Wash. Rev. Code » Title 26 · Chapter 26.09
Revised Code of Washington

Wash. Rev. Code § 26.09.100 (2026)

✓ current as of May 2026
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(1) In a proceeding for dissolution of marriage or domestic partnership, legal separation, declaration of invalidity, maintenance, or child support, after considering all relevant factors but without regard to misconduct, the court shall order either or both parents owing a duty of support to any child of the marriage or the domestic partnership dependent upon either or both spouses or domestic partners to pay an amount determined under chapter 26.19 RCW.
(2) The court may require automatic periodic adjustments or modifications of child support. That portion of any decree that requires periodic adjustments or modifications of child support shall use the provisions in chapter 26.19 RCW as the basis for the adjustment or modification. Provisions in the decree for periodic adjustment or modification shall not conflict with RCW 26.09.170 except that the decree may require periodic adjustments or modifications of support more frequently than the time periods established pursuant to RCW 26.09.170.
(3) Upon motion of a party and without a substantial change of circumstances, the court shall modify the decree to comply with subsection (2) of this section as to installments accruing subsequent to entry of the court's order on the motion for modification.
(4) The adjustment or modification provision may be modified by the court due to economic hardship consistent with the provisions of *RCW 26.09.170(6)(a).
[ 2010 c 279 s 3; 2008 c 6 s 1013; 1991 sp.s. c 28 s 1; 1990 1st ex.s. c 2 s 1; 1989 c 375 s 7; 1988 c 275 s 9; 1987 c 430 s 3; 1973 1st ex.s. c 157 s 10.]

Notes:

