Christensen v. Christensen , 2017 Utah App. LEXIS 120 ( 2017 )


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    2017 UT App 120
    THE UTAH COURT OF APPEALS
    ELENA KAY CHRISTENSEN,
    Appellee,
    v.
    BRENT CHRISTENSEN,
    Appellant.
    Opinion
    No. 20150994-CA
    Filed July 20, 2017
    Second District Court, Ogden Department
    The Honorable Ernest W. Jones
    No. 094901718
    Randall W. Richards, Attorney for Appellant
    Elena Kay Christensen, Appellee Pro Se
    JUDGE J. FREDERIC VOROS JR. authored this Opinion, in which
    JUDGES KATE A. TOOMEY and DAVID N. MORTENSEN concurred.
    VOROS, Judge:
    ¶1     Brent Christensen and Elena Kay Christensen (now Elena
    Watts) divorced in 2012. 1 Brent has since retired and Elena has
    shared a residence with another man. Based on these and other
    factors, Brent filed a petition to modify his child support and
    alimony obligations. The trial court ruled that Elena was not
    cohabiting and thus refused to terminate alimony. The court also
    reduced the alimony payment, but prospectively only; refused to
    modify child support; and awarded Elena a money judgment for
    1. In cases where the parties shared a last name, our practice is to
    refer to them by their first name, with this court intending no
    disrespect by the apparent informality. Earhart v. Earhart, 
    2015 UT App 308
    , ¶ 2 n.1, 
    365 P.3d 719
    .
    Christensen v. Christensen
    arrearages. Because the court considered a legally irrelevant
    factor in determining cohabitation, we remand for further
    findings on that question. In all other respects, we affirm.
    BACKGROUND
    ¶2     Brent and Elena divorced in October 2012. The trial court
    awarded the parties joint legal and physical custody of their four
    children. At the time of the divorce, Brent was employed as a
    school teacher with a monthly income of $4,749.15. Elena had
    stayed at home to care for the children during the marriage, but
    the court found her capable of employment and imputed to her a
    monthly income of $1,365. The court ordered Brent to pay $1,200
    per month in alimony and $548 per month in child support.
    When Brent retired in September 2014, he stopped paying
    alimony and child support, and Elena began receiving about
    $800 per month as a share of his pension.
    ¶3     The following year Brent filed a petition to modify
    alimony and child support. He sought to terminate alimony on
    the ground that Elena was cohabiting with her boyfriend. He
    also claimed a material change in his income due to retirement.
    Specifically, he maintained that he was unable to work due to
    stress from the divorce and was thereby forced to retire. He
    asserted that he had a constitutional right to retire, as friends his
    age had done, and that he wanted to be a stay-at-home parent. In
    response, Elena sought an award of unpaid alimony and child
    support. 2
    2. Brent had previously filed a petition for an order to show
    cause for Elena’s failure to pay her portion of the children’s
    health insurance premiums and had obtained a judgment
    against her for $1,674.90. Elena requests that we vacate the
    $1,674.90 judgment against her for insurance premium arrears.
    (continued…)
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    Christensen v. Christensen
    ¶4     Following a hearing, the trial court ruled on the petition
    to modify. The court denied Brent’s request to terminate alimony
    on the basis of Elena’s cohabitation. The court found that the
    evidence failed to establish cohabitation; the court noted
    particularly that Elena did not hold herself out as the spouse of
    her boyfriend or share living expenses, assets, or bank accounts
    with him.
    ¶5      The court also rejected Brent’s claim that his retirement
    justified a termination or reduction in alimony. The court found
    that Brent “is physically and mentally able to work and provide
    for the family” and that, while his income had decreased, so had
    his expenses. The court therefore set his monthly income at
    $4,700 “consistent with his historical earnings.”
    ¶6     However, the court reduced Brent’s alimony obligation by
    the amount of the monthly retirement payments to Elena from
    Brent’s pension, setting alimony at $400 ($1200 less $800) for
    future payments only.
    ¶7     The court then denied Brent’s petition to modify child
    support. The court ruled that child support would remain at
    $548 per month, finding that amount to be “appropriate based
    on the income of each parent.”
