Invoice ToolkitPDF billing tools
Getting paid·Templates 3 min read

How to Write a Payment Reminder Email

Use a calm, specific payment reminder with the invoice number, amount, due date, and next step.

Published and maintained by Invoice Toolkit · Reviewed

An unpaid invoice may be waiting on approval, missing information, or a payment date. A clear reminder sequence keeps the conversation factual while making the next step obvious.

  • —Confirm the invoice before the due date so overdue reminders feel routine, not hostile.
  • —Every reminder should repeat invoice number, amount, due date, and how to pay.
  • —Escalate tone gradually — friendly, polite, firm, then final notice.

What should a payment reminder include?

A useful payment reminder identifies the unpaid invoice, states the amount and due date, and gives one clear next step.

Include the invoice number so the recipient can match the message to their records, and repeat the payment method or reference from the original invoice. Before the due date, keep the note friendly and ask the client to confirm receipt.

After the due date, state the outstanding balance and ask whether an approval or missing detail is holding up payment.

  • Send 5–7 days before due date
  • Confirm receipt of the invoice
  • Restate due date and payment method

Subject line example: Invoice INV-1042 due Friday — quick confirmation

Be specific after the invoice is overdue

Once the due date passes, reference the exact invoice number, original due date, and outstanding balance. Ask whether anything is blocking payment and offer to resend the PDF or update a PO number if needed.

  • Reference exact invoice number and balance
  • State how many days overdue
  • Ask whether AP needs a PO or resend

Hi Jordan — invoice INV-1042 for $2,450 was due on March 15. Could you confirm whether anything is blocking payment? Happy to resend the PDF or update a PO number.

Escalate tone gradually

Move from friendly → polite → firm → final notice over days or weeks, not hours. Mention late fees only if they were agreed in advance. Keep each message professional — the goal is payment, not conflict.

  • Wait several business days between tones
  • Only mention late fees if pre-agreed
  • Keep each message shorter than the last

Friendly → polite → firm → final notice works better than jumping straight to legal language.

Put the workflow into practice

Put what you learned into practice — no signup required. Drafts stay in your browser; optional server-side PDF generation only processes a document to create the file you request.

Requirements vary by country and business type. This guide explains common billing workflows and is not tax, legal, or accounting advice.