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The invoice is late. What's the number now?

The amount, the monthly fee in your contract, and two dates. You get days late, the fee accrued so far, the current total, and the exact sentence for the reminder email. Nothing is sent anywhere — the math happens on this page.

The original total, before any fee.

Whatever your signed contract says — check your state's usury limit before setting this number, because 1.5%/month is common and still not legal everywhere.

The date on the invoice, not the date you sent it.

Defaults to today; change it to check what the balance will be on a future date.

Currently owed

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Days late
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Fee accrued to date
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Original invoice
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Enter your numbers.

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Before the next one

A late fee only works if it's in the contract they signed.

The Client-Ready Business Templates include the MSA and invoice with the fee clause already in place — $19, with the standing 14-day refund. Related reading: late fees: what to charge, what to say, when to send it.