You really need to know what you are selling, where you are selling it, how you are selling it, and in what format you are selling it as sales tax can apply to both goods and services. Hawaii, New Mexico and South Dakota, impose sales tax on all services and more states are expanding the services subject to tax each year. Taxation of digital goods, and “bundled” items add complexity to the issue. Therefore, you need to develop a “tax matrix” which captures every item that can be billed to a customer