How to Write a Payment Reminder Email

Start friendly before the due date

A week before the due date, send a short note confirming the invoice was received and restating the due date. Include the invoice number, total, and a payment link or bank details.

This reduces surprises and often prevents the invoice from becoming overdue.

• 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.

Include payment links or bank details

Make the next step obvious. Repeat how to pay, whether that is a transfer reference, portal link, or check address. Clients pay faster when they do not have to search for instructions.

• Repeat bank details or payment link
• Use the same reference text as the invoice
• Put instructions above the email signature

If the client pays by transfer, missing reference text is one of the top reasons finance teams delay matching.

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.