OPINION
JACKSON, Presiding Judge:11 1 Appellant Paul R. Johansen appeals the trial court's denial of his motion for partial summary judgment. We reverse and remand.
BACKGROUND
T2 Appellant and Appellee were divorced in January, 1989. At that time they had three children: Laura, Lynsay, and Leisa. The divorce decree awarded Appellee a lump sum of $540.00 per month in child support, and did not address changes in child support when the children became "emancipated" 1 by reaching eighteen years of age. Laura reached her eighteenth birthday on September 2, 1995, as Lynsay did on October 1, 1997. Intervenor, Utah Office of Recovery Services (ORS), "collected child support and sought to collect arrears from [Appellant] after the children's eighteenth birthdays at the original child support amount without any adjustment." On February 15, 2000, Appellant petitioned the trial court to modify his child support obligation, seeking an order that would retroactively reduce his child support obligation from the time Laura and Lynsay became emancipated. The trial court denied his motion for partial summary judgment as to this issue. This appeal followed.
ISSUES AND STANDARD OF REVIEW
13 Appellant challenges the trial court's conclusion that "[blecause the decree of divorce was entered prior to" the enactment of Utah Code Ann. § 78-45-7.10 (Supp. 2001)2 (Automatic Adjustment Statute), that the Automatic Adjustment Statute, which "provides for an automatic adjustment of child support when a child" becomes emancipated, does not apply.3 Appellant also challenges the trial court's legal conclusion that
[blecause the parties' decree neither specifies a per-child amount of child support nor the incomes of the parties at the time the decree was entered, it is impossible for the Court to evaluate retroactively what child *522support should have been when the first child reached age 18 or when the second child reached 18.
T4 "' "Summary judgment is appropriate only when there are no genuine issues of material fact and the moving party is entitled to judgment as a matter of law." Because a summary judgment presents questions of law, we review the trial court's ruling for correctness." Krambule v. Krambule, 1999 UT App 357,¶ 10, 994 P.2d 210 (citations omitted); see also Department of Human Servs. v. Jacoby, 1999 UT App 52,¶7, 975 P.2d 989 ("''Whether a statute operates retroactively is a question of law, which we review for correctness without deference to the district court"" (Citation omitted.)); Brinkerhoff v. Brinkerhoff, 945 P.2d 113, 115 (Utah Ct.App.1997) (applying a correction of error standard of review to interpretation of statute governing child support proceedings); Ball v. Peterson, 912 P.2d 1006, 1009 (Utah Ct.App.1996) (same).
ANALYSIS
15 We first address whether the Automatic Adjustment Statute may apply to support orders in foree prior to the effective date of the statute. A statute may be applied retroactively where it "is merely procedural and does not 'enlarge, eliminate, or destroy vested or contractual rights'" Ball v. Peterson, 912 P.2d 1006, 1009 (Utah Ct. App.1996) (citation omitted); accord Pilcher v. State Dept. of Soc. Servs., 668 P.2d 450, 455 (Utah 1988). On the other hand, a statute is substantive and may not be applied retroactively where it "establishes 'a primary right and duty which was not in existence at the time [the claim] arose?" Id. (alteration in original) (quoting Washington Nat'l Ins. Co. v. Sherwood Assocs., 795 P.2d 665, 669-70 (Utah Ct.App.1990)); accord Brown & Root Indus. Serv. v. Industrial Comm'n, 947 P.2d 671, 675 (Utah 1997).
16 "[Nlo one has any vested rights in a [child] support decree which statutorily may be changed from time to time by a court under its continuing jurisdiction. ..." Wiker v. Wiker, 600 P.2d 514, 515 (Utah 1978); accord Kocherov v. Kocherov, 775 S.W.2d 539, 541 (Mo.Ct.App.1989) ("'Since a child support order is modifiable after judgment . a child's right to future, unacerued installments of child support is not a vested right.'" (Citation omitted.)). In other words, a child support payment does not become a vested right until it accrues. The Automatic Adjustment Statute became effective before the child support payments in question accrued. Indeed, the Automatic Adjustment Statute became effective April 24, 1989, see Utah Code Ann. § 78-45-7.10 (Supp. 1989), while Laura and Lynsay became eighteen years old on September 2, 1995 and October 1, 1997 respectively. Thus, at the time the statute became effective, no one had a vested right to the child support payments that would acerue after Laura's or Lynsay's eighteenth birthdays. Accordingly, the statute, as applied to Laura and Lynsay, "is merely procedural and does not 'enlarge, eliminate, or destroy vested or contractual rights'" Ball, 912 P.2d at 1009 (citation omitted). As a result, we conclude the Automatic Adjustment Statute may be applied retroactively to Laura and Lynsay.4 See id.