    (…continued)
    However, this claim of error is not properly before us because
    Elena “failed to bring [it] either by way of a cross-appeal or by
    separate petition for interlocutory appeal.” See State v. Coble,
    
    2010 UT App 98
    , ¶ 10, 
    232 P.3d 538
     (“‘[Litigants must] cross-
    appeal or cross-petition if they wish to attack a judgment of a
    lower court for the purpose of enlarging their own rights or
    lessening the rights of their opponent.’” (alteration in original)
    (quoting State v. South, 
    924 P.2d 354
    , 355 (Utah 1996))). We
    therefore do not address it further.
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    Christensen v. Christensen
    ¶8    Finally, the court entered judgment against Brent in the
    amount of $19,043.61 for alimony and child support arrears as of
    October 1, 2015.
    ISSUES AND STANDARDS OF REVIEW
    ¶9     Brent asserts four claims of error on appeal. First, he
    contends that the trial court erred in finding that the evidence
    did not establish that Elena cohabited with another man.
    “Whether cohabitation exists is a mixed question of fact and law.
    While we defer to the trial court’s factual findings unless they
    are shown to be clearly erroneous, we review its ultimate
    conclusion for correctness.” Myers v. Myers (Myers I), 
    2010 UT App 74
    , ¶ 10, 
    231 P.3d 815
     (citations and internal quotation
    marks omitted), aff’d, Myers v. Myers (Myers II), 
    2011 UT 65
    , 
    266 P.3d 806
    .
    ¶10 Second, Brent contends that the trial court erred in finding
    him capable of employment. A “[trial] court’s determination that
    [a party] is capable of employment is within the sound discretion
    of the trial court since the court is in an advantaged position to
    weigh the evidence, determine the persuasive value of the
    evidence, and make determinations based on the evidence.”
    Leppert v. Leppert, 
    2009 UT App 10
    , ¶ 12, 
    200 P.3d 223
    . Brent also
    challenges the related findings that no substantial change in
    circumstances warranted modification of alimony, that he is
    voluntarily unemployed, and that his employment capacity and
    earning potential support imputation of income. “The
    determination of the trial court that there [has or has not] been a
    substantial change of circumstances . . . is presumed valid, and
    we review the ruling under an abuse of discretion standard.”
    Busche v. Busche, 
    2012 UT App 16
    , ¶ 7, 
    272 P.3d 748
     (alteration
    and omission in original) (citation and internal quotation marks
    omitted). We also review the trial court’s finding of voluntary
    unemployment or underemployment and its calculation of
    imputed income for an abuse of discretion. See Rayner v. Rayner,
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    Christensen v. Christensen
    
    2013 UT App 269
    , ¶ 4, 
    316 P.3d 455
    . “We will not disturb a trial
    court’s findings of fact unless they are clearly erroneous, that is,
    unless they are in conflict with the clear weight of the evidence,
    or this court has a definite and firm conviction that a mistake has
    been made.” Pope v. Pope, 
    2017 UT App 24
    , ¶ 4, 
    392 P.3d 886
    (citation and internal quotation marks omitted).
    ¶11 Third, Brent contends that the trial court erred in
    declining to apply the modification of the alimony award
    retroactively. “A [trial] court’s determination regarding the
    retroactive modification of a spousal support obligation is
    reviewed for an abuse of discretion.” McPherson v. McPherson,
    
    2011 UT App 382
    , ¶ 12, 
    265 P.3d 839
    .
    ¶12 Fourth, Brent contends that the trial court erred in its
    child support calculation. We review decisions on child support
    under the abuse of discretion standard. Andrus v. Andrus, 
    2007 UT App 291
    , ¶ 9, 
    169 P.3d 754
    .
    ANALYSIS
    I. Cohabitation
    ¶13 Brent contends that the trial court erred in ruling the
    evidence of shared common residency and consistent sexual
    relations did not establish cohabitation. Specifically, he argues
    that “the evidence established that [Elena] was living together
    with her boyfriend as a family, sharing the same bedroom and
    engaging in normal sexual relations.” He also alleges that the
    trial court “ignored [Elena’s admission] that she paid rent and all
    of the expenses for food and everything” in the household.
