https://www.nerdwallet.com/taxes/learn/massachusetts-state-tax-rates
Massachusetts State Tax: Rates, Who Pays in 2026 - NerdWallet
Massachusetts has a flat tax rate of 5%. An additional 4% tax is levied on income over $1,083,150, making the highest tax rate in the state 9%.
who pays inmassachusetts statetax ratesnerdwallet
https://fosdem.org/2026/schedule/event/L3BK7S-free-as-in-burned-out/
FOSDEM 2026 - Free as in Burned Out: Who Really Pays for Open Source?