so are you saying your resident state does not allow a credit against its taxes for taxes paid to another state for income earned there?
With respect to nondiscrimination, the court held that the tax discriminated against interstate commerce because it denied residents a credit on income taxes paid to other States and so taxed income earned interstate at a rate higher than income earned intrastate. The court thus concluded that Maryland’s tax scheme was unconstitutional insofar as it denied the Wynnes a credit against the “county” tax for income taxes they paid to other States.
Maryland personal income has two parts a state income tax and a "county" income tax SCOTUS decided that both taxes are state income taxes. For income earned in other states, Maryland allowed residents a credit against the state tax portion but not the county tax portion. What SCOTUS ruled is that since the county tax was a state income tax the credit also had to be allowed against the county tax portion.
I would point out that if the resident state doesn't tax a certain form of income it does not have to allow a credit for taxes paid to a nonresident state on the income it doesn't tax. Also permissible is to allow a credit no higher than the taxes that are imposed by the resident state on the nonresident state income.
so non-resident state taxes the income without credit and your resident state allows a credit. for the credit to be computed correctly in Turbotax you have to do the nonresident state first.
