When Child Support Ends in Washington State

Child support in Washington ends when the child turns 18, graduates from high school, or dies — whichever happens first

Washington law sets a specific age and circumstance for child support to stop. The obligation ends on the child's 18th birthday unless the child is still in high school, in which case it continues until graduation or age 19, whichever comes first. If the child dies before either of those events, the obligation ends when ready. The paying parent does not need to file paperwork to stop payments — the obligation straightforward ends on the date set by law.

The court order itself may say something different, and if it does, that order controls. Some parents agree to extend support past 18 or to pay for college, and those agreements are enforceable. You need to read your actual court order to know when your obligation ends, because the order may have modified the standard rule.

Key Takeaways

• Child support ends on the child's 18th birthday in Washington, unless the child is still enrolled in high school.
• If the child is in high school on their 18th birthday, support continues until graduation or age 19, whichever comes first.
• Your specific court order may extend the end date or add conditions like college attendance, so you must check your own order.
• The paying parent should notify the Department of Social and Health Services or the court if circumstances change before the end date.

What happens if the child is still in high school at 18

Washington extends the child support obligation past age 18 if the child is enrolled in and attending high school. The support continues until the child graduates or turns 19, whichever happens first. This applies even if the child is older than typical for their grade level.

The receiving parent or the child's school can provide proof of enrollment if the paying parent disputes whether the child is still in high school. If the child drops out or stops attending, the obligation ends at that point, not at age 19. The paying parent should report the change to the court or the Department of Social and Health Services if support is being collected through them.

How to verify the exact end date in your court order

Your child support order contains the termination date or the rule that determines it. If the order says "support ends when the child turns 18" or "support ends upon high school graduation," those are the standard Washington rules. If it says something else — such as "support continues through college" or "support ends at age 21" — that modified date is what you must follow.

You can find your court order by contacting the court that issued it (usually the Superior Court in the county where the case was filed) or by asking the Department of Social and Health Services if they are collecting support. If you cannot locate the order, the court clerk can provide a copy for a small fee. Read the section titled "Termination," "End Date," or "Duration" to find the exact language.

What to do when support is about to end

If you are the paying parent, you should continue making payments until the end date passes. Do not stop early, even if you believe the child has graduated or turned 18, because the court order controls and stopping early can result in arrears and enforcement action.

If you are the receiving parent and support has not stopped by the end date, contact the Department of Social and Health Services or the court that issued the order. Provide proof that the child has reached the age or graduation date specified in the order. The agency or court can then close the case and stop collection efforts.

When a child support order can be modified before the end date

Either parent can ask the court to change the support amount or end date before it naturally terminates, but only if there has been a substantial change in circumstances. A substantial change means something significant has happened since the order was issued — such as a job loss, a major increase in income, a change in custody, or the child's needs changing.

The court will not modify an order straightforward because one parent wants it to end early or because the child is no longer in school but still under 18. You must file a motion to modify with the court and show the judge why the change is necessary. If the Department of Social and Health Services is handling the case, you can also ask them to review the order, though the court has final authority.

What happens if the child has special needs or disabilities

Washington law does not automatically extend child support past 18 for a child with disabilities or special needs. The obligation still ends on the standard date unless the court order specifically says otherwise. Some parents negotiate an agreement to continue support for an adult child with disabilities, and the court can approve that agreement.

If you want to extend support for a disabled adult child, you and the other parent can agree in writing and ask the court to approve the modification. If you cannot agree, you can file a motion to modify, but you will need to show the court that the child's condition and needs justify extending the obligation. The court has discretion to approve or deny the request.

Frequently Asked Questions

Does child support end automatically on the end date, or do I need to file something?

Child support ends automatically on the date specified in your court order. You do not need to file paperwork or notify the court. However, if support is being collected through the Department of Social and Health Services, you may want to notify them so they close the case and stop collection efforts.

What if my child turns 18 but is not in high school — does support end right away?

Yes. If the child is not enrolled in or attending high school on their 18th birthday, the obligation ends that day. The child does not have to be in a traditional school — homeschooling counts as high school enrollment if the child is working toward a diploma.

Can I stop paying child support early if the child moves in with me?

No. You must continue paying until the end date in your court order, even if the child lives with you. If you want to stop paying early, you must file a motion to modify the order with the court and show the judge why the change is justified. A change in living arrangement may be grounds to modify, but the court decides.

What if the child goes to college — does support continue?

Not unless your court order says it does. Washington law does not require support to continue for college attendance. If your order is silent on college, support ends on the standard date. If you and the other parent agreed to pay for college, that agreement must be in writing and approved by the court to be enforceable.

How do I learn about there are arrears owed after support ends?

Contact the Department of Social and Health Services or the court that issued the order and ask for an accounting of all payments made and any balance owed. If arrears exist, they do not disappear when the child turns 18 — the paying parent still owes them. The receiving parent can pursue collection through the court or through the state's enforcement mechanisms.