No one thinks that sales tax in the U.S. is a problem unless they are operating in the U.S. But a Supreme Court case last year between Wayfair, the online furniture and home goods company and the state of South Dakota has changed that. It overturned a law on not taxing companies with no physical presence in the taxing state, ushering in an uncharted paradigm for any company selling online.

The impact of the ruling will hit businesses across the board. Historically, companies only had to pay these taxes in states in which they have a physical presence. Now, they will be charged by states into which they sell – i.e. where they make a sale.