    Finally, he argues that the fact that Elena and her boyfriend did
    not hold themselves out to be husband and wife has never been
    a criterion for determining cohabitation.
    ¶14 “Any order of the court that a party pay alimony to a
    former spouse terminates upon establishment by the party
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    Christensen v. Christensen
    paying alimony that the former spouse is cohabitating with
    another person.” 
    Utah Code Ann. § 30-3-5
    (10) (LexisNexis 2013).
    Utah courts have not delineated a list of required elements for
    cohabitation, but instead have identified “general hallmarks of
    marriage (and thus cohabitation).” Myers II, 
    2011 UT 65
    , ¶ 24,
    
    266 P.3d 806
    . “Those hallmarks include a shared residence, an
    intimate relationship, and a common household involving
    shared expenses and shared decisions.” 
    Id.
     Other relevant
    considerations include “the length and continuity of the
    relationship, the amount of time the couple spends together, the
    nature of the activities the couple engages in, and whether the
    couple spends vacations and holidays together.” 
    Id.
     ¶ 24 n.3.
    However, whether the couple has a reputation as being married,
    or hold themselves out as being married, is not a relevant
    consideration in determining cohabitation for purposes of
    section 30-3-5(10). 
    Id.
     ¶ 24 n.4. 3
    ¶15 Here, Elena acknowledged that she was sharing a
    bedroom with her boyfriend. However, when asked whether she
    was cohabiting with him, she responded that after she was
    evicted from her home, she “had nowhere to go so [she] moved
    in at [his] address.” She signed a written “Living Arrangement
    Agreement” in which she agreed to pay $500 per month “to help
    with the payment of the mortgage and the cost of utilities as part
    of [her] contribution of living expenses” for herself and her four
    children.
    ¶16 The trial court noted that Elena admitted that “she shares
    common residency with a man and that they have sexual
    relations.” The court reasoned that although these factors are
    relevant, “they do not satisfy the definition of cohabitation”
    3. In contrast, the fact that a couple “hold themselves out as and
    have acquired a uniform and general reputation as” spouses is a
    badge of a valid—though unsolemnized—marriage. See 
    Utah Code Ann. § 30-1-4.5
    (1)(e) (LexisNexis 2012).
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    Christensen v. Christensen
    under Myers I, 
    2010 UT App 74
    , 
    231 P.3d 815
    , and related cases.
    The court then considered the following additional factors. First,
    it found “no evidence that [Elena] held herself out as the wife
    [of] the boyfriend.” The court also found that she and the
    boyfriend “did not have a reputation as husband and wife.”
    Finally, it found no evidence that she “shared living expenses,
    assets, or bank accounts with the boyfriend.” Relying on these
    factors, the court concluded that the “evidence is insufficient to
    establish cohabitation as outlined in [Myers I].” It therefore
    denied Brent’s petition to terminate alimony on the basis of
    cohabitation.
    ¶17 First, as noted above, Brent is correct that whether two
    people hold themselves out, or have a reputation, as being
    married plays no part in the cohabitation analysis for purposes
    of determining whether alimony must be terminated. See Myers
    II, 
    2011 UT 65
    , ¶ 24 n.4. Thus, the trial court erred in relying on
    this factor. However, the court correctly found that no evidence
    supported a finding that Elena and her boyfriend share living
    expenses, assets, or bank accounts. On the contrary, she paid
    him room and board pursuant to the terms of a written
    agreement.
    ¶18 In sum, Elena and her boyfriend share a residence and an
    intimate relationship but not living expenses. But the record
    does not show evidence of the other pertinent considerations
    outlined above. For example, the record does not show that they
    jointly make life decisions. Nor does the record show the length
    of their relationship, the amount of time they spend together, or
    whether they spend vacations and holidays together.
    See 
    id.
     ¶ 24 n.3 (noting that “these considerations [are] not
    prerequisites or requirements,” but are relevant to the “broader
    picture” of “whether a relationship resembles that of a married
    couple”). Thus, on this record we cannot say that the trial court’s
    erroneous reliance on the couple’s reputation was harmless.
