Back child support in Washington is past-due child support, called arrears, that a parent owes after missing court-ordered payments. Washington charges 12% annual interest on unpaid arrears under Wash. Rev. Code § 26.23.030, and the Division of Child Support (DCS) enforces collection through wage garnishment, license suspension, tax intercepts, and passport denial for debts over $2,500. A child support judgment remains enforceable for 10 years after the youngest child turns 18, meaning Washington can collect back child support until that child reaches age 28.
Key Facts: Back Child Support in Washington
| Factor | Washington Rule |
|---|---|
| Interest Rate on Arrears | 12% per year (Wash. Rev. Code § 26.23.030) |
| Statute of Limitations | 10 years after youngest child turns 18 (until age 28) (Wash. Rev. Code § 4.56.210) |
| Enforcement Agency | Division of Child Support (DCS), part of DSHS |
| Passport Denial Threshold | More than $2,500 in arrears (federal) |
| License Suspension Threshold | 6 months past due or 6 months owed |
| Retroactive Reduction | Not allowed for installments before filing (Wash. Rev. Code § 26.09.170) |
| DCS Contact | 1-800-442-KIDS (5437) |
| Enforcement Cost | Free through DCS |
What Is Back Child Support in Washington?
Back child support in Washington is the total of unpaid, court-ordered child support payments that have accumulated over time, legally defined as arrears. When a parent misses a monthly payment, that amount becomes a debt that does not disappear. Under Wash. Rev. Code § 26.23.030, this past due child support accrues 12% annual interest, compounding the total a parent owes.
Washington treats child support arrears as a money judgment, giving them the same legal weight as any court-ordered debt. The Division of Child Support, a branch of the Department of Social and Health Services (DSHS), tracks every payment through the Washington State Support Registry. This centralized system calculates interest, records balances, and triggers automatic enforcement when payments fall behind. A parent who falls $5,000 behind on child support accumulates roughly $600 in interest during the first year alone, on top of the ongoing monthly obligation. Because interest compounds, the child support debt grows steadily until the parent satisfies both the principal arrears and accrued interest.
How Much Interest Does Back Child Support Accrue in Washington?
Back child support in Washington accrues interest at 12% per year, one of the highest statutory rates in the nation. Under Wash. Rev. Code § 26.23.030, the Division of Child Support may assess and collect 12% annual interest on unpaid child support that has accrued under any support order entered into the state support registry. This rate applies unless the original support order specifies a different interest rate.
The 12% interest rate makes Washington child support debt expensive to carry. Consider a parent who owes $10,000 in past due child support: that balance generates $1,200 in interest during a single year if left unpaid. Over five years, the interest alone can exceed $6,000 before accounting for compounding. DCS does not always automatically assess interest on every order. The agency does not assess or collect interest on Washington administrative or court orders unless the interest amount has been reduced to a judgment. For out-of-state orders, DCS assesses interest as provided in Washington Administrative Code 388-14A-7110. Parents who dispute their arrears balance or believe interest was miscalculated can request a case review by contacting DCS at 1-800-442-KIDS (5437).
How Long Can Washington Collect Back Child Support?
Washington can collect back child support for 10 years after the youngest child named in the order turns 18, meaning the debt remains enforceable until that child reaches age 28. Under Wash. Rev. Code § 4.56.210, a child support judgment or judgment lien stays in force for this extended period, giving custodial parents and DCS a long window to pursue collection.
This statute of limitations operates differently from most debt limits. Washington courts treat Wash. Rev. Code § 4.56.210 as a nonclaim statute rather than a true statute of limitations, which affects how the deadline applies to child support arrears. The time limit can also be extended or waived: under Wash. Rev. Code § 74.20A.220, a parent may waive any statute that would otherwise bar or impair collection of the child support debt. Washington courts retain continuing jurisdiction over support orders until all support duties, including arrearages, have been fully satisfied. This means a parent cannot escape child support debt simply by waiting for children to grow up. The owed child support, plus accumulated 12% interest, remains collectible for years after the support obligation itself ends.
How Does Washington Enforce Back Child Support?
Washington enforces back child support through the Division of Child Support, which uses administrative tools that require no court hearing, including wage garnishment, tax refund intercepts, bank levies, and license suspension. DCS provides free enforcement and reports arrears over $2,500 to federal authorities weekly, triggering passport denial. These tools operate automatically once a parent falls behind.
DCS deploys a layered enforcement system to collect past due child support. After a grace period on a late payment ends, DCS automatically attempts wage garnishment, deducting payments directly from the paying parent's wages, unemployment benefits, or Paid Family and Medical Leave benefits (up to 50%). The agency intercepts both federal and state tax refunds and can freeze and seize funds through bank levies when arrears reach certain thresholds. DCS also places property liens on real estate and vehicles, reports the debt to credit bureaus, and coordinates with banks to identify accounts tied to delinquent parents. Courts handle stronger measures for complex cases involving hidden income, self-employment, or willful nonpayment, using contempt proceedings, money judgments, and asset collection that DCS administrative tools cannot reach.
Common DCS Collection Methods
- Wage garnishment (income withholding) from paychecks and benefits
- Federal and Washington state tax refund interception
- Bank account levies and fund seizure
- Property liens on real estate and vehicles
- Credit bureau reporting affecting credit scores
- Driver's, professional, hunting, and fishing license suspension
- Passport denial for arrears exceeding $2,500
- Withholding up to 50% of Paid Family and Medical Leave benefits
Can Washington Suspend Your License for Back Child Support?
