Overdue invoice reminder emails: 8 templates, a timeline, and what to do when customers reply

Count calendar days from the due date. Adjust the gaps to your payment terms, but keep the order.

Use your accounts receivable aging report to see who is at which stage.

Two rules apply at every stage. First, one message per customer: if a customer has five overdue invoices, send one reminder that lists all five (template 8). Second, a reply pauses the sequence for that invoice until someone has read it. Nothing damages a relationship faster than an automated "friendly reminder" sent the day after the customer explained the problem.

• Invoice number, invoice date, due date and the amount still open, copied from your ledger, not typed by hand.
• One clear request: pay, tell us when you will pay, or tell us what is wrong.
• An offer to resend the invoice. "We never received it" is one of the most common answers.
• A reply address a person actually reads. Never use no-reply.
• Your name and direct contact details. People pay people.

Placeholders are in square brackets. Copy the plain text, keep figures exact, and delete any line that does not apply.

Template 1: Courtesy reminder (5 days before due)

Subject: Invoice [number] due on [date] – anything missing?

Hello [first name],

A quick heads-up: invoice [number] for [amount] is due on [date].

If you need a purchase order number, a different billing address or a copy of the invoice to process it, just reply to this email and I will sort it out today.

Thank you,
[Your name]
[Company] | [Phone]

Template 2: Due-date reminder

Subject: Invoice [number] is due today

Hello [first name],

Invoice [number] for [amount] is due today, [date]. If it is already scheduled, thank you – please ignore this message.

If anything is holding it up, reply here and let me know.

Best regards,
[Your name]

Template 3: First overdue reminder (due + 3 days)

Subject: Payment reminder: invoice [number] ([amount])

Hello [first name],

Our records show invoice [number] for [amount], due on [date], as still open. This may simply have crossed with your payment – if so, thank you and please disregard this note.

If not, could you let me know when we can expect payment? I have attached a copy of the invoice for convenience.

Kind regards,
[Your name]

Template 4: Second reminder (due + 7 days)

Subject: Invoice [number] – 7 days overdue, is something blocking it?

Hello [first name],

Invoice [number] for [amount] is now 7 days past its due date of [date].

Is there anything preventing payment – a missing PO number, an approval, an error on the invoice? If you tell me what it is, I will fix it straight away.

Otherwise, please let me know the date you plan to pay.

Thanks,
[Your name]

Template 5: Third reminder (due + 14 days)

Subject: Payment date needed: invoice [number], 14 days overdue

Hello [first name],

Invoice [number] for [amount] (due [date]) is now 14 days overdue, and I have not yet heard back from you.

Please reply by [date + 5 working days] with either:
– confirmation that payment has been made, or
– the date on which you will pay.

If there is a problem with the invoice, reply with the details and we will review it.

Regards,
[Your name]

Template 6: Escalation to a second contact (due + 30 days)

Subject: Invoice [number] – 30 days overdue, request for help

Hello [second contact name],

I am writing because invoice [number] for [amount], due on [date], is now 30 days overdue, and my messages to [first contact] since [date] have not been answered.

Could you confirm who is responsible for this payment, or let me know the payment date? A copy of the invoice is attached.

Thank you for your help,
[Your name]
[Company] | [Phone]

Template 7: Final notice (due + 45 days or per your policy)

Subject: Final notice: invoice [number] ([amount]) – reply by [date]

Hello [first name],

Invoice [number] for [amount], due on [date], remains unpaid despite our reminders of [dates].

Please pay the outstanding amount or contact me by [date]. If we have not received payment or heard from you by then, we will [the next step you will actually take – e.g. put further orders on hold / pass the account to our collections process] as set out in our terms.

If you are having difficulties, I would rather agree a payment plan with you now. Just reply to this email.

Regards,
[Your name]

Only name a step you will really take. An empty threat costs you credibility with exactly the customers you want to keep.

Template 8: One email for several overdue invoices

Subject: [N] open invoices – overview for [customer company]

Hello [first name],

To keep things simple, here are all invoices that are currently open on your account:

Invoice     Date        Due         Amount open
[number]    [date]      [date]      [amount]
[number]    [date]      [date]      [amount]
[number]    [date]      [date]      [amount]
Total open: [total amount]

Could you check these against your records and let me know when they will be paid? If any of them is disputed or already paid, just tell me which one and I will look into it.

Thank you,
[Your name]

Never add up amounts in different currencies. List each currency with its own total.

