, despite their statutory foundation,
    because they constitute a form of deferred compensation. As
    Kern explained, a public employee “is not fully compensated
    upon receiving his salary payments because, in addition, he
    has then earned certain pension benefits, the payment of
    which is to be made at a future date. While payment of these
    benefits is deferred, and is subject to the condition that the
    employee continue to serve for the period required by the
    statute, the mere fact that performance is in whole or in part
    dependent upon certain contingencies does not prevent a
    contract from arising, and the employing governmental body
    may not deny or impair the contingent liability any more than
    it can refuse to make the salary payments which are
    immediately due.” (Kern, supra, 29 Cal.2d at p. 855.) Given
    their character as deferred compensation, the receipt of
    legislatively established pension benefits is protected by the
    contract clause, even in the absence of a manifest legislative
    intent to create contractual rights.
    27
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    Our subsequent decisions have confirmed that the receipt
    of pension benefits is granted constitutional protection because
    the benefits constitute a portion of the compensation awarded
    by the government to its employees, paid not at the time the
    services are performed but at a later time. As stated in Miller,
    supra, 
    18 Cal.3d 808
    , “Pension rights, unlike tenure of civil
    service employment, are deferred compensation earned
    immediately upon the performance of services for a public
    employer ‘[and] cannot be destroyed . . . without impairing a
    contractual obligation. Thus the courts of this state have
    refused to hold, in the absence of special provision, that public
    employment establishes tenure rights, but have uniformly held
    that pension laws . . . establish contractual rights.’ ” (Id. at pp.
    814; see also, White, 
    supra,
     30 Cal.4th at p. 564 [“public
    employment gives rise to certain obligations, protected by the
    contract clause of the Constitution”]; Legislature v. Eu (1991)
    
    54 Cal.3d 492
    , 533 [“Decisions of this court have assumed the
    federal contract clause protects the vested pension rights of
    public officers”].)12
    12
    Decisions outside California have characterized public
    employee pension plans as “an implied-in-fact unilateral
    contract” and justified their constitutional protection on this
    ground. (McGrath v. Rhode Island Retirement Bd. (1st Cir.
    1996) 
    88 F.3d 12
    , 17; see 
    ibid.
     [characterizing this view as
    “fairly well settled” and “applied repeatedly to state and
    municipal pension plans”]; see also Moro v. State (Or. 2015)
    
    351 P.3d 1
    , 20-21; Taylor v. City of Gadsden (11th Cir. 2014)
    
    767 F.3d 1124
    , 1134; State ex rel. Horvath v. State Teachers
    Retirement Bd. (Ohio 1998) 
    697 N.E.2d 644
    , 653-654;
    Christensen v. Minneapolis Municipal Employees Retirement
    Bd. (Minn. 1983) 
    331 N.W.2d 740
    , 747-748.) As explained in
    28
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    We have consistently recognized that elements of public
    employee compensation other than pension benefits also may
    be entitled to this type of implied contractual protection. In
    Kern, for example, we stated that “public employment gives
    rise to certain obligations which are protected by the contract
    clause of the Constitution, including the right to the payment
    of salary which has been earned.” (Kern, supra, 29 Cal.2d at p.
    853.) To the same effect, we stated in White, that “although
    the conditions of public employment generally are established
    by statute rather than by the terms of an ordinary contract,
    once a public employee has accepted employment and
    performed work for a public employer, the employee obtains
    certain rights arising from the legislative provisions that
    establish the terms of the employment relationship — rights
    that are protected by the contract clause of the state
    Constitution from elimination or repudiation by the state.”
    (White, supra, 30 Cal.4th at p. 566.) Our actual application of
    the contract clause to statutory terms and conditions of public
    employment outside the pension context, however, has been
    limited to the protection of earned salary (id. at pp. 565-566,
    570-571 [state employees are constitutionally entitled to
    receive compensation for work they have performed]) and the
    compensation “promised” to judges at the inception of their
    Hoefel v. Atlas Tack Corp. (1st Cir. 1978) 
    581 F.2d 1
    , “the
    modern view [is] that the promise of a pension constitutes an
    offer which, upon performance of the required service by the
    employee becomes a binding obligation.” (Id. at p. 4.) That
    view is consistent with the general approach, if not the express
    analysis, of our decisions.
    29
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    term of office. (Olson v. Cory (1980) 
    27 Cal.3d 532
    , 538-539
    (Olson) [state judges are entitled to receive compensation set
    by legislation at the beginning of their judicial term].)13
    2. The opportunity to purchase ARS credit was not a
    form of deferred compensation
    We first consider whether the opportunity to purchase
    ARS credit was a form of deferred compensation, in the nature
    of pension benefits, and entitled to contract clause protection
    on that basis.
    Pension benefits, the classic example of deferred
    compensation, flow directly from a public employee’s service,
    and their magnitude is roughly proportional to the time of that
    service. Just as each month of public service earns an
    employee a month’s cash compensation, it also earns him or
    her a slightly greater benefit upon retirement. In this way,
    pension benefits are, literally, earned by an employee’s work.
