Child support in Washington is more formula than argument. That is genuinely good news, because it means the answer is largely predictable once the inputs are correct — and it means most real disputes are about the inputs, not about fairness in the abstract.
Those inputs are where cases are won and lost: what counts as income, whether a parent is voluntarily underemployed, how self-employment income is calculated, how day care and health insurance are shared, and whether a deviation is justified.
We help Spokane parents establish support orders, correct calculations that are wrong, seek and defend modifications, and deal with enforcement.
How is child support calculated in Washington?
Washington uses an income shares model under RCW 26.19 — the idea being that a child should receive roughly the same proportion of parental income as if the household were intact. The steps are:
- Determine each parent's gross monthly income from all sources
- Subtract allowed deductions to reach net income — including taxes, mandatory retirement, and (as of 2026) Washington Paid Family and Medical Leave and WA Cares premiums
- Add both parents' net incomes to get combined monthly net income
- Look that figure up on the state economic table for the number of children — this is the basic support obligation
- Divide that obligation between the parents in proportion to each parent's share of the combined income
- Add each parent's proportional share of health care, day care, and other special child-rearing expenses
| Step | What happens |
|---|---|
| 1. Gross income | Each parent's gross monthly income from all sources is determined |
| 2. Net income | Allowed deductions are subtracted — taxes, mandatory retirement, and from 2026, PFML and WA Cares premiums |
| 3. Combined income | Both parents' net incomes are added together |
| 4. Economic table | The combined figure and number of children produce the basic support obligation |
| 5. Proportional split | The obligation is divided in proportion to each parent's share of the combined income |
| 6. Add-ons | Each parent's proportional share of health care, day care and special child-rearing expenses is added |
Every order must show both the standard calculation and the amount actually ordered, with written reasons for any deviation.
Courts must use the official Administrative Office of the Courts worksheets, and every order must show both the standard calculation and the amount actually ordered, with written reasons for any deviation.
What changed in Washington child support in 2026?
Washington made its most significant child support changes in decades through Engrossed House Bill 1014. If your order predates 2026, this matters to you:
- The economic table now runs up to $50,000 in combined monthly net income, replacing the old $12,000 ceiling — above which courts previously had to extrapolate, producing inconsistent results across counties
- The low-income threshold rose from $1,000 to $2,200 of combined monthly net income
- The self-support reserve increased from 125% to 180% of the federal poverty guideline for a one-person household, protecting more low-income paying parents
- Paid Family and Medical Leave and WA Cares premiums became deductible in the calculation
| What changed | Before 2026 | From 1 January 2026 |
|---|---|---|
| Economic table ceiling | Combined monthly net income up to $12,000 | Combined monthly net income up to $50,000 |
| Above the ceiling | Courts extrapolated, producing inconsistent results between counties | The table itself applies, so results are consistent statewide |
| Low-income threshold | $1,000 combined monthly net income | $2,200 combined monthly net income |
| Self-support reserve | 125% of the federal poverty guideline (one person) | 180% of the federal poverty guideline (one person) |
| Presumptive minimum | Applied under the older schedule | $50 per child per month |
| New deductions from income | Not available | Paid Family and Medical Leave and WA Cares premiums |
| Amounts between $2,200 and $12,000 | Existing amounts | Unchanged |
Existing orders do not update automatically. A parent must petition for modification for the new table to apply — higher-income families previously above the old $12,000 ceiling are the most likely to see a meaningful difference.
Two important caveats. Amounts for combined incomes between $2,200 and $12,000 were not changed. And existing orders do not update automatically — a parent has to petition for modification for the new table to apply.
What do parents actually dispute in child support cases?
Imputed income
When a parent is voluntarily unemployed or underemployed, the court can impute income based on work history, education, and earning capacity rather than accepting a convenient paycheck. Proving — or disproving — voluntary underemployment is one of the most common fights in a support case.
Self-employment and variable income
Business owners, contractors, and commission earners require a closer look at what is genuinely a business expense versus a personal benefit run through the business. Bonuses and overtime raise questions about which years to average.
Deviations
The standard amount can be adjusted for reasons including substantial residential time with the paying parent, children from other relationships, or extraordinary income or debt. Deviations must be justified in writing, and courts do not grant them casually.
Residential credit
When the parent paying support has the children for a substantial share of overnights, a credit may reduce the transfer amount. Near-equal schedules with similar incomes can reduce support significantly — though it is not automatic.
Can I modify a child support order?
Support orders are not permanent. A parent can seek modification when circumstances change substantially — a job loss, a significant income change, a change in the residential schedule, or a child's changing needs. The 2026 schedule change itself may support recalculation for orders based on the old table, particularly for families above the old $12,000 cap. Until a court enters a new order, the existing one remains fully enforceable, so a parent whose income drops should file promptly rather than simply paying less.
What happens if child support is not paid?
Washington enforces support aggressively, through the courts and through the Division of Child Support. The corresponding point for paying parents: withholding support because of a parenting plan dispute is never the right move — the obligations are legally independent of each other.
| Enforcement tool | What it does |
|---|---|
| Wage garnishment | Support is withheld directly from the paying parent's pay |
| Tax refund interception | State and federal refunds are applied to arrears |
| License suspension | Driver's, professional and recreational licenses can be suspended |
| Property liens | Liens are placed against real estate and other property |
| Passport denial | Passport applications can be refused where arrears are substantial |
| Contempt proceedings | Court sanctions, including jail in persistent cases |
The corresponding point for paying parents: withholding support because of a parenting plan dispute is never the right move. The two obligations are legally independent.
How long does child support last in Washington?
Basic child support generally continues until a child turns eighteen or graduates from high school, whichever is later. Washington is also one of a minority of states where a court can order post-secondary support toward college expenses — but it is a separate request governed by its own standards, and it is not automatic. It generally must be sought before the existing support obligation ends, which is a deadline parents miss.
Frequently asked questions
How is child support calculated in Washington?
Both parents' monthly net incomes are combined and applied to the state economic table for the number of children, producing a basic support obligation that is split in proportion to each parent's income, plus proportional shares of health care and day care costs.
Did Washington child support change in 2026?
Yes. Effective January 1, 2026, the economic table expanded to cover combined monthly net income up to $50,000, the self-support reserve rose to 180% of the federal poverty guideline, and the low-income threshold increased to $2,200. Amounts between $2,200 and $12,000 were unchanged.
Will my existing order update automatically under the new law?
No. You must petition the court for a modification to have support recalculated under the new table. Higher-income families previously above the old $12,000 cap are the most likely to see a meaningful difference.
Can I get support lowered if I lose my job?
You can seek a modification, and you should file quickly — the existing order stays enforceable and arrears accrue until a court changes it. Be prepared to show the loss was not voluntary, or the court may impute income to you.
Does 50/50 parenting time mean no child support?
Not necessarily. Equal residential time can support a residential credit and may reduce or eliminate a transfer payment, but where incomes differ significantly the higher earner often still pays.
Can we agree to no child support?
Courts scrutinize such agreements closely, because the right belongs to the child rather than the parents. Any agreed deviation must be justified and must still meet the child's basic needs, so have it reviewed before you rely on it.
Ready to talk through your situation?
Reach a Schwab Law attorney in Spokane today.