Everything freelancers and small businesses need to know about charging late fees, interest rates, and collecting overdue invoices in Iowa.
This information is provided for general educational purposes only and does not constitute legal advice. Laws change frequently. Consult a licensed attorney in Iowa for advice on your specific situation. Last reviewed: 2026.
Usury laws cap the maximum interest rate that can be charged on overdue payments in Iowa.
No cap for written agreements; 5% default
Iowa does not impose a general usury cap for written agreements. Default rate is 5% per annum (Iowa Code § 535.2). Parties may set any rate in writing.
Written commercial agreements are exempt from any rate cap.
Understanding what you can and cannot charge for late payments in Iowa.
Late fees are allowed when specified in a written agreement. No cap on written agreements provides maximum flexibility.
No statutory cap for written commercial agreements.
Standard contract law. Written agreements have wide flexibility but must not be unconscionable.
Iowa Prompt Payment Act sets deadlines and penalties for late payments in Iowa.
30 days for state contracts.
Interest at 1% per month on late government payments.
Iowa requires state agencies to pay within 30 days. Iowa Code § 573.12 provides additional subcontractor protections on public projects.
Certain industries in Iowa have additional rules around payment timelines, liens, and collection procedures.
Construction: Iowa mechanics' lien (Iowa Code § 572.8) requires filing within 90 days. Preliminary notice within 30 days of first furnishing.
Government contracts: 30-day payment with interest penalties.
Agriculture: Iowa has specific provisions for farm commodity dealers and warehouse bonds.
Use this compliant wording on your invoices to clearly communicate your late fee policy in accordance with Iowa law.
Payment is due within 30 days. A late fee of 1.5% per month (18% per annum) will be assessed on unpaid invoices. Per Iowa Code § 535.2, written agreements may specify any interest rate.
This wording works because it clearly states the rate, when it applies, and references Iowa legal standards. Always ensure your stated rate complies with Iowa's usury limits.
Practical tips for invoicing within Iowa's legal framework.
Before you can charge a late fee in Iowa, your client needs to have agreed to the terms. Include your late fee clause directly on your invoice and in your contract.
Iowa caps interest rates at No cap for written agreements / 5% default. Charging above this limit can void your right to collect interest entirely and may expose you to penalties.
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Compare Iowa's rules with neighboring and commonly referenced states.
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