Firm Payment Reminder Email Template

Your friendly nudge went unanswered and the invoice is now 1–2 weeks late. Time to be direct: restate the facts, name a deadline, and mention what happens next — all without burning the relationship.

Subject: Second reminder: invoice #INV-1042 now 10 days overdue

Hi [Name],

I'm following up on invoice #INV-1042 for [amount], originally due on [due date] — it's now [X] days overdue. I sent a reminder on [date of first reminder] but haven't heard back.

Please arrange payment by [new deadline, e.g. Friday, October 17]. If there's an issue with the invoice or you need a few more days, let me know and we can work something out.

If payment isn't received by then, I'll have to pause any ongoing work and may need to add a late fee per my payment terms.

The invoice is attached again for reference. A quick reply with a payment date would be appreciated.

Regards,
[Your name]

What makes this firmer

It cites the paper trail. Mentioning the first reminder (with its date) shows this isn't your first ask — it quietly documents the history.
It sets a specific deadline. Vague requests get vague responses. A date creates urgency.
It names a consequence. Pausing work or adding a late fee isn't a threat — it's your stated policy. Say it calmly, once.
It leaves a door open. "If you need a few more days, let me know" keeps the relationship intact while still demanding a response.

Tip: Only mention consequences you will actually follow through on. An empty threat you don't enforce teaches the client that your deadlines are optional.

Still nothing after this?

Wait about two weeks, then send a final notice. That's the last step before involving a collections process or pausing the relationship entirely.