Child support in Wisconsin ends when the child turns 18, or up to age 19 if the child is still working toward a high school diploma or GED, whichever comes later. A child who turns 18 in February but graduates in June stays covered through graduation. A child still enrolled in high school at 19 hits a hard cutoff on that 19th birthday no matter what.1Wisconsin State Legislature. Wisconsin Statutes 767.511 – Child Support
That’s the rule. The harder part is making payments actually stop, protecting yourself when one child on a multi-child order ages out, and understanding that any unpaid balance follows you for years after the current obligation ends.
The 18-or-19 Rule in Practice
Wisconsin Statute 767.511(4) requires courts to order support for any child under 18, or under 19 if the child is “pursuing an accredited course of instruction leading to the acquisition of a high school diploma or its equivalent.”1Wisconsin State Legislature. Wisconsin Statutes 767.511 – Child Support The Wisconsin Department of Children and Families puts it the same way: the duty continues until the child turns 18, or 19 if the child is still enrolled in high school or working on a GED.2Wisconsin Department of Children and Families. When Child Support Ends
Nothing in the statute extends support past 19 for any educational reason. Wisconsin courts cannot order a parent to pay for college as part of a child support obligation. Any college contribution is voluntary.
Wisconsin also does not include a statutory provision for court-ordered support past 19 based on a child’s physical or mental disability. Parents who want to continue support for a disabled adult child can enter a voluntary stipulation that the court approves, but a court cannot impose one over the other parent’s objection.
The 90-Day Notice From the Agency
Local child support agencies send notices to both parents 90 days before the youngest child’s verified 18th birthday. The current support order ends when that child turns 18 unless a parent gives the agency documentation that the child is still attending high school or enrolled in a GED program.2Wisconsin Department of Children and Families. When Child Support Ends
The receiving parent who wants support to continue past 18 has to supply proof of enrollment. Without it, the agency treats 18 as the end date. If your child is approaching 18 and you haven’t seen a notice, contact your local agency to confirm your address is current.
Events That End Support Before 18
A support obligation can end early if the child becomes legally emancipated by court order, gets married, has a parent’s rights terminated by the court, or dies. Each changes the child’s legal status in a way that eliminates the underlying duty.
If one of these happens, contact the local child support agency promptly. Only a court can formally modify or end an order, and stopping payments on your own can leave you with arrears even when the reason looks obvious.3Wisconsin Department of Children and Families. Guide to Changing and Ending Child Support
When Only the Oldest Child Ages Out
If your order covers more than one child and the oldest ages out, the support amount does not adjust automatically. Wisconsin has no statutory mechanism for reducing child support when one child on a multi-child order reaches adulthood. You have to file a motion to modify, and the court will recalculate based on the remaining children.
This is where parents lose money. If you keep paying the full amount without requesting a modification, the court cannot retroactively refund or credit the overpayments made before you filed. File the motion as soon as the oldest child ages out, not months later.
How Payments Actually Stop
For the youngest child on an order, the agency drives the process through its 90-day notice. Once the child turns 18, or graduates high school if still enrolled past 18, the agency updates the order status and notifies the employer to stop income withholding.2Wisconsin Department of Children and Families. When Child Support Ends
Employers keep deducting until they receive formal notice from the agency. A verbal request will not stop it. If deductions continue after the obligation has ended and you owe no arrears, call the agency to confirm the termination has been processed. If past-due support exists, income withholding may continue at the same monthly level until the arrears are paid in full.3Wisconsin Department of Children and Families. Guide to Changing and Ending Child Support
Arrears Don’t End When the Order Does
Ending current support does not wipe out any past-due balance. Wisconsin can enforce child support arrears for up to 20 years after the youngest child turns 18.2Wisconsin Department of Children and Families. When Child Support Ends
Interest accrues on unpaid support at 0.5% per month, or 6% per year. Interest charges begin once the past-due amount equals or exceeds one month’s support obligation, and they continue even while the parent is making partial payments on the debt.4Wisconsin Department of Children and Families. Collecting Past-Due Child Support – Section: Charging Interest on Past-Due Support
The enforcement tools are substantial. Wisconsin’s support enforcement agency can intercept state tax refunds, seize assets held in financial institutions, and suspend licenses.5Wisconsin State Legislature. Wisconsin Statutes Chapter 769 – Section 769.310 Federal tax refund offsets are also available for qualifying cases. Income withholding typically continues at the same monthly level that applied during the active order until the full balance, including interest, is paid.6Wisconsin Department of Children and Families. Your Guide to Past-Due Support
If you owe arrears, check with your local child support agency to make sure a court order is in place establishing a payment plan on the past-due amount. Without one, the full balance remains subject to immediate enforcement at any point during the 20-year window.