Late payment fees and early payment discounts

A late payment costs you something. You paid your own suppliers and staff on time, and you spend hours sending reminders. A late fee puts a price on that, and a discount for paying early does the opposite: it rewards the customer who pays fast. Both can help, and both can go wrong. A fee nobody agreed to starts an argument, and a discount can cost more than the delay did. Here is how to use each one fairly.

When a late fee is fair

A late fee is fair when all four of these are true:

• The customer knew about it before the work started. It was in your quote, your contract or your terms, and not only on the invoice.
• The due date was clear. A date, not just “30 days”. See invoice payment terms.
• The invoice was right and arrived on time. If you sent it late, to the wrong person, or with a mistake on it, the delay is partly yours.
• The amount is reasonable. It covers your cost of waiting. It is not a punishment.

It is not fair, and in many places not allowed, to add a fee the customer never agreed to, or to charge one while they are waiting for you to answer a question about the invoice. If the invoice is in dispute, sort that out first; see what to do when a customer disputes an invoice.

How much is usual

On a $2,400.00 invoice, 1.5% a month is $36.00 for each month it stays unpaid. That is enough to notice and small enough that no reasonable customer feels cheated. Three more choices make a fee easier to accept:

• A few days of grace. Start the fee 7 or 15 days after the due date, not the next morning. Bank transfers take time.
• A limit. Say the most the fee can add up to, for example “up to $200.00”.
• Fees on the invoice amount only. Do not charge a fee on an earlier fee.

Many countries set their own rules. In the United Kingdom, a business can claim interest at 8% above the Bank of England base rate on a late invoice to another business, plus a fixed sum for each invoice. In the European Union, the Late Payment Directive gives businesses interest and at least €40 in recovery costs. In the United States, the limit on what you can charge depends on the state. Rules for selling to consumers are stricter almost everywhere, and in some countries a late fee carries tax while in others it does not. Check with your accountant or a lawyer before you set your rate.

How to word it

Say the same thing in three places: the quote or contract, the invoice, and the reminder. Plain wording works best.

• In the quote or contract: “Invoices are due within 30 days. A late fee of 1.5% a month applies to any amount still unpaid 15 days after the due date.”
• On the invoice, a percentage: “A late fee of 1.5% a month applies after 15 days overdue, up to $200.00.”
• On the invoice, a fixed amount: “A late fee of $40.00 applies after 7 days overdue.”
• In a reminder, before it applies: “Invoice OG/2026/0046 for $2,400.00 was due on Nov 1. The late fee on the invoice applies from Nov 17, so paying this week avoids it.”
• In a reminder, after it applies: “Invoice OG/2026/0046 is now 16 days overdue. With the late fee of $36.00, the amount due is $2,436.00.”

Leave out words like “penalty”. Give the rate, the day it starts and the amount. Our payment reminder messages have the rest of the wording.

Charging it without changing the invoice

When the fee applies, do not open the invoice and raise its total. An invoice that has been sent is a record, and your customer has a copy. Keep the invoice as it is and show the fee as a separate amount against it, with the date it was charged. The customer then sees the invoice amount, the fee and the total due now. If you later drop the fee, the invoice has not changed and nothing needs to be corrected.

When a customer refuses to pay the fee

This is common, and it rarely means they will not pay the invoice. Take it in steps.

• Check your own side first. Was the fee agreed before the work? Was the invoice correct, and did it reach the person who pays? If not, drop the fee.
• Collect the invoice first. Ask for the invoice amount now and treat the fee as a separate question. Money in the bank matters more than winning the point.
• Offer to waive it once. “If the invoice is paid by Friday, we will waive the late fee this time.” Many customers pay the same day.
• Record what arrives. If they pay the invoice but not the fee, the invoice is paid. Then decide whether to keep the fee open or waive it.
• Put the decision in writing. A short note that says the fee was waived, and that it will apply next time, stops the same talk next month.

For a good customer who is late once, waiving the fee costs little and is remembered. For a customer who is late every month, keep the fee, or change the terms instead: ask for a deposit before work starts, or shorten the days they have to pay.

The early payment discount

A discount works the other way. The well-known form is “2/10 Net 30”: 2% off if paid within 10 days, otherwise the full amount within 30. Write it as amounts and a date, so the customer reads the saving at once.

It works best with customers who have cash and watch their costs, and when being paid 20 days sooner really helps you. It is not cheap. Giving up 2% to be paid 20 days sooner is like borrowing at about 37% a year. Three rules keep it under control:

• One date. The discount ends on a set day. A payment that arrives after it is for the full amount.
• The full discounted amount. The discount is earned by paying everything that is due, not a part of it.
• Agreed up front. Like a fee, it belongs in the quote and on the invoice.

If a customer takes the discount after the date, the difference is still owed. Tell them kindly and ask for the balance; our post on why a client paid less covers this. In many countries, a discount that is taken lowers the tax on the sale as well, so ask your accountant how to show it.

Fee, discount, or neither

You can use both on one invoice: a small reward for the first 10 days and a small fee after a grace period. Most small businesses do not need either for most customers. A clear due date, an invoice sent on the day the work is done and a reminder at the right time recover more money than a fee does. Keep the fee for customers who are often late, and the discount for months when cash is tight.

The short version

• A late fee is fair when it was agreed before the work, the due date was clear, the invoice was right and the amount is reasonable.
• 1% to 2% a month, or a small fixed amount, is usual. Add a few days of grace and a limit.
• Write the rate, the start day and the amount in the quote, on the invoice and in the reminder.
• Never change a sent invoice to add a fee. Show the fee as a separate amount.
• If a customer refuses the fee, collect the invoice first, then waive the fee once in writing or keep it.
• An early payment discount needs one end date, and it costs more than it looks.
• The law on fees and interest differs by country. Check yours.