*Reviser's note: RCW 26.09.170 was amended by 2020 c 227 s 13, changing subsection (6)(a) to subsection (8)(a), effective February 1, 2021.
Part headings not law—Severability—2008 c 6: See RCW 26.60.900 and 26.60.901.
Severability—1991 sp.s. c 28: "If any provision of this act or its application to any person or circumstance is held invalid, the remainder of the act or the application of the provision to other persons or circumstances is not affected." [ 1991 sp.s. c 28 s 9.]
Effective date—1991 sp.s. c 28: "Sections 1 through 9 of this act are necessary for the immediate preservation of the public peace, health, or safety, or support of the state government and its existing public institutions, and shall take effect September 1, 1991." [ 1991 sp.s. c 28 s 10.]
Captions not law—1991 sp.s. c 28: "Captions as used in this act do not constitute any part of the law." [ 1991 sp.s. c 28 s 11.]
Effective dates—1990 1st ex.s. c 2: "(1) Sections 5 and 22 of this act are necessary for the immediate preservation of the public peace, health, or safety, or support of the state government and its existing public institutions, and shall take effect immediately [March 26, 1990].
(2) The remainder of this act shall take effect July 1, 1990." [ 1990 1st ex.s. c 2 s 30.]
Severability—1990 1st ex.s. c 2: "If any provision of this act or its application to any person or circumstance is held invalid, the remainder of the act or the application of the provision to other persons or circumstances is not affected." [ 1990 1st ex.s. c 2 s 31.]
Effective dates—Severability—1988 c 275: See notes following RCW 26.19.001.
Severability—1987 c 430: See note following RCW 26.09.170.
Notes of Decisions
Cited in 61 cases (4 in the last 5 years), 1974–2026 · leading case: In re the Marriage of Ayyad, 38 P.3d 1033 (Wash. Ct. App. 2002).
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In re the Marriage of Ayyad, 38 P.3d 1033 (Wash. Ct. App. 2002). · cites it 5× “RCW 26.09.100(2). Here, the original decree provided for annual adjustments based on changes in income and other relevant factors.”
Childers v. Childers, 575 P.2d 201 (Wash. 1978). · cites it 3× “RCW 26.09.100 provides in part: [T]he court may order either or both parents owing a duty of support to any child of the marriage dependent upon either or both spouses to pay an amount reasonable or necessary for his support.”
In Re the Marriage of Gimlett, 629 P.2d 450 (Wash. 1981). · cites it 3× “RCW 26.09.100 states in pertinent part: [T]he court may order either or both parents owing a duty of support to any child of the marriage dependent upon either or both spouses to pay an amount reasonable or necessary for his support.”
In Re Marriage of Ayyad, 38 P.3d 1033 (Wash. Ct. App. 2002). · cites it 5× “RCW 26.09.100(2). Here, the original decree provided *1036 for annual adjustments based on changes in income and other relevant factors.”
In Re Marriage of Griffin, 791 P.2d 519 (Wash. 1990). · cites it 2× “RCW 26.09.100 authorizes the court to order either or both parents owing a duty of support to any child of the *775 marriage to pay an amount determined pursuant to the schedule adopted under RCW 26.”
In Re the Marriage of Mahalingam, 584 P.2d 971 (Wash. Ct. App. 1978). · cites it 4× “[5] We believe in these times of economic uncertainty where rampant inflation [6] quickly diminishes the effective amount of support, the use of a reasonable escalation provision is not violative of either RCW 26.09.100 [7] or RCW 26.09.170. [8] Under *235 the former statute, it…”
Harmon v. Dep't of Soc. & Health Servs., 134 Wash. 2d 523 (Wash. 1998). · cites it 2× “” Former RCW 26.09.100. RCW 74.20A.055 also was enacted in 1973.”
Harmon v. Dept. of Soc. & Health Serv., 951 P.2d 770 (Wash. 1998). · cites it 2× “" Former RCW 26.09.100. RCW 74.20A.055 also was enacted in 1973.”
In re the Marriage of Daubert, 99 P.3d 401 (Wash. Ct. App. 2004). · cites it 2× “RCW 26.09.100(1). The child support schedule shall be applied in all proceedings in which child support is determined or modified.”
In the Matter of Marriage of Lee, 788 P.2d 564 (Wash. Ct. App. 1990). · cites it 5× “termined the amount of support according to the child's age, and the child is no longer in the age category on which the current support amount was based; (c) If a child is still in high school, upon a finding that there is a need to extend support beyond the eighteenth birthday…”
In Re Marriage of Daubert, 99 P.3d 401 (Wash. Ct. App. 2004). · cites it 2× “RCW 26.09.100(1). The child support schedule shall be applied in all proceedings in which child support is determined or modified.”
In re the Marriage of Kahle, 134 Wash. App. 155 (Wash. Ct. App. 2006). · cites it 5× “Specifically, he maintains that the court ignored the plain language of RCW 26.09.100(2) when it held that a court order is required to implement the provisions of a decree that provides for periodic adjustment of child support.”
Show all 61 citing cases →
— Wash. Rev. Code § 26.09.100(1) — 17 cases
Balch v. Balch, 880 P.2d 78 (Wash. Ct. App. 1994).
Harmon v. Dep't of Soc. & Health Servs., 134 Wash. 2d 523 (Wash. 1998). “” Former RCW 26.09.100. RCW 74.20A.055 also was enacted in 1973.”
Harmon v. Dept. of Soc. & Health Serv., 951 P.2d 770 (Wash. 1998). “" Former RCW 26.09.100. RCW 74.20A.055 also was enacted in 1973.”
In re the Marriage of Daubert, 99 P.3d 401 (Wash. Ct. App. 2004). “RCW 26.09.100(1). The child support schedule shall be applied in all proceedings in which child support is determined or modified.”
In Re Marriage of Daubert, 99 P.3d 401 (Wash. Ct. App. 2004). “RCW 26.09.100(1). The child support schedule shall be applied in all proceedings in which child support is determined or modified.”
— Wash. Rev. Code § 26.09.100(2) — 12 cases
In re the Marriage of Ayyad, 38 P.3d 1033 (Wash. Ct. App. 2002). “RCW 26.09.100(2). Here, the original decree provided for annual adjustments based on changes in income and other relevant factors.”
In Re Marriage of Ayyad, 38 P.3d 1033 (Wash. Ct. App. 2002). “RCW 26.09.100(2). Here, the original decree provided *1036 for annual adjustments based on changes in income and other relevant factors.”
In re the Marriage of Kahle, 134 Wash. App. 155 (Wash. Ct. App. 2006). “Specifically, he maintains that the court ignored the plain language of RCW 26.09.100(2) when it held that a court order is required to implement the provisions of a decree that provides for periodic adjustment of child support.”
In re the Marriage of Abercrombie, 105 Wash. App. 239 (Wash. Ct. App. 2001).
In re the Marriage of Lee, 310 P.3d 845 (Wash. Ct. App. 2013).
— Wash. Rev. Code § 26.09.100(4) — 2 cases
In re the Marriage of Daubert, 99 P.3d 401 (Wash. Ct. App. 2004). “RCW 26.09.100(1). The child support schedule shall be applied in all proceedings in which child support is determined or modified.”
In Re Marriage of Daubert, 99 P.3d 401 (Wash. Ct. App. 2004). “RCW 26.09.100(1). The child support schedule shall be applied in all proceedings in which child support is determined or modified.”
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