Income Taxes in Massachusetts
Massachusetts's income tax is genuinely simple for most residents -- a flat 5% rate -- but a real, additional 4% 'millionaires tax' surtax above $1,107,750 of taxable income produces a genuine 9% combined effective top rate, and a separate, currently undecided 2026 ballot initiative to cut the flat rate to 4% is a live policy story this record treats honestly.
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Learn moreA simple flat 5% rate for most residents
Massachusetts levies a flat 5% tax on most taxable income -- a single rate applying the same way to every filer regardless of income level, a real, moderate rate among the states built in this project. Certain short-term capital gains are taxed at a separate, higher 8.5% rate rather than the standard 5%.
The real 'millionaires tax': a 4% surtax above $1,107,750
Since a 2022 ballot measure (Question 1, the 'Fair Share Amendment'), Massachusetts taxable income above $1,107,750 (the 2026 threshold, indexed annually for inflation) carries a real, additional 4% surtax, producing a genuine combined effective top marginal rate of 9% on income above that threshold. This is a real, more progressive structure layered on top of an otherwise-flat base rate -- relevant to high earners specifically, not most movers' day-to-day tax bill.
A real, currently undecided 2026 ballot initiative could cut the flat rate to 4%
A separate, real, and as-of-this-pass UNDECIDED 2026 ballot initiative would cut Massachusetts's flat state income tax rate from 5% to 4%. This record discloses it as a live, pending policy story rather than a settled fact -- the 5% rate remains Massachusetts's current, in-effect rate as of this research pass (August 2026). Confirm the current rate directly if researching after a 2026 election result on this specific initiative.
This is not the retirement-income story -- that's a different calculation
Massachusetts's flat income tax structure applies to wage income the same way regardless of age. Retirement-income tax treatment is a genuinely separate topic -- see the retiring topic for how Social Security, pensions, and 401(k)/IRA distributions are actually taxed in Massachusetts.
Key takeaways
- Massachusetts's state income tax is a simple flat 5% for most taxable income.
- A real, additional 4% surtax applies to taxable income above $1,107,750 (2026 threshold), producing a genuine combined 9% effective top rate.
- A separate, currently undecided 2026 ballot initiative would cut the flat base rate itself to 4% -- a live, unresolved policy story as of this research pass.
- Short-term capital gains are taxed at a separate, higher 8.5% rate rather than the standard 5%.
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