• Put the invoice number first. Accounts payable teams search their inbox by invoice number.
• State the fact, not the emotion. "Invoice 1042 – 14 days overdue" works; "URGENT!!!" lands in spam or gets ignored.
• Include the amount once the invoice is overdue. It helps the reader prioritise.
• Escalate wording slowly: "due on" → "payment reminder" → "overdue" → "payment date needed" → "final notice".
• Ask a question when you need an answer: "is something blocking it?" gets more replies than a statement.
• Keep it under about 60 characters so the invoice number and stage survive on mobile.
• Reply in the same thread after the customer has answered, so the history stays together.

A reminder that gets an answer has done its job. What matters now is that your next message respects that answer. Here are the five replies you will see most, with what to do and a template for each.

"We'll pay on Friday" – promise to pay

Note the date and amount, pause all reminders for that invoice until the promised date, and check the payment against your next ledger export. Only remind again if the date passes.

Subject: Re: Invoice [number]

Thank you, [first name] – I have noted payment of [amount] on [date]. I will not send further reminders for this invoice before then.

"The invoice is wrong" – dispute

Stop reminding for the disputed invoice and hand it to whoever can resolve it. Undisputed invoices from the same customer can continue. Do not argue in the reminder thread.

Subject: Re: Invoice [number]

Thank you for letting me know, [first name]. I have paused reminders for invoice [number] and passed your comments to [name/role], who will get back to you by [date]. Your other open invoices are not affected.

"I'm not the right person" – wrong contact

Update the contact in your records. Do not send the next reminder to the old address.

Subject: Re: Invoice [number]

Thank you, [first name]. Could you tell me who handles supplier payments for [customer company], or forward this email to them? I will update our records so you do not receive further reminders.

"We already paid" – paid claim

Thank them and ask for the payment date and reference. Do not argue, do not remind again in the meantime, and close the invoice only when the payment shows up in your own books.

Subject: Re: Invoice [number]

Thank you, [first name]. Could you send me the payment date and reference? I will match it on our side and confirm. Until then you will not receive further reminders for this invoice.

Out-of-office auto-reply

Read the return date. If it is short, wait until the person is back. If they name a deputy, send the reminder to the deputy.

Subject: Invoice [number] – while [first name] is away

Hello [deputy name],

[First name]'s auto-reply named you as the contact while they are away. Invoice [number] for [amount] was due on [date]. Could you check whether it is scheduled for payment?

You can only charge late fees or interest where the law or your contract allows it, so check the rules for your country before you mention them in a reminder.

• United States: There is no general federal late-payment law for invoices between private businesses. Late fees and interest come from your contract and from state law, including state usury limits, which differ from state to state. Federal agencies paying their vendors are covered by the Prompt Payment Act, under which the agency generally owes interest when it pays late.
• United Kingdom: Under the Late Payment of Commercial Debts (Interest) Act 1998, a business can claim statutory interest of 8% plus the Bank of England base rate on late business-to-business payments, unless the contract sets a different rate. On top of that come fixed recovery costs: £40 for debts under £1,000, £70 for £1,000 to £9,999.99, and £100 for £10,000 or more.
• European Union: The Late Payment Directive 2011/7/EU gives businesses a right to statutory interest of at least 8 percentage points above the reference rate. Between businesses, this interest is due without a reminder. A fixed minimum of €40 in recovery costs comes on top. Each member state writes these rules into its own law, so check your national version (Germany: §§ 286 and 288 BGB).

This is general information as of October 20, 2026, not legal advice. In a reminder, quote only the terms you actually agreed and the figure you are entitled to.

Not sure you need software? Compare automated payment reminders vs manual follow-up.

TrueDue runs a reminder sequence like this for you and reads the replies.

1. Upload the export you already have. A CSV or Excel file from SAP, Microsoft Dynamics, Sage, NetSuite, Xero, QuickBooks Online or similar. TrueDue maps the columns automatically. No integration project needed.
2. Reminders go out from your own mailbox, in your name, over several reminder stages after the due date. Customers answer you, not a no-reply address. There is no automated final notice: the last stage is an internal task, and a person on your team decides the next step.
3. TrueDue reads every reply. It recognises promises to pay, disputes, questions, already-paid claims, bounces and out-of-office replies. A clear promise to pay pauses the affected reminders.
4. Exceptions go to your team. Disputes, unclear matches and missing data arrive with the original message and the reason. TrueDue does not decide disputes; your team does.

You choose how much runs on its own:

• Review mode: you approve every email.
• Autopilot for routine cases.
• Autopilot within your own rules.

Fifteen checks run before every send.

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