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How to Follow Up on an Unpaid Invoice (Without Being Awkward)

The work is done. The invoice was sent. The due date passed. And now you’re staring at your inbox wondering if you should say something or wait another few days to not seem “desperate.”

You’re not desperate. You did work and you deserve to get paid. Here’s a framework for following up at every stage — with emails you can copy, paste, and send.

The mindset shift

Following up on an invoice isn’t rude. It’s professional. Think about it: your dentist sends payment reminders. Your landlord sends payment reminders. Your SaaS subscriptions auto-charge you. Nobody thinks twice about it.

You’re running a business. Act like it.

Day 1 after the due date — The gentle nudge

Most late payments aren’t malicious. The client forgot, the email got buried, or their accounts payable person is on vacation. Keep it light.

Subject: Quick reminder — Invoice #[NUMBER] was due yesterday Hi [Name], Just a quick note that Invoice #[NUMBER] for $[AMOUNT] was due on [DATE]. I'm sure it just slipped through — no worries at all. I've attached the invoice again for convenience. You can pay via [payment method]. Let me know if you have any questions! [Your name]

Day 7 — The polite follow-up

A week has passed. Still professional, but slightly more direct. You’re making it clear this isn’t a one-off reminder.

Subject: Following up on Invoice #[NUMBER] — now 7 days overdue Hi [Name], Following up on my previous email — Invoice #[NUMBER] for $[AMOUNT] is now a week past due (original due date: [DATE]). Could you let me know the expected payment date? If there's an issue with the invoice itself, happy to sort it out. Payment can be made via [payment method]. Invoice attached. Thanks, [Your name]

Day 14 — The firm reminder

Two weeks overdue. Time to mention your late fee policy (you did include one on the invoice, right? If not, here’s what every invoice needs).

Subject: Invoice #[NUMBER] — 14 days overdue Hi [Name], This is my third follow-up regarding Invoice #[NUMBER] for $[AMOUNT], originally due on [DATE]. As outlined in the invoice terms, a late fee of [X]% per month applies to overdue balances. I'd prefer to resolve this without any additional charges. Could you please confirm when payment will be processed? [Your name]

Day 30 — The formal notice

A month overdue. Drop the casual tone. This is a business communication, not a chat with a friend. Be specific about consequences.

Subject: Overdue payment — Invoice #[NUMBER], 30 days past due [Name], Invoice #[NUMBER] for $[AMOUNT] has been outstanding for 30 days past the original due date of [DATE]. Please process payment within the next 7 business days. If I do not receive payment or a response by [specific date], I will need to consider further action, which may include late fees, suspending ongoing work, or engaging a collections service. I'd much rather resolve this directly. Please reply with a payment date. [Your name]

Beyond 30 days

If you’re past 30 days with no response, your options are:

  • Stop all ongoing work for this client immediately
  • Send a formal demand letter via certified mail
  • Small claims court — most jurisdictions handle claims up to $5,000–$10,000
  • Collections agency — they typically take 25–50% but you get something

How to prevent this in the first place

The best follow-up email is one you never have to send. A few things that dramatically reduce late payments:

A clean, professional invoice sets the tone. Clients take you more seriously when your paperwork looks serious. Our free invoice templates are designed to do exactly that — try the contractor template or designer template.

Create Your Invoice →

Frequently Asked Questions

How long should I wait before following up on an unpaid invoice?

Send a polite reminder 1 day after the due date. Most late payments are simply forgotten, not intentional. Waiting weeks only delays your money and makes the conversation harder.

Can I charge interest on overdue invoices?

In most US states and in the UK/EU, yes — provided you stated the late fee terms on the original invoice. Common rates are 1–1.5% per month. Check your local laws for specifics.

What should I do if a client never pays?

After 60+ days, send a formal demand letter. If the amount justifies it, consider small claims court (usually for amounts under $5,000–$10,000 depending on jurisdiction) or a collections agency.