The short answer: send three reminders, each firmer than the last — a friendly nudge days after the due date, a firm follow-up naming the balance and your contact, then a firmer notice setting a clear date. Keep every email factual, specific, and easy to act on.
Reminder emails fail for predictable reasons: no invoice number, no amount, three different asks, or a tone that puts the recipient on the defensive. The templates below fix those problems. Copy them, fill the placeholders, and adjust the wording to your relationship — the structure does the work.
Five rules before you send
- Facts in the first two lines. Invoice number, amount, due date. Someone forwarding your email to their accounts-payable team should not have to hunt for them.
- One ask per email. Either confirm a payment date, or tell me what is blocking approval — not both in competing paragraphs.
- Make acting easy. Payment method or link, remittance details, and a named human to reply to.
- Assume oversight until proven otherwise. Most late payments are process problems. Wording that presumes bad faith ends the conversation you need.
- Leave a trail. Reference earlier emails by date so the thread reads as a record, not a nag.
The three stages
| Stage | Placement | Tone | Goal |
|---|---|---|---|
| 1. Friendly nudge | A few days after the due date | Warm, light, assume the best | Confirm the invoice arrived and is in the queue |
| 2. Firm follow-up | About a week after the first, unanswered | Neutral and specific | Get a payment date or the real blocker |
| 3. Firmer notice | After two or more attempts go unanswered | Direct, still professional | Set a date and state what happens next |
Treat the cadence as a starting point and adjust it to your terms and the relationship. After stage 3, the last message inside the relationship is a separate document: see how to write a final payment reminder email.
Stage 1: the friendly nudge
Subject lines
- Invoice [INVOICE-NUMBER] — quick payment check
- Following up: invoice [INVOICE-NUMBER], due [DUE-DATE]
- Payment status for invoice [INVOICE-NUMBER]
Hi [FIRST-NAME],
I hope things are going well. Our records show invoice [INVOICE-NUMBER] for [AMOUNT] was due on [DUE-DATE], and we have not recorded a payment against it yet.
If payment is already scheduled, thank you — could you share the expected date so we can update our records? If the invoice needs a PO reference or another copy for your files, reply and I will send it today.
Payment details are on the invoice at [PAYMENT-INSTRUCTIONS].
Best regards,
[YOUR-NAME] · [TITLE] · [COMPANY] · [PHONE]
Customization notes: this stage works because it gives the recipient an easy face-saving exit ("already scheduled"). Keep it under 120 words. If you have a friendly history with this contact, one sentence referencing it helps; do not open with flattery when the invoice is large.
Stage 2: the firm follow-up
Subject lines
- Second reminder: invoice [INVOICE-NUMBER] ([AMOUNT])
- Re: invoice [INVOICE-NUMBER] — payment status
- Invoice [INVOICE-NUMBER] still outstanding
Hi [FIRST-NAME],
I followed up on [DATE-OF-FIRST-EMAIL] about invoice [INVOICE-NUMBER] for [AMOUNT], due [DUE-DATE]. The balance is still showing as unpaid on our statement.
If something about the invoice is blocking approval — a missing PO, a delivery or scope question, an approval sitting with someone else — reply and tell me what you need and we will take care of it. Otherwise, please confirm the date payment will be issued.
If it is easier to talk it through, I am at [PHONE] on [AVAILABILITY].
Thank you,
[YOUR-NAME] · [TITLE] · [COMPANY] · [PHONE]
Customization notes: name the earlier email by date — it turns the thread into a record. The blocker list (PO, delivery, scope, approval) is the point of this stage: it invites the honest answer instead of another silence.
Stage 3: the firmer notice
Subject lines
- Final reminder: invoice [INVOICE-NUMBER] — response requested by [DATE]
- Action required: invoice [INVOICE-NUMBER] remains unpaid
- Invoice [INVOICE-NUMBER] ([AMOUNT]) — payment date needed
Hi [FIRST-NAME],
Despite reminders on [DATE-1] and [DATE-2], invoice [INVOICE-NUMBER] for [AMOUNT] remains unpaid, and we have not received a response.
Please arrange payment by [DATE], or reply with the specific date payment will be issued. If we do not hear from you by [DATE], we will review this account for escalation to an outside collection partner.
We would much rather resolve this directly with you.
Regards,
[YOUR-NAME] · [TITLE] · [COMPANY] · [PHONE]
Customization notes: only state a consequence you are actually prepared to carry out. If the account genuinely is headed for review, this line is fair; if it is a bluff, it will cost you credibility at the stage where you still have leverage. The full last-chance version — with the complete history — is covered separately in the final payment reminder guide.
What not to put in a reminder email
- Threats of legal action you have not taken, or consequences you cannot deliver.
- Sarcasm, all-caps, or wording that accuses the contact personally.
- Copying the customer's customers, partners, or other unrelated parties.
- New demands stacked on top of an open dispute — resolve that track first.
- Amounts that do not match your statement. Check every figure before sending.
Combine channels
Email alone stalls when the contact has changed or the inbox is unmonitored. Pair stage 2 or 3 with a short phone conversation using a professional collection call script for overdue invoices, then send a same-day email confirming whatever was agreed. If you are unsure why responses have stopped, the causes-and-remedies decision tree for unpaid invoices will point you at the likely one.
Next steps
Reminders are stage 3 of an eight-stage sequence — the rest, including when to stop emailing entirely, is in how to collect unpaid invoices: a step-by-step workflow, collected under the unpaid invoice recovery guide. And the cheapest reminder is the one you never need: see preventing late customer payments.