Most invoice follow up emails fail for boring reasons: they land in the wrong inbox, they read like they came from a machine, or they never ask for anything specific. This guide gives you a follow-up cadence that starts before the due date, 12 templates you can copy and adapt, and a plan for when a customer stops replying.
Why most payment reminders fail
Late payment is common right now. In the QuickBooks Small Business Late Payments Report 2026, 59% of US small businesses said they had invoices more than 30 days overdue, up from 47% a year earlier. Very few of those invoices are being ignored on purpose. Most are stuck somewhere.
The usual culprits:
- Wrong recipient. The reminder went to the project manager, not to accounts payable.
- Missing paperwork. No PO number, no proof of delivery, or the invoice was never uploaded to the customer’s supplier portal.
- No clear ask. “Just checking in” gives the reader nothing to do, so they do nothing.
- No rhythm. One reminder at day 45, then three weeks of silence, tells the customer your invoice can wait.
How to write a payment reminder that gets answered
A good payment reminder is short and specific. Before you send one, check five points:
- The subject line shows the invoice number, the amount and the due date or days past due.
- The invoice PDF is attached, every time.
- There is one clear question, such as “Can you confirm the payment date?”
- The tone assumes good faith. Most late payers are busy or disorganized, not dishonest.
- A real person signs it, with a direct phone number. A named sender is harder to ignore than a no-reply address.
A follow-up cadence from before the due date to 30+ days late
This schedule assumes net-30 terms. Shift the timing to match yours, but keep the rhythm: regular, predictable and a little more direct at each step.
| When | What to do | Channel |
|---|---|---|
| 7 days before due | Confirm receipt, approval and payment date (larger invoices) | |
| Due date | Friendly reminder with the invoice attached | |
| 3 days late | Short check, ask for the payment date | |
| 7 days late | Ask what is blocking payment | Email, then phone |
| 14 days late | Call accounts payable, confirm in writing | Phone and email |
| 21 days late | Bring in your main contact or their manager | Email and phone |
| 30+ days late | Final notice, then an owner-level decision | Email, phone, letter |
Log every touch: the date, who you reached, what they said and any promised date. To see how much cash slow payers are holding, run your numbers through the DSO calculator.
12 invoice follow up email templates
Use each one as a payment reminder email template: replace the bracketed placeholders, attach the invoice and adjust the wording so it sounds like you.
1. Before the due date: confirm receipt
Subject: Invoice [Invoice number] for [Amount], due [Due date] Hi [Customer name], A quick note ahead of the due date for invoice [Invoice number] ([Amount], due [Due date]). A copy is attached. Could you confirm it has been received and approved, and let me know if you need a PO number or a portal upload from us? Thanks, [Your name] [Company] | [Phone]
2. Due date reminder
Subject: Invoice [Invoice number] for [Amount] is due today Hi [Customer name], A friendly reminder that invoice [Invoice number] for [Amount] is due today, [Due date]. The invoice and our payment details are attached. If it is already on its way, thank you. Could you send me the payment date so we can match it? Best regards, [Your name] [Company]
3. Three days late
Subject: Invoice [Invoice number] ([Amount]), 3 days past due Hi [Customer name], Invoice [Invoice number] for [Amount] was due on [Due date] and we haven't received payment yet. It may just be timing. Could you let me know when it is scheduled to be paid? Thanks, [Your name]
4. Seven days late
Subject: Invoice [Invoice number] ([Amount]), 7 days past due Hi [Customer name], I'm following up on invoice [Invoice number] for [Amount], due [Due date]. Is anything holding it up on your side, such as a missing PO, an approval or a question about the invoice? If it's already scheduled, a payment date is all I need. Thanks, [Your name] [Phone]
5. Fourteen days late
Subject: Invoice [Invoice number] ([Amount]), 14 days past due Hi [Customer name], I tried to reach you by phone today about invoice [Invoice number] for [Amount], which is now 14 days past due. Could you reply with a payment date, or put me in touch with the person in accounts payable who handles it? Thank you, [Your name] [Phone]
6. Twenty-one days late
Subject: Invoice [Invoice number] ([Amount]), 21 days past due Hi [Customer name], Invoice [Invoice number] for [Amount] is now three weeks past due, and I haven't been able to get a payment date after my messages on [Dates]. I've copied [Manager name] so we can resolve this together. Could one of you confirm by [Date] either the payment date or what is preventing payment? Regards, [Your name] [Company]
7. Short phone call script
Hi [Customer name], this is [Your name] from [Company]. I'm calling about invoice [Invoice number] for [Amount], due on [Due date]. Do you have two minutes? 1. Can you see the invoice in your system? If not: where should I send it? 2. Is it approved for payment? If not: what's missing, and who approves it? 3. When is it scheduled to be paid, and how? Thanks. I'll email you now to confirm [Promised date]. Voicemail: [Your name], [Company], about invoice [Invoice number]. Please call me at [Phone]. I'm emailing you as well.
