Invoice Late Fee Calculator

Frequently Asked Questions

What is a typical late fee rate for invoices?

The most common rate is 1.5% per month (18% annualized), but rates vary widely. Some businesses charge a flat fee of $25 to $50; others use 2% per month. Always check local laws, as some jurisdictions cap late interest rates on commercial invoices.

How does a grace period affect the late fee?

A grace period delays when the fee clock starts. If an invoice is 30 days overdue with a 10-day grace period, the fee is calculated on 20 billable days, not 30. Setting a grace period can improve client relationships while still protecting you from serial late payers.

Do I need to state my late fee policy upfront?

Yes. Late fees are only enforceable if they are disclosed in your contract or on the original invoice. Adding a clause like 'Invoices unpaid after 30 days are subject to a 1.5% monthly late fee' protects you legally and sets clear expectations with clients.

What is the effective annual rate of a 1.5% monthly fee?

A 1.5% monthly fee compounds to approximately 19.56% annually (calculated as (1 + 0.015)^12 - 1). The calculator uses a simple (non-compounding) annualized rate of 18%, which is the standard way late fees are stated on invoices.

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