Massachusetts Tax Residency (183-day rule)

Key parameters
Threshold	183 days
Period / Window	Tax year (1 Jan – 31 Dec)
Counting	Any part of a day
Alternative	Domicile
Additional requirements	Permanent place of abode

This applies to anyone with a home available to them in Massachusetts, whichever state they treat as their own. You are a Massachusetts resident if either of these applies:

• Domicile — Massachusetts is your permanent home, the place you intend to return to whenever you are away.
• Permanent place of abode plus days — you are domiciled elsewhere but maintain a permanent place of abode in Massachusetts and spend more than 183 days of the tax year in the state.

The second route is purely mechanical. It asks only whether a home was available and how many days you were present, and nothing at all about where you consider yourself to live.

A permanent place of abode is a dwelling continually maintained by someone, not necessarily its owner, and it includes a place owned or leased by your spouse. Outside it sit camps, military barracks and housing, institutional rooms such as dormitories and hospitals, university housing open only to those affiliated with it, and any dwelling lacking kitchen and bathing facilities or not winterized.

• The partial-day rule is statutory, not administrative. Because the definition itself counts days spent partly in and partly out of the state, there is no argument that a short visit was not really a day.
• Two states can tax the same year as a resident year. Meeting the Massachusetts test does not change your domicile elsewhere, so both states can charge you as a resident, with credits covering only part of it.
• An abode you seldom use still counts. The test turns on the home being permanently maintained and available, not on how much time you actually spend in it, and a place owned or leased by your spouse counts as yours.
• A dwelling not prepared for winter falls outside it. So do camps, barracks, dormitory and hospital rooms, and any dwelling lacking both kitchen and bathing facilities.
• Active-duty days are not counted. Days spent in Massachusetts while on active duty in the armed forces are excluded from the 183.
• Nonresidents are still taxed on Massachusetts-source income. Falling outside the residency tests narrows what the state reaches rather than ending the filing question.

A resident is taxed on income from all sources while a nonresident pays only on Massachusetts-source income, so an error usually surfaces as out-of-state earnings never reported while another state taxed them too. The Department charges interest from the original due date and adds penalties for filing late and for underpaying, rising where an understatement is treated as more than an honest mistake. Professional tax advice is strongly recommended in situations like this.

An apartment and a heavy commute

You are domiciled in New Hampshire, rent an apartment in Boston all year, and work in the city most weekdays. The abode is maintained and your count passes 183 days, so you are a Massachusetts resident for the year.

Short days that still count

You cross into Massachusetts for part of a day roughly three times a week for client work while keeping a permanent home in the state. Each of those partial days counts in full, so the count reaches the threshold well before a calendar reading of your diary would suggest.

Days without a home available

You spend around 200 days in Massachusetts on a long project, staying in hotels booked week by week with no home available to you. The day count is met but the abode limb is not, so residency does not attach on this route.

• Massachusetts General Laws — Chapter 62, Section 1, definition of resident
• Massachusetts Department of Revenue — Legal and residency status in Massachusetts