Middlesex County, Massachusetts Short-Term Rental Regulations: A 2026 Guide For Airbnb Hosts

Do you own a place in Middlesex County, Massachusetts and you're weighing whether to put it on Airbnb or Vrbo? Well, the good news is that no county official is going to stand in your way, because Middlesex County hasn't had a government since July 11, 1997, the date Chapter 34B, Section 1 of the General Laws abolished it. The catch, mind you, is that Massachusetts hands the power to license, cap, inspect and fine short-term rental operators to cities and towns instead, under a statute whose title says it plainly: Chapter 64G, Section 14, "Regulation of operators by cities or towns".

Which means the honest answer to "can I do this" depends on which side of a street your front door sits on. Cambridge will register you if you live in the unit, or in the one next door in a small building you own outright. Somerville will too, though it stops an empty unit at 90 nights a year. Newton wants you living there nine months out of twelve and expects you to write to your neighbours about it. And Lowell, the county's largest city, says on its own website that short-term rentals are not allowed anywhere in the city, with a thirty-day floor under every residential rental in town.

So let's walk through what it takes to do this properly: which towns let you in and on what terms, what registration costs and how long it lasts, the documents each department wants before it will schedule an inspection, the tax layers that stack on a Middlesex stay in 2026, and how much sharper enforcement has got over the past year. Every figure below comes from a city ordinance, a state statute or the Department of Revenue's own pages, and where I couldn't confirm something I've said so rather than guessed. Before you spend a dollar on furniture, run the property through BNBCalc first.

What are Short-Term Rental (Airbnb, VRBO) Regulations in Middlesex County, Massachusetts?

Before any of that math means anything, you need to know which rulebook covers your address, and in Middlesex that list is shorter than most people expect. There are two layers here rather than three. State law is the same whether you're in Winchester or Wilmington, whereas the municipal layer changes completely at the town line.

Nothing sits in between, because the county government is gone. The statute is blunt about it: the government of each abolished county "is hereby abolished as of the following date," and for Middlesex that date was July 11, 1997.

What survived is a pair of registries of deeds that still carry the county name. The Middlesex North Registry sits at 370 Jackson Street in Lowell and covers Billerica, Carlisle, Chelmsford, Dracut, Dunstable, Lowell, Tewksbury, Tyngsboro, Westford and Wilmington, while the Middlesex South Registry at 208 Cambridge Street in Cambridge handles everywhere else. They record deeds. That's the whole job, so neither one licenses a rental, inspects a bedroom or collects a fee from a host.

The municipal layer, on the other hand, is where the teeth are, and Section 14 spells out how sharp a Massachusetts city or town may make them. Under it a municipality can:

• cap the number, class or location of local licences, and cap the days per year a unit may be rented;
• require its own registration on top of the state's, or accept the state certificate instead;
• demand proof that a property carries no open building, fire, health or zoning violations;
• charge for inspections, and set its own civil penalties and fees;
• publish a public registry naming every short-term rental in town.

Four Middlesex cities have used most of that list, while most of the rest have used none of it, which is why two towns a mile apart can look nothing alike.

Above all of it sits the state framework, and nobody opts out of that part. Every operator registers with the Department of Revenue under Chapter 62C, Section 67, carries at least a million dollars of liability cover, and collects room occupancy excise on stays of 31 days or fewer. That much is settled. The town line is where the guesswork starts.

Starting a Short-Term Rental Business in Middlesex County

Since the town line decides everything, the first thing to settle is which town you're actually in, because four of them have written real ordinances and their answers differ more than you'd think.

Cambridge permits short-term rentals as an accessory residential use, and Section 4.60 of the Zoning Ordinance, ordained 9-0 in August 2017, allows exactly two shapes. The first is an operator-occupied rental, meaning up to three legal bedrooms inside the unit you live in. The second is an owner-adjacent rental, which is a whole separate unit in a building of four units or fewer where you own every unit and live in one of them. You can hold one of each and nothing beyond that, so a third listing is out. An owner-adjacent unit also goes to one party at a time as a whole unit rather than room by room, and if you leave your own home for more than seven consecutive days, that one flips to the same rule.

Somerville is stricter in one specific way that catches people out. Its short-term rental ordinance, amended in January 2023 to add registration, requires the unit to be your primary residence, and it defines that as living there nine months out of any twelve. So there's no owner-adjacent option at all, and the city's own short-term rental policy page answers the question directly: you cannot offer an adjacent unit.

