Amazon collects sales tax in other states where it has made big investments, or about half of the states according to the company’s website. How much Ohio will receive from Amazon’s collection of the state’s 5.75 percent sales tax is not clear.I mean, it’s the law. If you have a physical presence in the state, then you have to charge sales tax on online purchases, so I think it’s just the way it is,” said Christopher Klopfer from Worthington. “I use (Amazon) quite a bit, so I probably won’t stop.”.