*523T7 Appellant next challenges the trial court's conclusion that because the divorce decree awarding child support predated the child support guidelines, it is "impossible" to calculate the child support award according to those guidelines.5 Put differently, he argues the trial court interpreted the Automatic Adjustment Statute in a way that would render portions of it inoperable, thus presenting us with a question of statutory interpretation.
[Olur primary goal when construing statutes is to evince "the true intent and purpose of the Legislature [as expressed through] the plain language of the Act." In doing so, we seek "to render all parts thereof relevant and meaningful," and we accordingly avoid interpretations that will render portions of a statute superfluous or inoperative.
Hall v. Utah State Dep't of Corr,, 2001 UT 34, ¶15, 24 P.3d 958 (second alteration in original) (citations omitted).
18 We do not agree that the statute should be construed in a manner that renders it superfluous or inoperative. The Automatic Adjustment Statute reduces the combined child support obligation "to reflect the [amount] shown in the table for the remaining number of children due child support." Utah Code Ann. $ 78-45-7.10 (emphasis added). Utah Code Ann. § 78-45-2(5) (Supp. 2001) provides that " 'table' means the appropriate table in Section 78-45-7.14." Neither section specifies which year's table should be applied. "[OImissions in statutory language should 'be taken note of and given effect'" Biddle v. Washington Terrace City, 1999 UT 110,114, 998 P.2d 875 (citation omitted). Giving effect to the Legislature's omission requires us to interpret the omission of a specific year as the Legislature's intent to apply tables in effect as of the same year as the omission. If it intended a different year's statute to be applied, it would have said so. Also, we cannot suppose that the Legislature intended this statute to be rendered inoperative simply because no "table" existed at the time many of the orders to which the statute would later apply were entered. Thus, giving effect to the Legislature's omission, and to avoid an interpretation that would often render the statute inoperative, we conclude "the table" referred to in the Automatic Adjustment Statute to be the base combined child support obligation table in effect the same year as the version of the Automatic Adjustment Statute that is being applied.6
T9 Further, we note that the base combined child support obligation table, as applied here, is procedural in nature for the same reasons that the Automatic Adjustment Statute is procedural. Thus, the guidelines referred to in the Automatic Adjustment Statute may also be applied retroactively in this case. Accordingly, we reverse the trial court's ruling that calculating the child support award in this case is "impossible" simply because the divorcee decree awarding child support predated the guidelines referenced in the Automatic Adjustment Statute.
110 Next, we address Appellant's challenge to the trial court's conclusion that "[blecause the parties' decree neither specifies a per-child amount of child support nor *524the incomes of the parties at the time the decree was entered, it is impossible for the Court to evaluate retroactively what child support should have been when the first child reached age 18 or when the second child reached 18." This challenge also presents us with a question of statutory interpretation. We determine that the trial court erred in its legal conclusion.
{11 Nothing in the plain language of the statute makes automatic adjustment of a child support order dependent on whether the original order specified a per-child amount or the parties' incomes at the time the order was entered. Indeed, the Automatic Adjustment Statute simply states that "the base child support award is automatically reduced ... [as] shown in the table for the remaining number of children due child support, unless otherwise provided in the child support order." Utah Code Ann. § 78-45-7.10 (Supp. 2001). This unambiguous language plainly requires automatic reduction unless otherwise provided in the original order. Here, the original order does not provide otherwise.
( 12 Moreover, the 2000 atuiendment to the Automatic Adjustment Statute specifically provides a solution where the original order fails to specify the parties' incomes:
(38) The income used for purposes of adjusting the support shall be the income of the parties at the time of the entry of the original order. If income was not listed in the findings or order and worksheets were not submitted, the parties may submit tax returns or other verification of the income.
Utah Code Ann. § 78-45-7.10(8) (Supp. 2001). Thus, automatic reduction of a child support award is not made "impossible" simply because the parties' incomes were not specified in the original order. Accordingly, Appellant's child support obligation should have been automatically adjusted when Laura and Lynsay were emancipated.
CONCLUSION
T13 Utah Code Ann. § 78-45-7.10 (Supp. 2001) is procedural as applied to Appellant. Thus, Appellant is entitled to retroactive reduction of the base child support award as of Laura's and Lynsay's respective emancipa-tions. Those reductions should be calculated according to the "base combined child support obligation shown in the table for the remaining number of children due child support," as indicated above, Utah Code Anu. § 78-45-7.10 (Supp. 2001)... Accordingly, we reverse and remand for further proceedings consistent with this opinion.
