Currently the tax laws in the united states for doing business over the internet are practically nonexistant. every year state and federal governments try to pass laws requiring the collection of sales tax from internet businesses. the only one so far that has stuck is for businesses which have brick and morter locations in a state, those businesses are requred to collect tax from customers from their own state who purchase goods from them but not from other states. California is one that rabidly enforces that law.