    Upon retirement, this additional component of his or her
    13
    Decisions of the Courts of Appeal have extended the
    principles developed in our pension cases to protect a wider
    range of public employment benefits. (E.g., California League
    of City Employee Associations v. Palos Verdes Library Dist.
    (1987) 
    87 Cal.App.3d 135
    , 137 (California League) [finding
    contract clause protection for terms and conditions of
    employment that constituted longevity benefits].) We have no
    occasion here to address the merits of that or similar decisions
    (see Retired Employees, supra, 52 Cal.4th at p. 1190 [accepting
    criticism of California League]), but we do not intend to
    suggest that implied contract clause protection is limited to the
    circumstances addressed in our own prior decisions.
    30
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    compensation is paid to the employee in the form of pension
    benefits.
    In contrast, the opportunity to purchase ARS credit,
    when it existed, was made available at the option of each
    individual employee.        If not taken advantage of, the
    opportunity expired upon an employee’s retirement or
    termination of employment. Further, the amount of an eligible
    employee’s service was entirely irrelevant to his or her exercise
    of the opportunity. Once the five-year qualification period was
    served, further public employment did not increase the amount
    of ARS credit that an employee could purchase or in any other
    way affect his or her opportunity. In contrast with pension
    benefits, in which a critical determinant is an employee’s term
    of public employment, the factor that determined the benefit
    received through the purchase of ARS credit was simply the
    number of years of ARS credit an employee purchased. And as
    noted, all vested employees, regardless of service time, had the
    same opportunity to purchase from one to five years of ARS
    credit. In fact, the opportunity to purchase ARS credit was so
    unconnected to actual service time that a public employee who
    had worked just the minimum of five years’ public employment
    and was otherwise eligible to retire could, at least in theory,
    have doubled his or her pension benefit by purchasing five
    years’ ARS credit and retiring soon after.
    Plaintiffs argue that it was necessary for employees to
    “earn,” in a sense, the right to purchase ARS credit by working
    in public employ for five years. (§ 20909, subd. (a).) We are
    not persuaded, however, that the imposition of this
    requirement created a constitutionally protected right. As the
    state points out, the five-year requirement was required to
    31
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    make section 20909’s authorization of ARS credit compliant
    with federal tax law, which limits the purchase of nonqualified
    service credit to persons who have participated in a pension
    plan for at least five years. (
    26 U.S.C. § 415
    (n)(3)(B)(ii).)
    Further, five years of service is generally required for an
    employee to qualify to receive a pension. (E.g., § 21060, subd.
    (a).) The five year requirement simply precluded the purchase
    of ARS credit by employees who had not yet established their
    eligibility for a pension. In light of these independent policy
    justifications for the existence of the requirement, we find no
    basis for concluding that the opportunity to purchase ARS
    credit was granted as deferred compensation for an employee’s
    work during the five-year period.
    The opportunity to purchase ARS credit was not different
    in form from a variety of other optional benefits offered to
    public employees in connection with their work. In addition to
    their salary or hourly pay, it is not unusual for public
    employees to be offered the opportunity to purchase different
    types of health insurance benefits from a variety of providers;
    to purchase life and long-term disability insurance; and to
    create a flexible spending account, by which certain medical
    and child care expenses can be paid with pre-tax income. We
    have never suggested that this type of benefit is entitled to
    protection under the contract clause.
    32
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    3. There is no other basis to find implied contract
    clause protection for the opportunity to purchase
    ARS credit
    a. Even if viewed as an offer of a unilateral
    contract, section 20909 was properly revoked by
    the Legislature
    Plaintiffs argue that opportunity to purchase optional
    benefits such as these is protected by the contract clause
    because it constitutes “an offer of a unilateral contract term for
    which performance is tendered by beginning and continuing
    employment.”      Except under the circumstances discussed
    above, statutory terms and conditions of public employment do
    not create contractual rights. (Miller, supra, 18 Cal.3d at
    pp. 813-814.) Yet even if we treat section 20909 as constituting
    an offer of a unilateral contract, the offer was revocable until
    accepted by the actual purchase of ARS credit; it did not
    require the state to make the opportunity to purchase ARS
    credit available for the duration of the careers of existing
    employees.
    A unilateral contract is one that is accepted by
    performance. (Davis v. Jacoby (1934) 
    1 Cal.2d 370
    , 378-379;
    Los Angeles Traction Co. v. Wilshire (1902) 
    135 Cal. 654
    , 658 [a
    unilateral contract is “a mere offer that, if subsequently
    accepted and acted upon by the other party to it, would ripen
    into a binding, enforceable obligation”]; Civ. Code, § 1584.)
    Under ordinary principles of contract law, such an offer can be
    revoked or modified prior to acceptance — in other words, prior
    to the promisee’s performance of the act constituting
    performance. (T.M. Cobb Co. v. Superior Court (1984) 
    36 Cal.3d 273
    , 278; Civ. Code, § 1586; 1 Witkin, Summary of Cal.
    Law (10th ed. 2005) Contracts, §§ 166-167, pp. 202-204.)
