Everything freelancers and small businesses need to know about charging late fees, interest rates, and collecting overdue invoices in Idaho.
This information is provided for general educational purposes only and does not constitute legal advice. Laws change frequently. Consult a licensed attorney in Idaho for advice on your specific situation. Last reviewed: 2026.
Usury laws cap the maximum interest rate that can be charged on overdue payments in Idaho.
No statutory cap; 12% default rate
Idaho does not have a general usury cap. The default legal rate is 12% per annum (I.C. § 28-22-104). Parties may agree to any interest rate in their contracts.
Since Idaho has no general usury cap, all commercial transactions can negotiate rates freely.
Understanding what you can and cannot charge for late payments in Idaho.
Idaho allows late fees when contractually agreed upon. With no usury cap, businesses have maximum flexibility in setting rates.
No statutory cap.
Idaho courts apply standard contract law. Fees must not be unconscionable.
Idaho Prompt Payment Act sets deadlines and penalties for late payments in Idaho.
60 days for state contracts.
Interest on late payments from government agencies.
Idaho requires state agencies to pay within 60 days under I.C. § 67-2302. Construction has specific subcontractor protections.
Certain industries in Idaho have additional rules around payment timelines, liens, and collection procedures.
Construction: Idaho mechanics' lien law (I.C. § 45-507) requires filing within 90 days of completion. A preliminary 20-day notice is required.
Government contracts: I.C. § 67-2302 mandates 60-day payment.
Agriculture: Idaho's farming and ranching industries follow standard commercial practices.
Use this compliant wording on your invoices to clearly communicate your late fee policy in accordance with Idaho law.
Payment is due within 30 days of invoice date. A late fee of 1.5% per month (18% per annum) will be applied to invoices unpaid after the due date. Idaho does not impose a general usury cap (I.C. § 28-22-104).
This wording works because it clearly states the rate, when it applies, and references Idaho legal standards. Always ensure your stated rate complies with Idaho's usury limits.
Practical tips for invoicing within Idaho's legal framework.
Before you can charge a late fee in Idaho, your client needs to have agreed to the terms. Include your late fee clause directly on your invoice and in your contract.
Idaho caps interest rates at No cap by statute / 12% default. 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 Idaho's rules with neighboring and commonly referenced states.
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