Massachusetts has a flat personal income tax rate of 5% on most types of income, including wages, salaries, tips, interest, and dividends. Unlike states with graduated brackets that tax higher earnings at progressively higher rates, Massachusetts applies the same 5% rate whether you earn $40,000 or $400,000. However, a surtax on high earners adds a significant layer for those with annual income above $1 million.
The 5% Flat Tax
Nearly all personal income in Massachusetts is taxed at 5%. This covers your wages, self-employment income, interest, dividends, rental income, and long-term capital gains. The flat structure keeps things relatively simple compared to states with multiple brackets. If you earn $75,000 in taxable income, your Massachusetts tax bill before credits and deductions is $3,750.
Short-term capital gains, meaning profits on assets you held for one year or less, are taxed at a higher rate of 8% in some cases. Long-term capital gains on assets held longer than a year fall under the standard 5% rate. If you sell stocks or property, how long you held the asset matters for your Massachusetts tax bill.
The 4% Millionaire’s Surtax
In 2022, Massachusetts voters approved the Fair Share Amendment, which created a 4% surtax on annual income above $1 million. This means income up to $1 million is still taxed at 5%, but every dollar above that threshold is taxed at 9% (the base 5% plus the 4% surtax). Someone earning $1.2 million would pay 5% on the first $1 million and 9% on the remaining $200,000, adding $8,000 in extra tax beyond what the flat rate alone would produce.
The $1 million threshold is indexed to inflation, so it adjusts upward over time based on the Consumer Price Index. This prevents bracket creep from gradually pulling more taxpayers into the surtax as wages rise with inflation.
Personal Exemptions
Massachusetts offers personal exemptions that reduce your taxable income before the 5% rate applies. These aren’t as large as the federal standard deduction, but they still lower your bill. The exemption amounts depend on your filing status:
- Single: $4,400
- Married filing separately: $4,400
- Head of household: $6,800
- Married filing jointly: $8,800
These exemptions are subtracted from your gross income to arrive at the amount Massachusetts actually taxes. A married couple filing jointly with $90,000 in income would subtract $8,800, paying the 5% rate on $81,200. Massachusetts also offers additional exemptions for dependents, taxpayers who are blind, and those age 65 or older.
How Massachusetts Compares
At 5%, Massachusetts sits in the middle of the pack among states that levy an income tax. Several states have no income tax at all, while others impose top rates above 10% on high earners. The flat-rate structure means Massachusetts doesn’t penalize middle-income earners with progressively higher brackets the way some states do, though the millionaire’s surtax does create a two-tier system at the very top.
One thing to keep in mind: Massachusetts does not allow you to itemize deductions the same way you can on your federal return. The state has its own set of deductions and credits, some of which mirror federal provisions and some of which don’t. Contributions to retirement accounts, certain student loan interest, and rent payments (up to a cap) can all reduce your Massachusetts taxable income, but the rules differ from what you see on your federal Form 1040.
Filing and Payment Basics
Massachusetts income tax returns are due on April 15, matching the federal deadline in most years. If you’re a full-year resident, you owe Massachusetts tax on all your income regardless of where it was earned. Part-year residents and nonresidents who earned income in Massachusetts only owe tax on the portion of income connected to the state.
If you’re an employee, your employer withholds Massachusetts income tax from each paycheck based on the 5% rate. Self-employed individuals and those with significant non-wage income are expected to make quarterly estimated payments. The state charges interest and penalties on underpayments, so keeping up with estimated taxes throughout the year matters if you have freelance income, rental income, or large investment gains.