    33
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    Under section 20909, to accept the “offer” to purchase
    ARS credit, a public employee must (1) file a written election
    with the employee’s pension board (id. subd. (a)) and (2) make
    appropriate payments to the retirement system (id. subd. (b)).
    Accordingly, even if section 20909 were treated as establishing
    the offer of a unilateral contract, the Legislature was entitled
    to revoke that offer as to all public employees who had yet to
    make a written election and the required payments. In
    PEPRA, the Legislature did just that.
    Plaintiffs argue that engaging in public employment was
    sufficient to prevent revocation of the section 20909 offer
    because an offeror’s right to revoke or modify a unilateral
    contract ends once partial performance occurs. (State of
    California v. Agostini (1956) 
    139 Cal.App.2d 909
    , 914 [“ ‘If an
    offer for a unilateral contract is made, and part of the
    consideration requested in the offer is given or tendered by the
    offeree in response thereto, the offeror is bound by a
    contract’ ”].) We disagree, however, with the premise of their
    argument, that public employment constituted partial
    consideration for the acquisition of ARS credit.            The
    opportunity to purchase ARS credit was conditioned on public
    employment, but it was not offered in exchange for public
    service. For those employees who had already been publicly
    employed for five years at the time section 20909 was enacted
    in 2003, no public service was required to qualify for an
    election to purchase ARS credit. Such employees’ mere status
    as public employees on the effective date was sufficient. Once
    other public employees had served the five years necessary to
    qualify to receive a pension, they were also qualified for full
    rights under section 20909.        Although continuing public
    34
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    employment was necessary to retain the qualification to make
    an election, that continuing service did not bring an employee
    any closer to acquiring ARS credit. Performance — the
    consideration for the acquisition of ARS credit — required the
    filing of a written election and payment of the necessary sums.
    Our conclusion in this regard is bolstered by the
    requirement in section 21052, which sets the terms of payment
    for ARS credit, that an employee contribute the full amount of
    “the increase in employer liability” in order to acquire ARS
    credit. (Id.) An employee’s public service appears not to have
    been viewed by the Legislature as constituting partial
    consideration for an election under section 20909, since the
    employee received no offsetting credit for the value of that
    service in purchasing ARS credit.
    In this regard, plaintiffs argue that a contractual right
    with respect to the opportunity to purchase ARS credit should
    be found because public employees reasonably expected that
    the opportunity would continue to be made available for the
    duration of their employment. The only cited basis for those
    “reasonable expectations,” however, is the belief that the
    opportunity to purchase ARS credit would continue to exist in
    the future because it “was in effect for ten years.” The
    argument proves too much. We have never held that statutory
    terms and conditions of public employment gain constitutional
    protection merely from the fact of their existence, even if they
    have persisted for a decade.14 Such a rationale would directly
    14
    In one prior decision, Betts, supra, 
    21 Cal.3d 859
    , we
    suggested that public employees’ “contractual pension
    35
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    contradict the general principle that such terms and conditions
    are not a matter of contract and are generally subject to
    legislative change. (Miller, supra, 18 Cal.3d at pp. 813-814;
    Butterworth, supra, 12 Cal.2d at p. 150.)
    b. The opportunity to purchase ARS credit was not
    entitled to constitutional protection solely
    because it involved the pension system
    Plaintiffs also argue that the opportunity to purchase
    ARS credit was protected by the contract clause because it was
    a “pension right,” enacted as part of the public employee
    retirement law and implemented through the pension system.
    As plaintiffs phrase it, the opportunity to purchase ARS credit
    constituted a vested right because, if an employee exercised
    that opportunity, “it increased the pension benefit.” We have
    never held, however, that a particular term or condition of
    public employment is constitutionally protected solely because
    it affects in some manner the amount of a pensioner’s benefit.
    Our decision in Miller, supra, 
    18 Cal.3d 808
    , is
    illustrative. The plaintiff in Miller was a state tax attorney
    who was forced to retire upon reaching the age of 67, the
    expectations” were relevant to determining the extent of their
    vested pension rights. (Id. at p. 866; see similarly, Bellus v.
    Eureka (1968) 
    69 Cal.2d 336
    , 341, 350 [employee expectations
    relevant to interpreting terms of pension plan].) It is one thing
    to consider employees’ expectations in determining the extent
    of protected rights. It is a different matter, and simply
    circular, to consider employees’ expectations in determining
    whether a particular benefit is protected at all, at least when
    those expectations are based solely on the existence of the
    benefit.
    36
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    statutory age of mandatory retirement from state service. At
    the time he began his state employment, and until a few years
    before his retirement, the mandatory age of retirement was 70,
    and the plaintiff’s pension benefit would have been less if he
    was required to abide by the lower retirement age. (Id. 18
    Cal.3d at p. 811.) Despite the impact on the plaintiff’s pension
    benefit, we declined to hold that he had a vested right to retire
    according to the mandatory age in effect at the time he joined
    state service. (Id. at pp. 812, 815-817.)
