How to Follow Up on an Unpaid Invoice

8 min read
How to Follow Up on an Unpaid Invoice

Your invoice is overdue. Here are professional email templates and a timeline for following up — from gentle reminders to firm final notices.

Your invoice is overdue. The client hasn't paid. A structured follow-up process — with clear timing and professional templates — usually gets you paid without damaging the relationship.

Timeline and Templates

Day 1 (Due Date Reminder)

Send a brief reminder on the due date. Example: "Hi, invoice #INV-2026-001 is due today. Please let me know if you need anything else."

Day 7 (Friendly Follow-Up)

Hi [Client Name],

I wanted to follow up on invoice #INV-2026-001 for [amount], which was due on [date].

If payment has already been sent, please disregard. If there are any issues or questions, I am happy to help.

Thanks,
[Your Name]

Day 14 (Firm Reminder)

Hi [Client Name],

Invoice #INV-2026-001 for [amount] remains unpaid. It was due on [date].

Please remit payment at your earliest convenience. If there is a problem, let me know so we can resolve it.

Thanks,
[Your Name]

Day 30 (Final Notice)

Hi [Client Name],

This is a final reminder regarding invoice #INV-2026-001 for [amount], due on [date].

If payment is not received by [date], I will need to consider further steps, including late fees as per our terms.

I hope we can resolve this. Please contact me if there are any concerns.

[Your Name]

Day 45+ (Escalation)

If still unpaid, consider a formal demand letter, late fees (if in your terms), or legal action for significant amounts.

Tips for Effective Follow-Up

  • Stay professional. Firm is fine; aggressive rarely helps. Assume oversight first.
  • Reference the invoice number. Always include it. Makes it easy for the client to find and process.
  • Make it easy to pay. Re-attach the invoice or include payment details if helpful.
  • Offer payment plans for large amounts. If the client is struggling, a plan may get you paid faster than a standoff.

Tools like InvoiceBlitz help you track which invoices are paid and which are overdue, so you know when to send each follow-up.

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