I moved to MA from NH mid year after losing my job. I have only collected NH Unemployment since. Is that NH unemployment taxable in MASS? NH has no state tax, so if it is I am regretting it.
Yes, if you changed residence, you will have to file a Part-Year Mass return and report the income you received when you lived in Mass.
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. Massachusetts gross income is income earned from all sources while a Massachusetts resident.
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If you met the NH income threshold (see below) for interest & dividends, you would owe NH tax on the dividends and interest you earned while a resident of NH (a Part-Year resident return). That income would not be taxable by MA, but you would have to allocate the rest of your 2020 intent and dividend income to MA.
There is a threshold for the NH tax on dividends and interest. From the NH tax website: The state only taxes interest and dividends at 5% on residents and fiduciaries whose gross interest and dividends income, from all sources, exceeds $2,400 annually ($4800 for joint filers).