My AL state return is rejected with code AL40-050

As many others have experienced, my Alabama state return was rejected with code AL40-050.

Something is wrong with the way TurboTax is filling out the AL returns when users have W-2's from other states. It's calculating something incorrectly, which is causing AL to reject the return.

There's nothing users can "fix" to correct this, though, because TurboTax automatically calculates everything based on the federal return.

I've seen multiple people report this problem, but haven't seen a solution.