    Accordingly, we remand this issue to the trial court to rebalance
    the factors and determine in the first instance whether the
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    Christensen v. Christensen
    evidence shows that Elena and her boyfriend are cohabiting
    under section 30-3-5(10) as construed in Myers II.
    II. Employment
    ¶19 Brent next contends that the trial court erred in finding
    that he was capable of full-time work. He argues that because
    the trial court did not “make any findings supporting that he
    was employable,” it should not have imputed “additional
    income to his $3,037 per month retirement benefit.” He further
    argues that the trial court should have considered that he
    wanted to be a stay-at-home father, that “his medical
    practitioner advised retirement,” and that he was “forced to
    retire due to physical and psychological problems.”
    ¶20 After entering a divorce decree, “[t]he court has
    continuing jurisdiction to make substantive changes and new
    orders regarding alimony based on a substantial material change
    in circumstances not foreseeable at the time of the divorce.” 
    Utah Code Ann. § 30-3-5
    (8)(i)(i) (LexisNexis 2013). Thus, to succeed on
    a petition to modify, “the moving party must first show that a
    substantial material change of circumstance has occurred since
    the entry of the decree and [second, that the change was] not
    contemplated in the decree itself.” Diener v. Diener, 
    2004 UT App 314
    , ¶ 7, 
    98 P.3d 1178
     (alteration in original) (citation and
    internal quotation marks omitted). The “party seeking
    modification . . . has the burden of showing a substantial change
    in circumstances.” 
    Id.
     (omission in original) (citation and internal
    quotation marks omitted).
    ¶21 The trial court must first determine whether a substantial
    change in circumstances warrants consideration of the
    modification petition, and if so, then the court will conduct the
    imputation analysis. Busche v. Busche, 
    2012 UT App 16
    , ¶ 13, 
    272 P.3d 748
    . The imputation analysis “involves determining
    whether [a party] is voluntarily unemployed or underemployed
    and, if so, how much income ought to be imputed.” 
    Id.
     “A
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    Christensen v. Christensen
    person is voluntarily unemployed or underemployed when he
    or she intentionally chooses of his or her own free will to become
    unemployed or underemployed.” Ouk v. Ouk, 
    2015 UT App 104
    ,
    ¶ 7, 
    348 P.3d 751
     (citation and internal quotation marks omitted).
    ¶22 “If income is imputed to a parent, the income shall be
    based upon employment potential and probable earnings
    considering, to the extent known: employment opportunities;
    work history; occupation qualifications; . . . and prevailing
    earnings and job availability for persons of similar backgrounds
    in the community.” Utah Code Ann. § 78B-12-203(8)(b)
    (LexisNexis 2012). “Imputation cannot be premised upon mere
    conjecture; instead, it demands a careful and precise assessment
    requiring detailed findings.” Rayner v. Rayner, 
    2013 UT App 269
    ,
    ¶ 10, 
    316 P.3d 455
     (citation and internal quotation marks
    omitted). Thus, “the trial court must enter not just a finding of
    voluntary unemployment . . . but specific, detailed findings as to
    the evidentiary basis for the imputation.” 
    Id.
     (citation and
    internal quotation marks omitted). To challenge the trial court’s
    findings, Brent must marshal the evidence in support of its
    decision and demonstrate that, despite this evidence, “the trial
    court’s findings are so lacking in support as to be ‘against the
    clear weight of the evidence,’ thus making them ‘clearly
    erroneous.’” See Hagan v. Hagan, 
    810 P.2d 478
    , 481 (Utah Ct. App.
    1991) (quoting In re Estate of Bartell, 
    776 P.2d 885
    , 886 (Utah
    1989)).
    ¶23 Here, the trial court began by considering Brent’s claim of
    “a material change in income to justify modification.” The court
    found that Elena’s income increased from $1,365 to $1,640 per
    month (not including her share of Brent’s pension) and that
    Brent’s monthly income decreased from $4,749 from his salary as
    a school teacher to $3,037.33 from his retirement pension.
