This is a free/name-your-price spreadsheet template for Apple Numbers to help freelancers keeping track of their assignment invoices and clients payments. The template is set in €, which you can easily change in Numbers. It has a 21% VAT column, you can change it to reflect your country's tax percentage, remove or set it to 0% if not applicable The Net earning column helps to give you an idea of your actual earnings. In this template, it is set to a tentative 45%—check with your accountant which percentage best applies to you. The Agent fee is set to zero, you may need to change that too.
Add or remove rows as you see fit. The template covers a full year.