Calculate late payment fees on overdue invoices using flat fee, daily, monthly, or annual interest rates.
Effective annual rate: 18.00%
| Invoice Amount | $1000.00 |
| Days Overdue | 30 days |
| Late Fee | $15.00 |
| Total Amount Owed | $1015.00 |
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Daily: Fee = Amount × (Rate% / 100) × Days
Monthly: Fee = Amount × (Rate% / 100) × (Days / 30)
Annual: Fee = Amount × (Rate% / 100) × (Days / 365)
Common late fees are 1.5% per month (18% APR) or a flat fee of $25–$50. Check your contract and local laws.
Yes, if stated in your contract or terms. Most states allow up to 10–18% annual interest on overdue commercial invoices.
Daily Interest = Invoice Amount × (Annual Rate / 365) × Days Overdue.
Yes. Always specify late fee terms in your contract or on your invoice to ensure they are legally enforceable.
Calculations are for educational purposes only. Consult a qualified financial advisor for personalized advice.