Late Payment Reminders for Overdue Invoices

Send the invoice as soon as the work is done, to whoever actually pays it, which may be accounts payable rather than the person who hired you. Include the invoice number, any purchase order (PO) number, the due date as a calendar date, and the ways to pay.

Then check in about a week before the due date. The Small Business Commissioner, a UK public body set up to tackle late payment, recommends a call to ask whether they have everything they need to pay¹. At a larger client, it notes, an invoice can get stuck between departments. If a PO number is missing, you can fix it before the invoice is late.

Before you write, find three things in your contract or on your invoice: the due date, any late fee or interest rate, and anything it says about pausing work. A reminder that quotes terms the client agreed to is hard to argue with. One that invents a fee starts a new argument. Where the contract is silent, some laws fill the gap.

California's law also lets a freelancer who sues over late payment and wins recover up to twice the unpaid amount, plus attorney's fees⁸. In the UK, if you add statutory interest, GOV.UK says to send a new invoice for it².

Decide every step before you send the first email, so each reminder is part of a plan rather than a reaction to silence. Here is a typical rhythm for a freelancer or small firm, counting days from the due date:

1. 1

   Day 1: a friendly reminder

   Assume an oversight. Restate the invoice number, amount and due date, reattach the invoice and ask if anything is missing.

2. 2

   Day 7: a firm follow-up

   Say how many days late it is, quote your payment terms and ask for a payment date in writing.

3. 3

   Day 14: a phone call

   Call your contact, then accounts payable. Find out what's holding the payment up and agree on a date.

4. 4

   Day 21 to 30: the final notice

   Set a deadline about a week away and say what you'll do if it passes.

Address each email to the person who approves payment, copy accounts payable, and keep one thread so the history travels with it. Chasing many customers at once? An accounts receivable collections template sets one rhythm for a whole team.

Keep each email under about 150 words, short enough to read on a phone, with the invoice number in the subject line. Lead with the facts, not an apology: the invoice number, amount and due date, plus how many days late it is from the second email on. Ask for one thing, with a date attached. Then make paying easy, with the invoice reattached and a payment link or bank details.

Cut whatever weakens it: apologies, long explanations of why you need the money, or several requests in one email. Don't resend the same polite note, either. If nothing in your message changes, nothing tells the client the deadline is real.

When two emails get no reply, pick up the phone. The Small Business Commissioner suggests framing the call as an inquiry¹: you're going through your books, a payment seems to be missing, can they help? Have the invoice in front of you and be assertive rather than aggressive. If you promise to call back, do it when you said.

The final notice states calmly what you'll do and on what date, such as pausing further work or adding the late fee your contract sets. Threaten only steps you will take, and never threaten to shame the client in public.

If the client can't pay yet, ask for a date or offer a short payment plan. Confirm each amount and date in writing, along with what happens if a payment is missed. If the final date passes with no payment and no plan, send a formal demand letter for the money you're owed. It's the usual last step before small claims court or a collection agency.

Next time, agree on the due date, a late fee and when work pauses before you start. A freelance contract gives every reminder something to quote. To draft the whole sequence from your own invoice, use the tool at the top of this page.