Child Support Past 18 in Missouri: High School Graduation and Age Limits

By the FigureMyTax Editorial Team · How we calculate

In Missouri, child support ends at 18, but continues for a child still in secondary school until graduation or 21, whichever comes first. The receiving parent must notify the paying parent of emancipation.

What is the child support age limit in Missouri?

Eighteen, unless an extension applies. Unless the circumstances of the child manifestly dictate otherwise and the court specifically so provides, the obligation ends when the child dies, marries, enters active duty in the military, becomes self-supporting (if the custodial parent has relinquished the child from parental control by express or implied consent), reaches 18, or reaches 21 (RSMo 452.340.3).

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

If the child is enrolled in and attending a secondary school program at 18, the parental support obligation continues, if the child keeps attending and progresses toward completion, until the child completes the program or reaches 21, whichever first occurs (452.340.5).

Try your own date in the Missouri child support end date calculator.

Is the Missouri extension automatic?

The statute says the obligation shall continue if the child is enrolled and attending, but the paying parent can dispute attendance or progress. Keep school letters showing enrollment and the expected graduation date.

What does progressing mean in Missouri?

The statute does not define it in the text we read. A child who stops attending or falls far behind is easier to challenge. Keep report cards and attendance records.

What ends Missouri support before 18?

Death, marriage, active military duty, or becoming self-supporting where the custodial parent has relinquished the child from parental control by express or implied consent (452.340.3). Those need proof, so keep the marriage certificate, enlistment papers or documents of independence.

What if the child turns 18 in the middle of the school year?

The statute asks whether the child is enrolled in and attending secondary school when he or she reaches 18; if so, support continues until the program is completed or the child turns 21, whichever comes first (452.340.5). A child who turns 18 in January and graduates in June is covered through graduation.

What if the order says a different age?

The termination list applies unless the circumstances of the child manifestly dictate otherwise and the court specifically provides otherwise (452.340.3). If your judgment names a different date or event, it controls, so read it.

What if the child is homeschooled or in a GED program?

The statute speaks of a secondary school program of instruction; for college it refers to completion of a graduation equivalence degree program. Ask the court early if your child is in a homeschool or GED path, and keep records.

Do I have to file to end child support at 18?

The statute ends the obligation, and the parent receiving support must notify the paying parent of emancipation or owe back support paid afterward plus interest (452.370.4). Withholding keeps running until it is stopped, so ask the court or the division in writing and keep proof of the child’s birth date.

Do arrears end when child support ends?

No. Installments already owed stay owed and keep drawing interest. See the Missouri child support arrears calculator and how long arrears last.

Frequently asked questions

Official sources

• RSMo 452.340: child support; termination; continued support
• RSMo 452.370: modification; emancipation notice
• RSMo 454.520: interest on delinquent support
• RSMo 454.505: withholding

This is general information, not legal advice. It is based on the cited Missouri statutes, rules and court opinions, and every case turns on its own facts. Confirm how the law applies to your situation with a licensed Missouri attorney.