I get a credit on my resident state tax for taxes paid to the nonresident state where I worked. The credit is the lesser of the actual tax paid to the nonresident state and the tax that would be due to the resident state based on the amount of earnings in the nonresident state. The nonresident tax rate is more than twice the resident tax rate.
I realized that I made a mistake in my last two nonresident returns that caused me to overpay taxes. I can easily amend those nonresident returns to recoup the money, but am wondering if I would then have to file amended resident returns. The thing is that changing the amount of taxes paid to the nonresident state will not change the amount due to the resident state as the corrected nonresident tax paid is still greater than what the resident tax would be on the amount earned.
So am I obligated to file an amended resident state return if there would be no change in the amount of tax due?