Everything freelancers and small businesses need to know about charging late fees, interest rates, and collecting overdue invoices in Wisconsin.
This information is provided for general educational purposes only and does not constitute legal advice. Laws change frequently. Consult a licensed attorney in Wisconsin for advice on your specific situation. Last reviewed: 2026.
Usury laws cap the maximum interest rate that can be charged on overdue payments in Wisconsin.
12% general; 18% for business loans
Wisconsin's usury limit is 12% (Wis. Stat. § 138.04). Business loans may allow up to 18% (Wis. Stat. § 138.056).
Business loans of $25,000+ may charge up to 18%. Licensed lenders and banks have separate rate structures.
Understanding what you can and cannot charge for late payments in Wisconsin.
Late fees are permitted when agreed upon in contracts. Consumer transactions have additional protections.
No statutory cap for commercial transactions; reasonableness applies.
Liquidated damages analysis. Fees must not be punitive.
Wisconsin Prompt Payment Act sets deadlines and penalties for late payments in Wisconsin.
30 days for state contracts.
Interest at 12% per annum.
Wis. Stat. § 16.528 requires state agencies to pay within 30 days. Subcontractors must be paid within 7 days of the prime contractor receiving payment.
Certain industries in Wisconsin have additional rules around payment timelines, liens, and collection procedures.
Construction: Wis. Stat. § 779.02 provides mechanics' lien rights with a 6-month filing period.
Dairy and agriculture: Wisconsin's agricultural businesses may have seasonal payment terms.
Manufacturing: Wisconsin's manufacturing sector typically uses standard Net 30 commercial terms.
Use this compliant wording on your invoices to clearly communicate your late fee policy in accordance with Wisconsin law.
Payment is due within 30 days. A late fee of 1% per month (12% per annum) will be assessed on unpaid invoices, as permitted under Wisconsin law (Wis. Stat. § 138.04).
This wording works because it clearly states the rate, when it applies, and references Wisconsin legal standards. Always ensure your stated rate complies with Wisconsin's usury limits.
Practical tips for invoicing within Wisconsin's legal framework.
Before you can charge a late fee in Wisconsin, your client needs to have agreed to the terms. Include your late fee clause directly on your invoice and in your contract.
Wisconsin caps interest rates at 12% general / 18% business. Charging above this limit can void your right to collect interest entirely and may expose you to penalties.
A reminder 3 days before the due date and a follow-up the day after dramatically reduces late payments. Automated reminders ensure nothing slips through the cracks.
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Compare Wisconsin's rules with neighboring and commonly referenced states.
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