Milwaukee County Child Support Services, at 901 North 9th Street in the John P. Hayes Center, handles the full life of a child support case: establishing paternity, setting the order, collecting payments, and enforcing them when a parent falls behind. Wisconsin uses a percentage-of-income formula, so the basic math is more predictable than in many states, but shared placement, health insurance, and modification rules add real complexity. The customer service line is (414) 615-2593.1Milwaukee County. Milwaukee County Child Support Services
How the Support Amount Is Calculated
Wisconsin sets child support as a flat percentage of the paying parent’s gross income under Chapter DCF 150 of the Administrative Code. Gross income includes wages, bonuses, commissions, and most other earnings before taxes.2Wisconsin State Legislature. Wisconsin Administrative Code DCF 150.04(5) The percentages step up with each additional child:
- 1 child: 17%
- 2 children: 25%
- 3 children: 29%
- 4 children: 31%
- 5 children: 34%
Those figures assume one parent has the child most of the time. The paying parent sends the percentage amount to the custodial parent, usually through automatic withholding from their paycheck.
Shared Placement Changes the Formula
When both parents care for the child at least 25% of the time, which works out to at least 92 overnights per year, Wisconsin switches to a shared-placement formula that accounts for both incomes and the proportion of time each parent has the child.3Wisconsin Department of Children and Families. Shared-Placement Worksheet to Estimate Support The higher-earning parent still typically pays, but the amount is reduced because both households absorb daily costs. The court also assigns responsibility for “variable costs” like school supplies, extracurriculars, and transportation, usually split in proportion to placement time, with room to adjust for an income gap.4Wisconsin State Legislature. Wisconsin Administrative Code DCF 150.035
Health Insurance Is Addressed Separately
Every Wisconsin order has to deal with health coverage on top of the basic support amount. The court can order one or both parents to carry insurance for the child, but only if the plan is accessible (providers generally within 30 minutes or 30 miles of the child’s home) and available at a reasonable cost (premium no more than 10% of the insuring parent’s monthly income available for support).5Wisconsin State Legislature. Wisconsin Administrative Code DCF 150.05(1) The parent who doesn’t carry the plan may be ordered to contribute toward the premium, capped at the same 10%. Uncovered costs like copays and deductibles are usually split based on each parent’s ability to pay.
Opening a Case in Milwaukee County
To open a case, download the Parent Application for Child Support Services from the Wisconsin Department of Children and Families website. Fill it out, sign the back page, and return it to the Milwaukee County office by mail, in person at 901 North 9th Street, Room 101, or through the state’s digital portal.6Wisconsin Department of Children and Families. Apply for Child Support Services There is no fee for full case management. A $25 fee applies only if you request locate-only services to find the other parent without opening a full case.
Have identifying information ready for both parents and all children (names, dates of birth, Social Security numbers if you have them). Information about the other parent’s employer and payroll address helps the agency set up income withholding once an order exists. Recent pay stubs and tax returns support income verification, though the agency can pull wage data independently. A caseworker reviews the file, follows up on anything missing, and starts locating the other parent to begin court proceedings.
Paternity for Unmarried Parents
If the parents weren’t married when the child was born, support can’t be ordered until legal paternity is established. Milwaukee County has a dedicated Paternity Establishment Unit at (414) 278-5200.1Milwaukee County. Milwaukee County Child Support Services There are two routes.
Both parents can sign a Voluntary Paternity Acknowledgment, often at the hospital. Once filed with the state registrar, it carries the same legal weight as a court judgment.7Wisconsin State Legislature. Wisconsin Statutes 767.805(1) – Voluntary Acknowledgment of Paternity Either parent can rescind it within 60 days of filing without going to court. If the signer was a minor, that 60-day window doesn’t begin until their eighteenth birthday. After the window closes, undoing the acknowledgment requires a court petition and strong proof, such as genetic test results excluding the man.
When paternity is contested, the court orders genetic testing. If the results don’t exclude the alleged father and show a 99.0% or higher statistical probability of parentage, he is presumed to be the father. Results that exclude him end the case. If an alleged father skips the test, the hearing, or the trial, the court can enter a default judgment declaring him the father and ordering support.8Wisconsin State Legislature. Wisconsin Statutes 767.893(2)(a) – Default Judgments Missing a court date in a paternity case is one of the costliest mistakes a parent can make.
Fees Once a Case Is Open
Applying is free, but Wisconsin charges several ongoing fees on an active case:9Wisconsin Department of Children and Families. Fees and Costs for Child Support Services
- Annual $35 custodial-parent fee, charged each year after October 1 once a case has received $550 or more in support, deducted from a payment before it reaches you.
