Why is it important to have a resale license in the surplus and salvage business?
However, that's not always the case if you are selling goods to someone who will be "reselling" the goods to a third party. For example, if you're a shoe manufacturer, you may be selling your shoes to outlets, which in turn will be selling them to customers. As long as you can verify that the outlet company has a resale number, the obligation to collect sales tax from the customer then falls on the outlet.
Sales taxes can get very tricky, so make sure you consult with an accountant who knows this area well.