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One reminder email rarely fits a whole late payment — the message that works three days before the due date would be absurd at thirty days overdue, and the final-notice tone would be a relationship-ending way to open. Below is the full library we recommend (and that Invoicekin Pro sends automatically for the early stages): one template per stage, each copy-paste ready. Replace the brackets, keep the tone of each stage, and send from knowledge — with view tracking you already know whether the invoice was opened.
Stage 1 — Three days before the due date (the friendly heads-up)
Subject: “Quick heads-up: invoice [INV-1042] due Friday”. Body: “Hi [Name], just a friendly note that invoice [INV-1042] for [amount] is due this Friday, [date]. The pay link and a QR code are on the invoice itself. Thanks again for the project — [one genuine line about the work].” Short, early, zero pressure — this single email prevents most lateness outright.
Stage 2 — On the due date
Subject: “Invoice [INV-1042] due today”. Body: “Hi [Name], a quick note that invoice [INV-1042] ([amount]) falls due today. I've re-attached it here for convenience. If you've already sent payment, thank you — please ignore this. Any questions about the invoice, I'm happy to help.” Re-attaching matters: half of all “lost invoice” delays are genuine.
Stage 3 — Three days overdue (gentle)
Subject: “Following up on invoice [INV-1042]”. Body: “Hi [Name], I hope you're well. Invoice [INV-1042] for [amount] was due on [date] and I haven't seen it land yet — it may simply be in a payment run. Could you confirm it's in hand? Happy to resend anything your accounts team needs.” Assume administration, not intent.
Stage 4 — Seven days overdue (clear, asks for a date)
Subject: “Invoice [INV-1042] — now 7 days overdue”. Body: “Hi [Name], following up again on invoice [INV-1042] ([amount], due [date]). Could you let me know the expected payment date? If there's an issue with the invoice itself, tell me today and I'll fix it immediately.” Asking for a date converts a vague delay into a commitment — most invoices resolve at this stage.
Stage 5 — Fourteen days overdue (firm, late fee appears)
Subject: “Second reminder: invoice [INV-1042] + late fee”. Body: “Hi [Name], invoice [INV-1042] is now two weeks overdue. As per our agreed terms, a late fee of [fee] now applies, bringing the balance to [new total] — the free Late Fee Calculator shows the working. Please arrange payment this week, or tell me what is blocking it.” Only send this if the fee was in your original terms — see the late payment fees guide.
Stage 6 — Thirty days overdue (serious)
Subject: “Urgent: invoice [INV-1042] — 30 days overdue”. Body: “Hi [Name], despite previous reminders, invoice [INV-1042] ([amount + fees]) remains unpaid after 30 days. Please treat this as priority. If I don't hear from you by [date], I'll need to pause further work and consider formal recovery options. I'd much rather we resolve it between us — reply to this email and we will.”
Stage 7 — The final notice
Subject: “Final notice: invoice [INV-1042]”. Body: “Hi [Name], this is a final notice for invoice [INV-1042], total outstanding [amount]. If payment is not received by [date], I will escalate this for recovery, which may add costs. If you are experiencing difficulties, contact me before that date and I will consider a payment plan in writing.” Then do what you said — credibility is the asset.
The good-client exception (any stage)
A reliable client with a genuine one-off problem deserves a different email at any stage: “Hi [Name], I can see invoice [INV-1042] is still open — no stress, I know this month has been unusual. Can we agree a date that works for you? I'm happy to waive the late fee if we settle by then.” Goodwill, in writing, with a date — it gets paid and it gets you rehired.
Automate stages 1–3
The friendly stages should never cost you willpower. Invoicekin Pro sends automatic reminders on your chosen schedule (before, on and after the due date), and view tracking tells you the invoice was seen — so your manual energy is saved for the rare invoice that reaches stage 5. Set your reminder days once in Settings and the system chases politely while you work.
Try it free — 15 invoices a month, no card
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FAQs
When should I send the first invoice reminder?
Before the due date — a friendly heads-up three days prior prevents most late payments and never offends anyone.
How many reminders are too many?
A staged sequence of five to seven across 30–45 days is normal professional practice, as long as each is polite, factual and firmer than the last.
Should I mention late fees in a reminder?
Only if the fee was agreed in your terms before the work. Introduce it at the two-week stage, with the calculation shown.
What if the client says they never got the invoice?
Resend it attached to your reply, and use view tracking next time — a Viewed status with a timestamp settles the question kindly and factually.
What should a past due invoice reminder say?
The total, the original due date, how many days overdue the invoice now is, and one clear next step: “Please arrange payment this week, or tell me what is blocking it.” An overdue invoice email works best in stages — gentle at 3 days, clear at 7, firm at 14 with any agreed late fee shown, exactly as the templates above are written.
How do I write an invoice email — and send an invoice through email?
How to write an invoice email in four parts: what the invoice is for, the total and the due date, the invoice itself attached as a PDF (or linked), and one clear way to pay. Every template in this guide doubles as the email body — paste it in, attach the invoice, and send. In Invoicekin, one tap prepares the send message with the total and your payment link already in it.
Can Invoicekin send these automatically?
Yes — automated invoice reminders are part of the Pro BONUS pack: Pro sends the early stages automatically on your schedule. The later stages stay manual on purpose — by then it's a conversation, not a nudge.