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.
Invoice No.(Invoice Number): To stay organized and make the tracking easier for your tax season, we strongly suggest providing unique and sequential invoice number for every invoice you send.