How to File for Child Custody in Wisconsin: Forms, Service, and Hearing

To file for child custody in Wisconsin, you start by submitting a petition and summons to the Clerk of Courts in the county where you meet the residency requirement, then serve the other parent and work through the steps the court sets before a judge issues a final order. Wisconsin separates custody into two ideas that get decided together: legal custody, meaning the authority to make major decisions about your child’s health, education, and religion, and physical placement, meaning the schedule of time your child spends with each parent. Every ruling turns on what the judge finds serves the child’s best interests under Wis. Stat. § 767.41(5).¹

Confirm Wisconsin Has Jurisdiction

Before a Wisconsin court can decide custody, the state has to qualify as your child’s “home state” under the Uniform Child Custody Jurisdiction and Enforcement Act. That means your child has lived here with a parent for at least six consecutive months right before you file. Temporary absences during that window still count. If your child is younger than six months, Wisconsin qualifies as long as the child has lived here since birth.²

You also have to file in the right county. The parent starting the case generally needs to have lived in that county for at least 30 days.³ Filing in the wrong county can get your case dismissed, forcing you to start over.

There is a narrow exception for emergencies. A Wisconsin court can act even without the six-month residency if the child is physically present in the state and has been abandoned, or if the child, a sibling, or a parent is being subjected to or threatened with abuse. Emergency orders stay in place until the child’s actual home state takes over.⁴

Establish Paternity First if You Were Never Married

Married parents can skip this step. If you were never married to the other parent, paternity has to be legally established before a father can even ask for custody or placement. Under Wisconsin law, an unmarried mother holds sole legal custody until a court orders otherwise.⁵

The simplest route is a Voluntary Paternity Acknowledgment. Both parents sign and notarize the form, and it is filed with the Office of Vital Records so the father’s name goes on the birth certificate. That establishes legal fatherhood, but it does not by itself grant custody or placement. It gives the father standing to ask a court for those rights.⁶ If the parents disagree, the court will hold a hearing and may order genetic testing.

Prepare the Forms You’ll File

Wisconsin’s court system publishes standardized forms online and at every Clerk of Courts office. Errors and omissions are the most common reason cases stall for weeks, so take time to get the details right.

Petition and Summons

The foundational filing is a Summons paired with a Petition for Custody. The petition identifies both parents, the children, and where everyone currently lives, and it states whether you want sole or joint legal custody along with the placement schedule you are asking for.⁷

UCCJEA Declaration (Form GF-150)

This form gives the court what it needs to confirm jurisdiction. You list every address where your child has lived over the past five years and the names of the people in each household during that time.⁸ It exists to keep competing custody cases from running at the same time in different states.

Financial Disclosure Statement

Both parents have to provide a full picture of their finances. The disclosure covers all assets held individually or jointly, including real estate, savings, investments, retirement accounts, business interests, and personal property, along with all debts and a statement of income earned so far this year. If your case involves a minor child, you also have to disclose health insurance available through each parent’s employer and any policy naming the child as a beneficiary. These disclosures are due within 90 days after service of the summons, unless the court sets a different deadline.⁹ The court uses this information for child support calculations.

File the Petition and Pay (or Waive) the Fee

Bring your originals and several copies to the Clerk of Courts in your county. The filing fee for a family case without a support or maintenance request is $184.50. If you are also asking for child support or maintenance, the total is $194.50. Cases filed electronically carry an added $35 surcharge per party.¹⁰

If you can’t afford the fee, file a Petition for Waiver of Fees and Costs (Form GF-183) along with your petition. A judge reviews your financial information and decides whether you qualify. Don’t let the cost stop you from filing; submit the waiver at the same time so the case doesn’t sit waiting on payment.

Serve the Other Parent

Once the clerk stamps your petition, the other parent has to be formally served. You can’t hand the papers over yourself. Wisconsin requires service through a process server, the county sheriff, or another adult who is not a party to the case. The person who delivers the papers then files an affidavit of service proving the other parent received notice.¹¹

If you genuinely cannot locate the other parent, the court may allow service by publication, but only after you have made a real effort to find them. Judges expect to see that you called relatives, checked public records, searched social media, and contacted the last known employer. When publication is approved, the notice runs as a class 3 notice under Chapter 985 of the Wisconsin Statutes, meaning once a week for three consecutive weeks. If you know or can find the other parent’s mailing address, you also have to mail copies of the summons and petition.¹¹

Without proof of service on file, the court has no authority over the other parent and can’t schedule hearings or issue enforceable orders. If the other parent is avoiding service, a professional process server is usually more effective than the sheriff’s office.

What Happens After You File

Temporary Orders

Custody cases take months, and children need structure in the meantime. After service is completed, the court holds an initial hearing or Order to Show Cause hearing where a judge or court commissioner puts temporary orders in place. These set the rules for where the child lives, who makes decisions, and how placement is divided while the case is pending. Temporary orders are not final, but they carry weight. If an arrangement works during this stage, judges often let it continue in the final order.

