@hinfsynz
The tax software will figure that credit amount for you.
1) When you prepare the CT non-resident tax return, your CT tax liability is determined......i.e. the tax assessed before considering any withholding.
2) then when you go thru the MA resident tax return interview, you get to a section that asks about taking a credit for taxes paid to another state...you go in there, and teh CT tax liability should already be in there. The credit may not be exactly the CT tax liability, MA only allows a credit for up-to what MA would-have charged on the same income, so it depends on the relative tax rates for the two states....but TTX will do the computation.
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But you need to get the Federal section entirely filled in, every scrap, and the W-2 fully correct first.
Also, check the extra copies of your W-2, sometimes each state's specific amounts of wages/withholding are on the extra copies while the main form only shows the total for the states.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