    However, the court also found that Brent’s monthly expenses
    decreased—in particular, that he had “no house payment or
    vehicle payment.” Relying on these calculations, the court
    concluded that “[w]hile [Brent’s] income has decreased so have
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    Christensen v. Christensen
    his expenses.” Thus, the court did not find his change in income
    to be a substantial change in circumstances justifying
    modification of alimony.
    ¶24 Brent has not challenged any of these factual findings as
    clearly erroneous. Instead, he cursorily argues that his retirement
    “resulted in a significant reduction to his personal income.” But
    he “has neither marshaled the evidence in support of the trial
    court’s decision nor demonstrated that despite this evidence, the
    trial court’s findings are so lacking in support as to be against
    the clear weight of the evidence.” See id. at 483. Accordingly, he
    has not overcome the presumption that the court did not abuse
    its discretion in concluding that there was no substantial change
    in circumstances warranting modification of alimony. See Busche,
    
    2012 UT App 16
    , ¶ 7.
    ¶25 The court also addressed the issue of whether Brent was
    voluntarily unemployed. Brent testified to four reasons why he
    was not working: that he had “a constitutional right to retire and
    remain retired after teaching 32 years in the public school
    education profession”; that he “was forced to retire by the
    Ogden City School District or [he] would have probably been
    fired”; that “many of [his] peers that are [his] same age whose
    wives didn’t divorce them are now retiring”; and that he
    “want[s] to be a stay-at-home parent for the best benefit of [his]
    children.”
    ¶26 Brent also offered expert testimony from Damon Marsh, a
    physician’s assistant. Marsh’s testimony was mixed. On the one
    hand, he opined that, based on various conditions, Brent’s
    retirement was “medically necessary.” On the other hand, he
    testified that Brent might be able to return to work “six months
    [to] a year” after vocational rehabilitation, a psychological
    assessment, and an orthopedic evaluation. And when asked by
    the court whether his testimony that Brent couldn’t go back to
    work meant “that [Brent is] not capable of working period,”
    Marsh responded, “I’m not saying that, no.”
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    Christensen v. Christensen
    ¶27 The court considered each of Brent’s arguments about his
    employment capacity. The court first noted “there is no
    constitutional right to retire.” The court next considered Marsh’s
    testimony and noted that “Marsh stated [Brent] is capable of
    working.” The court also noted that Brent was “58 years old”
    and “retired from teaching after 32 years.” The court then
    rejected his argument that being “depressed from the divorce
    and forced retirement” rendered him unable to work. The court
    also gave little or no weight to his argument that his “wishes to
    enjoy retirement and stay at home with the children” justified a
    reduction in child support or alimony. Thus, the court found that
    he was “physically and mentally able to work and provide for
    the family.”
    ¶28 The court also considered Brent’s earning potential. The
    court found that while he “did not elect to stop working as a
    teacher, he is capable of employment in other fields.” The court
    noted that he “has a college degree and is physically and
    mentally able to work” and concluded that the “stress,
    depression, and anxiety he feels do not prevent [him] from
    working.”
    ¶29 The court concluded that “[t]he change in circumstances
    was created by [Brent]” and that he “should not benefit from a
    voluntary decision to stop working.” The court therefore
    imputed his “income at $4,700 a month which is consistent with
    his historical earnings.”
    ¶30 On appeal, Brent presents the same evidence showing a
    lack of employment capacity as he did in the trial court. He
    argues that “there is simply no evidence to support the claim
    that [he] is purposefully unemployed simply to reduce his child
    support or alimony.” He also argues that the court’s imputation
    analysis is based on mere conjecture that he may be capable of
    employment after rehabilitation.
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    Christensen v. Christensen
    ¶31 Again, Brent has failed to marshal the evidence in support
    of the court’s findings that he was capable of employment and
    that he was voluntarily unemployed, and he has not
    demonstrated that these findings are against the clear weight of
    the evidence. See Hagan v. Hagan, 
    810 P.2d 478
    , 483 (Utah Ct.
