When Child Support Ends in Missouri

Child support in Missouri ends when your child turns 18, graduates high school, or becomes emancipated — whichever happens first

Missouri law sets the age of majority at 18, which is when child support payments normally stop. However, if your child is still in high school when they turn 18, support continues until they graduate or until age 19, whichever comes first. The paying parent (called the obligor) and the parent receiving support (called the obligee) do not have to file anything to end support at these points — it stops automatically by law.

If your child becomes emancipated before age 18 — meaning they marry, join the military, or the court declares them legally independent — child support ends at that time instead. The specific date support ends depends on which circumstance applies to your situation.

Key Takeaways

• Child support ends automatically when your child turns 18, unless they are still enrolled in high school.
• If your child is in high school on their 18th birthday, support continues until graduation or age 19, whichever is earlier.
• Emancipation before age 18 — through marriage, military service, or court order — ends support when ready.
• The paying parent should notify the court or the Family Support Division if circumstances change before the automatic end date.
• If your child turns 18 and is not in high school, you may need to file paperwork to formally stop the payment order.

How the age 18 rule works in Missouri

When a child reaches their 18th birthday, Missouri law treats them as an adult. Child support obligations end on that date unless the child is still enrolled in high school. This applies even if the child is living with the receiving parent or is financially dependent.

The paying parent does not have to request termination or file court papers for this to happen. However, many obligors continue paying by mistake because they do not realize support has ended, or because the payment order was not clear about the high school exception. If you are paying support and your child has turned 18 and is not in high school, contact the Family Support Division (the state agency that handles child support) or your local circuit court to confirm the order has been terminated.

The high school exception: support until graduation

Missouri extends child support past age 18 if your child is still enrolled in high school on their 18th birthday. Support continues through the end of the school year in which they graduate, or until they turn 19, whichever happens first. This means a child who turns 18 in September but is a senior can receive support through graduation in May or June.

The high school exception applies only to full-time enrollment in a traditional public or private high school. It does not cover college, trade school, GED programs, or online-only schools. Once your child graduates, support ends when ready, even if they have not yet turned 19.

If your child drops out of high school after turning 18, support ends at that point. The receiving parent should notify the Family Support Division or the court so the payment order can be updated.

Emancipation and early termination

A child can become legally independent before age 18 through emancipation. In Missouri, emancipation happens when a child marries, joins the military, or the court grants an emancipation order. Once emancipated, the child is no longer a minor, and child support ends when ready.

If your child marries or enlists, the paying parent should report this to the Family Support Division with proof (a marriage certificate or military enlistment papers). The court can then terminate the support order. If you believe your child should be emancipated for other reasons, you can file a motion with the court, but the court will not grant emancipation straightforward because a child is living independently or working.

What happens if your child is still in school after age 18

If your child turns 18 while in high school, the receiving parent should provide proof of enrollment to the paying parent or the Family Support Division. This proof can be a school transcript, a letter from the school, or a copy of the enrollment record. Having documentation prevents disputes about whether support should continue.

Once your child graduates, the receiving parent should notify the Family Support Division when ready. Support ends on the graduation date, not at the end of the month or at some later point. If the paying parent continues to receive bills after graduation, they should contact the Family Support Division to request a formal termination order.

Modifying or terminating support before age 18

If circumstances change before your child reaches the automatic end date — such as a job loss, major income change, or custody shift — either parent can ask the court to modify or terminate support early. You will need to file a motion with the circuit court in the county where the original order was issued.

The court will not terminate support straightforward because the paying parent wants it to end. You must show a substantial and continuing change in circumstances, such as a permanent job loss or a significant drop in income. A temporary layoff or a few months of reduced hours usually does not meet this standard.

How to confirm support has ended

If you are the paying parent, do not assume support has ended just because your child turned 18 or graduated. Contact the Family Support Division at 573-751-4301 or visit their website to verify the order status. You can also contact your local circuit court clerk's office. Provide your case number and your child's name, and ask for written confirmation that the order has been terminated.

If you are the receiving parent and payments stop before your child graduates high school, contact the Family Support Division when ready. Payments may have stopped due to an error, or the paying parent may have filed a termination motion without your knowledge. The Family Support Division can tell you the status of the order and help you respond if needed.

Frequently Asked Questions

Does child support end if my child goes to college?

No. In Missouri, child support ends when your child graduates high school, regardless of whether they are going to college. If your child attends college, the paying parent has no legal obligation to pay for tuition, room, or board unless the original court order specifically requires it. This is rare and requires the court to have ordered it at the time the support order was created.

What if my child turns 18 but is still in 12th grade?

Support continues until your child graduates or turns 19, whichever comes first. You will need to show proof that your child is enrolled in high school. Once they graduate, notify the Family Support Division so the order can be terminated.

Can I stop paying child support if my child moves out?

No. Moving out does not end the legal obligation to pay child support. Support ends only when your child turns 18 (and is not in high school), graduates high school, becomes emancipated, or the court terminates the order. If you stop paying before one of these events occurs, you can be held in contempt of court.

What if my child gets married at 17?

Marriage before age 18 emancipates your child in Missouri, and child support ends when ready. You will need to provide the marriage certificate to the Family Support Division to have the order terminated. Without proof, you should continue paying until the court formally terminates the order.

Who tells me when child support ends?

Neither the court nor the Family Support Division automatically notifies you when support ends. It is your responsibility to track the end date and confirm termination with the Family Support Division. If you are unsure, contact them at 573-751-4301 or your local circuit court clerk to verify the order status.