Late Payment

Overdue Invoice Letter Templates: From Reminder to Formal Demand

When emails go unanswered, a formal letter carries real weight. Here are four ready-to-use templates — from friendly nudge to Letter Before Action — plus when to use each.

When to Send a Letter vs an Email

StageMethodWhy
0–30 days overdueEmailFast, trackable, easy to automate
30+ days overdueFormal letterPhysical letters are harder to ignore, signals escalation
60+ days / before legalRegistered letterCreates legal proof of notice — required before UK small claims
Physical letter = harder to ignore.A printed letter on your letterhead carries psychological weight that an email simply doesn't.

4 Overdue Invoice Letter Templates

Template 1: Friendly Reminder Letter (7 Days Overdue)

Warm tone — assumes the invoice slipped through the cracks.

[Your Name] [Your Address] [Date] [Client Name] [Client Address] Re: Invoice #[NUMBER] — Payment Due Dear [Client Name], I hope this letter finds you well. I'm writing regarding invoice #[NUMBER] for [AMOUNT], dated [INVOICE DATE], which was due on [DUE DATE]. I understand this may have been overlooked, and I'm happy to help resolve any queries. Please arrange payment at your earliest convenience using the details below. Bank: [Bank Name] Account Name: [Your Name] Account Number: [XXXXXXXX] Sort Code / IBAN: [XXXXXXXXX] Reference: Invoice #[NUMBER] If you have already sent payment, please disregard this letter. Yours sincerely, [Your Name] [Your Company]

Template 2: Second Notice Letter (14 Days Overdue)

More direct — mentions late fees and requests response.

[Your Name] [Your Address] [Date] [Client Name] [Client Address] Re: SECOND NOTICE — Invoice #[NUMBER] — [AMOUNT] Overdue Dear [Client Name], This is a second notice regarding invoice #[NUMBER] for [AMOUNT], which was due on [DUE DATE] and is now [X] days overdue. I have not received payment or a response to my previous correspondence. Please note that under our agreed payment terms, a late payment fee of [X]% per annum is now accruing on the outstanding balance. I request that payment of [AMOUNT] be made within 7 days of the date of this letter. If there is a dispute or query, please contact me immediately. Payment details: Bank: [Bank Name] · Account: [XXXXXXXX] · Ref: Invoice #[NUMBER] Yours sincerely, [Your Name]

Template 3: Final Notice Letter (30 Days Overdue)

Formal language — sets a hard deadline before next steps.

[Your Name] [Your Address] [Date] [Client Name] [Client Address] FINAL NOTICE — Invoice #[NUMBER] — [AMOUNT] OVERDUE Dear [Client Name], Despite my previous correspondence, invoice #[NUMBER] for [AMOUNT] dated [INVOICE DATE] remains unpaid. This amount is now [X] days overdue. TAKE NOTICE that unless payment of [AMOUNT] (plus accrued late payment interest) is received within 7 days of the date of this letter, I will have no option but to take further action to recover the debt, which may include pursuing the matter through the courts. Such action may result in additional costs being awarded against you. To avoid this, please make payment immediately or contact me urgently to discuss a payment arrangement. Yours sincerely, [Your Name]

Template 4: Letter Before Action / Letter Before Claim (60+ Days)

Legal language — required in UK before small claims. Mentions court proceedings.

[Your Name] [Your Address] [Date] [Client Name] [Client Address] LETTER BEFORE ACTION / LETTER BEFORE CLAIM Dear [Client Name], I write as a final notice before commencing legal proceedings to recover the sum owed to me. Amount owed: [AMOUNT] Invoice number: #[NUMBER] Invoice date: [DATE] Due date: [DUE DATE] Days overdue: [X] days Despite repeated requests for payment, this amount remains outstanding. I hereby give you notice that unless the above sum is paid in full within 14 days of the date of this letter, I intend to issue proceedings against you in the County Court without further notice. Court proceedings may result in a judgment being entered against you, which may affect your credit rating and may be enforced by warrant of execution. Interest under the Late Payment of Commercial Debts (Interest) Act 1998 continues to accrue at 8% above the Bank of England base rate. If you wish to dispute this debt, notify me in writing within 14 days, stating the full grounds of your dispute. Yours faithfully, [Your Name]

⚠️ This template is for informational purposes. Consult a solicitor for complex matters.

Legal Requirements for a Demand Letter

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Include the invoice number and original invoice date

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State the exact amount due including any accrued interest

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Set a clear payment deadline

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Mention late payment interest if applicable

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State what action you will take if not paid

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UK: 'Letter Before Claim' is required by Practice Direction before filing in small claims court

Automating the First 30 Days with Chaser

The good news: the first 30 days of chasing — the email phase — can be fully automated. Chaser sends a 4-stage escalating sequence automatically:

Day 3

Friendly reminder

Day 7

Second notice

Day 14

Firm follow-up

Day 30

Final demand

Physical letters are still manual — but with Chaser handling emails, you rarely need them.

Stop Writing Chasing Emails Manually

Chaser sends payment reminders automatically — so you only write a formal letter when it's actually necessary.

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Frequently Asked Questions

When should I send a formal letter for an overdue invoice?

Send a formal letter after 30 days overdue when emails have gone unanswered. After 60 days, send a Letter Before Action before considering legal proceedings.

What is a Letter Before Action for an overdue invoice?

A Letter Before Action (LBA) is a formal legal notice that you intend to take court proceedings if payment is not received within a specified timeframe. In the UK, a Letter Before Claim is required before filing in small claims court.

What must be included in a formal overdue invoice letter?

Invoice number and date, amount due, original due date, days overdue, late payment interest accruing, a clear payment deadline, your payment details, and statement of next steps if not paid.

Should I send a registered letter for an overdue invoice?

Yes, for 60+ day overdue invoices or any Letter Before Action. Registered/recorded post creates legal proof that the letter was received, which is important if you proceed to court.

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