How to Use the Washington Child Support Calculator (2026 Guide)

Washington State calculates child support using the Income Shares Model under RCW 26.19, which estimates the amount both parents would spend on their children if the household were intact and divides that obligation proportionally based on each parent's net income. As of January 1, 2026, Engrossed House Bill 1014 expanded the economic table to cover combined monthly net incomes up to $50,000, raised the self-support reserve from 125% to 180% of the federal poverty level, and increased the low-income threshold from $1,000 to $2,200. The official Washington State Child Support Schedule (WSCSS) calculator, maintained by the Division of Child Support (DCS), is available online and produces court-ready worksheets that judges rely on to set support orders across all 39 Washington counties.

What Is the Washington Child Support Calculator?

The Washington child support calculator is an online tool provided by the Department of Social and Health Services (DSHS) that generates official Washington State Child Support Schedule (WSCSS) worksheets based on both parents' incomes, the number of children, and additional expenses such as health insurance and daycare. Washington courts in all 39 counties rely on these worksheets when establishing, modifying, or enforcing child support orders under RCW 26.19.035.

The WSCSS calculator applies the Income Shares Model, which is used by 41 states nationwide. Under this model, both parents' monthly net incomes are combined, and the economic table in RCW 26.19.020 specifies a base support obligation based on the combined income and the number of children. Each parent then pays their proportional share of that base amount. For example, if Parent A earns 60% of the combined income, Parent A is responsible for 60% of the base support obligation.

Washington provides two versions of the calculator. The Quick Estimator at the DSHS website gives a rough monthly figure in under 60 seconds. The full WSCSS Worksheet Calculator produces the detailed, court-ready worksheets that attorneys and judges use during dissolution proceedings. Two-parent families use WSCSS Worksheets 2, while families with three legal parents use WSCSS Worksheets 3. Both versions were updated on January 2, 2026, to reflect the changes enacted by Engrossed House Bill 1014.

What Changed in Washington Child Support Law for 2026?

Washington enacted sweeping child support reforms through Engrossed House Bill (EHB) 1014, effective January 1, 2026, representing the most significant overhaul to the state's child support schedule in over a decade. These changes affect every new and modified child support order entered on or after that date, expanding the economic table from $12,000 to $50,000 in combined monthly net income and raising the self-support reserve from 125% to 180% of the federal poverty level.

The four major changes under EHB 1014 are:

1. Economic Table Expansion: The child support economic table in RCW 26.19.020 now covers combined monthly net incomes from $2,200 to $50,000. Previously, the table capped at $12,000, requiring judges to exercise broad discretion for higher-income families. For incomes between $2,200 and $12,000, the support amounts remain unchanged from the prior table. For incomes above $12,000, new amounts are calculated using a formula based on economic data rather than historical spending studies.

2. Low-Income Threshold Increase: The minimum combined monthly net income threshold rose from $1,000 to $2,200. Families earning below $2,200 combined are now subject to the $50 per child per month minimum obligation under RCW 26.19.065, providing greater protection for low-income obligors.

3. Self-Support Reserve Increase: The self-support reserve, which is the amount a paying parent must retain after meeting their child support obligation, increased from 125% to 180% of the federal poverty level for a one-person household. In 2026, this means a paying parent must retain approximately $2,019 per month (180% of the 2025 federal poverty guideline of $1,255 per month for a single person) before any support obligation applies.

4. New Income Deductions: Parents may now deduct Washington Paid Family and Medical Leave (PFML) premiums and WA Cares Fund premiums from gross income when calculating net income. Previously, these state-mandated deductions were not explicitly permitted under the child support schedule. Educational expenses have also been removed from the economic table.

How Do You Calculate Child Support in Washington Step by Step?

Washington child support is calculated through a six-step process using the WSCSS worksheets prescribed by RCW 26.19.035, beginning with gross income determination for each parent and ending with a transfer payment amount. The entire calculation can be completed using the online child support calculator Washington provides through DSHS, or manually using the PDF worksheets available from the Washington Courts website.

Step 1 — Determine Gross Monthly Income: List all income sources for each parent, including wages, salary, commissions, bonuses, self-employment income, interest, dividends, rental income, retirement benefits, and any other source listed in RCW 26.19.071(3). If a parent is voluntarily unemployed or underemployed, the court may impute income based on that parent's work history, education, and local job market conditions under RCW 26.19.071(6).

Step 2 — Calculate Monthly Net Income: Subtract allowable deductions from each parent's gross income. Permitted deductions include federal and state income taxes, FICA (Social Security and Medicare), mandatory pension contributions, union dues, state industrial insurance premiums, mandatory employer-required professional expenses, and as of 2026, PFML and WA Cares Fund premiums. The result is each parent's monthly net income.

