Free Late-Fee Calculator

An overdue invoice shouldn't cost you twice. Enter the invoice details to see the late penalty — then copy a ready-to-send reminder letter. No sign-up, works offline.

Overdue invoice

Invoice amount

Currency symbol

Days overdue

Late-fee rate (% per month)

How the rate applies

Common freelance terms: 1–2% per month. Check your contract — it should state the exact rate.

What they owe

Invoice

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Late penalty

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Total due

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Reminder letter — copy & send

Client name

Invoice number

Template only — review the wording and amounts before sending. Confirm that any late fee is allowed by your agreement and applicable law.