Washington can suspend nearly any state-issued license for back child support when a parent is at least 6 months behind or owes 6 months' worth of payments. The Division of Child Support has authority to suspend driver's licenses, professional licenses, business licenses, occupational licenses, and recreational hunting and fishing licenses until the parent makes acceptable payment arrangements.
License suspension is one of the most disruptive enforcement tools because it can prevent a parent from working and driving. Before suspension, DCS must send a Notice of Suspension, which it can issue when any of three conditions is met: the parent has not paid support in at least the last 6 months, the parent owes at least 6 months' worth of payments, or a court order specifies license loss for falling behind. The suspension is conditional and continues until the parent contacts DCS and establishes a payment plan. Because professional and commercial licenses are included, a contractor, nurse, or commercial driver who owes child support debt risks losing the ability to earn income. Parents facing a Notice of Suspension should contact DCS immediately at 1-800-442-KIDS to negotiate a payment arrangement and avoid the suspension taking effect.
Can You Lose Your Passport for Owing Child Support in Washington?
Yes, you can lose your passport for owing child support in Washington when your arrears exceed $2,500. This federal enforcement mechanism, triggered through the U.S. Department of State, prevents both new passport issuance and renewal until you pay the back child support debt in full. The threshold applies nationwide under federal law.
The passport denial process works through federal-state coordination. Washington's Division of Child Support reports child support debt weekly to the federal Office of Child Support Services (OCSS), which maintains the national database used for federal enforcement. When a parent's arrears exceed $2,500, DCS includes that parent's name in the weekly transmission to OCSS, which forwards certifications to the State Department for inclusion in the Consular Lookout and Support System (CLASS). Once certified, the parent cannot obtain or renew a U.S. passport. Restoring passport eligibility requires paying the existing arrears in full, not simply entering a payment plan. This makes passport denial a powerful collection tool for parents who owe substantial child support and need to travel internationally for work or family reasons.
Can Back Child Support Be Reduced or Forgiven in Washington?
Back child support in Washington generally cannot be retroactively reduced or forgiven once it accrues. Under Wash. Rev. Code § 26.09.170, a court can modify child support only as to installments accruing after the modification petition is filed. Past-due installments that accumulated before the filing date remain legally owed regardless of any later modification.
This rule creates significant financial consequences for parents who delay filing for modification. If a parent loses income but waits months to file, all the support that accrued during that delay remains due at the original amount. A Washington child support order can be modified when there has been a substantial change in circumstances, or simply because at least 24 months have passed since the last order, based on income changes or the updated economic table. However, the modification only affects future payments. To request a change, a parent files a Petition to Modify Child Support Order or a Motion for Adjustment in the superior court of the county where the order was issued. While the principal arrears generally cannot be forgiven, the custodial parent who is owed the debt may voluntarily agree to compromise arrears in some circumstances, and DCS can negotiate payment arrangements on the accumulated balance.
Modification vs. Arrears: What Changes and What Doesn't
| Item | Can It Be Reduced? |
|---|---|
| Future child support payments | Yes, with substantial change or after 24 months |
| Arrears accrued before filing | No, generally fixed and owed |
| Interest already accrued (12%) | No, unless reduced to judgment and compromised |
| Effective date of modification | Date of filing, not the date circumstances changed |
| Arrears owed to the state | Sometimes, through DCS negotiation |
How Do You File for Child Support Modification in Washington?
You file for child support modification in Washington by submitting a Petition to Modify Child Support Order or a Motion for Adjustment in the superior court of the county where the original order was issued. Filing fees vary by county and are set under Wash. Rev. Code § 36.18.020; no fee is charged when the State of Washington brings the action on a parent's behalf.
The modification process protects parents whose financial circumstances have genuinely changed. Under Wash. Rev. Code § 26.09.170, all child support decrees may be adjusted once every 24 months based on changes in either parent's income without proving substantially changed circumstances. Either party initiates the adjustment by filing a motion along with completed child support worksheets. Venue is proper in the superior court of the county where the dependent child resides, where the obligor or obligee lives, or where the prior support order was entered. Because the modification takes effect only from the filing date, parents should file as soon as an income change appears likely to be ongoing. Filing fees for private parties typically range from approximately $30 to $260 depending on the county and motion type. As of June 2026, verify the exact filing fee with your local superior court clerk, as fee schedules are updated periodically and indigency-based fee waivers are available for qualifying parents.
What Happens If You Refuse to Pay Back Child Support in Washington?
A parent who willfully refuses to pay back child support in Washington can face contempt of court, which may result in jail time, and in extended cases, criminal charges. Courts use contempt as a last resort after administrative tools fail, while DCS continues garnishing wages, suspending licenses, and seizing assets to collect the past due child support debt.
Washington reserves its strongest enforcement for parents who have the ability to pay but willfully refuse. Courts can hold a non-paying parent in contempt, and although jail is typically a last resort, incarceration is available when wage garnishment, license suspension, and other tools fail to produce payment. If nonpayment persists for an extended period, the state can bring criminal charges against the parent. Importantly, contempt requires a finding that the parent had the ability to pay and chose not to, which protects parents who genuinely cannot afford payments. For incarcerated parents, the updated statute effective April 1, 2027 allows a support obligation to be abated to $10 per month per order during incarceration under Wash. Rev. Code § 26.09.320. Parents who cannot pay should never simply stop paying; instead, they should immediately contact DCS and file for modification to reduce future obligations before arrears accumulate.