    We began our discussion by reiterating the familiar
    principle that public employment in California is a creature of
    statute, not contract, and “no employee has a vested
    contractual right to continue in employment beyond the time
    or contrary to the terms and conditions fixed by law.” (Miller,
    supra, 18 Cal.3d at p. 813.) “In view of these long and well
    settled principles,” we concluded “that the power of the
    Legislature to reduce the tenure of plaintiff’s civil service
    position . . . by changing the mandatory retirement age was not
    and could not be limited by any contractual obligation.” (Id. at
    p. 814.) We distinguished cases involving pension rights,
    explaining that pension rights, “unlike tenure of civil service
    employment,” are “deferred compensation” and therefore
    protected by the contract clause. (Ibid.)
    We then turned to a second question, whether the impact
    of the legislation on the plaintiff’s pension benefits
    “nevertheless work[ed] an impairment of any vested right to
    earn a larger monthly pension based upon continued state
    service until age 70.” (Miller, supra, 18 Cal.3d at p. 815.)
    Drawing on decisions holding that “the right to pension
    benefits vests upon the acceptance of employment,” the
    37
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    plaintiff contended that “upon acceptance of public
    employment [he] acquired a vested right to a pension based on
    the system then in effect,” which allowed him to earn
    maximum benefits by working to age 70. (Id. at pp. 815, 817.)
    We rejected the argument because the plaintiff had failed to
    satisfy the prerequisite for maximum benefits, that he work
    until age 70.      Although we recognized that it was the
    legislative enactment that mandated his retirement before he
    reached the age of 70, we found no vested right to achieve the
    maximum pension benefit because, as discussed above,
    “plaintiff had no vested contractual right to continue working
    for any specified period of time.” (Id. at p. 817.) “In short, [the
    plaintiff’s] membership in [the state retirement system] did not
    confer on him the right to remain in state employment beyond
    age 67 and he had no constitutionally protected right to
    continue in his position until age 70 in order to receive a larger
    retirement allowance. . . . [¶] [T]he power of the Legislature,
    unfettered by contract, reduced the mandatory age of
    retirement and thereby created the condition subsequent
    whose occurrence not only terminated plaintiff’s employment
    but also defeated his expectation of additional salary and a
    larger retirement allowance.” (Ibid.)
    A second decision illustrating the same principle is
    Creighton v. Regents of University of California (1997) 
    58 Cal.App.4th 237
     (Creighton), which involved an early
    retirement program implemented to cope with budget cuts at a
    university laboratory. Eligible employees, who were covered
    by a defined benefit pension plan, were given a three-month
    period to decide whether to accept immediate retirement in
    return for an additional five years of service credit. When, two
    38
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    weeks into the three-month period, administrators concluded
    that the program was too generous, they reduced the offer to
    an additional three years of service credit for persons who had
    not yet accepted the offer. This change naturally reduced the
    size of the pension benefits available to employees who took
    advantage of the program. (Id. at p. 241.) The plaintiffs, who
    accepted early retirement after the reduction of the offer, sued
    to obtain the benefit of the original proposal, contending that
    because the program concerned their pension plan they had a
    vested right to the terms of the original proposal. (Id. at p.
    242.)
    The Court of Appeal rejected the claim. The court
    accepted that the program constituted a “retirement benefit,”
    thereby distinguishing it from other types of compensation, but
    it held that the program was “different in kind from the
    benefits governed by the [line of cases granting constitutional
    protection to pension benefits], none of which concerned a one-
    time, special, elective incentive offered to eligible employees
    during a short, specified ‘window’ period, in response to specific
    financial exigencies.” (Creighton, supra, 58 Cal.App.4th at pp.
    243-244, fn. omitted.) The document governing the early
    retirement program expressly stated that it “ ‘shall not be a
    vested or accrued Plan benefit.’ ” (Id. at p. 244.) Based on that
    provision, the court had “no difficulty in concluding that the
    language . . . clearly and unambiguously means that [the
    program] creates no vested right to either its additional age
    and service credits or the resulting enhanced pension
    payments.” (Ibid.) “Rather,” the court held, “it is a limited
    offer of enhanced benefits which, upon an eligible employee’s
    39
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    timely acceptance . . . , and with consideration . . . , creates a
    separate binding contract.” (Id. at p. 245.)
    As Miller and Creighton demonstrate, a term and
    condition of public employment that is otherwise not entitled to
    protection under the contract clause does not become entitled
    to such protection merely because it affects the amount of an
    employee’s pension benefit.        In any event, although the
    purchase of ARS credit does increase the amount of a pension
    benefit, as plaintiffs argue, it does not affect the amount of the
    pension benefit that represents deferred compensation. That
    portion of the pension benefit is the same for employees who
    elect to purchase ARS credit and those with the identical
    employment experience who decline to purchase it. Acquiring
    ARS credit merely adds an amount attributable to the
    purchased service credit to the monthly benefit payable as
    deferred compensation. Rather than compensation for public
    employment, the increase in pension benefits from the
    purchase of ARS credit is a return of, and perhaps a return on,
    the funds used to make the purchase.
    Plaintiffs cite Wilson, supra, 
    52 Cal.App.4th 1109
    , in
    support of their position, arguing the decision rejected a
    distinction between “pension benefits” and “pension rights.”
