Can you charge a late fee?
Only if you set it out before the work — usually in your contract or on the invoice itself. State the rate and when it kicks in (for example, “1.5% per month on balances over 30 days”) so it's enforceable.
Thrivelance Tools
Invoice Late Fee Calculator
Work out the late fee on an overdue invoice. Enter the amount, choose a flat fee, a monthly percentage, or an annual interest rate, and the days overdue to see the fee and the new total due — so you can chase payment with exact figures.
Calculate the late fee
Figures update as you type. Choose the fee method your contract specifies.
Late fee
$30.00
Based on method and days.
Total now due
$2,030.00
Invoice + late fee.
Fee per day
$1.00 / day
Late fee ÷ days overdue.
Percentage vs flat fee
A flat fee is simple but can feel harsh on small invoices and trivial on large ones. A monthly percentage scales with the amount owed and the length of the delay, which most freelancers find fairer.
Know the legal cap
Many regions cap the interest you can charge on overdue invoices. Before applying a high rate, confirm the maximum allowed where you and your client are based to keep the fee enforceable.
Avoid late payments altogether
Clear terms and a tidy invoice get you paid faster. Build one with the Free Invoice Generator and state your late-fee policy right on it.
FAQ
Common questions about this calculator.
How do I calculate a late fee on an invoice?
Pick your method: a flat fee is a fixed charge; a monthly percentage applies a percent of the invoice for each 30 days late; an annual interest rate is prorated by the number of days overdue.
What is a reasonable late fee?
A common rate is 1.5% per month, which is about 18% per year. Always check the legal maximum where you and your client operate before applying a higher rate.
Can I charge a late fee if I didn't mention it?
Generally no. To be enforceable, the late fee should be stated up front in your contract or on the invoice itself, including the rate and when it begins.
How do I add a late fee to an invoice?
Create or reissue the invoice with the fee as a line item using the Free Invoice Generator, and note your late-fee policy on it.