Sports betting only became legal in the United States in 2018 after the U.S. Supreme Court struck down a 1992 federal ban and ruled that states could individually determine what forms of gambling were legal within their boundaries. This opened the floodgates for various state legislatures to decide whether to allow sports betting. Currently, 40 states and the District of Columbia authorize the practice, and 34 permit online sports betting, according to the American Gaming Association. This has tax impl ...