@AmyC gave an excellent description of the workings of Massachusetts IRA contributions, and you seemed to have grasped it perfectly.
I'm from Massachusetts. and I have seen the input screen for this issue in TurboTax for years. If you don't put an entry in it, it will calculate your taxes without an error. You could have made all of your IRA contributions while you lived in another state. Those wouldn't be applicable for this section of the return.
@Dianaboston
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