How to Write a Payment Reminder Email: 5 Examples

A payment reminder email is a short message asking a client to pay an invoice that is due soon or overdue. Most late invoices are missed, not refused: the email was buried, the invoice went to the wrong person, or accounts payable is waiting for a purchase order number. The job of the email is to remove whichever of those is in the way.

This article is about the words: subject lines, the structure of the body, and five examples you can adapt. For when to send each one, see automatic payment reminders. For tone with different clients, see payment reminder etiquette.

What makes a payment reminder email work?

It answers four questions in the first few lines: which invoice, how much, when it was due, and how to pay. Anything that delays those answers (an apology, small talk, a vague subject line) makes the email easier to postpone.

Part	What to write	Example
Subject line	Invoice number, amount or status, and a date	Invoice INV-0117: $1,850 due Wednesday, November 18
Opening line	The fact, in one sentence	Invoice INV-0117 for $1,850 was due on November 18.
Facts block	Remaining balance, issue date, due date, PO number if the client uses them	Balance: $1,850. Issued October 19. PO 88-2041.
Pay action	One link or one set of bank details	Pay online: [link]
Exit for problems	Invite corrections	If anything on the invoice is wrong, reply and I will fix it today.
Next step	Only in later reminders: what happens and when	I need payment by December 16.

Write the remaining balance, not the original total, if the client has paid part of the invoice. Attach the invoice PDF or link to it in the first reminders, so "I can't find it" is never the reason for a delay.

How should you write the subject line?

Lead with the invoice number, because accounts payable teams search their inbox by it, and add either the amount or the status. Subjects such as "Quick question" or "Following up" look like every other email and say nothing in a notification preview.

Stage	Subject line
Before the due date	Invoice INV-0117 for $1,850 is due Wednesday, November 18
On the due date	Due today: Invoice INV-0117 ($1,850)
A few days overdue	Invoice INV-0117 is 5 days overdue: anything I can fix?
To accounts payable	Invoice INV-0117, PO 88-2041: is it in your next payment run?
Final notice	Final notice: Invoice INV-0117, $1,850, payment due by December 16

Three rules cover most cases:

Put the number first. On a phone, the end of a long subject is often cut off; the invoice number should survive.
Escalate the status, not the punctuation. "Overdue" and "final notice" are clear. Capitals, exclamation marks and "URGENT" read as spam and invite a defensive reply.
Keep the same invoice number in every subject. Many email apps group messages into threads by subject, so the client sees the full history in one place.

Five reminder emails you can adapt

The examples below follow one invoice: INV-0117 for $1,850, issued Monday, October 19, 2026 on net 30 terms, so due Wednesday, November 18. Replace the bracketed details with your own.

1. Before the due date

Send a few days before the due date, so the invoice makes the client's next payment run.

Subject: Invoice INV-0117 for $1,850 is due Wednesday, November 18

Hi [Name],

A quick heads-up that invoice INV-0117 for $1,850 is due on
Wednesday, November 18. I've attached it again for convenience.

You can pay online here: [payment link]
Or by bank transfer to: [account details]

If it needs to go to someone else in your team, let me know
who and I'll send it straight over.

Thanks,
[Your name]

Why it works: it is informational, not a chase, and it asks the one question that most often delays payment, which is whether the invoice is with the right person.

2. On the due date

Subject: Due today: Invoice INV-0117 ($1,850)

Hi [Name],

Invoice INV-0117 for $1,850 is due today, November 18.

Pay online: [payment link]
Reference to use for a bank transfer: INV-0117

If it's already been sent, thank you, and please ignore this.

[Your name]

Why it works: three facts and one action. It gives the reference to quote on a transfer, which saves you matching an unlabelled payment later.

3. A few days overdue

Assume an oversight, and ask a question the client can answer in one line.

Subject: Invoice INV-0117 is 5 days overdue: anything I can fix?

Hi [Name],

Invoice INV-0117 for $1,850 was due on November 18 and I
haven't seen payment yet. The invoice is attached.

Is there anything holding it up, such as a missing PO number,
a wrong billing address or a question about the work? If so,
reply and I'll sort it out today.

If it's on its way, could you let me know the expected date?

Pay online: [payment link]

Thanks,
[Your name]

Why it works: the question turns a reminder the client can ignore into one they can answer. A reply such as "it's in the December 1 run" is often all you need.

4. To accounts payable

When your contact has approved the invoice but payment is stuck in their finance team, write to accounts payable with everything they need to match it.

Subject: Invoice INV-0117, PO 88-2041: is it in your next payment run?

Hello,

I'm following up on invoice INV-0117 from [Your business] to
[Client company], approved by [Contact name].

Invoice: INV-0117
PO number: 88-2041
Amount: $1,850.00
Issued: October 19, 2026
Due: November 18, 2026 (12 days overdue)

The invoice is attached. Could you confirm it is registered
and tell me which payment run it's scheduled for? If anything
is missing, such as supplier setup forms or tax details, I'll
send it the same day.

Kind regards,
[Your name]
[Your business, phone]

Why it works: AP clerks match on supplier name, invoice number, PO and amount. Giving all four in a block, and offering supplier setup paperwork, removes the usual reasons an invoice sits unmatched. Copy your contact so they can vouch for the work.

5. Final notice with a deadline

Send this only after earlier reminders, and only name steps you will actually take.

Subject: Final notice: Invoice INV-0117, $1,850, payment due by December 16

Hi [Name],

Invoice INV-0117 for $1,850 was due on November 18 and is now
21 days overdue. I've written on November 23 and November 30
without a payment or a date.

