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How to charge late fees on an invoice

A late fee only works if the client agreed to it before the invoice was overdue. Here's what to state up front, typical amounts, and the exact wording to use.

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Rule one: agree on it before the work

A late fee that first appears on an overdue invoice feels like a penalty invented after the fact — and clients push back. Put it in your quote, contract, or estimate, and repeat it in the payment terms of every invoice: "Payment due within 14 days. Overdue balances accrue a late fee of 1.5% per month." Now the fee is just you following the terms both sides accepted.

How much to charge

• Percentage: 1–2% per month on the overdue balance is common (roughly 12–24% per year).
• Flat fee: a fixed amount (e.g., $25) after a grace period — simpler for small invoices.
• Check your local rules: many states and countries cap interest on overdue commercial debt. If you don't want to research it, keep the rate modest.

For most small businesses, the fee is a nudge, not a revenue line. The goal is the invoice getting paid — many will waive the fee once payment arrives, and that's fine.

The wording to use

• In every invoice's payment terms: "Due within 14 days. Overdue balances accrue a 1.5% monthly late fee."
• In the reminder before charging it: "Per the invoice terms, a late fee of 1.5% per month applies to balances past due. To avoid it, you can pay by [date]." — a warning first almost always beats charging silently.
• On the revised invoice: add a line item: "Late fee — 1.5% per month on $1,200, 1 month overdue: $18.00".

How to add the fee to the invoice

1. Send a payment reminder first, referencing the terms — our payment reminder templates cover the exact emails.
2. If it stays unpaid, issue a revised invoice: original line items, then the late fee as its own labeled line.
3. Keep the original invoice number visible ("Revised — replaces INV-1042") so the client's bookkeeper can match them.
4. Reset the due date on the revised invoice — "due on receipt" is reasonable at this point.

When not to bother

Skip the fee for good clients who are a few days late once, and for first offenses where a friendly reminder does the job. Save it for chronic late payers — where it changes behavior — and for large balances where the delay has a real cost. A fee you apply inconsistently but predictably (warn first, then charge) protects the relationship and your cash flow.

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