Past due invoice email templates: friendly reminder, past due notice, final notice

Before you send: check the invoice and the payment.

A reminder only works if the invoice is really due and really unpaid. Before writing, open the invoice and your bank or payment account. Reminding a client about an invoice they paid yesterday costs more goodwill than a week of patience.

• Confirm the invoice number, issue date, due date and payment terms as written on the invoice.
• Check for payments that arrived in the last few days, including partial payments and checks in transit.
• Write to the person who pays, usually accounts payable, and copy the person who hired you.
• Settle any open question about the work first. A disputed invoice needs a conversation, not a reminder.
• Attach the invoice as a PDF and repeat the payment instructions so nobody has to search.

Stage 1: the friendly reminder, day 1 to 3 past due.

The friendly reminder is a service message sent one to three days after the due date. It assumes the invoice was overlooked, not refused. It restates the facts, attaches the invoice and asks for a payment date. The tone is the one you use with a client you want to keep.

Hi [First name],

I hope all is well. This is a quick note that invoice [number], dated [issue date] for $[amount], was due on [due date] and I have not seen the payment yet.

It may simply have slipped through. Could you let me know when it is scheduled, or send it over in the next few days? The invoice is attached again with the payment details.

If you have already paid, please disregard this message. If anything on the invoice needs a correction, just reply and I will sort it out.

Thanks,
[Your name]
[Your company]
[Phone]

Stage 2: the past due notice, day 10 to 15.

The past due notice goes out around day 10 to 15 if the reminder brought no reply and no payment. It sets a specific date, names the consequence your terms allow and asks for a reply either way. Mention a late fee only if your contract or the accepted invoice terms state one. A fee that was never agreed cannot be added after the fact, and claiming one weakens a later demand letter. If no fee was agreed, delete that paragraph and keep the deadline.

Hi [First name],

Following my reminder on [date of reminder], invoice [number] for $[amount], due on [due date], is now [days] days past due.

Please arrange payment by [deadline, for example 7 days from today]. Payment details are on the attached invoice.

As stated in our agreement [or: on the invoice], overdue balances accrue a late fee of [rate, for example 1.5% per month] from the due date. The fee as of today is $[fee]; it will be added to the balance if payment is not received by the date above.

If payment has been sent in the meantime, or if there is a problem with the invoice or the work, please reply so we can resolve it. Otherwise I will take the invoice as accepted.

Regards,
[Your name]
[Your company]
[Phone]

Stage 3: the final notice, day 30.

The final notice is the last message before you hand the matter to someone else. Send it around day 30. It sets a last date, totals what is owed and names the next step: a demand letter followed by a collection agency, or a claim in small claims court. State only what you will actually do. If you have no intention of filing, do not write that you will.

Hi [First name],

Despite my messages on [date] and [date], invoice [number] for $[amount], due on [due date], remains unpaid. [If a fee was agreed: With the late fee stated in our agreement, the balance is now $[total].]

This is my final request for payment. Please pay the full balance by [final deadline, for example 7 to 10 days from today].

If payment is not received by that date, I will refer the account to a collection agency [or: file a claim in small claims court] without further notice, and I will ask for any costs the law allows.

If you dispute the invoice, tell me now, in writing, so we can resolve it before that step.

Regards,
[Your name]
[Your company]
[Phone]

What cadence works?

A realistic cadence for a freelancer or small firm: friendly reminder on day 1 to 3, past due notice on day 10 to 15 with a 7-day deadline, final notice on day 30 with a 7 to 10 day deadline, then a demand letter by certified mail. Send on weekdays during business hours; a reminder that lands on Saturday night is read on Monday with the rest of the backlog. Between stages, one phone call to accounts payable often reveals the real cause: a missing purchase order number, a W-9 they never received, or an approver on vacation. The calendar is a management habit, not a legal requirement. No US law requires three reminders before you escalate.

Mistakes that delay payment.

• Sending a reminder without the invoice number, the amount and a copy attached, which forces the client to go looking.
• Writing “at your earliest convenience” instead of a date.
• Threatening a late fee that is not in the contract, or a lawsuit you will not file. Never threaten what you won’t do: an idle threat teaches the client that your deadlines are optional.
• Switching to a hostile tone on day 2 and then going quiet for a month.
• Reminding the wrong person, or a generic inbox, with no follow-up.
• Letting automatic reminders keep going after a partial payment or a dispute.
• Waiting 60 days before the first reminder. The older an invoice gets, the less likely it is paid in full.

A note on the law. The federal Fair Debt Collection Practices Act regulates third-party debt collectors, and it covers consumer debts, meaning obligations incurred primarily for personal, family or household purposes (15 U.S.C. §1692a). It does not apply to you when you collect your own business-to-business invoices in your own name. That is not a license to be aggressive: state collection and harassment laws, and the ordinary rules against threats, misrepresentation and defamation, apply to anyone collecting a debt. Keep every message factual, written and dated.

Send all three stages automatically with Dunlio.

Dunlio ships these three stages as editable templates: friendly reminder, past due notice and final notice. Enter your invoices or import a CSV, adjust the wording to your voice, and let the tool send each stage on the right day after the due date, on weekdays, in your time zone. You can also release each message by hand. Every message shows whether it was delivered.

When you mark an invoice paid, paused or disputed, no further stage goes out. Dunlio can write the invoice too, as a PDF with sales tax, or remind invoices you import from another tool; it does not collect payments. It is free during early access, then Solo $9 or Team $19 per month with no contract. For late fees, payment terms and the demand letter, see our other guides.