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Invoice late fee calculator

Work out the late fee to add to an overdue invoice (a percentage or a flat amount, one-time or per month) and see the new balance your client owes. No signup, no spreadsheet.

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Work out your late fee

Enter the overdue amount and your late-fee terms. The fee and new total update as you type.

Late fee to add
$7.50
1 month × $7.50 · 30 days overdue · ≈ 18% a year
  • Invoice $500.00
  • Late fee $7.50
  • New total $507.50
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How it works

Three steps to a late fee

1

Enter the overdue amount

Type the invoice total your client still owes, the balance the late fee is based on.

2

Set your late-fee terms

Choose a percentage or a flat fee, and whether it’s charged once or per month overdue.

3

Read off the fee and new total

The late fee and the new balance due appear instantly. Add them to your invoice.

Late fees, explained

Charging a fair late fee

A late fee nudges clients to pay on time without souring the relationship. Here’s how the common approaches work for a solo business.

Percentage or flat fee

A percentage fee scales with the invoice: 1.5% of a $500 invoice is $7.50. A flat fee is the same dollar amount on every late invoice, say $25. Percentages are the common choice; a flat fee is the simplest to explain.

Per month, and it adds up

Most late fees are charged per month overdue, like “1.5% per month”. Two months late doubles it. This tool counts each month or part of a month, the usual “per month or portion thereof” wording. 1.5% a month works out to roughly 18% a year.

Agree it up front, keep it reasonable

A late fee only holds up if it’s in your written terms and within your state’s limits, and many cap monthly finance charges. Put the fee on your invoice and contract before the work, keep it modest (1-2% a month is typical), and give a short grace period.

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FAQ

Questions, answered

A common range is 1-1.5% of the balance per month (about 12-18% a year), or a modest flat fee like $25-$50. The fee has to be stated in your agreement and stay within your state’s limits on finance charges. When in doubt, check with a local accountant or attorney.
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