Free templates are generally available in a variety of formats you probably already have on your computer, such as HTML, Microsoft Word, Microsoft Excel, or PDF. Some free templates include time-saving features, like self-calculation for easy figuring, generic logos or options to add your own logo, automatic date stamping, and easy drop down menus for selecting items or services to customize your invoice.
Lastly, you will need to consider the production of your template. Depending on your industry you need to pick the best invoice to suit your needs. For example, you may use an invoice template that you customize electronically and print from the convenience of your office before submitting to your client.