114 I CONCUR: WILLIAM A. THORNE JR., Judge.
. The heading of Utah Code Ann. § 78-45-7.10 (Supp. 2001), which provides for the automatic adjustment of a child support obligation when a child reaches the age of eighteen or graduates from high school, is entitled "Adjustment when child becomes emancipated." We note that "emancipation" is a legal term of art, which has a broader meaning than the Legislature intended when referring to the effect of this statute. See Black's Law Dictionary 539 (Ith ed. 1999). However, for the sake of convenience, we use the term in the narrower sense intended by the Legislature when referring to section 78-45-7.10.
. This statute provides:
(1) When a child becomes 18 years of age, or has graduated from high school during the child's normal and expected year of graduation, whichever occurs later, the base child support award is qutomatically adjusted to reflect the base combined child support obligation shown in the table for the remaining number of children due child support, unless otherwise provided in the child support order.
(2) The award may not be reduced by a per child amount derived from the base child support award originally ordered.
(3) The income used for purposes of adjusting the support shall be the income of the parties at the time of the entry of the original order. If income was not listed in the findings or order and worksheets were not submitted, the parties may submit tax returns or other verification of the income.
Utah Code Ann. § 78-45-7.10 (Supp. 2001) (emphasis added).
. The trial court ruled that the Automatic Adjustment Statute is inapplicable here, concluding that the statute cannot be applied retroactively. Moreover, it concluded, implicitly in its order and expressly in its signed minute entry preceding its order, that because the divorce decree awarding child support predated the child support "guidelines" referenced in the statute, it is "impossible" to calculate the child support award according to those guidelines. Appellant challenges both conclusions.
. Effective May 1, 2000, following Laura's and Lynsay's eighteenth birthdays, the Automatic Adjustment Statute was amended. Appellant argues we should apply the most recent version of the statute, which substituted "adjusted" for ""reduced" and deleted "lower" before "base" in subsection (1). The amendment also added subsection (3), which provides:
(3) The income used for purposes of adjusting the support shall be the income of the parties at the time of the entry of the original order. If income was not listed in the findings or order and worksheets were not submitted, the parties may submit tax returns or other verification of the income.
Utah Code Ann. § 78-45-7.10 (Supp. 2001). These amendments merely "'prescribe[ ] the practice and procedure or the legal machinery by which the substantive law is determined or made effective,'" Olsen v. Samuel McIntyre Inv. Co., 956 P.2d 257, 260 (Utah 1998) (citation omitted), or "simply clarifly] the Legislature's previous intentions." Washington Nat'l Ins. Co. v. Sherwood Assocs., 795 P.2d 665, 669 (Utah Ct.App. 1990). They do not " 'enlarge, eliminate, or destroy vested or contractual rights;'" thus, they are procedural and may also be applied retroactively. Ball v. Peterson, 912 P.2d 1006, 1009 (Utah Ct.App.1996) (citation omitted). "[If a statutory amendment is deemed procedural or remedial, then it applies to all actions-those which have accrued or are pending (pending from time of commencement until final determination), and to future actions." Wilde v. Wilde, *523969 P.2d 438, 442 (Utah Ct.App.1998). Accordingly, Utah Code Ann. § 78-45-7.10 (Supp. 2001) should be applied.
. ORS characterizes the trial court's conclusion to mean that "the automatic nature of this provision can only work if a guideline table existed and was utilized in calculating the original order."
. Thus, as applied here, the "table" referred to in Utah Code Ann. § 78-45-7.10 (Supp. 2001) is Utah Code Ann. § 78-45-7.14 (1996), which was in effect at the time Lynsay was emancipated. There were no substantive changes between this table and the tables in effect when Laura was emancipated in 1995. Compare Utah Code Anu. § 78-45-7.14 (1996), with Utah Code Ann. § 78-45-7.14 (Supp. 1994). If the amounts in the table referred to in the newer version of the Automatic Adjustment Statute had changed from the time Laura was emancipated, the 1996 table would not be "merely procedural" because it would " 'enlarge, eliminate, or destroy vested ... [child support] rights'" since child support for Laura had already accrued in 1995. Ball, 912 P.2d at 1009 (citation omitted). Further, under these circumstances, Utah Code Ann. § 78-45-7.10 (Supp. 2001) would also be substantive as applied to Laura because it would apply a substantively amended table, and we would not be able to apply the most recent version of the statute retroactively to her.