Step 3 — Combine Net Incomes: Add both parents' monthly net incomes together. For the 2026 economic table, the combined amount must fall between $2,200 and $50,000. If combined income falls below $2,200, the minimum obligation of $50 per child per month applies. If combined income exceeds $50,000, the court exercises discretion for the amount above that threshold.

Step 4 — Find the Basic Support Obligation: Using the combined monthly net income and the number of children, locate the basic support obligation on the economic table in RCW 26.19.020. For one child at a combined income of $5,000 per month, the 2026 table specifies a basic obligation of approximately $867. For two children at $5,000 combined, the obligation rises to approximately $1,283.

Step 5 — Allocate Each Parent's Share: Divide each parent's net income by the combined net income to determine their proportional share. Multiply each parent's percentage by the basic support obligation. If Parent A earns $3,000 (60%) and Parent B earns $2,000 (40%) of a $5,000 combined income, Parent A's share of an $867 one-child obligation is $520, and Parent B's share is $347.

Step 6 — Add Health Care, Daycare, and Special Expenses: Health insurance premiums for the children, work-related daycare costs, and long-distance transportation costs for visitation are added to the basic obligation and shared proportionally between the parents under RCW 26.19.080. The total support obligation equals the basic obligation plus these additional expenses.

What Income Counts for Washington Child Support?

Washington courts include virtually all income sources when calculating child support under RCW 26.19.071(3), counting salaries, wages, tips, commissions, bonuses, self-employment earnings, interest, dividends, rental income, trust income, Social Security benefits, workers' compensation, unemployment benefits, pension income, annuities, and spousal maintenance received from any source. The Washington child support calculator requires accurate reporting of all income categories to produce a reliable estimate.

Income that is excluded from the Washington child support calculation includes income of new spouses or domestic partners (the new partner's income is not considered), child support received for other children, public assistance benefits (TANF, SSI), and income specifically excluded by court order. Under RCW 26.19.071(4), the court may impute income to a parent who is voluntarily unemployed or voluntarily underemployed, based on that parent's work history, qualifications, and prevailing earnings in the community.

Allowable deductions from gross income for the 2026 child support worksheet include:

• Federal income taxes (at the filing rate for the actual number of dependents)
• State income taxes (Washington has no state income tax, so this is $0)
• FICA contributions (Social Security at 6.2% up to the 2026 wage base; Medicare at 1.45%)
• Mandatory pension plan contributions
• Union or professional dues required as a condition of employment
• State industrial insurance premiums (L&I)
• Court-ordered spousal maintenance actually paid
• Normal business expenses for self-employed parents
• PFML premiums (new for 2026 under EHB 1014)
• WA Cares Fund premiums (new for 2026 under EHB 1014)

Washington does not impose a state income tax, which means Washington parents have higher net incomes compared to parents in the 43 states that levy a state income tax. The child support calculator Washington provides accounts for this automatically when generating WSCSS worksheets.

When Can a Washington Court Deviate from the Standard Calculation?

Washington courts may deviate from the standard child support calculation under RCW 26.19.075 when specific factors make the standard amount unjust or inappropriate, but the court must enter written findings explaining the reasons for any deviation. Common deviation factors include income below the self-support reserve of 180% of the federal poverty level (approximately $2,019 per month in 2026), income above the $50,000 combined monthly cap, and shared or extended residential time exceeding 25% with the non-custodial parent.

The statutory grounds for deviation listed in RCW 26.19.075(1) include:

• Sources of income and tax planning that reduce the parent's available income
• Nonrecurring income (inheritance, personal injury settlement)
• Debt and high expenses not voluntarily incurred
• Residential schedule allowing significantly more time with the non-custodial parent
• Children from other relationships (the whole family method)
• Special needs of disabled children
• Special medical, educational, or psychological needs of the children
• Costs for reunification efforts under chapter 13.34 RCW
• Significant disparity in living costs beyond the parents' control
• Property and financial resources available to the child

The residential schedule deviation is particularly important in Washington. When the child spends more than 25% of overnights (91 or more nights per year) with the parent who would otherwise pay support, the court may reduce the obligation to account for the direct expenses that parent incurs during residential time. Many Washington family law practitioners refer to this as the "shared parenting adjustment," although the statute does not use that term. The court calculates the adjustment using the WSCSS worksheets, which have a dedicated section for residential schedule credits.

How Do You Use the Official WSCSS Online Calculator?

The official Washington State child support calculator is located at fortress.wa.gov/dshs/dcs/SSGen/Home, maintained by the Division of Child Support within DSHS, and updated as of January 2, 2026, to reflect all EHB 1014 changes including the expanded $50,000 economic table and the 180% self-support reserve. Using this child support estimator takes approximately 15-20 minutes if you have both parents' financial documents ready.

