Yes, this nonresident credit is strictly calculated to remove or credit the tax calculated on the entire year's income which is the first calculation on the Maine (ME) return. The credit for your part year residency has nothing to do with a 'credit for taxes paid to another state on the same income'. Tax calculations on several states start with the federal income and then is adjusted in situations like yours.
It seems the credit should be correct as it stands because it has nothing to do with the DC part year resident return. The key information in your post from the ME instructions is exactly what I am explaining:
- You tax liability is first calculated as if you were a resident of Maine for the entire year. You are then allowed to calculate a nonresident credit on Maine Schedule NR that will reduce your Maine tax by the portion of the tax that is related to the income your earned outside the state while a nonresident.
@khbloomer
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