How is child support calculated in Washington?

Using the Washington State Child Support Schedule under RCW 26.19: after determining both parents' combined net monthly income, the court refers to the Economic Table to find the basic support obligation based on the number and ages of the children, then apportions it between the parents.

Is there a cap on the income used in the schedule?

The economic table is presumptive for combined monthly net incomes up to $12,000. Above that, the court can use its discretion to set higher support amounts, but must provide written findings explaining the decision.

Do I have to use official state worksheets?

Yes. Worksheets are official forms created by the Administrative Office of the Courts, not custom spreadsheets, and must be attached to the order or, if filed separately, initialed or signed by the judge and filed with the order.

How do I request a modification in Washington?

If your support is based on a court order, the modification request goes through the county prosecutor's office. You can also ask DCS to review your case for a possible modification.

Washington, United States

Washington Child Support: A Parent's Guide

Q: How is child support enforced in Washington?

Income withholding is mandatory for all orders entered or modified since January 1, 1994. If a parent falls behind, DCS sends a withholding order to the employer within 2 business days of learning of the delinquency, and the employer must start withholding within 7 business days. Washington allows garnishment of up to 50% of disposable income.

How child support works in Washington, in plain English: the state schedule, modification, and DCS enforcement.

Legal sources reviewed: August 10, 2026

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In short: Washington calculates child support from a statutory Economic Table based on combined net income and the number and ages of children, presumptive up to $12,000/month in combined income. Parties must use official state worksheets, not custom calculations, and enforcement runs through the Division of Child Support (DCS), which can act on a delinquency within days.

This is an educational overview written for parents, not lawyers. It isn't legal advice. For anything beyond general understanding, talk to a licensed Washington family law attorney.

What Washington generally provides

Under RCW 26.19, Washington's child support schedule encompasses the standards, economic table, worksheets, and instructions courts use statewide. After determining the parents' combined net monthly income, the court refers to the Economic Table (RCW 26.19.020) to find the basic support obligation based on the number and ages of the children.

Important terminology

Economic Table: Washington's statutory lookup table for the basic support obligation, based on combined net income and the children's number and ages.
Official worksheets: state-created forms (not custom spreadsheets) that must be used and filed with the order.
DCS: the Washington Division of Child Support, part of DSHS, responsible for enforcement and many modification reviews.

How the calculation works

Determining the basic obligation

The court combines both parents' net monthly income and looks up the corresponding figure in the Economic Table, which accounts for the number and ages of the children being supported, ages matter here in a way not every state's table reflects.

The presumptive income ceiling

The Economic Table is presumptive for combined monthly net incomes up to $12,000. Above that threshold, courts may use discretion to set a higher amount, but must provide written findings explaining that decision rather than simply extending the table.

Official worksheets only

Every child support order must show the standard calculation from the schedule, and then the actual amount ordered, with written reasons required for any deviation between the two. The worksheets themselves are official Administrative Office of the Courts forms, custom spreadsheets aren't a substitute, and they must be attached to or filed with the decree.

Requesting or defending a modification

If your support is based on a court order, the modification request goes through the county prosecutor's office. Parents can also ask DCS to review the case for a possible modification outside of a court filing. See the child support calculator and guideline finder for jurisdiction-specific calculation sources and guidance.

How enforcement works

Income withholding is mandatory for all orders entered or modified since January 1, 1994. When a parent falls behind, DCS sends an income withholding order to the employer within 2 business days of learning of the delinquency, and the employer must begin withholding within 7 business days of receiving it. Washington permits wage garnishment of up to 50% of an obligor's disposable income for child support. Beyond wage withholding, DCS uses other income withholding, medical support enforcement, IRS tax refund attachment, interstate referral, license revocation, personal property seizure, and referral for contempt or federal criminal non-support in serious cases. As of September 2025, DCS also began withholding up to 50% of Paid Family and Medical Leave (PFML) benefits from parents who owe support.

Common questions

Can I write my own calculation instead of using the state worksheet? No, courts require the official Administrative Office of the Courts worksheets; a custom spreadsheet isn't acceptable documentation for the order.

What if my income exceeds the $12,000 combined cap? The court has discretion to set support above the table's presumptive amount, but must explain its reasoning in writing rather than simply extrapolating the table.

What if my co-parent isn't paying? Contact DCS, which can move quickly on withholding once a delinquency is identified, along with other enforcement tools like license suspension or tax refund interception.

Practical considerations

Because Washington's Economic Table factors in the children's ages, not just their number, a calculation that ignores age brackets can be inaccurate, worth double-checking against the current table or a DCS review rather than relying on an old estimate. For the custody and parenting-plan rules that shape the underlying schedule, see the Washington custody guide.

Official Washington resources

FAQ

Questions, answered

This information is provided for educational purposes only and is not legal advice. Family law varies by individual circumstances and may change over time. Consult a qualified attorney or appropriate official resource for advice about your situation.