Overdue Invoice Reminder Email Template UK

An overdue invoice reminder email can help UK businesses, freelancers, and service providers follow up on unpaid invoices in a clear and professional way. Late payments are a common problem, especially for small businesses that rely on regular cash flow to pay suppliers, staff, taxes, and operating costs.

A good reminder email should be polite, specific, and easy for the client to act on. It should include the invoice number, amount due, original due date, payment details, and a clear request for payment. If the invoice remains unpaid, you may also need to mention late payment interest or further follow-up steps.

Below are practical overdue invoice reminder email templates you can adapt for your own business.

Why sending an overdue invoice reminder matters

Many late invoices are caused by simple admin delays rather than intentional non-payment. The client may have missed the invoice, sent it to the wrong department, or forgotten the due date. A polite reminder gives them a chance to pay quickly without damaging the business relationship.

However, if you wait too long before following up, the overdue invoice can become harder to collect. Sending reminders at regular stages helps you keep a clear paper trail and shows that you are managing payment terms professionally.

For small businesses, this is especially important. You can read more about the impact of unpaid invoices in our guide on Late Payment Interest for Small Businesses in the UK.

What to include in an overdue invoice reminder email

A clear overdue invoice reminder email should usually include:

• Your business name
• Client name or company name
• Invoice number
• Invoice date
• Original payment due date
• Amount outstanding
• Payment instructions
• A polite request for payment
• A deadline for response or payment
• Optional note about late payment interest if appropriate

The goal is to make it easy for the client to understand what is overdue and how to pay.

Template 1: Polite first overdue invoice reminder

Subject: Payment reminder for invoice [Invoice Number]

Hi [Client Name],

I hope you are well.

This is a polite reminder that invoice [Invoice Number] for [Amount] was due for payment on [Due Date]. According to our records, the invoice is currently still outstanding.

Could you please confirm when payment will be made? I have included the invoice details below for reference:

Invoice number: [Invoice Number]
Invoice date: [Invoice Date]
Amount due: [Amount]
Due date: [Due Date]

If payment has already been made, please ignore this message or send over the payment confirmation.

Kind regards,
[Your Name]
[Your Business Name]

Template 2: Follow-up reminder after no response

Subject: Follow-up on overdue invoice [Invoice Number]

Hi [Client Name],

I am following up on my previous message regarding invoice [Invoice Number], which was due on [Due Date].

The outstanding balance is [Amount]. Please could you arrange payment as soon as possible, or let me know if there is any issue that needs to be resolved before payment can be processed.

For convenience, the payment details are:

Bank name: [Bank Name]
Account name: [Account Name]
Sort code: [Sort Code]
Account number: [Account Number]
Reference: [Invoice Number]

Please confirm once payment has been arranged.

Kind regards,
[Your Name]
[Your Business Name]

Template 3: Firmer overdue invoice reminder

Subject: Urgent: overdue invoice [Invoice Number]

Hi [Client Name],

I am writing again regarding invoice [Invoice Number], which remains unpaid.

The invoice was due on [Due Date], and the outstanding amount is [Amount]. Please arrange payment by [New Deadline Date] or contact me immediately if there is a reason payment has not yet been made.

If the invoice remains unpaid, we may need to consider further action in line with our payment terms and applicable late payment rules.

I would appreciate your prompt attention to this matter.

Kind regards,
[Your Name]
[Your Business Name]

Template 4: Reminder mentioning late payment interest

Subject: Overdue invoice [Invoice Number] and late payment interest

Hi [Client Name],

I am writing about invoice [Invoice Number], which was due for payment on [Due Date] and remains outstanding.

The current unpaid amount is [Amount]. As the invoice is overdue, late payment interest may apply in accordance with our payment terms and applicable UK late payment rules.

Please arrange payment by [New Deadline Date]. If you believe there is an issue with the invoice, please let me know as soon as possible so we can resolve it.

You can estimate possible interest using our UK Late Payment Interest Calculator.

Kind regards,
[Your Name]
[Your Business Name]

When can you mention late payment interest?

In the UK, businesses may be able to charge interest on late commercial payments. For business-to-business debts, statutory interest is commonly calculated as the Bank of England base rate plus 8%, unless the contract sets out a different valid interest rate.

Before adding interest, you should check:

• Your contract or payment terms
• Whether the debt is a business-to-business commercial debt
• The invoice due date
• The number of days overdue
• The applicable interest rate

If you want to understand the calculation method, read our UK Late Payment Interest Formula Explained guide.

Example wording for late payment interest

If you want to keep the tone professional, you can use wording like this:

“Please note that if payment remains outstanding, we may apply late payment interest in line with our payment terms and applicable UK late payment legislation.”

This wording is firm but still polite. It avoids sounding aggressive while making your position clear.

For freelancers, the situation may depend on the client, contract, and type of work. You can read more in our guide: Can Freelancers Charge Interest on Late Invoices in the UK?

Best practices before sending a reminder

Before sending an overdue invoice reminder email, check that:

• The invoice was sent to the correct person
• The invoice number and amount are correct
• The due date has definitely passed
• Your payment details are correct
• There are no unresolved disputes about the work
• You have kept a copy of previous emails

This helps avoid confusion and makes your reminder more effective.

How often should you send invoice reminders?

A common reminder schedule is:

• A polite reminder shortly after the due date
• A follow-up reminder after 7 days
• A firmer reminder after 14 days
• A final notice after 30 days or more

The exact timing depends on your business, client relationship, and payment terms. Some businesses also send a reminder before the invoice becomes overdue, especially for larger invoices.

Keep the tone professional

Even if the late payment is frustrating, it is usually best to keep your email calm and professional. Avoid emotional language, threats, or long explanations. A clear and factual message is more likely to produce a payment or useful response.

Your aim is to make the next step obvious: pay the invoice, confirm a payment date, or explain the issue.

Final thoughts

An overdue invoice reminder email is a simple but important tool for managing unpaid invoices. By using clear wording, including the right invoice details, and following up consistently, you can improve your chances of getting paid without damaging client relationships.

If the invoice remains unpaid, you may need to consider late payment interest or further recovery steps. For quick estimates, you can use our UK Late Payment Interest Calculator to work out possible interest based on the invoice amount, overdue days, and interest rate.