Washington calculates child support using an income shares model, where both parents’ combined net income determines a base support amount from a state economic table, which is then divided between parents based on their share of that income.
The calculation is set out in Chapter 26.19 RCW, and a major update to the underlying economic table took effect January 1, 2026.
Parents going through a divorce in Spokane assume child support comes down to a simple percentage of income. It does not. Washington’s formula accounts for both parents’ earnings, the number of children, health insurance costs, and daycare expenses before arriving at a number either parent actually owes.
Key Takeaways About Washington Child Support Calculations
- Washington uses an income shares model, combining both parents’ net income to set a base support amount, then dividing it proportionally.
- The state’s economic table changed on January 1, 2026, expanding the income range it covers and adjusting the amount reserved for a paying parent’s own basic needs.
- Support calculations use net income, not gross income, after specific deductions allowed under Washington law.
- Add-on expenses like health insurance premiums and work-related daycare are split between parents in addition to the base support amount.
- A parent may ask a court to deviate from the standard calculation, but deviations require the court to state specific reasons in writing.
What Is the Income Shares Model?
The income shares model is the method Washington uses to calculate child support, based on the premise that a child should receive the same proportion of parental income they would have received if both parents lived in the same household. The model combines both parents’ net income into a single figure, then applies that figure to a state economic table.
Under RCW 26.19.020, the economic table lists a basic support obligation per child, based on combined net monthly income and the number of children in the case. Each parent pays a share of that base obligation matching their percentage of the total combined income.
What Changed in Washington’s 2026 Child Support Update?
Washington expanded its child support economic table effective January 1, 2026, raising the maximum combined income the table covers from $12,000 to $50,000 per month. This change came from Engrossed House Bill 1014, and it changes how support is calculated for higher-earning parents in particular.
Before this update, courts used their discretion once combined income passed $12,000 monthly, since the table did not go any higher. The updated table provides guidance up to $50,000 in combined monthly net income, which brings more predictability to cases that previously required a judge to extrapolate.
Other changes took effect at the same time:
- The self-support reserve, the amount a paying parent keeps for their own basic needs before support is calculated, increased from 125 percent to 180 percent of the federal poverty level for a one-person household.
- The minimum combined income threshold used in the schedule increased from $1,000 to $2,200 per month.
- New deductions became available for contributions to Washington’s Paid Family and Medical Leave program and the WA Cares long-term care trust.
These changes apply to new child support orders and to existing orders being modified on or after January 1, 2026. A support order calculated under the prior table does not update automatically, so a parent whose income sits near these thresholds should review whether the new figures change their obligation.
How Does Washington Determine Net Income for Child Support?
Washington determines net income for child support purposes by starting with a parent’s gross monthly income and subtracting specific allowed deductions, rather than using take-home pay directly. Standards for this calculation appear under RCW 26.19.035.
Gross income includes wages, salaries, commissions, bonuses, and most other regular income sources. From that figure, the calculation subtracts federal and state taxes, mandatory retirement contributions, and certain other deductions set by statute. What remains is the net income figure used in the economic table.
Self-employed parents and parents with variable income, such as commission-based sales roles, see more disagreement at this stage. A parent’s tax return does not always reflect true available income for support purposes, particularly when business expenses reduce reported income without reducing actual spending power.
What Gets Added to the Base Support Amount?
Washington adds specific expenses on top of the base support calculation, most commonly a child’s health insurance premium and work-related daycare costs, and divides those expenses between parents proportionally. These add-ons are calculated separately from the basic support obligation shown on the economic table.
The most common add-on expenses in a Spokane child support case include:
- The portion of a health insurance premium that covers the child specifically
- Work-related or education-related daycare costs
- Uninsured medical, dental, or vision expenses beyond routine costs
- Extraordinary expenses tied to a child’s specific needs, such as special education costs
Parents split these costs in the same proportion used for the base support calculation, though a court may adjust that split depending on the circumstances of the case.
Can a Parent Ask the Court to Deviate From the Standard Calculation?
A parent may ask a Washington court to deviate from the standard child support calculation, but the court must state specific written reasons for approving or denying that request. A deviation requires a legal basis recognized under Washington’s child support statutes.
