How Child Support Ends in Missouri

When Child Support Stops Automatically

Child support in Missouri ends automatically when the youngest child turns 18, or when they graduate from high school, whichever happens later — but only if the high school graduation occurs before age 20. If a child is still in high school after turning 18, support continues through the end of that school year or until they turn 20, whichever comes first.

The order does not stop on its own just because the child reached that age. The parent paying support or the parent receiving it needs to notify the Missouri Family Support Division (FSD) or the court that ordered the support. If you do not report the change, payments may continue even though they are no longer required.

If a child is emancipated before age 18 — meaning they marry, join the military, or a court declares them legally independent — support for that child ends when ready. You will need to file paperwork with the court to document the emancipation and stop the payments.

Key Takeaways

• Child support ends when the youngest child turns 18 or finishes high school, whichever is later, but you must notify the Family Support Division or court for payments to actually stop.
• You can request a modification or termination by filing a motion with the circuit court in the county where the order was issued.
• A substantial and continuing change in circumstances — such as job loss, serious illness, or a significant income change — is required to modify or end support before the child reaches the age limit.
• The parent paying support bears the burden of proving the change in circumstances to the court.
• If you stop paying without a court order, you will owe back support plus interest and may face contempt charges.

Filing a Motion to Modify or Terminate Support

If you want to end or reduce child support before the child turns 18 or finishes high school, you must file a motion to modify or terminate with the circuit court in the county where the original order was issued. You cannot straightforward stop paying — the court must approve the change first.

The motion should include your current financial information, proof of the change in your circumstances, and an explanation of why you believe support should end or be reduced. Common reasons include loss of employment, a serious medical condition that prevents work, or a significant drop in income. The court will review your request and may schedule a hearing.

You can file the motion yourself or hire an attorney. If you cannot afford an attorney, you may request a public defender through the court, though availability varies by county. The Family Support Division can also help you understand the process, though they do not represent either parent — they enforce the order on behalf of the state.

Proving a Change in Circumstances

Missouri courts require a substantial and continuing change in circumstances to modify or end child support. This means the change must be significant — not a temporary dip in income — and it must be expected to last. A one-month job loss is not usually enough; the court wants to see that your situation has genuinely shifted.

You will need to provide documentation of the change. If you lost your job, bring termination letters, unemployment records, and evidence that you are looking for work. If you have a medical condition, provide medical records and statements from your doctor about your ability to work. If your income dropped, bring recent pay stubs, tax returns, and a written explanation of why the change occurred.

The burden is on you — the parent paying support — to prove the change. The other parent will likely argue that you should still be able to pay, or that you caused the change yourself (for example, by quitting a job). Be prepared to explain what happened and why it was beyond your control.

What Happens If a Child Becomes Emancipated

Emancipation ends child support when ready for that child, even if they are younger than 18. In Missouri, a child is considered emancipated if they marry, join the military, or a court declares them legally independent. Some orders also end support if a child moves in with the paying parent on a permanent basis.

You must file a motion with the court to document the emancipation and request that support for that child be terminated. Bring proof of the emancipation — a marriage certificate, military enlistment papers, or a court order. The court will then issue an order ending support for that child, though you remain responsible for any other children covered by the original order.

Notifying the Family Support Division

The Missouri Family Support Division handles most child support cases. If support should end because a child turned 18, graduated high school, or became emancipated, you can notify the FSD directly. You do not always need to go to court if the reason for ending support is automatic (age or graduation).

Contact the FSD office in the county where the order was issued. Provide the case number, the child's name and date of birth, and proof of the event that ended support (a birth certificate showing the child's age, a high school diploma, or military papers). The FSD will review the information and update the case. If the other parent disputes the termination, the matter may go to court.

Keep a copy of any communication you send to the FSD. If payments continue after the child reaches the age limit, you will have proof that you reported the change.

What Happens If You Stop Paying Without a Court Order

If you stop paying child support without a court order terminating or modifying the obligation, you will owe back support — all the payments you missed, plus interest. The interest rate in Missouri is set by statute and accrues from the date each payment was due. Back support can accumulate quickly and become a significant debt.

The Family Support Division or the other parent can take action to collect the back support. This may include wage garnishment (taking money directly from your paycheck), intercepting tax refunds, suspending your driver's license, or filing a contempt of court charge. Contempt can result in fines or jail time.

Even if you believe support should have ended, you must go through the court process to stop it. Paying what the court ordered, then filing for a modification, protects you from accumulating back support and legal consequences.

Modifying Support If Your Circumstances Change Again

If your circumstances change after the court has already modified your support order — for example, you lose a new job or your income increases significantly — you can file another motion to modify. Missouri allows multiple modifications as long as there is a substantial and continuing change in circumstances each time.

Each modification requires a new motion, new documentation, and potentially a new hearing. The court will look at your current financial situation and the current needs of the child. If you have remarried or have other children, that information may be relevant to the calculation, though it does not automatically reduce your obligation to your first child.

Frequently Asked Questions

Do I have to keep paying if my child is 18 but still in high school?

Yes. Missouri law requires support to continue through the end of the school year or until the child turns 20, whichever comes first. Once the child graduates or turns 20, support ends. Notify the Family Support Division with a copy of the graduation diploma or birth certificate to stop payments.

What if the other parent agrees to end support — do we still need a court order?

Yes. Even if both parents agree, you need a court order to officially terminate support. Without the order, you remain legally obligated to pay, and the other parent could change their mind and demand back support. File a joint motion or stipulation with the court to make the agreement official.

Can I reduce support if I have a new child with someone else?

A new child may be grounds for a modification, but it does not automatically reduce your obligation to your first child. The court will look at your total income, the needs of both children, and the custody arrangement for each. You will need to file a motion and present financial information to the court.

What if I cannot find the other parent to serve them with the motion?

The court can serve the other parent by mail, email, or publication (posting a notice in a newspaper) if their address is unknown. Talk to the circuit court clerk or an attorney about the options. The Family Support Division may also have contact information for the other parent in their case file.

How long does it take for a modification to be approved?

It varies. If both parents agree and file a joint motion, the court may approve it in a few weeks. If there is disagreement, the court will schedule a hearing, which can take two to four months depending on the court's schedule. During this time, you must continue paying the amount ordered until the court issues a new order.