How to Follow Up on Unpaid Invoices (Email Templates)

The awkward truth about chasing payments

Following up on unpaid invoices feels uncomfortable. Most freelancers would rather lose money than send an awkward email. But here's the thing — clients aren't usually trying to avoid paying you. They're busy. They forgot. The invoice got buried.

Your follow-up isn't pushy. It's helpful.

The follow-up timeline

Before the due date (3 days before)

Subject: Friendly reminder — Invoice #[NUMBER] due [DATE]

Hi [Name],

Just a quick heads-up that invoice #[NUMBER] for [AMOUNT] is due on [DATE]. Let me know if you need anything from my side.

Thanks!

[Your name]

On the due date

Subject: Invoice #[NUMBER] is due today

Hi [Name],

This is a reminder that invoice #[NUMBER] for [AMOUNT] is due today. You can find the invoice attached or in your email from [ORIGINAL DATE].

Please let me know once payment has been sent.

Best,

[Your name]

7 days overdue

Subject: Following up — Invoice #[NUMBER] (7 days overdue)

Hi [Name],

I wanted to follow up on invoice #[NUMBER] for [AMOUNT], which was due on [DATE]. I understand things get busy — just want to make sure this hasn't slipped through the cracks.

Could you let me know when I can expect payment?

Thanks,

[Your name]

14 days overdue

Subject: Invoice #[NUMBER] — 14 days past due

Hi [Name],

Invoice #[NUMBER] for [AMOUNT] is now 14 days past due. I'd appreciate it if we could resolve this soon.

As noted in the original invoice, a [X]% late fee may apply to overdue balances. I'd prefer to avoid that — let me know if there's an issue with the payment.

Best regards,

[Your name]

Tips for effective follow-ups

• Be direct but not aggressive — assume good intent
• Reference the invoice number and amount — make it easy to act
• Offer to re-send the invoice — sometimes it genuinely got lost
• Set expectations upfront — include payment terms on every invoice
• Automate when possible — tools like Zenaris can detect overdue invoices and suggest follow-ups before you even think about it

The real cost of not following up

A single missed follow-up might cost you $500. Across 10 clients over a year, that adds up to thousands in lost revenue — not because clients won't pay, but because no one reminded them.

The best solution? A system that catches these gaps automatically, so you never have to feel awkward about asking for money you earned.