- Annual $65 receipt-and-disbursement fee charged to the paying parent on each court case; it can be collected through income withholding if unpaid.
- Genetic testing of up to $60 per person when the agency arranges it.
- A $30 modification filing fee at most courts.
- A tax intercept fee of 10% of any intercepted amount over $10, capped at $25.
Employers who process income withholding can also charge the paying parent up to $3 per withholding.
How Payments Move and What Happens If They’re Late
All Wisconsin child support flows through the Wisconsin Support Collections Trust Fund (WI SCTF).10Wisconsin Department of Children and Families. The Wisconsin Child Support Program In most cases the paying parent’s employer withholds the ordered amount from each paycheck and sends it to WI SCTF automatically. If wage withholding isn’t active, the paying parent can pay online or mail a check that includes their name and case PIN so it credits correctly. Both parents can check payment history through the state’s online parent portal, and the automated WI SCTF line at 1-800-991-5530 answers payment questions around the clock.
Arrears accrue interest. Wisconsin’s base statute sets the rate at 1% per month on any past-due amount equal to or greater than one month’s support obligation. A statewide pilot in effect since April 2014 cuts that to 0.5% per month.11Wisconsin State Legislature. Wisconsin Statutes 767.511 – Child Support Even at the reduced rate, $5,000 in unpaid support adds $300 in interest a year.
Changing an Existing Order
Either parent can ask for a review of an existing order under Wisconsin Statutes section 767.59. The standard path opens up a review 33 months after the last order was entered.12Wisconsin State Legislature. Wisconsin Statutes 767.59 – Revision of Support and Maintenance Orders You don’t have to wait if you can show a substantial change in circumstances, such as a major income swing, job loss, or a significant placement change.
Not every change moves the number enough to matter. The child support agency won’t recommend a modification if the new amount would differ from the current order by less than 15% and the dollar difference is less than $50 per month.13Wisconsin Department of Children and Families. Guide to Changing and Ending Child Support Both thresholds must be met for a change to be denied on that ground, so a small percentage change on a large order can still qualify if the dollar amount clears $50. Shifts in health insurance costs, childcare needs, or a move from shared to primary placement can also justify a new order. Most courts charge the $30 filing fee for the hearing.
When Child Support Ends
A Wisconsin parent’s obligation runs until the child turns 18. If the child is still in high school or working toward a GED at that point, support extends until graduation or age 19, whichever comes first.13Wisconsin Department of Children and Families. Guide to Changing and Ending Child Support Support can end sooner if the child marries, enlists in the military, or is otherwise emancipated by a court.
Reaching the end date does not erase a balance. Arrears and the interest on them survive until paid in full, and the custodial parent or the state can keep enforcing collection long after the child ages out.
What Happens When a Parent Doesn’t Pay
Wisconsin’s enforcement tools stack, and the consequences escalate quickly.
Income withholding comes first and handles most cases: the state tells the employer to deduct support before the parent sees the money. When that isn’t enough, the agency can intercept state and federal tax refunds, seize funds from bank accounts, and place liens on vehicles and other property. Wisconsin can also suspend driver’s, professional, and recreational licenses once arrears reach 300% of the monthly support amount or $1,000, whichever is greater, if no alternative payment plan is in place.14Wisconsin Department of Children and Families. License Suspension
A parent who willfully ignores an order can be held in contempt of court. Remedial contempt, meant to coerce compliance, can mean up to six months of jail that ends when the parent complies. Punitive contempt for a proven violation can bring a fine of up to $5,000 or up to one year in county jail.15Wisconsin State Legislature. Wisconsin Statutes Chapter 785 – Contempt of Court
Federal consequences layer on top. Once arrears reach $2,500, the federal government can deny, revoke, or restrict the parent’s passport, with no hardship exception. Willful failure to pay support for a child in another state can bring federal charges under 18 U.S.C. ยง 228: a misdemeanor with up to six months in prison when the debt has gone unpaid for over a year or exceeds $5,000, and a felony with up to two years when arrears pass $10,000 or two years unpaid.16Office of the Law Revision Counsel. 18 USC 228 – Failure to Pay Legal Child Support Obligations The IRS can offset a parent’s federal tax refund for past-due support, and unlike some other federal debt offsets, there is no hardship bypass for child support intercepts.17Taxpayer Advocate Service. How to Prevent a Refund Offset