By now, most Americans have filed their state tax returns. While many were fortunate enough to owe income to just a single state, some taxpayers had to grapple with the often-confusing process of filing a return in other states, then claiming the taxes paid to those states as a credit against their home state’s tax liability. While that’s irritating enough, a case that the Supreme Court is currently deciding whether or not to take up would determine if those states are allowed to effectively get away with double taxation.
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