Late Fees on Invoices in Idaho
What Idaho contractors and small businesses need to know about charging late fees, interest rates, prompt payment laws, and mechanics lien deadlines.
Max Interest Rate
12% per annum (default legal rate); higher by written contract
Small Claims Limit
$5,000
Small Claims Department (Magistrate Court)
Mechanics Lien Deadline
90 days from completion for GCs; 75 days for subs
Idaho Prompt Payment Act
Idaho Prompt Payment Act, Idaho Code § 67-2302
Idaho requires state agencies to pay within 60 days. Private construction is governed by contract terms with mechanics lien enforcement under Idaho Code § 45-501.
Late fee rules for Idaho invoices
Idaho allows contractual late fees. The default 12% per annum rate is relatively high, providing a natural incentive for prompt payment.
Idaho's legal interest rate is 12% per annum when no rate is specified. Written contracts may specify a different rate without a usury cap for commercial transactions.
Important disclaimer
This page provides general information about Idaho late fee rules. It is not legal advice. Laws change, and your specific situation may have unique factors. For disputes involving significant amounts, consult a licensed attorney in Idaho.
Demand letters and mechanics liens in Idaho
Idaho does not require a demand letter before filing a mechanics lien. However, sending a demand is best practice.
Mechanics lien deadline: 90 days from completion for GCs; 75 days for subs. A claim of lien must be filed with the county recorder.
Sample late fee clause for Idaho invoices
“Payment is due within the terms specified above. A late fee of 1.5% per month (12% per annum (default legal rate); higher by written contract maximum per Idaho law) will be applied to all balances remaining unpaid after the due date. Pursuant to Idaho Code § 45-501 et seq. (Mechanics' Liens), the undersigned reserves all rights to pursue collection including but not limited to mechanics lien filing, small claims action (up to $5,000 in Small Claims Department (Magistrate Court)), and referral to collections.”
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Start Free TrialFrequently asked questions — Idaho
What is the maximum late fee I can charge on an invoice in Idaho?▾
In Idaho, Idaho's legal interest rate is 12% per annum when no rate is specified. Written contracts may specify a different rate without a usury cap for commercial transactions. Always disclose late fee terms in your contract or invoice before work begins.
Does Idaho have a prompt payment act?▾
Yes. Idaho requires state agencies to pay within 60 days. Private construction is governed by contract terms with mechanics lien enforcement under Idaho Code § 45-501.
What is the small claims court limit in Idaho?▾
The small claims court limit in Idaho is $5,000. Claims are filed in Small Claims Department (Magistrate Court). You generally do not need an attorney for small claims.
How long do I have to file a mechanics lien in Idaho?▾
In Idaho, 90 days from completion for GCs; 75 days for subs. A claim of lien must be filed with the county recorder.
Do I need to send a demand letter before filing a lien in Idaho?▾
Idaho does not require a demand letter before filing a mechanics lien. However, sending a demand is best practice.