Only one W2 should be entered in TurboTax for the same employer unless there really is two W2s where the combined amount is your total wage. Based on your information in the question you only made $70k for this employer.
In TurboTax enter one W2 but when you get to the State tax area fill in the information for each state as shown in the screenshot attached. (Edit if you have already entered it, delete the second W2.)
This should work out the calculations for you. Click
here for MA rules on credit for taxes paid to another state.
- Since MA requires you to pay tax on all of your income because you are a resident, all $70k should show up on that return.
- CT requires you to pay tax on the income you earn there whether or not you live there so for this state you are a non-resident.
- MA will give your a credit for taxes paid to CT on the same income.
