Late Fee Calculator

Late payments are one of the top causes of cash-flow stress for freelancers. A consistent late-fee policy shifts the cost of delay back to the client and gives you a lever short of collections. Most clients pay on time when they know a fee applies after a certain date.

Keep late fees reasonable — 1.5% per month is common and enforceable in most states. Excessive fees may not hold up in small claims court. Include the late-fee clause in your contract and on every invoice so there is no surprise.

Calculate interest on overdue invoices with custom rates and days overdue.

How to use this tool

Fill in the form fields with your details.
Review the live preview as you type.
Use the action buttons below to download, print, or reset.

All calculations happen in your browser. No data is sent to any server.

Late Fee Calculator

Invoice Details

Invoice Amount

Days Overdue

Days since the due date.

Monthly Late Fee Rate (%)

Results

Original Amount$1,000.00

Late Fee$7.50

Total Due$1,007.50

Late Fee Calculator FAQ

What is a typical late fee?

A typical late fee for freelancers is 1.5% per month on the outstanding balance. Some contracts specify a flat late fee or a percentage per month. Always include late payment terms in your contracts.

Can I charge interest on overdue invoices?

Yes, but only if your contract or terms specify it. State laws vary on maximum interest rates. Check your local regulations and clearly communicate your late fee policy before starting work. Yes, if your terms state it upfront. For contract language and invoicing best practices, see How to Invoice as a Freelancer.

How do I calculate late fees?

Multiply the overdue amount by the monthly rate, then prorate by days overdue. For example: $1,000 × 1.5% × (15 days / 30) = $7.50 late fee.