Overdue Invoice Email Templates UK: 5 Professional Templates That Get You Paid

You've done the work. You've sent the invoice. The due date has passed. Now what?

If you're a freelancer, contractor, or small business owner in the UK, you've been here before. The client goes quiet. You don't want to seem aggressive, but you also need to pay your own bills. You stare at a blank email wondering exactly what to say.

The right words matter. A well-written chase email recovers more money, faster, with less damage to the relationship. A badly written one gets ignored or escalates unnecessarily.

Below are 5 proven email templates for every stage of the collection process — from gentle first nudge to formal Letter Before Action. Each is tailored to UK law and references your statutory rights under the Late Payment of Commercial Debts (Interest) Act 1998.

Before You Send: Know What You're Legally Owed

Before writing any chase email, calculate the statutory interest and compensation on your overdue invoice. Under UK law, you're entitled to:

You don't need a special clause in your contract — these rights apply automatically to every B2B transaction.

Use our free calculator to work out exactly what you're owed in 10 seconds

Template 1: The Friendly Reminder (Day 1–3 Overdue)

Send this as soon as the invoice is overdue. Assume it's an oversight — most of the time, it is.

Subject: Quick reminder — Invoice [NUMBER] overdue

Hi [CLIENT NAME],

Hope you're well. Just a quick note to let you know that invoice [NUMBER] for £[AMOUNT] was due on [DATE] and is now [X] days overdue.

I'm sure this is just an oversight. Could you arrange payment at your earliest convenience?

If you've already sent payment, please disregard this — and thank you!

Best regards,
[YOUR NAME]

Why it works: Friendly, brief, no accusations. Gives the client an easy out ("just an oversight"). Most overdue invoices are paid after this single email.

Template 2: The Firm Follow-Up (7–14 Days Overdue)

If the friendly reminder gets no response, it's time to be more direct. This template introduces the concept of statutory rights without threatening legal action.

Subject: Overdue payment — Invoice [NUMBER] — Action required

Dear [CLIENT NAME],

I'm writing regarding invoice [NUMBER] for £[AMOUNT], which was due on [DATE] and remains unpaid after [X] days.

Under the Late Payment of Commercial Debts (Interest) Act 1998, I am entitled to charge statutory interest of 11.75% per annum plus fixed compensation of £[40/70/100]. I would prefer to resolve this without involving these charges.

Please arrange payment of the original £[AMOUNT] within 7 days of this email.

If there is a dispute or issue with the invoice, please let me know immediately so we can resolve it.

Regards,
[YOUR NAME]

Why it works: Mentions the law by name — this alone prompts many clients to pay. Offers a 7-day window. Opens the door for disputes (important: you want to know if there's a genuine issue).

Template 3: The Final Warning (14–21 Days Overdue)

This is the last informal step. Make the total amount clear, including interest and compensation.

Subject: URGENT — Final notice before formal recovery — Invoice [NUMBER]

Dear [CLIENT NAME],

Despite my previous correspondence, invoice [NUMBER] for £[AMOUNT] due on [DATE] remains unpaid.

The total now owed, including statutory interest and compensation under the Late Payment of Commercial Debts (Interest) Act 1998, is £[TOTAL].

This is a final request for payment before I begin formal recovery proceedings. If payment is not received within 7 days, I will issue a formal Letter Before Action as required by the Pre-Action Protocol for Debt Claims.

Please treat this as a matter of urgency.

Regards,
[YOUR NAME]

Why it works: The word "URGENT" in the subject line gets attention. Mentioning "Letter Before Action" and "Pre-Action Protocol" signals you know the legal process. The total including interest shows the cost of continuing to ignore you.

Template 4: Letter Before Action (21+ Days Overdue)

This is a formal legal document. Under the Pre-Action Protocol for Debt Claims, you must send a Letter Before Action and allow 30 days for response before filing a court claim. This is not optional — courts expect you to follow this protocol.