    App. 1991). “Formal briefing requirements aside, an argument
    that does not fully acknowledge the evidence supporting a
    finding of fact has little chance, as a matter of logic, of
    demonstrating that the finding lacked adequate factual
    support.” Bailey v. Retirement Board, 
    2012 UT App 365
    , ¶ 8, 
    294 P.3d 577
    . Thus, “a party challenging a factual finding . . . will
    almost certainly fail to carry its burden of persuasion on appeal
    if it fails to marshal.” State v. Nielsen, 
    2014 UT 10
    , ¶ 42, 
    326 P.3d 645
    .
    ¶32 This principle applies here. The evidence before the court,
    canvassed above, is sufficient to support the court’s findings.
    And because employment capacity “is within the sound
    discretion of the trial court,” we defer to the trial court’s finding
    that Brent is capable of employment. See Leppert v. Leppert, 
    2009 UT App 10
    , ¶ 12, 
    200 P.3d 223
     (“[T]he court is in an advantaged
    position to weigh the evidence, determine the persuasive value
    of the evidence, and make determinations based on the
    evidence.”). Based on the court’s detailed findings analyzing
    Brent’s employment capacity and earning potential, we further
    conclude that the court did not abuse its discretion in finding
    that he was voluntarily unemployed or in imputing income to
    him. See Rayner v. Rayner, 
    2013 UT App 269
    , ¶ 10, 
    316 P.3d 455
    .
    III. Alimony
    ¶33 Brent next contends that “[t]he trial court erred in failing
    to retroactively award a reduction in alimony due to [Elena’s]
    receiving retirement benefits.” He argues that the trial court
    erred by “failing to follow statutory requirements that alimony
    modification should be retroactive to the date of the service of
    the petition to modify.” In addition, he argues that even if the
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    court had discretion to refuse to apply the alimony modification
    retroactively, “the court overstepped its discretion” in refusing
    to do so here. Specifically, he alleges that “[t]he trial court gave
    no explanation as to the reasoning for allowing a 12-month
    windfall to [Elena]” during which she received $800 per month
    in retirement payments in addition to him owing her $1,200 per
    month in alimony.
    ¶34 The Utah Child Support Act provides that after an
    installment of child or spousal support falls due, it is “not subject
    to retroactive modification.” Utah Code Ann. § 78B-12-112(3)(c)
    (LexisNexis 2012); see also Wall v. Wall, 
    2007 UT App 61
    , ¶ 20, 
    157 P.3d 341
     (stating that, as a general rule, child support orders are
    not subject to retroactive modification). However, the following
    subsection contains an exception allowing the court to
    retroactively modify a child or spousal support obligation:
    A child or spousal support payment under a
    support order may be modified with respect to any
    period during which a modification is pending, but
    only from the date of service of the pleading on
    the obligee, if the obligor is the petitioner, or on the
    obligor, if the obligee is the petitioner. If the
    tribunal orders that the support should be
    modified, the effective date of the modification
    shall be the month following service on the parent
    whose support is affected. Once the tribunal
    determines that a modification is appropriate, the
    tribunal shall order a judgment to be entered for
    any difference in the original order and the
    modified amount for the period from the service of
    the pleading until the final order of modification is
    entered.
    Utah Code Ann. § 78B-12-112(4).
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    Christensen v. Christensen
    ¶35 Brent relies on the second sentence of this section, which
    read in isolation does seem to mandate retroactive modification
    of support:
    If the tribunal orders that the support should be
    modified, the effective date of the modification
    shall be the month following service on the parent
    whose support is affected.
    
    Id.
     However, we do not read statutory text in isolation, but in
    context. See State v. Robertson, 
    2017 UT 27
    , ¶ 32 (“A familiar
    canon of statutory construction is that the context of a statute
    may eliminate potential interpretations of a statutory phrase.”);
    see also Arkansas Game & Fish Comm'n v. United States, 
    568 U.S. 23
    ,
    36 (2012) (stating that “the first rule of . . . statutory
    interpretation is: Read on.”). And the preceding sentence grants
    courts “the discretion to determine both if and when a
    modified . . . support award should be made retroactive.” Wall,
    
    2007 UT App 61
    , ¶ 21 (citation and internal quotation marks
    omitted). It also grants the court discretion to modify alimony
    for any period during which the petition for modification is
    pending:
    A child or spousal support obligation under a
    support order may be modified with respect to any
    period during which a modification is pending . . . .
