Online retailers are required to tax people that live in the same state as that the retailer is based out of, I believe. It's based on the way that the states handle sales tax. Technically, all of us are supposed to calculate the tax that we should be paying if we had bought it in state and then send that tax money to the state we live in, because the state we live in cannot collect the tax from companies in other states. But really, who among us are actually going to do that?