Free Tool
Late Fee Calculator
A client blew past the due date? Work out a fair late fee in seconds. Enter the invoice amount, your interest rate, and how many days overdue it is — and see the fee and the new total owed. No signup, no email wall.
The overdue invoice
12–18%/yr (≈1–1.5%/month) is a common, defensible range.
Total now owed
$2,020
This is a general estimate, not legal advice — late-fee limits vary by state and country, and a fee is only enforceable if it was in your invoice or contract terms beforehand.
How to charge a late fee (without the awkwardness)
Late fees work best as prevention, not punishment. When a client knows there’s a fee waiting, invoices tend to get paid on time. Here’s how to set one up so it actually holds — and rarely has to be used:
- Put it in writing before the work. A late fee is only enforceable if it was in your estimate, contract, or invoice terms up front. Add a line like “A 1.5% monthly fee applies to balances over 30 days late.”
- State the exact due date on the invoice. “Net 15” means nothing to a client who didn’t note the issue date. A bold “Due July 5” does. See what to include on an invoice.
- Send a friendly reminder the day it’s overdue. Most late payments are oversights, not refusals. One polite nudge clears the majority before any fee applies.
- Apply the fee calmly, referencing the agreed terms. If it comes to it, a short note pointing to the terms the client already accepted keeps it professional.
What’s a reasonable late fee?
For freelancers and small businesses, 1% to 1.5% of the overdue amount per month (about 12–18% per year) is a common, defensible rate. A flat fee of $25–$50 is also fine for smaller invoices. The exact ceiling depends on your state or country, so keep it reasonable — the point is to encourage prompt payment, not to profit from lateness.
Get paid before it’s ever late
The surest way to avoid the late-fee conversation is to make paying effortless and automatic. Build a clean invoice with the free invoice generator, set clear terms using the invoicing guide, and let a tool send the reminders for you.
Frequently asked questions
How much can I charge as a late fee?
A common, defensible late fee is 1–1.5% of the overdue amount per month (roughly 12–18% per year), or a flat fee of $25–$50. Whatever you pick, it only holds up if it was stated on the invoice or in your contract before the work — so put your late-fee terms in writing up front.
How is a monthly late fee calculated?
Take your annual interest rate, divide by 12 to get the monthly rate, then multiply by the overdue balance and the number of months late. This calculator does it daily so a partial month is fair — it prorates the annual rate across the exact days overdue.
Should I actually charge a client a late fee?
The threat of a fee often matters more than the fee itself — a clearly stated late fee gets invoices paid on time. When you do apply one, a short, polite note referencing the terms the client already agreed to keeps it professional rather than confrontational.
Do I have to charge a late fee if it’s in my terms?
No — it’s your call each time. Many freelancers waive it for good clients as goodwill and enforce it only for repeat offenders. Having it in your terms simply gives you the option and the leverage.