Most late invoices aren't a client refusing to pay — they're a client who forgot, lost the email, or has your invoice sitting in an approval queue. A short, scheduled sequence of reminders fixes the majority of late payments without a single awkward conversation. Below are four templates: one for the due date itself, then escalating messages at one week, two weeks, and a final notice.
How the 4-stage sequence works
Send each email on a fixed schedule, not when frustration builds. A predictable cadence keeps you professional and keeps the invoice visible:
| Stage | When | Tone |
|---|---|---|
| 1. Due-date nudge | The day the invoice is due | Friendly, assumes good faith |
| 2. First follow-up | 7 days overdue | Direct, asks for a date |
| 3. Second follow-up | 14 days overdue | Firm, mentions consequences |
| 4. Final notice | 21–30 days overdue | Formal, states next steps |
Always attach the invoice PDF again at every stage. Never make the client dig for it.
Template 1: due-date reminder (day 0)
Subject: Invoice INV-0187 is due today
Hi Dana,
A quick note that invoice INV-0187 for $2,400 is due today. I've attached the PDF again for convenience — payment details are at the bottom.
If it's already on its way, thank you and please ignore this. Otherwise, let me know if you need anything from me to process it.
Best, Sam
Keep this one light. Many clients pay on the due date, so the goal is visibility, not pressure.
Template 2: one week overdue (day +7)
Subject: Following up: invoice INV-0187 (7 days past due)
Hi Dana,
Invoice INV-0187 for $2,400 was due on March 3 and I haven't seen the payment come through yet. I've re-attached it here.
Could you let me know when I can expect payment? If there's an issue with the invoice or your approval process needs anything from me, I'm happy to help sort it out.
Thanks, Sam
The key move: ask for a specific date. "When can I expect payment?" is polite but forces a commitment you can follow up on.
Template 3: two weeks overdue (day +14)
Subject: Second reminder: invoice INV-0187 is 14 days past due
Hi Dana,
This is my second reminder about invoice INV-0187 for $2,400, now 14 days past its March 3 due date.
Per the payment terms on the invoice, a late fee of 1.5% per month applies to overdue balances, which I'd rather not have to add. Could you confirm today that payment is being processed, or call me at 555-0142 if something is holding it up?
Regards, Sam
Only mention a late fee if your invoice terms actually included one before the work — see how to charge late fees on invoices. If they didn't, skip that line and instead note that you'll pause any ongoing work until the account is current.
Template 4: final notice (day +21 to +30)
Subject: Final notice: invoice INV-0187, 30 days past due
Hi Dana,
Invoice INV-0187 for $2,400 is now 30 days past due despite three previous reminders (sent March 3, March 10, and March 17).
Please arrange payment within 7 days, by April 9. If I don't receive payment or hear from you by then, I'll have to pause current work and consider further steps to recover the balance.
I'd much rather resolve this simply — reply to this email or call me and we can close it out today.
Regards, Sam
State the history (dates of prior reminders), a hard deadline, and a consequence you're actually willing to follow through on. If this email goes unanswered, move to the escalation ladder in what to do when a client won't pay.
Make the original invoice do half the work
Reminders work best when the invoice itself was unambiguous: a clear due date, exact payment instructions, and terms that mention what happens when payment is late.
Example: invoice built to support a reminder sequence
Clear due date, payment instructions in the notes, and terms that make the reminder schedule and late fee no surprise.
A reminder sequence only runs on time if the invoice went out on time. InvoiceKo generates a clean PDF invoice in your browser — free, no signup, no watermark — with notes and terms fields for your payment instructions and reminder policy. For timing the whole cycle, see the invoice follow-up schedule that keeps you paid.