How to write a professional invoice letter

An invoice letter is a short, business-oriented message that accompanies an invoice. It clearly outlines what the invoice is about and what action you expect from the recipient. A well-written invoice letter helps prevent misunderstandings and leads to faster payments.

On this page, we’ll show you how to write an invoice letter step by step. You’ll find best practices, formatting tips, and an example of an invoice letter that you can use for your own business communications.

Table of contents:

What is an invoice letter?

An invoice letter is a formal but friendly cover note you send with an invoice—either by email or in print. It makes the invoice more personal and transparent and reinforces the key payment details. A clear and professional invoice letter format builds trust and reduces the chance of delays.

Why include an invoice letter with your invoice?

• Reinforces payment terms and method
• Highlights the reason for the invoice
• It supports a professional and customer-focused approach
• Encourages timely payment through clarity and tone

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

Use the six steps below to create a professional invoice letter that fits your business:

Step 1: Create a reusable template

Start with a blank document or email template. Include your logo, company name, and tone of voice. A consistent layout adds professionalism and saves time.

Step 2: Add your company information

Top left corner:

• Your name
• Company name
• Street address
• Zip code + City
• Date

Step 3: Enter the recipient’s details

Clearly address the invoice to the correct contact. Include:

• Full name
• Job title
• Company name
• Address

Step 4: Start with a friendly greeting

Use a personal salutation and a brief introductory line:

Dear Mr. Johnson,
I hope this message finds you well.

Step 5: State the purpose clearly

Go straight to the point. Let the recipient know what the invoice is for and what is expected.

Please find attached invoice 2023-015 for website maintenance in August. Payment is due within 14 days. A 5% discount applies if paid on time.

For any questions, contact [email address or phone number].

Step 6: Close professionally

Thank you in advance,

[Signature]
[Your name]

Attachment: Invoice 2023-015

Example of invoice letter

Need inspiration? Here’s a clear and professional example of an invoice letter:

How Payt helps with invoice follow-up

Many accounting programs provide standard templates for invoices and reminders. Convenient, but they often lack the flexibility and personal touch needed to achieve real results. Payt takes it a step further.

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

With Payt, you benefit from:

• Invoices are paid 30–50% faster
• You save up to 80% of manual follow-up time
• Reminders are sent automatically in the right tone
• Customers can respond directly via the invoice portal

Want to experience it yourself? Schedule a demo or download the brochure to get started.

Frequently asked questions