Late fee on invoice: when and how to add one

A late fee works when the customer agreed to it before the job. Added after the fact, it mostly starts an argument.

3 min read

The short answer

You can put a late fee on invoice terms when the customer agreed to it in writing before the work, and the fee follows your state's rules. Put it in your terms, repeat it next to the due date on every invoice, and send a friendly reminder before you ever charge it.

On this page

Late fees on invoices: put them in writing first
Late payment fee wording for your invoice
How much is a late fee? It depends on your state
Writing a late fee policy
How to charge late fees on invoices

Late fees on invoices: put them in writing first

The fee has to be in the deal before the job, not just on the bill after it. Put it in your estimate or quote terms, and have the customer say yes to those terms. Then the invoice only repeats what they already agreed to.

In your terms. On the estimate or quote they signed or said yes to.
On every invoice. Right next to the due date, in the same words.
On the reminder. One line, so it's never a surprise.

Late payment fee wording for your invoice

Keep it to one plain sentence next to the due date. Customers skip a paragraph of fine print. They read a line that sits by the date.

Invoice terms

Due: [Due date]
Late fee: Payments after [due date] add a late fee of [late fee], as agreed in our terms of [estimate date].
How to pay: [Check, card, bank transfer or your payment link]

How much is a late fee? It depends on your state

There's no single right amount. Many states limit late fees or interest, and the rules can differ for homeowners and businesses. Some shops use a flat fee, others a share of the unpaid balance. Whatever you pick, check it with your accountant or a lawyer for your state before you put it in your terms.

Writing a late fee policy

A short policy keeps you consistent, so a late fee never feels personal. Decide it once and write it down.

When it starts. How many days after the due date.
How much. A flat amount or a share of the balance, within your state's rules.
When you'll waive it. Many owners waive a first one for a good customer who pays right away.
Who decides. One person, so every customer gets the same answer.

How to charge late fees on invoices

Most late payments are forgotten, not refused. So remind first. If it stays unpaid after your reminders, add the fee as its own line on an updated invoice, with the original due date shown. The reminders are the part that slips, because they need to go out on the right day, every time.

By hand5 steps

Check which invoices are past due
Work out how late each one is
Write a reminder that stays friendly
Send it
Remember to follow up next week

Every week, for every open bill.

Set up onceWaiting on you

Two friendly notes, still unpaid. This one is a bit firmer. Send it?

Hi Dana, the invoice for the drain repair is now 3 weeks past due. Can you pay it this week? Here's the link again.

Reminders drafted on the right day, friendly first. A person sends each one.

See the overdue invoices job →

NextReminders ready for every late invoiceSee how the overdue invoices job keeps it friendly first and firmer later.

Questions about late fees on invoices

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Put the late fee in your terms before the work starts, then repeat it on every invoice next to the due date. If a payment is late, send a friendly reminder first. If it stays unpaid, add the fee as its own line on a new or updated invoice, with the original due date shown.

Usually, if the customer agreed to them before the work and the fee follows your state's rules. A fee you add after the fact, with no written terms, is much harder to collect. Rules vary by state and by type of customer, so check with your accountant or a lawyer before you rely on one.

It depends on your state, and sometimes on the type of customer and the contract. Many states limit late fees or interest, and the fee usually has to be in terms the customer agreed to before the work. Check with your accountant or a lawyer for your state before you set an amount.

A charge added when a customer pays after the due date in your agreed terms. It can be a flat amount or a percentage of the unpaid balance, depending on what your terms say and what your state allows. It is separate from interest, though some businesses use both.

Yes. Most late payments are forgotten, not refused, and a kind reminder fixes many of them. In a Commonhouse setup, AI drafts the reminder the day an invoice goes past due, and a person on your team reads it and sends it before any fee is added.