Unpaid invoice follow-up emails that make the next step clear

The work is finished. The invoice is sent. Then “I’ll check with accounts” becomes the last message in the thread.

Your next email should make it easy to identify the invoice and answer one useful question: when will the payment arrive?

Check these details before you follow up

An unpaid invoice is not always a forgotten invoice. The contact may have changed, a purchase order may be missing, or the payment may already be on its way.

Intuit’s past-due invoice guidance recommends checking invoice details and confirming receipt. Stripe’s invoice-email guide recommends clear, polite messages with the relevant invoice and payment information.

First reminder: ask for a payment date

Here is a fictional example for a $750 project invoice. Replace the details and include the actual payment instructions before sending.

Subject: Payment reminder: invoice 1042 — $750 due
Hi Jamie,
I’m following up on invoice 1042 for the website updates. The $750 balance was due on September 1, and I haven’t received it yet.
I’ve attached the invoice again. Payment details are included on it.
Could you confirm when payment is scheduled? If anything is missing on my side, please let me know.
Thanks,
Alex

If you normally use an invoice link, replace the attachment sentence with that link. Check that the recipient can open it. Do not say “attached” and leave out the file.

Second reminder: make it easy to route

If there is no reply, stay in the same email thread so the context is visible. Ask whether someone else needs to handle the payment.

Subject: Re: Payment reminder: invoice 1042 — $750 due
Hi Jamie,
Checking that you received invoice 1042 and my message below. The $750 balance is still outstanding.
Could you confirm the payment date? If another person handles invoices, please let me know who I should contact or forward this to them.
I’ve included the invoice again for convenience.
Thanks,
Alex

Use your actual records to describe what is outstanding. If the client disputes part of the invoice, address that point directly. Repeating the full balance without acknowledging their question may leave the same issue unresolved.

When a promised payment date is missed

The original due date and the client’s later promise are different facts. Keep both, and refer to the latest confirmed promise in your follow-up.

Subject: Invoice 1042 — checking the September 11 payment
Hi Jamie,
You mentioned that the $750 payment for invoice 1042 was scheduled for September 11. I haven’t received it yet.
Could you confirm whether it was sent? If it has, please share the payment reference so I can check. Otherwise, please confirm a revised payment date.
Thanks,
Alex

A scheduled payment is not a received payment. If the client confirms a transfer, check its status before sending another overdue reminder.

How often should you send an invoice reminder?

Use the agreed terms and your existing conversation to choose the timing. This is an adjustable example, not a rule:

1. Just after the due date: check for payment, then send a short first reminder if the balance remains unpaid.
2. A few business days later: if there is no reply, confirm receipt and ask for the right payment contact.
3. On a new promised date: check whether the payment arrived. Follow up if the promise passes without payment or an explanation.

Avoid adding fees, stopping agreed work or making threats as a default email tactic. Those decisions depend on your agreement and circumstances. These templates are for getting a clear response, not determining contractual rights.

Keep a small follow-up record

You should be able to open one note and know what to do next.

Keep the original invoice in your invoicing system and link to the relevant conversation. Record each payment separately, reduce the balance, and mark the matter settled when it is paid in full.

Remaini is being built for the commitments around the transaction: who said what, what remains open and when to check again. See the planned record and check-in flow.

Questions that come up

What is a good subject line for an unpaid invoice email?

Use something recognizable: “Payment reminder: invoice 1042 — $750 due.” Include the invoice number and an accurate balance. If you are following up in an existing thread, keeping its subject can preserve context.

What if an invoice is only partly paid?

Thank the client for the amount received, state the remaining balance and ask about that balance. Include an updated statement or invoice view if your invoicing tool provides one. Do not ask for the original total again.

What if the client says they never received it?

Confirm the correct address, resend the invoice and payment details, and ask them to acknowledge receipt. Record the response and ask when payment can be scheduled.

Can I use these emails to ask a friend for money back?

A personal loan usually needs a shorter, more familiar message. Use the friend repayment examples and keep the loan amount and payment history clear.