Minnesota and/or Colorado will include your total income if you file a joint state tax return, even if you lived in different states. Both states will give you credit for tax paid to the other state. A joint tax return does not allow you to remove any out of state income because every state taxes residents on income earned everywhere. By filing a joint state, you are considered a “resident,” with includible out of state income.
Minnesota and Colorado require you to use the same filing state as on your federal return. You can file married in both states and claim offsetting tax credits since each of you is a resident of a different state. Or you can file separately for both state and federal.
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