Wisconsin · Unpaid invoice

Unpaid invoice in Wisconsin small claims

Client won't pay your invoice? Collect it in small claims.

If a client or customer has not paid an invoice for work you delivered or goods you sold, small claims court is a low-cost way to collect. You do not need a lawyer. The strength of your case usually comes down to clear proof: the agreement or terms, the invoice, evidence the work or goods were delivered, and a record of your attempts to collect.

In Wisconsin, small-claims cases are heard in the Circuit Court (Small Claims) and you can sue for up to $10,000 (for money claims; $5,000 for tort or personal-injury claims).

Unpaid invoice: steps that matter

  1. Send a final written demand (a clear statement of what is owed and a payment deadline) and keep proof you sent it.
  2. Gather your contract or written terms, the invoice, delivery/completion proof, and any messages showing the other side accepted the work.
  3. Confirm you are within the statute of limitations below before you file.
  4. File in the correct court for where the defendant is or where the work happened, and keep every date and document together.

Filing your Summons and Complaint (Small Claims), form SC-500 (or SC-500I with instructions) in Wisconsin

  1. Confirm your claim qualifies and identify the right party and county. Verify the claim is within small claims limits ($10,000 or less for money; $5,000 or less for tort/personal injury). Money-judgment cases are generally filed in the county where a defendant resides or where the claim arose (consumer claims have special venue rules). Per SC-6000V: 'It is important that you sue the right party. Naming the wrong party could result in the dismissal of your case.'
  2. Complete the Summons and Complaint (SC-500 or SC-500I). Per SC-6000V: 'Complete the Summons and Complaint, (SC-500) form or Summons and Complaint (with Instructions), (SC-500I) form and make two (2) copies for each defendant.'
  3. File with the clerk of court and pay the filing fee. Per SC-6000V: 'Take the original and copies to the clerk of court's office for filing and payment of the filing fee.' Alternatively, file and pay online through the Wisconsin circuit court eFiling system. If you cannot afford the fee, file a Petition for Waiver of Filing Fees and Costs (CV-410A).
  4. Arrange for service of the Summons and Complaint on the defendant. Per SC-6000V the next step after filing is that the 'Plaintiff arranges for service of documents.' Service requirements (mail or personal service via sheriff/process server) are detailed in the Pre-Judgment: Basic Steps to Small Claims Service guide (SC-6050V), and proof of service must be filed.
  5. Attend the return date / respond as the court directs. The Summons states whether parties must appear in person on a return date or may respond in writing per local court rules. If the defendant does not respond or appear, 'Court grants a default judgment for the plaintiff'; if disputed, the court schedules a trial.

Filing fees: Filing and service fees are set locally and vary; confirm the current amount with the court. A fee waiver is available if you cannot afford the costs.

Deadline that applies to your unpaid invoice

An unpaid invoice is usually a contract or account claim. If you had a signed agreement or written terms, the written-contract statute of limitations below typically applies; a purely verbal deal usually falls under the oral-contract period. That statute is the deadline to file, so do not wait too long.

Written contract: 6 years (Wis. Stat. § 893.43)

Answering a lawsuit: Set by the Summons / local court rule (no single fixed statewide deadline). The Summons states the return date and whether the defendant must appear in person or answer in writing, and where to file; failing to answer or appear by that date may result in a default judgment.

Serving the defendant: After filing, the plaintiff is responsible for arranging service of the Summons and Complaint on each defendant (by mail or by personal service through the sheriff or a process server), and proof of service must be filed. Procedures are detailed in the Pre-Judgment: Basic Steps to Small Claims Service guide (SC-6050V).

Appeals: A small claims judgment may be appealed to the Wisconsin Court of Appeals. For most small claims (money) judgments the general appeal deadline applies: an appeal must be initiated within 45 days of entry of the final judgment or order if written notice of entry is given within 21 days (s. 806.06(5)), or within 90 days if such notice is not given (Wis. Stat. § 808.04(1)). NOTE: eviction judgments are different - under Wis. Stat. § 799.445, an appeal of an order for restitution of the premises must be initiated within 15 days of entry; confirm which rule applies to your case type before relying on a deadline.

This page is general information, not legal advice, and CaseBySelf is not a law firm. Rules, fees, and deadlines change and vary by court: verify with the specific court where you file. Source: Wisconsin Court System - Small Claims Self-Help Law Center. Last reviewed 2026-06-23.