To use the Washington child support calculator effectively, gather the following documents before starting:

• Last 3 months of pay stubs for both parents (to calculate gross monthly income)
• Most recent federal tax return for both parents (for verification of all income sources)
• Monthly health insurance premium amounts for the children
• Monthly work-related daycare costs
• Any court-ordered spousal maintenance payments
• Documentation of other children from different relationships

The calculator walks users through each section of the WSCSS worksheet:

1. Enter each parent's gross monthly income from all sources
2. Enter allowable deductions (taxes, FICA, mandatory pension, union dues, PFML, WA Cares)
3. The calculator computes monthly net income for each parent and combined net income
4. Enter the number of children covered by the order
5. The system looks up the basic support obligation from the 2026 economic table
6. Enter children's health insurance premiums and daycare costs
7. Enter the residential schedule (number of overnights with each parent)
8. The calculator applies any applicable credits or adjustments
9. Review the completed WSCSS worksheet showing each parent's support obligation

The calculator generates a PDF worksheet that can be filed directly with the court. Washington Superior Courts require the completed WSCSS worksheet to accompany any petition for dissolution, legal separation, or parentage action that includes a request for child support under RCW 26.19.035.

How Do You Modify an Existing Child Support Order in Washington?

Washington allows modification of child support orders under RCW 26.09.170 upon a showing of substantial change in circumstances, defined as a change that would alter the support obligation by at least 25% or $50 per month, whichever is greater. As of 2026, many existing orders entered under the old economic table may qualify for modification based solely on the updated support schedule enacted by EHB 1014.

There are three pathways to modify a Washington child support order:

1. Substantial Change of Circumstances: A parent must demonstrate that circumstances changed materially since the original order. Examples include job loss, significant income increase or decrease, a child's changed needs (medical, educational), or relocation. Voluntary unemployment or underemployment alone does not qualify as a substantial change under RCW 26.09.170(7)(a).

2. 24-Month Adjustment: If 24 months have passed since the order was entered or last modified, either parent may request a modification without proving a substantial change, based solely on changes in income or changes to the economic table or standards in RCW 26.19. This pathway is particularly relevant in 2026 because the EHB 1014 changes to the economic table may produce different support amounts even when incomes have not changed.

3. Severe Economic Hardship: An order may be modified at any time if it causes severe economic hardship to either parent or the child, without meeting the 24-month waiting period.

To file a modification petition, the filing fee ranges from $36 to $60 depending on the county. The Division of Child Support (DCS) can also initiate a review and adjustment of support orders it administers at no cost to either parent. Parents can request a DCS review by contacting their local DCS office or calling 1-800-442-KIDS (5437).

What Happens If a Parent Does Not Pay Child Support in Washington?

Washington enforces child support orders aggressively through the Division of Child Support (DCS), which has statutory authority under RCW 26.23 to use income withholding, license suspension, bank levies, tax refund interception, and contempt proceedings to collect unpaid support. Washington collected over $784 million in child support during federal fiscal year 2023, ranking among the top 15 states nationally for collection rates.

Enforcement tools available in Washington include:

• Automatic income withholding: All Washington child support orders include an automatic income withholding provision under RCW 26.23.060. Employers must withhold support from the obligor's paycheck and remit it to the Washington State Support Registry (WSSR) within 7 business days.
• License suspension: DCS can suspend driver's licenses, professional licenses, and recreational licenses (hunting, fishing) for parents who are $2,500 or more in arrears or who have failed to comply with a payment plan.
• Bank account levies: DCS can seize funds from bank accounts with 30 days' advance notice.
• Tax refund interception: Both federal and state tax refunds can be intercepted and applied to arrears.
• Passport denial: The federal government denies passport applications for parents owing $2,500 or more.
• Contempt of court: The custodial parent or DCS can file a motion for contempt, which can result in fines or incarceration of up to 180 days under RCW 26.09.160.
• Credit reporting: Arrears of $1,000 or more are reported to credit bureaus.

Washington charges 12% annual interest on past-due child support under RCW 26.23.060, compounding the total owed. A parent who falls $5,000 behind accumulates $600 in interest per year on top of the ongoing monthly obligation. The child support calculator Washington provides does not calculate arrears or interest, so parents in enforcement situations should contact DCS directly.

How Does the Washington Child Support Calculator Handle Shared Custody?

The Washington child support calculator accounts for shared residential time through a credit system built into the WSCSS worksheets, reducing the transfer payment when the child spends more than 25% of overnights (91+ nights per year) with the parent who would otherwise pay support under the standard calculation in RCW 26.19.075(1)(d). Washington does not use a true "shared parenting formula" like some states; instead, shared time is treated as a deviation factor.