Reasons a court may consider for a deviation include:
- Significant wealth or income of either parent beyond what the standard calculation reflects
- A child spending substantial time with the paying parent beyond a standard visitation schedule
- Extraordinary income of a non-parent household member, in limited circumstances
- Special needs of the child that the base calculation does not address
A parent should not assume a deviation will be granted simply because the standard calculation feels high or low relative to their situation. Courts apply these factors narrowly, and the written findings requirement means a judge has to explain, on the record, why the standard number does not fit the case.
How Does This Connect to a Spokane Divorce or Custody Case?
Child support is established as part of a Washington divorce, and it also comes up in custody cases involving parents who were never married. The calculation runs on a separate worksheet from the property division or parenting plan portions of a case, but the numbers used in one affect the others.
When a residential schedule approaches a near-equal split between parents, parenting time directly affects the child support calculation. A parent evaluating a proposed parenting plan should understand how a shift in residential time changes the support number before agreeing to that schedule.
What Happens When a Parent Does Not Pay Court-Ordered Child Support?
A parent who does not pay court-ordered child support in Washington faces enforcement action through the Division of Child Support (DCS) or a direct contempt motion in Spokane County Superior Court. Nonpayment does not resolve itself, and the amount owed continues to accrue as a legal debt regardless of the reason for the missed payments.
DCS has enforcement tools available without either parent going back to court for each step. These tools include wage withholding directly from the paying parent’s paycheck, intercepting state and federal tax refunds, and suspending a driver’s license or professional license tied to the state. A passport denial is also available for cases with a significant arrears balance.
Parents can also file a contempt motion directly with the court when DCS enforcement is not involved or has not resolved the nonpayment. A contempt finding can result in a judgment for the unpaid amount, an order to pay attorney fees, and, in cases of repeated willful nonpayment, jail time.
The following enforcement actions come up most often in Spokane cases:
- Wage withholding orders sent directly to an employer
- Interception of state and federal tax refunds
- Suspension of a driver’s license or occupational license
- A contempt motion resulting in a judgment for back-owed support
A parent facing a genuine hardship, such as a job loss, should request a modification rather than simply stopping payments. Unpaid support does not decrease on its own even when a parent’s income drops, and arrears continue to accrue at the original court-ordered amount until a modification is entered.
Does Child Support End When a Child Turns 18 in Washington?
Child support in Washington ends when a child turns 18, unless the child is still enrolled in high school, in which case support continues until graduation or age 19, whichever comes first. A support order does not automatically terminate the day a child reaches 18 if that condition applies.
Support may also extend beyond age 18 when a court orders postsecondary support for education expenses, such as college tuition, under a separate statutory standard. Postsecondary support requires a specific request and a court’s approval based on factors including the child’s aptitude and each parent’s financial ability to contribute.
FAQ for How Is Child Support Calculated in Washington State
Does Washington cap child support at a certain income level?
No, Washington’s updated economic table covers combined monthly net incomes up to $50,000 as of January 1, 2026, and courts may exceed even that amount with written findings in unusual cases. There is no absolute cap on support in Washington.
Is child support based on gross income or net income in Washington?
Washington calculates child support based on net income, meaning gross income minus specific allowed deductions like taxes and mandatory retirement contributions. This differs from states that calculate support directly from gross pay.
Can child support be modified after the 2026 economic table change?
Yes, a parent may request a modification of an existing child support order to reflect the updated 2026 economic table, though a modification requires filing a request with the court rather than happening automatically. Whether a modification makes sense depends on how much the new table changes the calculated amount in a specific case.
What happens to child support if a parent becomes unemployed?
A parent’s unemployment can support a request to modify child support, though courts sometimes impute income based on a parent’s earning capacity if the unemployment appears voluntary. Documentation of a genuine, involuntary job loss strengthens a modification request.
Do both parents have to use the state’s online calculator?
No, parents are not required to use the online Washington State Child Support Schedule calculator, though courts and the Division of Child Support commonly reference the same worksheets it generates. An attorney or the parties themselves may complete the required worksheets manually using the same economic table.
Speak With a Spokane Child Support Attorney About Your Case
Washington’s child support formula involves more moving pieces than a quick online estimate captures, especially with the 2026 changes to the economic table now in effect.
Crouse Erickson works with Spokane parents on child support questions that arise during divorce, modification, and custody cases across our practice.
Call (509) 624-1380 to speak with a Spokane child support attorney about your specific numbers. Your consultation with Crouse Erickson is confidential.