    Wilson addressed the constitutionality of a change in the
    manner in which the state made its contributions to the state
    pension fund, from funding on a current basis to funding a year
    in arrears. (Id. at pp. 1117-1118.) In the process, the court
    rightly rejected the state’s argument that the vested rights
    doctrine applies only to changes in pension benefits, as opposed
    to changes in other aspects of the pension system. As the court
    noted, the doctrine applies to the “modification of any ‘vested
    40
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    contractual pension right,’ ” which prior decisions had held to
    include the manner of pension funding. (Id. at p. 1145.)
    Although Wilson rightly held that “ ‘vested contractual pension
    right[s]’ ” encompass more than the benefits paid by a pension
    system, it did not attempt to define the scope of such rights,
    beyond the funding mechanism actually addressed in the
    decision. For the reasons stated above, we conclude that the
    opportunity to purchase ARS credit was not a vested
    contractual pension right.
    c. The opportunity to purchase ARS credit is not
    entitled to constitutional protection under
    Olson v. Cory
    We held in Olson, supra, 
    27 Cal.3d 532
    , that state judges
    are entitled under the contract clause to receive, for the
    duration of their term, the compensation established by statute
    for their position at the outset of their term, characterizing this
    as “[p]romised compensation.” (Id. at p. 538.) The plaintiffs in
    Olson were a group of current and former California judges
    who challenged an amendment to the statute governing
    judicial compensation that reduced their cost-of-living
    increases. As a result of the legislation, judges would receive a
    five percent salary increase, rather than the fractionally
    greater increase that would have been available prior to the
    amendment. (Id. at pp. 536-537.) Olson found the legislation
    unconstitutional on two independent grounds: (1) the statute
    violated our Constitution’s prohibition against the reduction of
    an elected state officer’s salary during his or her term of office
    (id. at pp. 537, fn. 2 & 543-544; see Cal. Const., art. III, § 4);
    and (2) the statute violated judicial officers’ vested rights
    under the contract clause.
    41
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    Our consideration of the contract clause issue began by
    acknowledging the case law holding that public employment “is
    not held by contract and therefore is not protected by the
    contract clause.” (Olson, supra, 27 Cal.3d at p. 537.) We
    distinguished those decisions, however, on the grounds that
    the matter at hand concerned “the right to compensation by
    persons serving their term of public office to which they have
    undisputed rights.” (Id. at p. 538.) We found the situation
    analogous to the circumstances in Sonoma County
    Organization of Public Employees v. County of Sonoma (1979)
    
    23 Cal.3d 296
     (Sonoma County), which held that a state
    statute reducing public employee cost-of-living increases
    embodied in a memorandum of understanding ran afoul of the
    contract clause. (Id. at pp. 302-303, 313-314.) Characterizing
    “the elements of compensation for [public] office” to be
    “contractually vested upon acceptance of employment,” Olson
    held that the contract clause precludes the Legislature, during
    the term of a judicial officer, from reducing the benefits
    available at the commencement of his or her term. (Olson,
    supra, 27 Cal.3d at pp. 538, fn. 3 & 539.) We recognized that if
    a judge chose to enter a new term of office after the effective
    date of the challenged legislation, he or she would be subject to
    the reduced compensation established there. (Id. at p. 540.)
    Olson does not support plaintiffs’ claim of a vested right
    to purchase ARS credit. First, critical to Olson’s reasoning was
    the defined term of office served by judicial officers. (See
    Olson, supra, 27 Cal.3d at p. 538, fn. 3 [distinguishing
    Millholen v. Riley (1930) 
    211 Cal. 29
    , because it concerned a
    public employee whose employment “apparently could be
    terminated at will”].) Olson treated the statutory employment
    42
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    benefits available to a judge at the beginning of his or her term
    as, in effect, a contract for the length of the term, and its ruling
    was effective only for the duration of a judge’s term. The
    decision anticipated that upon entering into a new term,
    judges would be subject to the statutory terms and conditions
    of employment then in effect. (Id. at p. 540.) Plaintiffs and the
    other employees affected by PEPRA’s elimination of the
    opportunity to purchase ARS credit do not have discrete terms
    of service. They claim an open-ended entitlement to ARS
    credit for the duration of their public careers. Second, Olson
    relied on the central role played by monetary compensation in
    the employment decision. As the court noted, “[a] judge
    entering office is deemed to do so in consideration of — at least
    in part — salary benefits then offered by the state for that
    office.” (Id. at p. 539.) Compared to salary benefits, the
    subject of Olson, the opportunity to purchase ARS credit was a
    minor part of the benefits available to public employees.
    Although it might have been a desirable optional benefit for
    some employees, its significance was likely minimal in
    comparison to salary, vacation, health care, and pension
    benefits. Even if Olson were to be applied outside the context
    of state officers serving for a fixed term, we would be unwilling
    to extend its holding to all of the terms and conditions of a
    public employee’s employment, without regard to the
    significance of those benefits. As discussed above, we have
    never held that the terms and conditions of public employment
    are protected by the contract clause merely because of their
    existence. If Olson were applied to protect a relatively minor
    benefit, such as the opportunity to purchase ARS credit, there
    would be little left of that principle.