When entering residential schedule information into the child support estimator, you must specify the number of overnights each parent has with the child. The calculator uses this information as follows:

• 0-25% overnights with the paying parent (0-91 nights): No residential credit applies. The standard calculation determines the full support obligation.
• 25-50% overnights with the paying parent (91-182 nights): The court may apply a deviation credit. The credit is not automatic and requires the court to find that the deviation is appropriate under the totality of circumstances.
• 50/50 residential schedules (182-183 nights each): Both parents' obligations are calculated, and the parent with the higher income typically pays the difference between the two obligations to the other parent.

The residential credit calculation considers the direct costs each parent incurs (food, utilities, transportation) during their residential time. Washington courts have noted that many fixed costs (housing, insurance, clothing) do not decrease proportionally when a child spends more time with the other parent. For this reason, Washington courts may decline to apply a full proportional credit even when residential time is shared equally.

Frequently Asked Questions About Washington Child Support

Where is the official Washington child support calculator located?

The official Washington child support calculator is hosted by the Department of Social and Health Services at fortress.wa.gov/dshs/dcs/SSGen/Home. This WSCSS Worksheet Calculator was updated on January 2, 2026, to reflect Engrossed House Bill 1014 changes including the expanded $50,000 economic table and the increased 180% self-support reserve.

What is the minimum child support payment in Washington?

Washington sets a minimum child support obligation of $50 per child per month under RCW 26.19.065. This minimum applies when the obligor's income falls below the self-support reserve of 180% of the federal poverty level (approximately $2,019 per month in 2026). Even parents receiving public assistance owe the $50 minimum.

How did EHB 1014 change Washington child support in 2026?

Engrossed House Bill 1014, effective January 1, 2026, made four major changes: expanded the economic table from $12,000 to $50,000 combined monthly net income, raised the low-income threshold from $1,000 to $2,200, increased the self-support reserve from 125% to 180% of the federal poverty level, and added PFML and WA Cares Fund as allowable deductions from gross income.

Can I modify my child support order because of the 2026 law changes?

Yes. Under RCW 26.09.170, if 24 months have passed since your order was entered or last modified, you can request modification based on changes to the economic table or standards in RCW 26.19 without proving a substantial change of circumstances. The 2026 EHB 1014 changes to the table and self-support reserve qualify as such changes.

Does Washington consider a new spouse's income for child support?

Washington does not include a new spouse's or domestic partner's income in the child support calculation under RCW 26.19.071. The income of a parent's new partner is not added to that parent's gross income on the WSCSS worksheet. However, the court may consider that a new partner's contributions reduce the parent's living expenses when evaluating deviation requests.

How long does child support last in Washington?

Washington child support continues until the child turns 18 under RCW 26.09.100, or until age 19 if the child is still enrolled in high school and making progress toward graduation. Support may also terminate earlier upon the child's emancipation, marriage, or entry into military service. Washington does not automatically extend support through college, though parents can agree to college support in their settlement.

What happens if a parent is self-employed in Washington?

Self-employed parents in Washington must report gross receipts minus ordinary and necessary business expenses to determine net business income under RCW 26.19.071(3). The court scrutinizes deductions carefully and may disallow expenses that appear inflated or personal in nature. Depreciation, home office deductions, and vehicle expenses receive particular attention. The child support calculator Washington provides includes fields for self-employment income and deductions.

How do I get a fee waiver for filing child support in Washington?

Washington courts grant filing fee waivers to parents who receive public assistance (TANF, SSI, Medicaid, food stamps), whose household income falls below 200% of the federal poverty level, or who would face substantial hardship paying the fee. Parents must complete and file an Order Re: Filing Fees (form FL All Family 007) with the court clerk. Approximately 30% of family law filings in Washington receive some form of fee waiver.

Does the Washington child support calculator account for health insurance costs?

Yes. The WSCSS worksheets include a dedicated section for children's health insurance premiums under RCW 26.19.080. The cost of providing health insurance coverage for the children is added to the basic support obligation and shared proportionally between the parents based on their income percentages. Uninsured medical expenses exceeding $250 per child per year are also shared proportionally.

Can child support be calculated differently if parents agree?

Washington parents may agree to a child support amount that differs from the standard calculation, but the court must approve any agreement and enter written findings under RCW 26.19.075 explaining why the deviation is appropriate. The agreed amount cannot be unconscionably low. Courts will reject agreements that appear to sacrifice children's interests for other settlement concessions, and the WSCSS worksheet must still be completed and filed showing the standard calculation alongside the agreed amount.