LETTER BEFORE ACTION
Sent pursuant to the Pre-Action Protocol for Debt Claims

Date: [DATE]

Dear [CLIENT NAME],

RE: Outstanding debt of £[TOTAL] — Invoice [NUMBER]

I am writing to give you formal notice that unless payment of the sum of £[TOTAL] is received within 30 days from the date of this letter, I intend to issue court proceedings against [CLIENT COMPANY NAME] to recover the debt, without further notice.

The debt is comprised of:

Original invoice: £[AMOUNT]
Statutory interest (11.75% p.a., [X] days): £[INTEREST]
Fixed compensation: £[COMPENSATION]
Total: £[TOTAL]

Interest continues to accrue at a rate of £[DAILY RATE] per day.

This claim arises from [BRIEF DESCRIPTION OF WORK/GOODS] provided pursuant to [CONTRACT/AGREEMENT], for which payment was due on [DUE DATE].

If you dispute this debt, you must respond within 30 days of this letter setting out the reasons for the dispute, in accordance with the Pre-Action Protocol for Debt Claims.

If you fail to respond, or if payment is not received, I will issue a claim through the County Court without further notice. A County Court Judgment (CCJ) will be recorded against [CLIENT COMPANY NAME] for a period of 6 years and will affect the company's credit rating.

I also reserve the right to claim the court fees, further accrued interest, and reasonable costs of recovery.

Yours faithfully,
[YOUR NAME]
[YOUR BUSINESS NAME]
[YOUR ADDRESS]

Why it works: This is the most powerful document in your collection toolkit. The mention of a CCJ (County Court Judgment) appearing on their credit file for 6 years is what gets results. Most debts are paid at this stage.

Template 5: The Payment Acknowledgment (After Payment)

When the client finally pays, send a brief acknowledgment. This maintains the relationship and creates a paper trail.

Subject: Payment received — Invoice [NUMBER] — Thank you

Hi [CLIENT NAME],

Confirming receipt of payment for invoice [NUMBER]. Thank you for settling this.

[If ongoing relationship: I look forward to continuing to work together. To avoid this situation in future, please ensure future invoices are paid within the agreed terms.]

Best regards,
[YOUR NAME]

Tips for Writing Effective Chase Emails

1. Always Put the Invoice Number in the Subject Line

Make it easy for the client (or their accounts team) to find and process your invoice. A subject line with "Invoice INV-2026-042" gets actioned faster than "Payment reminder".

2. Be Professional, Not Emotional

It's tempting to express frustration. Don't. Every email you send could end up in front of a judge if the case goes to court. Keep every communication factual, professional, and dated.

3. Keep Records of Everything

Save every email, note every phone call with dates and what was discussed. If you go to court, the judge will want to see that you followed a reasonable process.

4. Escalate Gradually

Don't jump straight to the Letter Before Action. The gradual escalation from friendly to formal gives the client every opportunity to pay and demonstrates to a court that you were reasonable.

5. Know When It's B2B vs B2C

The Late Payment of Commercial Debts Act only applies to business-to-business transactions. If your client is a consumer (not a business), you cannot charge statutory interest unless it was in your contract.

What If They Still Don't Pay?

If 30 days pass after your Letter Before Action with no payment and no dispute, you can file a claim through Money Claim Online (moneyclaim.gov.uk). For debts under £10,000, your case goes to the Small Claims Track — no solicitor needed.

Court fees range from £35 to £455 depending on the amount, and these fees are added to the debt if you win.

Read our full guide: Small Claims Court for Unpaid Invoices UK: Step-by-Step

Stop Writing Chase Emails From Scratch

Every overdue invoice is different — different amounts, different dates, different clients. Our free Late Payment Calculator generates personalised chase emails with your exact figures already filled in: your client's name, the invoice amount, days overdue, statutory interest, and compensation.

Enter your invoice details once. Get the first email free. Or get the full Recovery Pack (all 4 escalating emails + formal Letter Before Action + legal reference sheet) for £9.99 — less than a solicitor charges for a phone call.