    43
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
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    Opinion of the Court by Cantil-Sakauye, C. J.
    d. A legal opinion expressed by CalPERS did not
    create contractual rights
    As a final note, plaintiffs argued in the courts below that
    the opportunity to purchase ARS credit should be found a
    vested right because CalPERS once characterized it as such in
    a publication. (CalPERS, Vested Rights of CalPERS Members:
    Protecting the Pension Promises Made to Public Employees
    (July 2011).) The publication presented this conclusion as the
    result of “[CalPERS’s] understanding of the current state of
    vested rights law in California.” (Id. at p. 13.) Plaintiffs do not
    explicitly repeat their argument in this court, but they cite the
    CalPERS publication occasionally in their briefs as supporting
    the protected nature of ARS credit rights. Whether the
    opportunity to purchase ARS credit is a constitutionally
    protected right is an issue of constitutional law, not pension
    law. With due respect to CalPERS, its interpretations of the
    state Constitution are not entitled to the same deference as its
    interpretations of California’s pension laws.          (See, e.g.,
    Yamaha Corp. of America v. State Bd. of Equalization (1998)
    
    19 Cal.4th 1
    , 12 [agency entitled to deference when
    interpreting statutes and regulations within its “ ‘expertise
    and technical knowledge’ ”].)
    III. DISPOSITION
    The state and many amici curiae have urged us to use
    this decision as an occasion to re-examine the California Rule,
    the doctrine developed in our prior decisions defining the scope
    of constitutional protection afforded pension rights. Our
    holding that the opportunity to purchase ARS credit is not a
    vested right precludes such a re-examination. Underlying the
    California Rule is the constitutional contract clause, which
    44
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Opinion of the Court by Cantil-Sakauye, C. J.
    prohibits state laws that impair contractual obligations.
    Because we conclude that California’s public employees have
    never had a contractual right to the continued availability of
    the opportunity to purchase ARS credit, the question of
    whether PEPRA worked an unconstitutional impairment of
    protected rights does not arise. Necessarily, if there was no
    contractual right to ARS credit in the first place, a law
    eliminating ARS credit could not have impaired a contractual
    right. Our decision in this matter therefore expresses no
    opinion on the various issues raised by the state and amici
    curiae relating to the scope of the California Rule.
    For the reasons stated above, we affirm the decision of
    the Court of Appeal.
    CANTIL-SAKAUYE, C. J.
    We Concur:
    CHIN, J.
    CORRIGAN, J.
    LIU, J.
    CUÉLLAR, J.
    KRUGER, J.
    ZELON, J.*
    ________________________
    *
    Associate Justice of the Court of Appeal, Second
    Appellate District, Division Seven, assigned by the Chief
    Justice pursuant to article VI, section 6 of the California
    Constitution.
    45
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC
    EMPLOYEES’ RETIREMENT SYSTEM
    S239958
    Concurring Opinion by Justice Kruger
    I concur in the majority opinion, which I have signed. I
    write separately to expand briefly on a key element of the
    analysis:    why the opportunity to purchase additional
    retirement service (ARS) credits was not an employment
    benefit that vested by implication, as were the pension benefits
    at issue in Betts v. Board of Administration (1978) 
    21 Cal.3d 859
    , Kern v. City of Long Beach (1947) 
    29 Cal.2d 848
    , and
    similar cases.
    Our cases concerning the vesting of public employee
    pension rights are most easily understood through the lens of
    ordinary contract law principles. Under those principles, an
    implied-in-fact unilateral contract can arise from the
    government’s offer of an employment benefit in exchange for
    the public employee’s acceptance by entering into or continuing
    in public service. When the benefit is one that will be provided
    only in the future—like a pension—the formation of such a
    contract vests the right to that benefit, making the
    government’s offer irrevocable as to employees who have
    worked for the deferred benefit and earned it as part of the
    employment bargain. (Maj. opn., ante, at p. 28, fn. 12; Betts v.
    Board of Administration, supra, 21 Cal.3d at p. 863; Kern v.
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Kruger, J., concurring
    City of Long Beach, supra, 29 Cal.2d at pp. 851–852, 855; see
    McGrath v. Rhode Island Retirement Bd., etc. (1st Cir. 1996) 
    88 F.3d 12
    , 16–17; Moro v. State (Or. 2015) 
    351 P.3d 1
    , 20–22.)1
    Of course, not every statute or ordinance providing an
    employment benefit (or even every aspect of a statutory
    pension program) constitutes an implied offer for a unilateral
    contract, and thus not every future benefit is the subject of a
    vested right; if that were so, the implied-right exception would
    swallow the general rule that the terms and conditions of
    public employment are set by statute rather than contract.
    (Maj. opn., ante, at pp. 16, 35–36.) Our cases have treated
    deferred compensation programs, such as pension plans, as
    special in this regard. An understanding of why these
    programs create implied vested rights is important to our
    understanding of why the particular program at issue here
    does not.
    Deferred compensation programs provide a particularly
    clear case for formation of an implied unilateral contract.
