What should your invoice include? - A professional header - The first item on your freelance invoice should be your business name, or your full name, in professional (and easy to read) font. The font size should be a little bigger than the rest of the text on the invoice, and possibly even bolded for emphasis.
Next you'll want to include your contact information: your mailing address, phone number, email address, website, etc., right underneath your business name. If you'd like to up the professionalism, create and include your own logo on the right – or left-hand side of the header.