Please pay the full balance by Wednesday, December 16:
[payment link] or bank transfer to [account details].

If I haven't received payment or heard from you by then,
I will [pause further work on the project / start the
small-claims process / pass the debt to a collection agency].

[Only if your contract or invoice terms included it:]
As set out in our agreement, late payment interest of [rate]
applies from November 18.

If something about this invoice is disputed, please tell me
now so we can resolve it.

[Your name]

Why it works: it lists the history, sets one dated deadline and states a consequence as a fact. Keep it unemotional; this email may be read by a third party later. Never add a late fee that was not in your contract or invoice terms. See late fee laws by state for US rules and overdue invoice interest for how interest is calculated.

Before and after: fixing a weak reminder

Here is a reminder that is polite but hard to act on:

Subject: Just checking in!

Hi! Sorry to bother you, just wondering if you had a chance
to look at my invoice? No worries if not, I know you're busy!!
Thanks so much!

What is missing: the invoice number, the amount, the due date, a way to pay and a question the client must answer. The apology also tells the client the payment is optional. The rewrite:

Subject: Invoice INV-0117: $1,850 was due November 18

Hi Sam,

Invoice INV-0117 for $1,850 was due on November 18. The
invoice is attached and you can pay here: [payment link].

Could you let me know when it's scheduled? If anything on
it needs changing, reply and I'll fix it today.

Thanks,
Priya

It is about the same length, but every line does a job.

Short replies for common situations

The client paid part of the invoice. "Thank you for the $1,000 received on November 20. The remaining balance on INV-0117 is $850, due by [date]. Pay online: [link]." Record the payment first, so your next reminder shows the right figure.

The client says they already paid. "Thanks for letting me know. I can't see it yet; could you send the payment date and the transfer reference or remittance advice, so I can match it?" Do not send another reminder until you have checked.

The client disputes part of the invoice. Stop the reminders, reply to the substance, and if you agree a correction, issue a credit note or corrected invoice rather than editing the old one. See handling disputed invoices.

The client asks for more time. Agree a specific date or a payment plan in writing, then remind them of that date, not the original one.

When a reminder email is the wrong tool

After two unanswered reminders to the same person. A third email to the same inbox rarely works. Phone them, or write to accounts payable or a more senior contact.
When the invoice is in dispute. Resolve the dispute first; reminders during a disagreement damage the relationship and do not speed payment.
Once you are ready to take formal action. A letter before action or a demand letter has formal requirements in many places; the late payment guide covers escalation.
For clients who pay by portal only. Large companies that require invoices in a supplier portal often ignore emails about invoices that are not in the portal. Check it is uploaded and approved there first.

Sending reminders with InvoiceQuickly

On the Pro plan ($9/month), InvoiceQuickly can send automatic reminders on a schedule you set before and after the due date, up to a maximum number per invoice. The wording is fixed and short:

Subject: "Payment due soon: invoice INV-0117 from [your business]" or "Payment overdue: invoice INV-0117 from [your business]".
Body: the due date and the remaining balance after recorded payments, with one button: "Pay securely" if the invoice has a Stripe or PayPal payment link, otherwise "View invoice" in the client's portal. Replies go to your email address.

You cannot edit that text, and the reminder does not attach the PDF. Use the automatic reminders for routine nudges (examples 1 to 3 do the same job), and write the accounts payable email and the final notice yourself. If you have issued a credit note against an invoice, check the balance before relying on an automatic reminder, as it is based on the invoice total minus recorded payments. On the Free plan, InvoiceQuickly does not send emails, so copy these examples into your own email. The free payment reminder templates tool has three more versions (gentle, firm and final) to copy.

Frequently asked questions

How do I write a payment reminder email?

Start the subject with the invoice number and add the amount or status. In the body, state the invoice number, remaining balance and due date in the first sentence, add one way to pay, invite the client to flag any problem, and for later reminders state a dated next step. Attach or link the invoice.

How do I politely ask for an overdue payment?

State the facts without apologising and assume an oversight: "Invoice INV-0117 for $1,850 was due on November 18 and I haven't seen payment yet. Is anything holding it up?" A direct question is polite and gets a reply more often than a vague check-in.

What is a good subject line for a payment reminder?

One that names the invoice and the status, such as "Invoice INV-0117 is 5 days overdue: anything I can fix?" or "Final notice: Invoice INV-0117, $1,850, payment due by December 16". Avoid "Just checking in", capitals and exclamation marks.

How do I write a friendly payment reminder?

Keep it short, thank the client, give the facts and a payment link, and offer help: "If it needs to go to someone else in your team, let me know who." Friendly does not mean vague; the invoice number, amount and due date still belong in the first lines.

How do I reply when a client confirms payment?

Thank them and confirm the amount and invoice: "Thank you, I've received $1,850 for invoice INV-0117 and marked it as paid." If you issue receipts, attach one. A short confirmation also closes the thread so no automatic reminder follows.

Should I attach the invoice to every reminder?

Attach it, or link to it, in the first two or three reminders so a lost email is never the reason for a delay. In a final notice, keep the invoice attached but focus the email on the deadline and the next step.

How many reminder emails should I send?

Usually three to five: one before the due date, one on or just after it, one or two follow-ups about a week apart, then a final notice with a deadline. After that, switch to a phone call or formal steps. The automatic payment reminders guide covers timing in detail.

Last reviewed: October 27, 2026. This is general guidance on business correspondence, not legal advice; check the rules on late fees, interest and debt collection where you and your client are based.

More on getting paid: invoice follow-up strategy, how to handle unpaid invoices and the InvoiceQuickly blog.