Actually what MA is doing is grossing up your income computing a tax and then crediting you for the MA source income only. So it taxes you at the higher tax rates for all income, then multiplies the tax calculated by MA source/total income. See form 1-NRPY deduction and exemption ratio is the calculation which I beleive is line 14g.
As long as you answered the ADJUSTMENT section part Health Care Coverage , additions and deductions. it should calculate correclty.
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