Unpaid Invoice Follow-Up: 4 Templates That Work

Before you send anything

Check three things first, because roughly half of “unpaid” invoices are something else. Did the invoice reach the right person, or the founder’s inbox rather than accounts? Does it have a purchase order number if the client’s system needs one? And has the payment actually landed under a name you did not recognise? Chasing a client who already paid you costs more goodwill than waiting another day.

Day 1 overdue: the assumption of good faith

Send this the day after the due date. Short, friendly, and written as if it is an oversight, because it usually is.

Subject: Invoice 0042, due yesterday

Hi [name], just a quick note that invoice 0042 for [amount] was due on [date]. I have attached it again in case it needs forwarding. If it is already in your payment run, ignore me and thank you.

Day 7: ask a question

A week later, switch from statement to question. Questions get replies in a way reminders do not, and the answer tells you what you are actually dealing with.

Hi [name], invoice 0042 for [amount] is now a week overdue. Is there anything holding it up on your side, or anyone else I should be sending it to? Happy to re-issue it if something needs changing.

Day 14: state the consequence

Two weeks in, the tone changes. Still polite, no longer casual, and the terms from the contract appear for the first time.

Hi [name], invoice 0042 for [amount] is now 14 days overdue. Under the terms we agreed on [date], late payment is subject to [late fee], and I will be pausing work on [project] until the balance is settled. I would much rather not do either, so please let me know when I can expect payment.

Only write this if you are willing to do it. A threat you do not act on teaches the client that your deadlines are decorative. This is also the moment the terms you agreed at the start earn their keep, which is why payment terms that get you paid on time is worth reading before the next project rather than after this one.

Day 30: the formal demand

A month overdue is no longer a scheduling problem. Send a final notice in plain, unemotional language: the invoice number, the original amount, accrued interest, the total now due, and a firm date after which you will escalate. Escalation means a solicitor’s letter, a debt recovery service, or your local small claims process, depending on the amount and where you both are.

Keep it factual and free of adjectives. This message may end up being read by someone other than your client, and calm documentation is worth far more at that point than a well-aimed sentence.

Rules that make the sequence work

• Send on the schedule, not on the mood. Diarise the dates the moment an invoice goes out.
• Reply on the same email thread, so the whole history sits in one place.
• Never apologise for asking. You are not requesting a favour, you are collecting for work already delivered.
• After a phone call, email a summary of what was agreed. Verbal promises to pay have a short half-life.
• Keep the invoice, the dates and the status in one place rather than in your memory, so you always know exactly what is outstanding before you press send.

Make the next one easier

Every unpaid invoice is expensive in time before it is expensive in money. Reduce how often it happens: take a deposit, invoice immediately, put a real date on the document, and keep the payment status attached to the client record so a drifting invoice is visible in a glance rather than discovered in a spreadsheet six weeks later.

Sending the invoice quickly matters as much as chasing it well. An invoice generator that turns a finished project into a branded PDF and emails it the same afternoon removes the most common cause of late payment, which is an invoice that went out late. For the wider picture, including when to stop working with someone, see dealing with late-paying clients.