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Calculate a fair late fee on an overdue invoice by amount, rate and days late. Free online with Invoicekin — no sign-up needed.
Enter the invoice amount, your late-fee percentage (monthly or flat) and days overdue. You will see the late fee and the new total due — the same maths Invoicekin Pro applies automatically.
Many freelancers charge 1–1.5% per month. Always state the fee in your terms before work starts.