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Having the wording ready before you need it makes follow-up far easier to actually send — there's no blank-page moment where an awkward message gets postponed another day. Adjust the tone to fit your own relationship with the client; these are starting points, not scripts to copy exactly.
Before the due date
Subject: Invoice #[number] — quick check
Hi [name], just confirming invoice #[number] for [amount], due [date], made it through okay and everything looks right on your end. Let me know if you need anything else from me before then.
On the due date, unpaid
Subject: Invoice #[number] — due today
Hi [name], invoice #[number] for [amount] was due today. If it's already on its way, no need to reply — otherwise, let me know if anything's holding it up.
A week past due
Subject: Invoice #[number] — now a week overdue
Hi [name], invoice #[number] for [amount] was due on [date] and I haven't seen payment yet. Could you let me know the status, or if there's anything blocking it on your end?
Two to three weeks past due
Subject: Invoice #[number] — payment now [X] days overdue
Hi [name], invoice #[number] for [amount] is now [X] days past its due date of [date]. Please let me know by [specific date] when I can expect payment. [If applicable: "As noted on the invoice, a late fee of [X]% applies to overdue balances."]
Final notice before escalation
Subject: Invoice #[number] — final notice
Hi [name], I haven't received payment or a response for invoice #[number], now [X] days overdue. If I don't hear back by [specific date], I'll need to [pursue collections / involve a third party / whatever your actual next step is]. I'd rather resolve this directly — please reach out.
A few things that make any of these work better
- Always include the invoice number, amount, and date — a reminder that makes the recipient dig for details gets deprioritized.
- State a specific next date or action, not just "please pay soon" — see setting payment terms for why specificity matters throughout the invoicing process.
- Keep the tone flat and factual, especially in early messages — assume a simple explanation until the pattern says otherwise.
- Don't skip stages. Jumping straight from silence to a final notice reads as disproportionate; the graduated tone is what makes escalation feel earned rather than arbitrary.
These templates work better as a starting draft you adjust for the specific client and situation than as fixed text sent verbatim — the goal is to save you from starting from a blank page, not to remove judgment from the process.