    1
    We often ask whether a statute creates implied vested
    rights, but when the terms of a pension plan are set by statute
    for all public employers participating in the plan, it is the
    employer’s offer of employment subject to the plan, rather than
    the statute itself, that constitutes the contractual offer. (See
    Moro v. State, supra, 351 P.3d at p. 21 [“Although the [Public
    Employee Retirement System] contract results from an offer
    and acceptance, the PERS statutes are themselves not an offer
    that employees can accept.         Instead, each participating
    employer offers a promise to its employees to provide
    compensation, including PERS benefits, in exchange for the
    employees’ services.”].)
    2
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Kruger, J., concurring
    Monetary compensation, whether received periodically for
    work performed during the period or deferred until retirement
    in the form of a pension benefit, is the central consideration for
    which public employees, like other workers, enter and continue
    in employment. An implied contractual promise protecting
    this type of pension right arises because neither party could
    reasonably understand a deferred compensation offer to be
    revocable at will after employment. (See Brant v. California
    Dairies, Inc. (1935) 
    4 Cal.2d 128
    , 133 [intent of contractual
    parties determined objectively from their words and conduct];
    Meyer v. Benko (1976) 
    55 Cal.App.3d 937
    , 942–943 [mutual
    assent to contract determined by “what the outward
    manifestations of consent would lead a reasonable person to
    believe”]; 1 Witkin, Summary of Cal. Law (11th ed. 2017)
    Contracts, § 767, p. 821.) No reasonable employee would agree
    to defer significant portions of his or her compensation without
    a vesting guarantee, and no reasonable employer would
    imagine that employees had agreed to work on such terms.
    None of this is true of the opportunity to purchase ARS
    credits provided by Government Code section 20909. For
    reasons the majority opinion discusses, the parties could not
    reasonably have understood that opportunity as an offer that
    could be accepted simply by employment in a participating
    California Public Employees’ Retirement System agency. (Maj.
    opn., ante, at pp. 34–35.) Among other things, no new service
    was required of public employees who had already served five
    years when section 20909 was enacted (a period corresponding
    to the general pension vesting period and to the requirements
    of federal tax law) and purchasers had to pay the full
    estimated value of the additional credits under Government
    3
    CAL FIRE LOCAL 2881 v. CALIFORNIA PUBLIC EMPLOYEES’
    RETIREMENT SYSTEM
    Kruger, J., concurring
    Code sections 20909 and 21052. Objectively speaking, a party
    looking at this arrangement would understand that the ARS
    purchase option was not offered in exchange for any period of
    public service but rather in exchange for the statutorily
    mandated purchase price. (See Foley v. Interactive Data Corp.
    (1988) 
    47 Cal.3d 654
    , 677–678 [parties’ intent to agree on
    implied contractual terms is determined from their conduct];
    Rest.2d Contracts, §§ 19, 30, com. d, p. 86, 71, com. b, p. 173
    [terms of offer and acceptance governed by objective
    manifestations of assent].) The offer was one that could be
    accepted only by the employee’s election and actual purchase of
    ARS credits, not simply by staying on the job.
    For these reasons, I agree with the majority: No implied
    unilateral contract arose simply from an employee’s entering
    or continuing in public service during the period the ARS
    program was in force. As a consequence, the contract clause of
    the California Constitution did not protect the right to
    purchase ARS credits from later alteration or revocation.
    KRUGER, J.
    I Concur:
    LIU, J.
    4
    See last page for addresses and telephone numbers for counsel who argued in Supreme Court.
    Name of Opinion Cal Fire Local 2881 v. California Public Employees’ Retirement System
    __________________________________________________________________________________
    Unpublished Opinion
    Original Appeal
    Original Proceeding
    Review Granted XXX 
    7 Cal.App.5th 115
    Rehearing Granted
    __________________________________________________________________________________
    Opinion No. S239958
    Date Filed: March 4, 2019
    __________________________________________________________________________________
    Court: Superior
    County: Alameda
    Judge: Evelio M. Grillo
    __________________________________________________________________________________
    Counsel:
    Carroll, Burdick & McDonough, Messing Adam & Jasmine, Gary M. Messing, Gregg McLean Adam,
    Jason H. Jasmine and Yonatan L. Moskowitz for Plaintifffs and Appellants.
    Olson, Hagel & Fishburn, Christopher W. Waddell, Lance H. Olson, Deborah B. Caplan and Richard C.
    Miadich for Californians for Retirement Security as Amicus Curiae on behalf of Plaintifffs and Appellants.
    Silver, Hadden, Silver and Levine, Stephen H. Silver and Jacob A. Kalinski for Ventura County
    Professional Fire Fighters Association as Amicus Curiae on behalf of Plaintifffs and Appellants.
    Mastagni Holstedt, David E. Mastagni, Isaac S. Sevens, Jeffrey R.A. Edwards and Erich A. Knorr for Lake
    County Correctional Officers’ Association, Mendocino County Deputy Sheriffs’ Association, Merced City
    Firefighters, International Association of Firefighters, Local 1479, AFL-CIO, Napa City Firefighters
    Association, International Association of Fire Fighters, Local 3124, AFL-CIO, Palo Alto Firefighters,
    International Association of Fire Fighters, Local 1319, AFL-CIO, Sacramento Area Firefighters,
    International Association of Firefighters, Local 522, AFL-CIO, Santa Clara County Correctional Officers
    Association, Deputy Sheriffs’ Association of Alameda County, El Dorado County Deputy Sheriff’s
    Association, Ontario Police Officers’ Association, Sacramento Police Officers Association and Sacramento
    County Deputy Sheriff’s Association as Amici Curiae on behalf of Plaintifffs and Appellants.
