Learn how to write an effective invoice email. Streamline your invoicing process and ensure timely payments with these best practices.Want to know how to write an email with an invoice attached? Read on for our top tips, as well as a sample invoice email you can use for your customers. In this article, you'll find five email templates that you can use to inform clients about the completion of a project. You'll learn essential tips to write the best invoice emails and provide 6 invoice business email templates and a template for you to use. Use this invoice email template to write and send invoices that are straightforward and easy to understand, making it easier for you to get paid on time. Email 1: "Dear Client, I attach an invoice for services rendered. Our sample invoice template is good for virtually any business that needs to send customers an invoice for services rendered or products sold. Invoice emails should be clear, concise, and easy for the client to understand.