Modifying Child Support and How it is Done in Wisconsin

 Posted on October 23, 2026 in Child Support

Coming to a mutual child support agreement is challenging for both parents, and modifying that same arrangement can be problematic. Not only are changes difficult, but the timing of those revisions needs to be considered. Under Wisconsin law, noncustodial parents are obligated to make child support payments until the child is 18 years old, or 19 if the child is still in high school or working toward his or her GED. Knowing when to make changes to a child support order and how to go about it is crucial, along with understanding how to pursue past-due support from a noncustodial parent.

At Bucher, Wolff & Sonderhouse, LLP, our Waukesha, WI family law attorneys have over 50 years of legal experience. Thanks to our familiarity with the local courts and judges, we are able to navigate child support cases with confidence.

When Can Changes in the Child Support Agreement Be Made?

In Wisconsin, there is a 33-month waiting period before any modifications can be made to the initial child support agreement. Rare exceptions can be made if there is a significant change in circumstances, including a change in either parent’s income, health needs of the child changing, or either parent being placed in jail.

A few misconceptions about what constitutes a change in the agreement include failing to follow visitation rules, the custodial parent legally moving with the child, or either parent voluntarily leaving his or her job. Changes in the child support agreement can only occur once every three years, and the court will determine whether or not a review will be ordered.

How Can You Change a Child Support Order?

Before an order is changed, it is reviewed by a local child support agency and/or by the court. If a child support agency is providing you services, it can write up an agreement for both parents to sign, but the court has to approve any revisions made to the agreement. If the court orders a review, both parents will be required to provide their current financial information.

When a child support order is changed, the amount of support can increase, decrease, or stay the same. If the support amount stays the same, adding medical support to the court order is a possibility. Any changes that are made will not take effect until the court has signed the order.

What Can You Do When the Noncustodial Parent Refuses to Pay Child Support in 2026?

An ideal scenario is when both parties come to an agreement outside of court, and each parent honors his or her end of the child support arrangement. When the noncustodial parent ceases to pay child support, the Department of Children and Families in Waukesha has multiple support enforcement options, including:

Wage Garnishment

Wage garnishment, also called income withholding, is the most common way Wisconsin collects child support. In most cases, the support order itself directs the paying parent’s employer to take support out of each paycheck (Wisconsin State Legislature Section 767.75).

Withholding usually begins when the order is entered, not only after a payment is missed. Withholding can also reach income other than wages, such as pension payments, unemployment benefits, and workers’ compensation. Some parents try to avoid wage garnishment by changing jobs or working for cash. Employers must report new hires to the state, so a new job often leads to a new withholding notice.

Interception of Payments

Interception lets the state take money owed to a parent who is behind on child support and apply it to the unpaid balance. Once past-due support reaches a certain level, the debt can be certified to the Wisconsin Department of Revenue. After that, the parent’s state tax refund can be held and sent to the Trust Fund. Federal tax refunds can be taken the same way.

Tax refunds are not the only payments at risk. A parent certified for tax intercept can also lose Wisconsin lottery winnings of $1,000 or more, whether the prize is paid all at once or over time. Unclaimed property and certain payments from state agencies can be taken as well.

Harm to the Parent’s Personal and Professional Reputation

Noncustodial parents who discontinue their support payments will be added to the Wisconsin "deadbeat dad" list. In addition to the embarrassment that comes with being on this list, these individuals will have a more difficult time finding jobs and receiving loans.

When support falls far enough behind, a lien is placed on the parent’s real estate and titled property, such as cars and trucks. A lien can make everyday financial tasks much harder. The parent may not be able to sell or refinance a home, or sell a titled vehicle, until the debt is paid or the lien is released. The state can also seize money from bank accounts to satisfy the lien.

What Evidence Can Support a Request to Modify Child Support in Wisconsin?

A judge will not change support based on a parent’s word alone, so written records carry the most weight. Pay stubs, tax returns, and W-2 forms can show that a parent’s income has gone up or down. A layoff notice or termination letter can show a job loss that was not the parent’s choice. Medical records can support a claim that an illness or injury now limits a parent’s ability to work.

School bills, daycare receipts, and medical expenses can show that raising the child costs more than it did before. A new placement schedule may support a change as well, since the time a child spends with each parent affects how much support is owed.

Contact Our Waukesha, WI Child Support Lawyers for Help

A parent who stops paying child support leaves the other parent covering rent, groceries, and school costs alone. At Bucher, Wolff & Sonderhouse, LLP, we help parents use Wisconsin’s enforcement tools to collect the support their children are owed, from wage withholding to tax intercepts and property liens.

We can also help if you are the parent who has fallen behind and needs to ask the court for a change before the debt grows. Contact our Milwaukee County, WI family law attorneys or call 262-232-6699 to schedule a free consultation.