Massachusetts income tax goes up to 5% at the top bracket. Calculate your combined federal + state effective tax rate for 2026. Formula shown, sources cited — no account required.
Massachusetts keeps its income tax structure simple: a flat 5% rate applies to most wages, salaries, and business income for nearly all residents. There is no graduated bracket system — every dollar of ordinary income is taxed at the same rate regardless of how much you earn. The one exception is the 2023 Millionaires Tax, which adds a 4% surtax on income over $1 million, pushing the effective top rate to 9%. For the median earner at $104,828, the state tax bill works out to roughly $5,241 before any credits. On top of that, federal marginal rates apply, so understanding the combined burden matters for planning. Massachusetts does allow deductions for rental payments and certain commuter expenses, which can trim the taxable base. Capital gains above one year are taxed at the standard 5% rate, but short-term gains on assets held under a year are taxed at 8.5% — worth knowing for investors. Use the tax bracket calculator to see your combined state and federal picture.
Massachusetts Tax Brackets Explained (2026)
Massachusetts has a state income tax with a top marginal rate of 5%. On top of federal rates (10%–37%), residents can face a combined marginal rate exceeding 35% at higher income levels. However, your effective rate is always lower than the marginal rate because only income above each threshold is taxed at that bracket's rate.
The median household in Massachusetts earns $104,828/year. At that income (single filer), the federal effective rate is approximately 12–14%, bringing total income tax (federal + state) to roughly 15–18%.
How Marginal vs. Effective Rate Works
The marginal rate is the rate on your last dollar of income — it does not apply to all income. The effective rate is your total tax divided by total income. For example, someone earning $100,000 in Massachusetts has a 22% federal marginal rate but an effective federal rate of roughly 15%, because the first $44,725 (2024) is taxed at 10% and 12%, not 22%.