What comes out of a Massachusetts salary
Federal income tax, Social Security (6.2%) and Medicare (1.45%), Massachusetts income tax at a flat 5% (after up to $2,000 of FICA and your M-4 exemptions) and your share of Paid Family & Medical Leave (0.46%). There are no city income taxes, including in Boston.
For a full paycheck with your W-4, M-4 and benefits, use the Massachusetts paycheck calculator.