Creators & Freelancers

Invoice late fee calculator

Work out the late fee on an overdue invoice from your contracted rate and the days it is late. See the fee, the total now owed, and a note on the legal ceiling that applies in some places, so you can send a correct figure instead of a guess.

Estimated cost

$2,030

Typical range $2,030 – $2,030

Original invoice$2,000
Late fee (rate × days)$30
Flat late fee$0
Total$2,030

See next steps →

Recommended next steps

Some links below are affiliate links. If you buy through them, Calcatrice may earn a commission at no extra cost to you. We only suggest tools that fit your result, and a company can't pay to show up here.

Under about $50, the fee is a nudge, not a threat. A friendly reminder usually collects faster than the fee itself.

InvoicingInvoicing app with reminders↗Automatic reminders collect more than fees do.ContractsPayment terms template↗Put the late-fee clause in before the next job.

What this assumes, and where it could be wrong

Every one of these is a place the number could be off. They are here because you should be able to check our working, not because we are hedging.

A LATE FEE HAS TO BE IN THE CONTRACT BEFORE THE WORK, OR IT IS JUST A REQUEST.

You cannot invent a penalty after an invoice goes unpaid and expect it to stick. The rate has to be agreed in the contract or the terms on the invoice the client accepted, before the work started. If it is not there, the calculator still tells you what a fair fee would have been, but collecting it is a negotiation, not a right

The rate here is monthly, prorated by day. Most contracts quote a monthly percentage (one to one-and-a-half percent is common) and it accrues daily, so a fee 15 days late is half a month's charge. The calculator prorates across a 30-day month, which is how the arithmetic usually reads.

Some states cap late-fee and interest rates, and a rate above the legal ceiling can be unenforceable or worse. This is not legal advice and we do not know your jurisdiction, so treat a high rate as a flag to check your state's limit before you send it, not a number to trust because a calculator produced it.

A flat fee and a running percentage can both apply if your contract says so, but stacking a large flat fee on top of a high monthly rate is where you cross from encouraging payment into looking punitive. Keep it defensible.

The defaults are ours and are a starting point. The invoice amount, the rate, and the days are yours, and the fee is only correct if those match your actual contract and the real calendar.

Frequently asked questions

How much late fee can I charge on an invoice?

Whatever your contract specifies, up to any legal ceiling in your jurisdiction. A monthly rate of one to one-and-a-half percent is common and generally defensible. The fee must have been agreed before the work, in the contract or accepted terms, and some states cap the rate, so a very high number can be unenforceable.

How do I calculate a late fee?

Take the unpaid amount, apply your contracted monthly rate, and prorate it by the days overdue. A $2,000 invoice at 1.5% a month that is 30 days late accrues about $30; at 15 days late, about half that. Add any flat fee your contract specifies. The calculator above does this from your numbers.

Can I add a late fee if it was not in the contract?

You can ask, but you cannot enforce it. A late fee has to be agreed before the work, in the contract or the terms the client accepted. If it was not, the leverage you have is a conversation and, for larger amounts, the usual collection routes, not a penalty you added after the due date passed.

Are there legal limits on late fees?

Often, yes. Many states cap the interest or late-fee rate a business can charge, and exceeding it can make the fee unenforceable. This calculator does the arithmetic but does not know your jurisdiction, so check your state's limit before sending a high rate. It is arithmetic, not legal advice.

Related calculators

Project quoteYour numbers

A fixed bid is your hourly rate in disguise, plus the revisions and fees people forget to bill. Price those in or eat them.

Open the calculator→

Hourly to salaryYour numbers

The 2,080-hour year is a full-time myth for freelancers. Your annual figure is your rate times the hours you actually bill, not the ones on a calendar.

Open the calculator→