How to Write a Payment Reminder Email (With 5 Templates)

A payment reminder email should do three things: remind the client what they owe, make it easy to pay, and stay professional enough that you can still work together afterward. Below are five templates you can copy, escalating from a friendly nudge to a firm final notice.

Before you send anything

• Confirm the invoice was delivered (check spam folders if needed).
• Include the invoice number, amount, due date, and how to pay.
• Keep one clear call to action — do not bury the payment details.
• Match the tone to how late the invoice is. Day-of-due is different from three weeks overdue.

If you use automatic invoice reminders, these templates are still useful for one-off messages or for clients who need a personal note after the automated sequence.

Template 1 — Friendly due-date reminder

Subject: Friendly reminder: invoice {NUMBER} due today

Hi {NAME},

Just a quick note that invoice {NUMBER} for {AMOUNT} is due today. You can pay via {PAYMENT DETAILS}.

Thanks — happy to answer any questions.

Best,
{YOUR NAME}

Template 2 — Three days overdue

Subject: Invoice {NUMBER} is a few days overdue

Hi {NAME},

Invoice {NUMBER} for {AMOUNT} was due on {DUE DATE} and is now a few days past due. Please arrange payment using {PAYMENT DETAILS} when you can.

If something is blocking payment on your side, reply and we can sort it out.

Thanks,
{YOUR NAME}

Template 3 — One week overdue

Subject: Second reminder: unpaid invoice {NUMBER}

Hi {NAME},

Following up again on invoice {NUMBER} ({AMOUNT}), now a week past the due date of {DUE DATE}. Payment details: {PAYMENT DETAILS}.

Please confirm when payment will be sent, or let me know if you need a copy of the invoice.

Regards,
{YOUR NAME}

Template 4 — Firm follow-up

Subject: Action needed: overdue invoice {NUMBER}

Hi {NAME},

Invoice {NUMBER} for {AMOUNT} remains unpaid. The original due date was {DUE DATE}. Please settle this invoice by {NEW DATE} using {PAYMENT DETAILS}.

If payment has already been sent, reply with the confirmation so I can mark the invoice paid.

Thank you,
{YOUR NAME}

Template 5 — Final notice before escalation

Subject: Final notice: invoice {NUMBER}

Hi {NAME},

This is a final reminder regarding invoice {NUMBER} for {AMOUNT}, due {DUE DATE} and still unpaid. Please pay by {FINAL DATE} via {PAYMENT DETAILS}.

If I do not receive payment or a written plan by that date, I will need to pause further work and consider next steps to collect the balance.

I would rather resolve this directly. Please reply today.

{YOUR NAME}

What to avoid

• All-caps subject lines or threats you will not follow through on.
• Long stories about your cash flow — keep the ask clear.
• Multiple payment options buried in a paragraph. Put details on their own lines.

For a longer escalation path after reminders fail, read what to do when a client won't pay. To stop rewriting these emails by hand, try Duebird — reminders on the due date, 3 days later, and 7 days later.