As a part-year resident, you're generally taxed on all your income while you're a resident of Massachusetts, received from sources inside or outside of Massachusetts.
Non-MA portion is the income received while you were resident of FL.
Unearned income such as interest, dividends, capital gains, social security, and IRA distributions is usually taxable in the state you were a resident of when you received it.
If you know the exact amount of distributions received while you were living in MA, this is the amount that is considered MA source income. If you don't have the exact amount received during the time you were MA resident, divide the amount received by 12 and then multiply the figure by the number of months you lived in MA.
For more information, check: How do I file a part-year state return?
How do I allocate (split) income for a part-year state return?
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