Massachusetts Tax Residency Rules 2026: 183-Day Rule & 4% Surtax

Who needs to read this

Massachusetts taxes residents on their worldwide income, and since the 2023 millionaire's surtax took effect, the stakes of being (or staying) a Massachusetts resident have jumped for high earners. Read on if:

• You're moving to New Hampshire or Florida (the two classic Massachusetts exits)
• You split the year between Massachusetts and a second home elsewhere
• You're a remote worker with a Massachusetts employer, or a New Hampshire commuter
• You're approaching a liquidity event (a business sale, IPO, or large vest) that would trigger the 4% surtax
• You just moved in and need to know when Massachusetts residency started

How Massachusetts defines residency

Under M.G.L. c. 62, § 1, you are a Massachusetts resident if either of these is true:

1. You are domiciled in Massachusetts, or
2. You are a statutory resident: you maintain a permanent place of abode in Massachusetts and spend more than 183 days of the taxable year in the state, in the aggregate.

The statutory test is the trap for people who "moved" on paper. Keep a Boston condo available and cross the 183-day line, and Massachusetts taxes you as a full resident on everything, regardless of where you claim to be domiciled. A permanent place of abode is a dwelling you continually maintain, and one owned or leased by your spouse counts as yours.

The two tests are independent: a domiciliary is a resident on zero days in-state, and a non-domiciliary can become one purely on days plus an abode.

Counting the days

Massachusetts counts any part of a day in the state as a full day toward the 183-day statutory test.

• Days spent in the state while on active military duty are excluded by statute.
• The 183-day count is aggregate: scattered days across the year add up, with no requirement they be consecutive.
• The burden of proof is on you. In a residency audit the DOR will happily use cell-phone records, toll transponder data, and card statements to rebuild your calendar. A contemporaneous day log (the kind an app like iReside keeps automatically) is the strongest evidence you can bring.

Domicile: the stickier test

Domicile is your one true home: where your domestic, social, and civic life centers, and where you intend to return. You keep your Massachusetts domicile until you establish a new one and abandon the old one, and the DOR weighs the whole picture:

• Where your spouse and children live and go to school
• The relative size and use of your homes in and out of state
• Where you work, own businesses, and hold professional licenses
• Driver's license, voter registration, vehicle registration, and the address on returns and financial accounts
• Community ties: clubs, congregations, doctors, and where your valuables live

Massachusetts domicile audits look a lot like New York's: a questionnaire, then document demands. A Florida driver's license won't outweigh a family home in Wellesley that stayed furnished and occupied.

Part-year residents and nonresidents

Full-year residents file Form 1. Part-year residents and nonresidents file Form 1-NR/PY (the same form covers both). In your move year, you report worldwide income for the resident portion and Massachusetts-source income for the rest.

Leaving doesn't end Massachusetts' claim on Massachusetts-source income:

• Wages for work physically performed in Massachusetts (the New Hampshire commuter's problem)
• Income from a Massachusetts business, trade, or partnership
• Rent and gains from Massachusetts real estate
• Equity compensation attributable to Massachusetts employment during the grant-to-vest period

And note: the 4% surtax applies to part-year residents and nonresidents too, on Massachusetts taxable income over the threshold; you can't dodge it by moving mid-year and then recognizing a Massachusetts-source gain.

Changing your residency status

Ending Massachusetts residency takes a real move: a new home, a moved family, and day counts you can prove. What holds up when the DOR asks:

• Establish a real home in the new state and actually live in it most of the year
• Sell or lease out the Massachusetts home. Keeping it empty and available invites the statutory-resident test as well as the domicile argument
• Move the family, not just yourself
• Flip the paper trail promptly: license, voter and vehicle registration, physicians, accountants, mailing addresses, homestead-type declarations
• Track your days and stay decisively under 183 in Massachusetts if you keep any abode there
• File a final part-year Form 1-NR/PY with a clean departure date, and answer its residency questions consistently year over year

If a liquidity event is coming, complete and season the move before the gain is recognized. A move dated weeks before a company sale is the fact pattern auditors are trained on.

How Massachusetts enforces its rules

The DOR runs an active domicile and statutory-residency audit program, and the millionaire's surtax has raised the payoff for chasing high earners who decamp to New Hampshire and Florida.

• Expect document requests for calendars, card and bank statements, phone records, E-ZPass history, and utility usage on the Massachusetts home.
• Lookback: generally three years from filing, longer for substantial understatements, and effectively unlimited for years you never filed a Massachusetts return the DOR thinks you owed.
• Stakes: 5% on everything plus 4% above the threshold, interest, and penalties. Short-term capital gains are taxed at 8.5%.

Common mistakes

• Counting on "under 183 days" alone. If Massachusetts is still your domicile, day counts are irrelevant: you're a resident at any number.
• The New Hampshire paper move. Renting a Nashua apartment while the family, house, and office stay in Massachusetts fails both tests and is the DOR's most familiar audit.
• Forgetting the spouse's condo. A permanent place of abode owned or leased by your spouse counts as yours for the statutory test.
• Timing the exit against a sale. The surtax makes move-then-sell audits lucrative; an unseasoned move rarely survives one.
• Ignoring source income. Commuting into Boston after "leaving" keeps your wages Massachusetts-taxable and undercuts your domicile story at the same time.
• No day log. Statutory residency turns on a number; without contemporaneous records, the DOR's reconstruction of that number wins by default.