Massachusetts tax guide

Massachusetts Tax Filing: Income Classes, Rent Deduction, Surtax

Updated October 19, 2026

Massachusetts sorts income into three classes and taxes ordinary income at a flat rate. Social Security and many pensions are deducted. A rent deduction helps renters. Income above a high threshold faces an added tax. The return is due the fifteenth day of the fourth month after the tax year ends.

Three classes of income, not one pile

Massachusetts law splits gross income into three parts, and each part has its own rules.

Part A covers interest, dividends and capital gain income, with some savings interest and long-term gains left out of this part.
Part B covers all other Massachusetts gross income that is not in Part A or Part C. Wages and business income land here.
Part C covers gains from selling or swapping capital assets held more than a year.

The statute sets a flat rate for Part B ordinary income. Rates for the other parts are in the same section of law. On top of that, taxable income above a high set amount gets an additional tax. People call it the millionaires tax. If you sold a business, a home or a large investment, read the current Department of Revenue instructions on that surtax before you file.

What Massachusetts takes out of income

Massachusetts starts from federal gross income and then subtracts some items. The statute lists these:

Social Security benefits that are in your federal gross income.
Income from a contributory annuity, pension, endowment or retirement fund of certain government entities.
Retirement pay for a retired member of the Uniformed Services.
Income from IRAs and qualified retirement plans, until the total deducted equals the amounts Massachusetts already taxed.
Disaster relief payments, certain education loan discharge amounts and Holocaust victim reparations.

The last bullet in the retirement list needs care. It works as a running total across years, not a simple yes or no. If you take IRA money, keep records of what you paid in and when.

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Deductions you will not find on the federal return

Massachusetts has its own deductions and exemptions. The statute names these:

Rent. If you rent your principal residence in Massachusetts, you can deduct part of the rent, up to a cap.
Commuting. Tolls and fares for Massachusetts Bay Transit Authority travel, within limits that depend on filing status.
Education. Interest on education debt, certain tuition payments, and money put into a prepaid tuition or college savings program.
Medical and dental. A deduction follows the federal rule if you itemize on the federal return.
Exemptions. A personal exemption by filing status, an exemption for each dependent, and extra exemptions if you are blind or age 65 or older.

Amounts adjust over time, so the Department's current instructions have the figures. Renters often miss the rent deduction. Keep your lease and proof of payment.

Residency, who files, and when

Massachusetts defines a resident two ways. You are a resident if you are domiciled in the state. You are also a resident if you are not domiciled here but keep a permanent place to live in the state and spend more than a set count of days there, which is about half the year. Days spent on active military duty do not count as days in the state. A nonresident is anyone who is not a resident.

The return is due on or before the fifteenth day of the fourth month after the tax year ends, which is April 15 for calendar-year filers. The filing duty depends on how much Massachusetts income you have. Married couples who file a joint federal return must generally file jointly in Massachusetts, with limited exceptions for a spouse with very little income or a nonresident spouse.

The tax deadlines page lists current dates, and the IRS says the due date moves to the next business day when it falls on a weekend or legal holiday.

Extensions have a payment condition

Under state law, the commissioner may grant a reasonable extension for good cause. You must file a tentative return and pay the amount of tax you reasonably estimate you owe by the payment due date.

The condition has teeth. If you do not pay a set share of the tax by the original date, the extension is void and the return is treated as late, with penalties. The IRS also says an extension to file is not an extension to pay. Our extension guide explains why paying close to what you owe matters, whichever state you file in.

Leaving Massachusetts, or keeping a foothold

Domicile is the key test. Moving your home out of state during the year changes what counts as Massachusetts income going forward, but it does not erase income you earned as a resident. Keep the move date, your lease or sale papers and final pay statements.

The day-count rule is the trap for people who move but keep a condo, a family house or a rented room. Keep a day log if you do. Our moving to Florida guide explains how to show your new home.

Paperwork and mistakes that slow a Massachusetts return

Putting everything in one class. Wages, interest and long-term gains are treated differently.
Missing the rent deduction. Renters forget it because it has no federal twin.
Ignoring the surtax. A one-time sale can push taxable income over the threshold.
Skipping records on IRA income. The deduction tracks what Massachusetts already taxed.
Filing separately by habit. A joint federal return usually means a joint Massachusetts return.
Paying too little with an extension. It can void the extension.

If you have side income, see our estimated tax guide. The IRS says self-employed people generally must make federal estimated payments when they expect to owe tax.

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FAQ

Does Massachusetts tax Social Security?

No. The statute lists Social Security benefits included in federal gross income as a deduction. Certain government pensions and Uniformed Services retirement pay are deductions too.

What are Part A, Part B and Part C income?

Part A is interest, dividends and capital gain income, with some items left out. Part B is other income, such as wages. Part C is gain from capital assets held more than a year.

Can renters deduct rent in Massachusetts?

Yes. The statute lets you deduct part of the rent on your principal Massachusetts residence, up to a cap. The Department's instructions give the current figures.

When is the Massachusetts return due?

State law makes it due on or before the fifteenth day of the fourth month after the tax year ends, which is April 15 for calendar-year filers.

How does a Massachusetts extension work?

You file a tentative return and pay your reasonably estimated tax by the due date. If you do not pay a set share of the tax by then, the extension is void and the return counts as late.

Nearby state guides

New York

Sources

General information, not tax advice for your specific situation. Rules can change, so check the official sources below. Zero Fuss Taxes is a PTIN-holding tax preparation firm. We are not a CPA firm, enrolled agents or attorneys.

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Zero Fuss Taxes is a PTIN-holding tax preparation firm. We are not a CPA firm, enrolled agents or attorneys.