    Utah Code Ann. § 78B-12-112(4). Accordingly, as we have
    previously held, the statute provides “that support may be
    modified retroactively with respect to any post-service period,
    not that it must be.” Wall, 
    2007 UT App 61
    , ¶ 21 (emphases added)
    (citation and internal quotation marks omitted). Thus, “[c]ourts
    have discretion”—but not a duty—“to modify child support and
    alimony awards retroactively.” See Roberts v. Roberts, 
    2014 UT App 211
    , ¶ 25, 
    335 P.3d 378
    . In sum, Brent’s contention that Utah
    law requires retroactive modification of his alimony obligation,
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    Christensen v. Christensen
    though enjoying some textual support, fails on closer inspection
    of the controlling statute and opinions of this court construing it.
    ¶36 We next consider Brent’s contention that, even if the trial
    court had discretion to deny retroactive modification, it
    exceeded its discretion in doing so. In McPherson v. McPherson,
    we stated that trial courts “have considerable discretion in
    determining alimony, and harsh awards or a disparity in
    obligations can be justified by a finding of one or more
    discretionary factors.” 
    2011 UT App 382
    , ¶ 20, 
    265 P.3d 839
    (citation and internal quotation marks omitted). For example,
    “an appropriate finding of voluntary underemployment and a
    resulting decision to impute income at a higher level may serve
    to motivate a spouse to seek employment more in line with his
    true earning capacity[.]” See id. ¶ 21.
    ¶37 Here, the trial court agreed with Brent’s argument that
    “alimony should be reduced by $800” because Elena receives a
    payment in that amount each month as a portion of his pension.
    The court also agreed that “[i]t would be a windfall for [Elena] to
    receive both retirement and alimony,” where the retirement was
    not part of the divorce. The court therefore reduced alimony
    from $1,200 to $400 per month. The court noted that Elena would
    still receive a total of $1,200 per month from Brent including the
    $800 retirement payment and the $400 alimony payment.
    However, while the court granted Brent’s motion to reduce
    alimony for future payments, it ruled that the “modification of
    alimony is not retroactive.” The court thus declined to alter the
    amount of the $19,043.61 judgment against him for unpaid
    alimony and child support. The court found that he “has the
    financial means to pay child support and alimony,” noting that
    he owned a $200,000 home that was paid off and had a 401(k)
    account with over $50,000.
    ¶38 Given the court’s “considerable discretion in determining
    alimony,” its finding that Brent was voluntarily unemployed
    and its decision to impute higher income to him constituted
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    “discretionary factors” justifying its denial of retroactive
    modification. See id. ¶ 20 (citation and internal quotation marks
    omitted). We therefore conclude that the trial court did not
    abuse its discretion in declining retroactive modification of the
    alimony award.
    IV. Child Support
    ¶39 Brent contends that “[t]he trial court erred in calculating
    child support.” He argues that “[t]he trial court made several
    findings that should have impacted the child support
    calculation,” yet “without any explanation ordered that the child
    support remain at $548 per month.” He alleges that “[t]he trial
    court clearly did not utilize the child support guidelines and
    failed to make any findings to support a deviation from the
    guidelines.”
    ¶40 “A parent . . . may at any time petition the court to adjust
    the amount of a child support order if there has been a
    substantial change in circumstances.” Utah Code Ann. § 78B-12-
    210(9)(a) (LexisNexis 2012). “A substantial change in
    circumstances sufficient to warrant modification occurs if one of
    the parent’s incomes changes ‘30% or more’ or there are
    ‘material changes in the employment potential and ability of a
    parent to earn’ that cause ‘a difference of 15% or more between
    the payor’s [original] support amount and the payor’s support
    amount that would be required under the guidelines’ using the
    new income.” Gore v. Grant, 
    2015 UT App 113
    , ¶ 14, 
    349 P.3d 779
    (alteration in original) (quoting Utah Code Ann. § 78B-12-
    210(9)(b)–(c)). “When such a substantial change of circumstances
    occurs, it is presumed that child support will be modified to the
    amount set forth in the guidelines.” Id. (citing Utah Code Ann.