Mediation and the Parenting Plan

When custody or placement is contested, the court refers both parents to mediation. A neutral mediator helps you try to reach an agreement without a trial. The first session is free. If you need more sessions, the total fee for the rest is $200, no matter how many it takes, and counties can reduce or waive that based on ability to pay.¹²

Most Wisconsin custody cases actually resolve in mediation. If you reach a full or partial agreement, the mediator drafts it for the court’s approval. If mediation fails, each parent has to file a formal Proposed Parenting Plan (Form FA-4147V) within 60 days. The plan spells out your current and planned living situation, work schedule, child care, proposed schools, medical providers, holiday and summer schedules, and how you’d handle future disagreements. Missing the 60-day window without good cause waives your right to object to the other parent’s plan.¹³

Parent Education Programs

The court can order both parents to attend a program on how separation affects children. The program is capped at four hours and covers child development, family dynamics, and co-parenting after a breakup. Parents pay the cost, though the court can assign responsibility to one parent or, for an indigent parent, shift it to the county.¹⁴ The court can make attendance a condition of entering the final judgment.

Guardian ad Litem

In contested cases, the court is generally required to appoint a Guardian ad Litem, an attorney whose only client is your child. The GAL investigates the family and advocates for whatever the GAL concludes is in the child’s best interests, which may not match what either parent wants.¹⁵ Expect a GAL to meet with your child, visit both homes, review school and medical records, and interview teachers, therapists, and other adults in the child’s life. The judge takes the GAL’s recommendation seriously but is not bound by it.

Custody Study

If mediation fails, the court may also order a formal custody study. A county-designated investigator evaluates each parent’s home, parenting history, any domestic abuse concerns, and other matters affecting the child. The report has to be given to both parents and the court at least 10 days before it can be used as evidence, so each side has time to review and challenge it.¹⁶ The fee is $300, subject to reduction based on ability to pay.¹²

The Final Hearing and the Best-Interest Factors

At trial, the judge weighs the evidence against the best-interest factors in Wis. Stat. § 767.41(5). Those factors include the wishes of each parent and, depending on age, the child; how the child interacts with parents, siblings, and other important people; the child’s adjustment to home, school, and community; each parent’s mental and physical health; the availability of child care; any history of domestic abuse or substance abuse; and whether the parents can cooperate and communicate. No single factor controls, and the judge weighs them based on your family’s circumstances.¹

The final order spells out legal custody, the physical placement schedule, and any conditions the court imposes. Divorce and legal separation cases must wait at least 120 days after service before trial. Standalone custody cases can move faster, but between mediation, the GAL investigation, any custody study, and court scheduling, most contested cases still take several months from filing to final order.

Changing or Enforcing the Order Later

Custody orders can be revisited, but Wisconsin makes early changes hard. For the first two years after a final order, a parent asking for a change must show by substantial evidence that the current arrangement is physically or emotionally harmful to the child. After two years, the standard loosens: you have to show a substantial change in circumstances, and the court applies the same best-interest factors it used the first time.¹⁷

When the other parent ignores a placement schedule or violates a custody order, you can file a Petition to Enforce Physical Placement (Form FA-609) for placement violations, or the court’s contempt packet (Form FA-5009V) for broader violations. The contempt packet requires an Order to Show Cause and Affidavit, and the other parent must be personally served at least five business days before the hearing.¹⁸ Consequences can include makeup placement time, fines, and in serious cases, jail. A written log of every missed exchange or denied visit, with dates and communications, makes enforcement hearings go far more smoothly than general complaints do.

1
Wisconsin State Legislature. Wisconsin Statutes 767.41 – Legal Custody and Physical Placement
2
Wisconsin State Legislature. Wisconsin Statutes 822.02 – Definitions
3
Wisconsin State Legislature. Wisconsin Statutes 767.481 – Actions to Establish Custody
4
Wisconsin State Legislature. Wisconsin Statutes 822.24 – Temporary Emergency Jurisdiction
5
Wisconsin Department of Children and Families. Establishing Legal Fatherhood (Paternity)
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Wisconsin Department of Children and Families. Voluntary Paternity Acknowledgment
7
Wisconsin Courts. Form FA-4104V
8
Wisconsin Courts. Form GF-150 – Uniform Child Custody Jurisdiction and Enforcement Act Declaration
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Wisconsin State Legislature. Wisconsin Statutes 767.127 – Financial Disclosure
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Wisconsin Courts. Wisconsin Circuit Court Fee, Forfeiture, Fine and Surcharge Tables
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Wisconsin State Legislature. Wisconsin Statutes 801.11 – Personal Jurisdiction, Manner of Serving Summons For
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Wisconsin State Legislature. Wisconsin Statutes 814.615 – Fees for Mediation and Studies
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Wisconsin State Legislature. Wisconsin Statutes 767.41(1m) – Parenting Plan
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Wisconsin State Legislature. Wisconsin Statutes 767.401 – Educational Programs and Classes
15
Wisconsin State Legislature. Wisconsin Statutes 767.407 – Guardian ad Litem for Minor Children
16
Wisconsin State Legislature. Wisconsin Statutes 767.405(14) – Legal Custody and Physical Placement Study
17
Wisconsin State Legislature. Wisconsin Statutes 767.451 – Revision of Legal Custody and Physical Placement Orders
18
Wisconsin Courts. Contempt Packet Instructions FA-5009V