Free · Instant · Interactive
Invoice Late Fee Calculator - What to Charge
Calculate late fees on unpaid invoices: flat fee, monthly or daily percentage. See the total and the effective annual rate. Free late fee calculator.
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Your inputs
State the late-fee terms clearly on every invoice.
Your result
Late fee
$37.50
Total due
$2,537.50
Effective APR
18.0%
Fee per day
$1.25
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FAQ
What is a standard late fee?
Common terms are a flat fee ($25–50) or 1–2% per month on the unpaid balance. Some states cap the rate — check local rules.
When should I charge a late fee?
After the payment term (e.g., net 30) expires, typically with a grace period and a reminder.
How much can I charge?
Most businesses charge 1.5% per month (18% APR) or a flat fee. Usury limits vary by state.
Do late fees help collect?
Yes — clear late-fee terms on every invoice reduce late payments and compensate you when they happen.
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