Massachusetts Income Tax 2026: Flat 5% Rate, Millionaire Surtax, and Free Calculator
Massachusetts keeps things simpler than most states: one flat rate, no brackets to climb. But the “millionaire surtax” added in 2023 means high earners face a second layer — and short-term capital gains get their own higher rate. Here is exactly how the Massachusetts income tax works for 2026, who pays what, and how to estimate your bill in seconds.
The flat 5% rate: how it works
Massachusetts taxes most income at a flat 5%. Wages, salaries, tips, business income, interest, dividends, rental income, and long-term capital gains all face the same 5% rate. There are no brackets — earning more never pushes you into a higher rate the way federal brackets do.
The math is straightforward:
- Start with your Massachusetts gross income.
- Subtract exemptions and deductions (more on those below) to get taxable income.
- Multiply by 5%.
A single filer with $80,000 of wages and the $4,400 personal exemption owes 5% of $75,600 = $3,780 (before any credits). Try the free tool: /tools/massachusetts-income-tax-calculator/ to run your own numbers instantly.
The 4% millionaire surtax (9% combined above the threshold)
Since 2023, Massachusetts adds a 4% surtax on the portion of taxable income above $1,107,750 — the 2026 inflation-adjusted threshold (it was $1 million originally and rises with inflation each year). Income above that line faces 5% + 4% = 9% combined.
Key details:
- It applies to the excess only. Earn $1,200,000 and the surtax hits just the $92,250 above the threshold — about $3,690 extra.
- It is per taxpayer. Married couples filing jointly do not get a doubled threshold the way some states allow; each spouse’s income is measured against the threshold under the state’s rules.
- It covers all income types, including the normally 5%-rated long-term gains and the 8.5%-rated short-term gains — the surtax stacks on top.
- Estimated payments matter. If a bonus, stock sale, or business windfall pushes you over the threshold, you may owe quarterly estimated tax to avoid underpayment penalties.
Capital gains: 5% vs. 8.5%
Massachusetts splits capital gains by holding period:
- Long-term gains (assets held more than one year): taxed at the flat 5%.
- Short-term gains (held one year or less): taxed at 8.5%.
That 3.5-point gap is one of the biggest single-year holding incentives in any state’s tax code — holding an asset just past the one-year mark can cut the state tax on the gain nearly in half. (The federal distinction matters too, but that is a separate calculation.)
Collectibles and certain other gains follow the same long/short split. Day traders and crypto flippers: virtually all of your gains land in the 8.5% bucket.
Exemptions and deductions that lower your bill
Before the 5% rate applies, Massachusetts lets you subtract:
- Personal exemption: $4,400 for single filers, $8,800 for married filing jointly, $6,800 for head of household.
- Dependent exemptions: $1,000 per dependent.
- Additional exemptions: $700 each for taxpayers 65 or older and for blindness.
- Limited deductions: Massachusetts is stingy with deductions compared to the federal return — but it does allow items like the student loan interest deduction (up to federal limits), certain commuter and EZ-Pass deductions for eligible commuters, and contributions to the state’s 529 plan (up to $1,000 single / $2,000 joint).
Massachusetts does not allow a standard deduction or itemized deductions the way the federal return does. Do not assume your federal deductions carry over — most do not.
What is NOT taxed
- Social Security benefits are fully exempt from Massachusetts income tax.
- Most government pensions (Massachusetts state and municipal) are exempt.
- Unemployment compensation is taxable at the federal level but Massachusetts has periodically excluded it — check the current year’s rules.
- Income below the “no-tax status” thresholds ($8,000 single, with higher limits for joint filers and heads of household, plus $1,000 per dependent) owes zero tax.
2026 filing essentials
- Filing deadline: April 15, 2027 for tax year 2026 (Massachusetts follows the federal deadline).
- Filing threshold: you must file if your gross income exceeds $8,000 (single) — lower than many people expect.
- Estimated payments: due April 15, June 15, September 15, and January 15, same cadence as federal. You generally must prepay at least 80% of your eventual liability to avoid penalties — Massachusetts is stricter than the federal 90% figure people remember.
- Free filing: Massachusetts offers free e-filing for qualifying residents through its MassTaxConnect portal and the federal Free File program.
A quick worked example
Single filer, 2026, $95,000 in wages, no other income:
- Gross income: $95,000
- Minus personal exemption: −$4,400 → taxable income $90,600
- Tax at 5%: $4,530
- Surtax: income is below $1,107,750 → $0
Effective state rate: about 4.77%. Now add a $1.3 million stock sale held 14 months: the gain faces 5% ($65,000) plus the 4% surtax on the $192,250 above the threshold ($7,690) — the surtax is real money at the top end.
Massachusetts rewards simplicity: one rate, a short list of exemptions, and a surtax that only touches very high incomes. Run your own scenario through the calculator, and if you are anywhere near the surtax threshold, talk to a tax professional before year-end — timing a large gain into January versus December can save thousands.
Frequently asked questions
What is the Massachusetts income tax rate for 2026? A flat 5% on most income — wages, interest, dividends, and long-term capital gains. There are no tax brackets in Massachusetts; the rate is the same whether you earn $30,000 or $300,000.
What is the Massachusetts millionaire surtax in 2026? An extra 4% on the portion of taxable income above $1,107,750 (the 2026 inflation-adjusted threshold), for a combined 9% on income above that line. It applies per taxpayer, not per household.
How are capital gains taxed in Massachusetts? Long-term capital gains are taxed at the flat 5% rate. Short-term capital gains (assets held one year or less) are taxed at 8.5%.
What is the Massachusetts personal exemption for 2026? $4,400 for single filers ($8,800 for married filing jointly), subtracted from income before the 5% rate applies. Additional exemptions exist for dependents, the elderly, and the blind.
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