@Bobandroxie - Right, you may not be able to efile if you apportion. You will probably have to mail it in. This trick is just to get TurboTax to bring up the apportionment details, it will not show up on your return anywhere. It's a failure of TurboTax to not ask this question by default. According to the MA Dept. of Revenue, you are allowed to apportion, you just need the proof to back it up and a letter from your employer is proof enough according to the MA DoR.