8. Dispute acknowledgement
Subject: Re: Invoice [Invoice number], your question Hi [Customer name], Thank you for flagging [the issue, e.g. the quantity on line 3]. I've passed it to [Name or team] and you'll hear back from us by [Date]. In the meantime, could you approve the undisputed part of the invoice, [Undisputed amount], for payment? Thanks, [Your name]
9. Payment promise confirmation
Subject: Confirming payment of invoice [Invoice number] on [Promised date] Hi [Customer name], Thanks for your time today. To confirm what we agreed: invoice [Invoice number] for [Amount] will be paid by [Payment method] on [Promised date]. If anything changes, please let me know before that date. Best, [Your name]
10. Partial payment received
Subject: Payment received on invoice [Invoice number], balance [Balance] Hi [Customer name], Thank you, we received [Amount paid] on [Date] toward invoice [Invoice number]. The remaining balance is [Balance]. Can you confirm when the balance will be paid, or whether part of it is on hold? Thanks, [Your name]
11. Final notice before escalation
Subject: Final notice: invoice [Invoice number] ([Amount]), [X] days past due Hi [Customer name], Invoice [Invoice number] for [Amount] is now [X] days past due. We contacted you on [Dates] and have not yet agreed a payment date. We value working with you and would like to settle this directly. Please pay the balance, or contact me by [Date] to agree a payment date or a payment plan. If we don't hear from you by then, the account will be passed to [Owner name] to review next steps, which may include placing new orders on hold as set out in our terms. Sincerely, [Your name] [Company] | [Phone]
Only mention a next step you are prepared to take and that your signed terms allow. For formal collection, talk to an attorney or a licensed collection agency first, since the rules vary by state and province.
12. Thank you after payment
Subject: Thank you, invoice [Invoice number] is paid Hi [Customer name], We received your payment of [Amount] for invoice [Invoice number]. Thank you for your help getting it processed. If there is an easier way for us to send future invoices, such as a specific inbox or reference, just let me know. Best regards, [Your name]
Subject line tips for payment reminder emails
- Lead with the invoice number. Accounts payable teams search by it.
- Include the amount. “Invoice 2318 ($8,450)” is easier to act on than “Outstanding balance.”
- State the status plainly. “Due today” or “14 days past due” is clear without sounding hostile.
- Skip the alarm words. “URGENT” and all-caps subjects look like spam and put people on the defensive.
- Keep one thread per invoice. The customer sees the full history in one place.
What to do when there is no reply
Silence usually means one of three things: your email isn’t reaching the right person, the invoice is stuck in an approval, or the customer is short on cash. A fourth identical email fixes none of them.
- Check the address. Ask your contact who processes supplier invoices and whether there is an AP inbox or a portal.
- Change the channel. If two emails get no answer, call. If you reach voicemail, leave a short message, then email to say you called.
- Go one level up. Copy your contact’s manager, politely, as in template 6.
- Look at the whole account. If several invoices slip at once, cash may be the problem. A payment plan agreed in writing beats more silence.
When to stop emailing and call
A good rule of thumb: pick up the phone once an invoice is about a week past due with no reply, or right away if the amount is big enough to hurt your cash flow. A five-minute call usually tells you more than three emails: who has the invoice, whether it is approved and when their next payment run is. Then confirm what you heard with template 9.
Past 30 days with no engagement, an invoice needs an owner-level decision, and possibly a conversation with an attorney or a licensed collection agency about formal options.
Rather not run this cadence yourself? Our invoice follow-up service handles it by email and phone, in your company’s name, as part of the outsourced accounts receivable work Extra Myle does for B2B companies.
Not sure where your overdue invoices are stuck?
We will go through your open invoices with you and show you what is overdue, why, and what we would do first.
Book a free AR reviewFAQ
How soon after the due date should I send a follow-up email?
Remind on the due date and follow up about three days later. After that, keep a weekly rhythm and switch to the phone once an invoice is around a week late with no reply.
Can I use these invoice follow up email samples as they are?
Yes. Most owners only adjust the greeting and sign-off to match how they normally write, and add their payment details or portal instructions.
Should I mention late fees in a payment reminder?
Only if late fees are in the terms or contract your customer agreed to. Rules on fees and interest vary by state and province, so check with an attorney before adding them to your terms.
Is it OK to automate invoice reminders?
Automation works well for pre-due and due-date reminders. Once an invoice is late, a personal email from a named person, followed by a call, is much harder to ignore.
