How to Follow Up on an Unpaid Invoice (Scripts + Email Templates)

The Follow-Up Mindset Shift

Most people hate chasing invoices because it feels confrontational. But here's the reframe: you did the work, you delivered the value, and you're asking to be paid what was agreed. That's not confrontational — it's professional.

The key to comfortable follow-ups is a system. When following up is systematic and consistent rather than reactive and personal, it stops feeling awkward and starts feeling like maintenance.

The Golden Rule

Follow up on every overdue invoice, every time, on schedule. Clients who know you follow up reliably pay on time. Clients who've learned you let things slide will let them slide.

Consistency is more important than the exact words you use.

Pre-Due Date: The Friendly Reminder (3 Days Before)

Subject: Upcoming invoice — INV-[number] due [date]

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Hi [Name],

Just a quick heads-up that Invoice #[number] for [amount] is due on [date].

I've attached a copy for easy reference. Please let me know if you have any questions.

Thanks,

[Your name]

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Why it works: This isn't asking for anything — it's a service. Many clients appreciate the reminder, and it often triggers payment before the due date. It also establishes that you're watching.

Day 1 Overdue: Polite Check-In

Subject: Invoice #[number] — just following up

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Hi [Name],

I wanted to check in on Invoice #[number] for [amount], which was due yesterday.

I've re-attached it in case it's helpful. Please let me know if there's anything I can help with on your end to process this.

Thanks,

[Your name]

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Tone: Assume good faith. It may genuinely have slipped through. Keep it breezy.

Day 7 Overdue: More Direct

Subject: Invoice #[number] now 7 days overdue — [amount]

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Hi [Name],

I'm following up on Invoice #[number] for [amount], which is now one week overdue (due date: [date]).

Could you let me know when we can expect payment, or if there's an issue I can help resolve?

[Your bank details]

Thank you,

[Your name]

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What changed: You've used the word "overdue" and asked for a specific response. The tone is still professional but clearly expects a reply.

Day 14 Overdue: Phone Call

At this point, an email is too easy to ignore. Call.

"Hi [Name], this is [your name] from [business]. I'm following up on Invoice #[number] for [amount] — it's now two weeks overdue. I just wanted to check in and see if there's anything from your end I should know about."

The goal is to get a commitment: "We'll pay it by [specific date]." Write down that date. Follow up if it passes without payment.

Day 21 Overdue: Written Follow-Up After Call

If the call produced a promise but no payment:

Subject: Following up on our call — Invoice #[number]

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Hi [Name],

Following up on our conversation on [date], when you mentioned payment would be made by [date they gave you].

I notice the payment hasn't come through yet. Could you confirm the current status?

I've attached the invoice again for reference.

[Your bank details]

Best,

[Your name]

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Key: Reference the specific promise they made. It creates accountability without being accusatory.

Day 30+ Overdue: Formal Notice

Subject: Formal payment notice — Invoice #[number] — [X] days overdue

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Dear [Name],

This is a formal notice regarding Invoice #[number] for [amount], issued [invoice date] and now [X] days overdue.

As per the payment terms agreed, payment was due on [due date]. Despite previous correspondence, this remains outstanding.

I am requesting full payment within [7] days. If payment is not received by [specific date], I will have no choice but to explore further options for recovery of the outstanding amount, which may include referral to a debt collection agency and/or legal proceedings.

I hope we can resolve this promptly.

Yours sincerely,

[Full name]

[Business name]

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Tone has shifted. This is formal and states consequences clearly. "Further options" is intentionally broad. Send this as both email and physical letter if possible.

When to Escalate Beyond Emails

If a 30-day formal notice produces no response:

Statutory Demand (UK): A formal legal demand that gives the debtor 21 days to pay before insolvency proceedings can begin. Effective for significant amounts.

Small Claims Court: For smaller amounts, a fast and inexpensive process in most countries.

Debt Collection Agency: They typically take 10-25% of recovered amounts. Only worth it for invoices too small to litigate but too large to write off.

Prevention Is Better Than Recovery

The most effective follow-up strategy is the one that prevents problems in the first place:

Credit check new clients for large jobs

Require deposits from new clients

Use Net 14 rather than Net 30 wherever possible

Invoice immediately, every time

Quotation Expert flags overdue invoices automatically and lets you see your full aged receivables at a glance — so nothing falls through the cracks.