    § 78B-12-210(2)). “That presumption is rebutted, however, if
    the . . . court determines that ‘complying with a provision of the
    guidelines or ordering an award amount resulting from use of
    the guidelines would be unjust, inappropriate, or not in the best
    interest of a child in a particular case.’” Id. (quoting Utah Code
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    Christensen v. Christensen
    Ann. § 78B-12-210(2)(a), (3)). “Should the court determine that
    the guidelines amount has been rebutted, the court shall make a
    finding to that effect,” id. (citing Utah Code Ann. § 78B-12-
    210(3)), and “then must devise a support order” based on
    statutory factors, id. (citing Utah Code Ann. § 78B-12-202(3)).
    ¶41 Here, the trial court ruled that child support would
    remain at $548 per month. As explained above, although the
    court found that Brent’s income decreased from $4,749.15 to
    $3,037.33 per month, the court imputed his monthly income at
    $4,700 per month. The court also found that Elena’s income
    increased from $1,365 per month at the time of the divorce to
    $1,640 per month—not including her share of Brent’s pension—
    at the time of the petition to modify. The court determined that
    “child support in the sum of $548 is appropriate based on the
    income of each parent.”
    ¶42 Brent argues that, because the trial court found that the
    parties’ incomes changed, the court should have used the
    statutory child support guidelines to recalculate the amount of
    child support. But he has not shown a substantial change in
    circumstances in light of his imputed income as required by the
    statutory guidelines outlined above. See id. Given that Brent
    failed to argue any additional grounds for modification of child
    support, the court did not abuse its discretion in denying the
    petition to modify child support. See Andrus v. Andrus, 
    2007 UT App 291
    , ¶ 9, 
    169 P.3d 754
    .
    ¶43 We conclude by briefly addressing Brent’s argument at
    trial that his payment of the children’s school expenses should
    absolve him of the obligation to pay child support. We disagree.
    It is well-established that “[b]oth parents have an obligation to
    support their children. A child’s right to that support is
    paramount.” See Woodward v. Woodward, 
    709 P.2d 393
    , 394 (Utah
    1985). This principle applies in the context of school expenses. “If
    child support is inadequate to cover expenses parents wish to
    incur on behalf of their children, such as private school,
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    Christensen v. Christensen
    extracurricular activities, or . . . advanced placement tests, there
    is nothing to prevent parents from agreeing to share such
    additional expenses in the interest of their children.” Davis v.
    Davis, 
    2011 UT App 311
    , ¶ 15, 
    263 P.3d 520
    . “However, these
    things are not necessities and must generally be budgeted as part
    of child support if the parties cannot agree otherwise.” 
    Id.
    ¶44 Here, Brent and Elena were unable to agree on how to
    pay for school expenses, and Brent chose to pay for school
    expenses rather than pay child support. However, because “each
    child support payment became a judgment on the date it was
    due,” he “cannot offset his obligation for the child support
    arrearages that were due long before he contributed [money] to
    his [children’s] education.” See Vicchrilli v. Tracy, 
    2011 UT App 354
    , ¶ 10, 
    264 P.3d 760
    . Accordingly, notwithstanding his
    payment of school expenses, Brent must meet his child support
    obligations, both past and present.
    CONCLUSION
    ¶45 For the foregoing reasons, we conclude that the trial court
    did not abuse its discretion in finding that Brent’s change in
    income did not justify modification of alimony; that he was
    capable of employment; that he was voluntarily unemployed;
    and that his employment capacity and earning potential
    supported imputation of income. We further conclude that the
    trial court did not abuse its discretion in denying retroactive
    modification of alimony and in denying modification of child
    support. We therefore affirm these rulings. However, because
    we conclude that the trial court erroneously considered a legally
    irrelevant factor in making its cohabitation determination, we
    vacate that ruling and remand to the trial court to determine
    whether Elena cohabited under the correct legal standard.
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