Child Support Modification

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SUPERIOR COURT OF WASHINGTON FOR [COUNTY] COUNTY

FAMILY LAW DIVISION


PETITION TO MODIFY CHILD SUPPORT ORDER

(Wash. Rev. Code §§ 26.09.170; 26.18; 26.19)


TABLE OF CONTENTS

  1. Document Header
  2. Recitals
  3. Definitions
  4. Jurisdiction & Venue
  5. Allegations Supporting Modification
  6. Requested Modifications
  7. Child Support Calculation & Worksheets
  8. Enforcement & Remedies
  9. Representations and Warranties
  10. General Provisions
  11. Verification
  12. Certificate of Service
  13. Signature Block

1. DOCUMENT HEADER

Case No.: [___]
Assigned Judge: [___]

In re the:
• Parentage and Support of [CHILD(REN) NAME(S)], minor child(ren).

Petitioner: [PETITIONER FULL LEGAL NAME] (“Petitioner”)
Respondent: [RESPONDENT FULL LEGAL NAME] (“Respondent”)

Effective Date of Current Support Order: [DATE]
County Where Entered: [COUNTY]


2. RECITALS

A. The parties are the parents of the minor child(ren) identified above.
B. A valid child support order (“Existing Order”) was entered on the Effective Date.
C. Pursuant to Wash. Rev. Code § 26.09.170, this Petition seeks modification of the Existing Order based on the substantial change in circumstances detailed herein.
D. Good cause exists for the requested relief, and modification is in the best interests of the child(ren).


3. DEFINITIONS

“Child Support Schedule” means the Washington State Child Support Schedule codified at Wash. Rev. Code ch. 26.19.

“Net Income” has the meaning assigned in Wash. Rev. Code § 26.19.071 and all related administrative regulations.

“Substantial Change in Circumstances” means any material, involuntary, and continuing change impacting either parent’s ability to pay or the child(ren)’s financial needs, including but not limited to income fluctuation, health conditions, or changes to residential schedule, as contemplated by Wash. Rev. Code § 26.09.170(1)(b).


4. JURISDICTION & VENUE

4.1 Subject-Matter Jurisdiction. The Court has subject-matter jurisdiction over child support under Wash. Rev. Code chs. 26.09 and 26.26A.

4.2 Personal Jurisdiction. Both parties reside or transact sufficient activities within Washington to confer personal jurisdiction.

4.3 Venue. Venue is proper in [COUNTY] County under Superior Court Civil Rule 82 and Wash. Rev. Code § 26.09.


5. ALLEGATIONS SUPPORTING MODIFICATION

5.1 Change in Income. Since entry of the Existing Order:
a. Petitioner’s gross monthly income changed from $[OLD] to $[NEW]; and/or
b. Respondent’s gross monthly income changed from $[OLD] to $[NEW].

5.2 Child-Related Expenses. Extraordinary expenses have arisen for the child(ren), including [medical/educational/therapy] costs of approximately $[AMOUNT] per month.

5.3 Residential Schedule. The parenting plan entered on [DATE] modified residential time, shifting primary care to [Petitioner/Respondent] for [NUMBER] overnights per year.

5.4 Duration Since Entry. More than twenty-four (24) months have elapsed since entry of the Existing Order, satisfying the periodic review ground under Wash. Rev. Code § 26.09.170(1)(c)(ii).

5.5 Best Interests. The requested modification aligns with the child(ren)’s best interests, providing stability and adequate financial support.


6. REQUESTED MODIFICATIONS

Petitioner respectfully requests that the Court enter an amended child support order that:

6.1 Recalculates each parent’s support obligation consistent with the Child Support Schedule and Worksheets attached as Exhibit A.

6.2 Sets basic child support at $[AMOUNT] per month, allocated as follows:
• Petitioner: $[AMOUNT]
• Respondent: $[AMOUNT]

6.3 Orders proportional sharing of daycare, uninsured medical, and extracurricular expenses per Wash. Rev. Code § 26.19.080, with each parent paying the following percentages:
• Petitioner: [___] %
• Respondent: [___] %

6.4 Continues support until the later of the child’s eighteenth (18th) birthday or graduation from high school, or as otherwise provided by statute or court order.

