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.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. Invoice emails should be clear, concise, and easy for the client to understand. Apply for a New Business Tax Certificate online or at the Business Tax Office. Refundable business registration fee plus special fees. Discover how to craft effective invoice email templates that ensure quicker payments and keep clients uptodate with their account status.