I have a similar question regarding Massachusetts and double counting. I worked for one company, but some of the work was done in MA and the rest was in DE.
On my W2 I have two state copies, one for MA and one for DE. The one for MA shows my total earnings as reported on my federal return, and the DE one shows just what I earned in DE.
In TurboTax, these are listed as a single W2 with multiple entries for lines 15-18. When I file my MA return the software is combining the MA and DE totals to a total larger than my entire earnings, and calculating my tax on that number.
It seems that it should be calculating tax on my federal earnings for MA, and then subtracting what I worked in DE.
