Wisconsin Small Claims Court for Unpaid Invoices: How to File and Collect

When an Unpaid Invoice Becomes a Court Case

You sent the invoice. You followed up. You sent another follow-up. Weeks have passed, and the client is either ignoring you or making excuses. At some point, the polite email chain has to end and the legal process begins.

Unpaid invoice claims are among the most straightforward cases in Wisconsin small claims court. They are contract claims (or open account claims) under Wis. Stat. Chapter 799, subject to the $10,000 cap (rising to $15,000 on January 1, 2027). The six-year statute of limitations under Wis. Stat. § 893.43 generally starts when the contract is breached — often when the invoice becomes due and remains unpaid. A partial payment made before the period expires can restart the six-year period, so there is no reason to wait.

Send the Demand Letter

A demand letter is not legally required in Wisconsin, but it accomplishes two things: it sometimes shakes loose the payment without court, and it shows the court commissioner you made a reasonable effort to resolve the dispute before filing.

Your demand letter should include:

• The client's full legal name (verify business entities on dfi.wi.gov)
• The invoice number, date, and amount owed
• A description of the services you performed
• A clear payment deadline (14 to 30 days)
• A statement that you intend to file in small claims court if the invoice is not paid

Mail it by certified mail or first-class with a certificate of mailing. Keep the receipt.

Filing the Claim

Complete Form SC-500 (Summons and Complaint). Check "Money Judgment." In the factual statement, keep it simple: you performed services under an agreement, you invoiced the client, the invoice is unpaid, and you are owed a specific dollar amount.

Venue: file in the county where the client resides or where the work was performed (Wis. Stat. § 799.11). If you are a freelancer in Dane County and the client is in Milwaukee County, you can file in either — wherever the cause of action arose (the work was delivered) or where the defendant lives.

Cost: $94.50 total filing fees ($22 base + $51 court support + $21.50 JINFO), plus $2–$15 for clerk-mailed service per defendant where local rules allow and the defendant resides in the county.

If the client is a corporation or LLC, verify the exact entity name and registered agent on dfi.wi.gov. Serve the registered agent — not the person you dealt with, unless they are also a named officer.

Pre-Judgment Interest

If your contract specifies an interest rate for late payment, you can claim that amount. If it does not, Wisconsin's default legal rate under Wis. Stat. § 138.04 is 5% per annum. Include the interest calculation in your claim — the court will not calculate it for you.

What Evidence to Bring

Unpaid invoice cases are won on paper. Bring three copies of:

• The contract or agreement — a signed contract is ideal, but an email thread showing the agreed scope and price works
• The invoice(s) with dates and amounts
• Proof of delivery — emails confirming the work was completed, client sign-offs, deliverable files, screenshots of the finished product
• Payment history — partial payments, if any, with bank records showing the amounts received
• All follow-up communication — emails, texts, and voicemails where you requested payment
• Your demand letter and proof of mailing

The key gap to close is proof that the client accepted the work. If they used the deliverable, responded positively to it, or never complained about quality, document that.

What to Expect at the Hearing

The commissioner looks at three things: was there an agreement, was the work performed, and was the invoice unpaid? If you can prove all three, the math is straightforward.

If the client does not appear on the return date, you can move for a default judgment with your proof of service and an affidavit of damages. If they do appear, they either admit the debt (immediate judgment) or contest it (pretrial conference or trial scheduled).

One caution from Wisconsin litigants: "Getting a small claims judgment is the easy part. Getting the debt repaid is the hard part." If the client does not pay voluntarily after a judgment, enforcement tools like wage garnishment and bank levies are covered in the Wisconsin Small Claims Judgment Collection Guide.

For the complete filing walkthrough — demand letter, forms, fees, service deadlines, and hearing prep — see the Wisconsin Small Claims Filing Guide.

See more Wisconsin guides →