How to write a professional invoice letter

An invoice letter is a short, formal message sent along with an invoice. It explains the reason for the invoice and provides key details such as the amount, due date and contact information. A well-written invoice letter improves communication, reduces confusion and encourages timely payment.

On this page, you’ll learn how to write an invoice letter that is clear, professional and suitable for any business context. We’ll also share an example of invoice letter content that you can adapt to your own needs.

Table of contents:

What is an invoice letter?

An invoice letter—also known as a business invoice letter—is a covering message that accompanies an invoice, usually by email or as an attachment. It gives context to the invoice and lets the customer know what to expect and what action is needed. It’s an essential part of clear financial communication.

Why use an invoice letter?

A clear invoice letter:

• Confirms payment details (amount, method, and deadline)
• Sets a professional tone
• Helps your invoice stand out in a busy inbox
• Encourages fast and correct payment
• Leaves a positive impression on your client

Step-by-step: how to write an invoice letter

Follow these six steps to create a professional invoice letter:

Step 1: Start with a template

Use a reusable template with your company branding and tone of voice. This helps maintain consistency and saves time.

Step 2: Add your business details

Include the following at the top:

• Your name
• Company name
• Address
• Date
• Contact information

Step 3: Add the recipient’s information

Make sure the invoice is addressed to the correct contact person. Add:

• Full name
• Job title
• Company name
• Address

Step 4: Use a professional greeting

Example:

Dear Mr [Last name],
I hope this message finds you well.

Step 5: Clearly explain the invoice

State the purpose of the invoice and key details:

Please find attached invoice 2023-015 for web development services provided in August. The total amount due is £ 1,250 excluding VAT.

Kindly transfer the amount within 14 days. If payment has already been made, please disregard this message.

Step 6: End with a courteous closing

Thank you for your prompt attention.

Kind regards,
[Your Name]
[Your Job Title]
Attachment: Invoice 2023-015

Example of invoice letter

Here’s a basic example of invoice letter:

How Payt helps with invoice letters

Many accounting packages provide standard templates for invoices and reminders. Useful, but they often lack the flexibility and personal touch required to deliver real results. Payt takes things a step further.

Our software integrates smoothly with your existing accounting system, ensuring that all invoices are followed up automatically. At the same time, you never lose oversight or control: you decide the pace and the tone of communication.

With Payt, you benefit from:

• Send clear, timely letters and reminders automatically
• Personalise communication at scale
• Monitor invoice status in real-time
• Save time and reduce admin

Want to see how it works? Book a demo or download our brochure and experience the benefits for your business.

Frequently asked questions