Late Payment Fee Calculator

Calculate exactly how much a client owes on an overdue invoice — including interest, flat fees, and days overdue.

📋 Invoice Details

$
Common: 1-2% monthly or 12-18% annually
Many freelancers charge $25-75 flat fee per late invoice
$

🚨 Amount Owed

Total Amount Due
$0
Original + interest + fees
Days Overdue
0
Interest Accrued
$0
Original invoice$0
+ Interest (0% monthly x 0 days)$0
+ Flat late fee$0
Total owed$0

Send a professional invoice with the updated amount.

Create Invoice →

How to Handle Late Payments as a Freelancer

Late payments are the #1 cash flow killer for freelancers. Here's how to protect yourself and get paid faster.

Prevention: Set Clear Terms Upfront

The best time to deal with late payments is before they happen. Include these terms in every contract and invoice:

Pro Tip: State Your Terms on the Invoice

Add a line like: "A late fee of 1.5% per month will be applied to balances overdue by more than 14 days." This makes your late fees legally enforceable in most jurisdictions and reminds clients to pay on time.

Collection: A Proven 4-Step Process

If a client is late, follow this escalation sequence:

Legal Limits on Late Fees

Interest rates you can charge vary by jurisdiction:

Frequently Asked Questions

How much interest can I charge on a late invoice?
In the US, 1-1.5% per month (12-18% annually) is standard and generally legal, as long as it was stated in your contract or on the invoice. Always check your local usury laws. The rate must be "reasonable" — courts can void excessive penalties.
Can freelancers legally charge late payment fees?
Yes. Freelancers have the same right as any business to charge late fees. The key is that the terms must be agreed upon before the work — ideally in a signed contract and restated on each invoice. You cannot retroactively add fees that weren't in the original agreement.
What's a reasonable flat late fee?
$25-75 per overdue invoice is standard for freelancers. This covers the administrative cost of chasing payment. Some freelancers charge a percentage instead (e.g., 5% of the invoice amount as a one-time fee). Keep it reasonable so it's enforceable.
Should I charge simple or compound interest?
Simple interest is standard and easier to justify legally. Compound interest (interest on interest) is more aggressive and may be challenged in some jurisdictions. This calculator uses simple interest, which is the safest approach.
How do I add late payment terms to my invoices?
Add a line in the payment terms section: "Payment due within [14/30] days. A late fee of [1.5%] per month plus [$50] flat fee will be applied to balances overdue by more than [14] days." ZapInvoice lets you add custom payment terms to every invoice for free.

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