How to Use This Calculator
Enter your income, filing status, and any deductions. The calculator computes your Massachusetts state income tax alongside your federal tax, showing exactly how much goes to each and what you take home.
The most useful thing to try? See how Massachusetts's flat 5% (plus 4% surtax on income over $1 million) rate affects different income levels, then test how deductions and retirement contributions change your bottom line.
Here's what each field means:
Annual Income is your total earnings before any taxes. Include wages, freelance income, investment income, and any other sources.
Filing Status determines which deductions and exemptions apply. Massachusetts uses filing statuses similar to the federal system.
Massachusetts Income Tax: What You Need to Know
Massachusetts uses a flat income tax of 5% (plus 4% surtax on income over $1 million) on most taxable income. Unlike states with progressive brackets, everyone pays the same percentage regardless of how much they earn.
Massachusetts has a flat 5% income tax rate on most income, but in 2023, voters approved the "Fair Share Amendment" adding a 4% surtax on annual income exceeding $1 million. This means income above $1 million is effectively taxed at 9%. Massachusetts doesn't use a standard deduction — instead, it offers a personal exemption of $4,400 for single filers ($8,800 for married filing jointly). The state uses its own definition of taxable income that starts with federal gross income. Short-term capital gains are taxed at 8.5%, while long-term gains are taxed at the standard 5%.
A Real Example
Let's say you're a single filer earning $90,000 in Massachusetts. Your approximate Massachusetts state income tax would be around $4,280, for an effective state tax rate of about 4.8%.
That's just the state portion. Federal income tax and FICA taxes are additional.
Deductions and Exemptions
Personal exemption of $4,400 (single) / $8,800 (MFJ). Deductions for rent paid (50% of rent, up to $3,000), commuter expenses, and charitable contributions. Massachusetts does not tax Social Security but does tax most other retirement income.
Local Taxes
No local income taxes in Massachusetts.
Recent Changes
The 4% millionaire surtax took effect in 2023, generating over $1.8 billion in new revenue in its first year. The base 5% rate has been stable for several years.
How to Use This Calculator Strategically
Model a raise or job change. With a flat tax, the math is simpler — every additional dollar is taxed at 5% (plus 4% surtax on income over $1 million). But deductions and credits can still shift your effective rate.
Compare filing statuses. Even with a flat rate, different filing statuses unlock different deduction amounts that can affect your bottom line.
Plan retirement contributions. See how 401(k) or IRA contributions reduce your Massachusetts taxable income and lower your state tax bill.
Evaluate a move. Compare Massachusetts's flat 5% (plus 4% surtax on income over $1 million) rate to other states. Depending on your income level, a flat tax state might save you money — or cost you more — compared to a progressive system.
References
- Massachusetts Department of Revenue. (2025). Personal Income Tax.
This calculator is for educational purposes only and does not constitute tax or financial advice. Tax rates and rules change regularly. Consult a qualified tax professional for guidance specific to your situation.