What Happens to Child Support When Your Child Turns 18 in Illinois?

 Posted on September 23, 2026 in Child Support

In Illinois, child support doesn’t automatically end on a child's 18th birthday. How that birthday lines up with high school graduation is relevant. Additionally, college expenses are handled separately and can be ordered well past that point, so the obligation often lasts longer than parents expect.

If your child is approaching adulthood in 2026, a Chicago, IL family law attorney can review your child support order and explain what changes and when.

What Does Illinois Law Say About Child Support Termination?

According to 750 ILCS 5/505, if the child is still attending high school after turning 18, the support order continues until the earliest of the child’s high school graduation or 19th birthday.

For example, if your child turns 18 in January and graduates in May, support will likely continue through graduation. However, if the child remains in high school past age 19, regular child support will end at 19. A written agreement or court judgment can also set different terms.

Does a Parent Have to Go to Court to Stop Child Support in Illinois?

Illinois child support orders must include a date when current support ends. Before stopping payments, the paying parent should check the order for that date rather than assuming support ends on the child's birthday.

Some older orders or unusual situations require more attention. If your order does not give a clear end date, an attorney can review it and determine whether you need to ask the court to end or change the obligation. Stopping payments too early can lead to unpaid support and enforcement problems.

What Happens if You Owe Back Child Support When Your Child Turns 18 in Illinois?

Turning 18 does not erase unpaid child support, as this is a separate obligation. The termination date in a support order applies to current support, not any unpaid balance from earlier payments.

A parent who owes past-due support must still pay that debt after the current obligation ends. The other parent can also continue to seek child support enforcement for unpaid amounts.

Do Parents Have to Pay for College After Illinois Child Support Ends?

Regular child support and college expenses are treated differently in Illinois. Ending current child support does not settle the question of who will pay for a child's education after high school.

Under 750 ILCS 5/513, an Illinois court can order parents to contribute toward qualifying educational expenses for a non-minor child. Unless the parents agree otherwise, expenses covered by a petition must be incurred before the student turns 23. A court can extend that age for good cause, but not beyond age 25.

Parents can also address college costs in their divorce agreement. If your child is approaching college age, it is worth reviewing your judgment before tuition bills become due.

College Expenses Can Parents Be Required to Pay

Illinois law allows courts to address more than tuition when ordering contributions to a child's education. The court can consider the parents' financial resources and the child's resources when deciding what each person should contribute. Covered educational expenses can include:

• Tuition and required fees
• Housing and meal costs
• Books and other supplies needed for school
• Medical and dental costs, including health insurance
• Reasonable living expenses during the school year and school breaks

The law also allows courts to address certain college application and entrance exam costs. Parents should not assume that an old child support amount will simply continue as the child's college contribution.

Can Support in Illinois Continue for an Adult Child With a Disability?

Illinois has separate rules for supporting an adult child with a disability. A court can order support for a non-minor child who has a mental or physical disability and is not otherwise emancipated, as long as the disability began while the child was still eligible for child support or educational support.

A parent may request this support before or after the child reaches adulthood. When deciding whether to award it, the court looks at the child’s needs and financial resources, along with each parent’s ability to contribute.

Contact a Cook County, IL Child Support Attorney

As your child gets older, it is important to know when your current support order ends and whether other financial duties will continue. At The Law Office of George J. Skuros, we help parents understand their obligations and what they can realistically expect.

For a free consultation, contact a Chicago, IL child support lawyer or call 312-884-1222 today.