    Leonard Carder, Peter W. Saltzman, Kate Hallward and Arthur Liou for Amalgamated Transit Union Local
    1225, Amalgamated Transit Union Local 1555, International Brotherhood of Electrical Workers Local
    1245, International Federation of Professional and Technical Engineers Local 21, Marin Association of
    Public Employees, Operating Engineers Local Union No. 3 and Physicians’ and Dentists’ Organization of
    Contra Costa as Amici Curiae on behalf of Plaintifffs and Appellants.
    Page 2 – S239958 – counsel continued
    Counsel:
    Rains Lucia Stern St. Phalle & Silver, Stephen H. Silver and Timothy K. Talbot for Los Angeles Police
    Protective League, Ventura County Deputy Sheriffs’ Association, California Association of Highway
    Patrol, Garden Grove Police Association, California Statewide Law Enforcement Association, Orange
    County Employees’ Association, Los Angeles County Professional Peace Officers’ Association,
    Association for Los Angeles Deputy Sheriffs, Deputy Sheriffs’ Association of Santa Clara, Fresno Deputy
    Sheriffs’ Association, Coalition of Santa Monica City Employees and Antioch Police Officers’ Association
    as Amici Curiae on behalf of Plaintifffs and Appellants.
    Reich, Adell & Cvitan, Marianne Reinhold, Laurence S. Zakson and Aaron G. Lawrence for Orange
    County Attorneys Association and Orange County Mangers Association as Amici Curiae on behalf of
    Plaintifffs and Appellants.
    Rothner, Segall & Greenstone and Glenn Rothner for American Federation of State, County and Municipal
    Employees, American Federation of Teachers, National Education Association, Service Employees
    International Union, California Faculty Association, California Federation of Teachers and California
    Teachers Association as Amici Curiae on behalf of Plaintifffs and Appellants.
    Matthew G. Jacobs, Wesley E. Kennedy and Preet Kaur for Defendant and Respondent.
    Brian J. Bartow and Scott S. Brooks for California State Teachers’ Retirement System as Amicus Curiae on
    behalf of Defendant and Respondent.
    Jonathan M. Coupal; Benbrook Law Group, Bradley A. Benbrook and Stephen M. Duvernay for Howard
    Jarvis Taxpayers Association and Ventura County Taxpayers Association as Amici Curiae on behalf of
    Defendant and Respondent.
    Kamala D. Harris and Xavier Becerra, Attorneys General, Douglas J. Woods and Thomas S. Patterson,
    Assistant Attorneys General, Tamar Pachter and Nelson Ryan Richards, Deputy Attorneys General; Peter
    A. Krause and Rei R. Onishi for Intervener and Respondent.
    Atkinson, Andelson, Loya Ruud & Romo, Anthony P. De Marco and Joshua E. Morrison for Association
    of California School Adminstrators as Amicus Curiae on behalf of Intervener and Respondent.
    Jones Day, Beth Heifetz, G. Ryan Snyder and Karen P. Hewitt for California Business Roundtable as
    Amicus Curiae on behalf of Intervener and Respondent.
    Renne Sloan Holtzman Sakai, Jonathan Holtzman and Linda M. Ross for League of California Cities as
    Amicus Curiae on behalf of Intervener and Respondent.
    Bruce D. Goldstein, County Counsel (Sonoma), Debbie F. Latham, Chief Deputy County Counsel; and
    Dennis Bunting, County Counsel (Solano) for County of Sonoma and County of Solano as Amici Curiae on
    behalf of Intervener and Respondent.
    Lounsbery Ferguson Altona & Peak, Kenneth H. Lounsbery, James P. Lough and Alena Shamos for City of
    Pacific Grove as Amicus Curiae on behalf of Intervener and Respondent.
    Page 3 – S239958 – counsel continued
    Counsel:
    Gibson, Dunn & Crutcher, Daniel M. Kolkey, Perlette Michèle Jura, Theodore M. Kider and Samuel D.
    Eisenberg for Pacific Research Institute as Amicus Curiae on behalf of Intervener and Respondent.
    Greines, Martin, Stein & Richland and Timothy T. Coates for Los Angeles County Employees Retirement
    Association as Amicus Curiae.
    Counsel who argued in Supreme Court (not intended for publication with opinion):
    Greg McLean Adam
    Messing Adam & Jasmine
    235 Montgomery Street, Suite 828
    San Francisco, CA 94104
    (415) 266-1800
    Rei R. Onishi
    Deputy Legal Affairs Secretary
    Office of Governor Edmund G. Brown, Jr.
    State Capitol, Suite 1173
    Sacramento, CA 95814
    (916) 445-0873