6.5 Issues an Immediate Income Withholding Order pursuant to Wash. Rev. Code § 26.18.060, directing the obligor’s employer to withhold wage deductions up to fifty percent (50 %) of disposable earnings.

6.6 Awards judgment for any support arrears accruing through the date of entry, plus statutory interest.

6.7 Grants such other and further relief as equity and justice require.


7. CHILD SUPPORT CALCULATION & WORKSHEETS

7.1 Standard Calculation. Support is computed using the parties’ Net Incomes and the Economic Table (Wash. Rev. Code § 26.19.020).

7.2 Deviation Factors. Petitioner requests a deviation based on:
• Income of current spouse/domestic partner (RCW 26.19.075(1)(b));
• Extraordinary debt (RCW 26.19.075(1)(c));
• Residential split-custody arrangement (RCW 26.19.075(1)(d)).

7.3 Post-Secondary Support. The Court should reserve jurisdiction to determine post-secondary educational support under RCW 26.19.090.


8. ENFORCEMENT & REMEDIES

8.1 Wage Garnishment. The amended order shall constitute a mandatory wage assignment instrument. Non-compliance subjects the obligor to all remedies under Wash. Rev. Code ch. 26.18, including but not limited to:
a. Certified judgment liens;
b. License suspension;
c. Contempt sanctions and incarceration.

8.2 Interest & Penalties. Unpaid support shall accrue interest at twelve percent (12 %) per annum, compounded annually, or the statutory rate then in effect.

8.3 Attorneys’ Fees. The prevailing party in any enforcement action is entitled to reasonable attorneys’ fees and costs.


9. REPRESENTATIONS AND WARRANTIES

9.1 Accuracy of Information. Petitioner warrants that all financial data supplied herein and in accompanying Worksheets is true, correct, and complete to the best of Petitioner’s knowledge.

9.2 Duty to Supplement. Petitioner covenants to promptly supplement disclosures should material inaccuracies be discovered.

9.3 Survival. The representations in Section 9 survive entry of the amended child support order.


10. GENERAL PROVISIONS

10.1 Amendment & Waiver. Any waiver or modification of these requests must be in writing and approved by the Court.

10.2 Severability. If any portion of the amended order is found unenforceable, the remaining provisions shall remain in full force.

10.3 Integration. This Petition, along with the Exhibits, constitutes the complete statement of relief sought; prior oral statements are merged herein.

10.4 Electronic Signatures. Signatures transmitted electronically or by facsimile shall be deemed originals for all purposes.


11. VERIFICATION

I, [PETITIONER NAME], certify under penalty of perjury under the laws of the State of Washington that the foregoing statements are true and correct to the best of my knowledge.

Date: [DATE]
Place: [COUNTY], Washington

__________________________________
[PETITIONER NAME]
Petitioner


12. CERTIFICATE OF SERVICE

I certify that on [DATE], I caused a true and correct copy of this Petition and all supporting documents to be served on Respondent by:
☐ Personal service via [PROCESS SERVER]
☐ First-class mail, postage prepaid, to [ADDRESS]
☐ Other: [DESCRIBE]

__________________________________
[SERVER NAME & TITLE]


13. SIGNATURE BLOCK

Prepared by:

__________________________________
[ATTORNEY NAME], WSBA No. [___]
Attorney for Petitioner
[LAW FIRM NAME]
[ADDRESS] | [PHONE] | [EMAIL]


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Family law covers the paperwork that shapes divorce, custody, child support, adoption, guardianship, and other family matters. These filings are emotional and high-stakes, and they also have to meet strict procedural rules for service, financial disclosure, and parenting plans. Clean, accurate paperwork keeps the focus on getting a workable outcome for the family instead of getting derailed by technical problems that delay hearings or force amended filings.

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Last updated: May 2026

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