Child Support for Unmarried Parents in Wisconsin

If you and the other parent were never married, you can still get child support in Wisconsin, and the amount is calculated the same way it is for married parents. The one extra step is that legal paternity has to be established first. Until the law recognizes who the father is, there is no one a court can order to pay support.

That paternity step is the gateway to everything else: a support order, a placement schedule, and the child's right to benefits and inheritance. How paternity gets established, a signed acknowledgment versus a court case, also affects how quickly support can start and whether the father gains custody and placement rights at the same time. This page explains how the two pieces fit together and where the money actually begins.

Do You Have to Establish Paternity Before Getting Child Support?

Yes. For unmarried parents in Wisconsin, there is no child support order until legal paternity is established. When parents are married, the law presumes the husband is the father. When they are not married, there is no legal father by default, so there is no one for a court to order to pay support, set placement, or grant custody.

Under Wis. Stat. § 767.80^[1], a court cannot enter a child support, legal custody, or physical placement order until the father is legally established. Being named on the birth certificate does not settle it on its own, unless the name was added through the formal acknowledgment process. Living together or putting a name on a birth announcement does not create a support obligation.

How Paternity Gets Established in Wisconsin

Wisconsin recognizes two main ways to establish paternity, and the path you take affects how fast support can start.

• Voluntary Paternity Acknowledgment. Both parents sign a state form, often at the hospital when the child is born. Once it is filed and the rescission window passes, it carries the same legal effect as a court judgment of paternity under § 767.805^[2]. A parent can rescind within 60 days, or until a court order, whichever comes first.
• Court paternity action. When paternity is unestablished or disputed, the mother, the father, the child, or the state can file a paternity case, and the court can order genetic testing. A case can even be filed before the child is born, though it usually waits for the birth to conclude.

Either way, the formal process of establishing paternity in Wisconsin is what unlocks a support order. A signed acknowledgment is faster; a contested case with genetic testing takes longer, and support generally cannot be ordered until it finishes.

How Child Support Is Calculated for Unmarried Parents

Once paternity is established, child support for unmarried parents is calculated exactly the same way as for married parents. Wisconsin uses a percentage-of-income standard under § 767.511^[3]. The base guideline takes a share of the paying parent's income: 17 percent for one child, 25 percent for two, 29 percent for three, 31 percent for four, and 34 percent for five or more.

Being unmarried does not change the formula, the percentages, or the obligation. Shared placement, serial families, and very high or low incomes adjust the math the same way they would for any parent. All of it sits within Wisconsin's broader child support framework.

Past Support and Birth Expenses

A Wisconsin paternity case can reach backward, not just forward. When paternity is established, the court can order the father to pay support dating back toward the child's birth, plus a share of the mother's pregnancy and birth expenses. Under section 767.805, the father's share of those pregnancy and birth costs is capped at one-half of the reasonable total.

Past support cannot reach back before the child was born. Support that has gone unpaid can build into back child support, which carries interest and does not disappear. The longer paternity stays unestablished, the more past support and birth expenses can pile up, which is why both parents usually have reasons to resolve it early.

Establishing Paternity Also Opens Custody and Placement Rights

For an unmarried father, paternity is also the gateway to legal custody and physical placement, not just a support bill. Establishing paternity is what lets a father ask the court for decision-making authority and time with the child. Before that, he has no enforceable right to either.

Custody and placement run on a separate track from support, decided under Wisconsin's child custody and placement framework. The two are connected, though: how much placement each parent has can change the support calculation under the shared-placement rules.

How Sterling Lawyers Helps Unmarried Parents With Child Support

Sterling Lawyers handles only family law across Wisconsin and Illinois. For unmarried parents, we handle both halves of the problem: getting paternity established cleanly and getting a support order that reflects the right income. 

Whether you are a mother trying to get support started or a father who wants a fair order and real time with your child, the paternity step shapes everything that follows. Instead of billing by the hour while that plays out, we set a fixed fee at the start so your total cost is defined before you hire us.

Because we charge a fixed fee, you can call and ask questions without watching a clock. And because Sterling handles only family law, your case is worked by attorneys who work inside the Wisconsin paternity and support statutes every day, not attorneys who dabble across unrelated practice areas.

What to Do Next

If you and the other parent were never married, the first move is establishing legal paternity, because that single step unlocks support, placement, and the child's rights. Start with the broader picture of family law and child support in Wisconsin with Sterling Lawyers, and if paternity is unresolved or disputed, talk with an attorney early so support can start from the right date and the order reflects the real income.