Stay in the home while guests are there and you can rent it 365 days a year, whereas if you leave the unit empty, you're capped at 90 days in a year. Either way it's one group at a time, up to ten people or two per guest bedroom, whichever is fewer.

Newton runs the same owner-occupancy logic through a much heavier notification process. Its ordinance took effect in January 2020, and the city's short-term rental information page sets the working limits: three bedrooms, nine guests, one property, and it has to be the home you occupy nine months of the year.

Then comes the part nobody expects. Within thirty days of registering, and again every January, you have to notify your abutters, the owners across the street, and the abutters to your abutters, giving each of them your name, your local contact and your state registration number.

Lowell is the outlier, though, and it's the one that reshapes any county-wide plan, since the city states flatly that short-term rentals aren't allowed and that every residential rental runs a minimum of thirty days. That isn't a hurdle you can clear with paperwork either, because the Lowell Zoning Ordinance only ever makes room-renting an accessory use for "not more than two (2) non-transient roomers or boarders," and a weekend guest is the definition of transient. Unfortunately for anyone holding a Lowell duplex, there's no application to fill in. The category doesn't exist.

So read those four together, because the pattern is hard to miss. Middlesex is not a county where you buy a triple-decker, furnish all three floors and list them, since owner-occupancy is the price of admission almost everywhere that says yes at all. The realistic model is a spare bedroom, a hosted unit, or the one small building you live in yourself. Investors after somewhere less restrictive will find more room in our Cape Cod short-term rental guide or the Worcester County guide next door.

One more thing is worth knowing before you plan around a new build. The state's accessory dwelling unit law now allows protected-use ADUs by right in single-family zones. Even so, the ADU frequently asked questions published by the Executive Office of Housing and Livable Communities are explicit: a municipality "may restrict or prohibit the use of a Protected Use ADU as a Short-Term Rental." Lowell's page shows a town doing exactly that, so build the ADU if the numbers work as a long-term rental, but don't assume the nightly-rate version comes with it.

Short-Term Rental Licensing Requirements in Middlesex County

Assuming your address clears that occupancy test and you're able to move forward, the next question is what registration costs and how long the certificate lasts, which varies by a factor of five across three neighbouring cities.

City	What it costs	How long it lasts	Inspection before the certificate
Cambridge	$500, or $100 a year across five years	Five years, ending early on a change of owner or operator	Yes, by Inspectional Services
Somerville	$250, paid as $50 at filing and $200 on approval	To the next March 31, with renewals opening February 1	Yes, a pre-certificate safety inspection
Newton	$100 filing fee, plus the fire inspection fee paid directly	Annual sworn re-certification each January	Yes, a Fire Department smoke and carbon monoxide inspection
Lowell	No registration exists	Not applicable	Not applicable

Cambridge's Short-Term Rental Guide sets out the payment plan: pay $500 up front, or $100 at filing and $100 a year for the next four, with the certificate revoked immediately if you miss one. Inspectional Services inspects before it issues, then again every five years or on a change of ownership. Do check your unit's status first, though, because a home in the Inclusionary Housing Program, or one below market rate or income-restricted under any law, isn't eligible at all.

Somerville's application process guide splits the money in two, and the second half is what people forget: $50 goes in with the application, then $200 more once Inspectional Services has reviewed it. The certificate expires the following March 31 whenever you got it, so a September approval buys you about seven months. Renewals open on February 1, so put that date somewhere you'll see it.

Newton puts the sequence in a different order, and getting it wrong costs you weeks. You register with the state first, then book the Fire Department inspection and collect a Certificate of Compliance for smoke and carbon monoxide alarms, and only then do you file with Inspectional Services. That last filing is where the ordinance sets a $100 fee and calls for a sworn certification of continued compliance on the first business day of every January.

Keep in mind that the city checks the property for open permits and open violations as part of that review, so anything unresolved has to be closed out before your file moves.

Two obligations then run everywhere once you're approved. Your registration number goes in every listing on every platform, and Somerville also wants a link to each listing. It then publishes a registry of every certificated rental in the city, address and number included, which is every bit as useful to an annoyed neighbour as it is to you.

The penalties are modest per day and unpleasant per month. Cambridge fines code and ordinance violations up to $300 a day, while Newton charges up to $300 per violation and $300 a day for operating unregistered, each day counting as its own offence. Somerville enforces by non-criminal disposition under Chapter 40, Section 21D of the General Laws, and adds a rule with real bite: three or more violations at a property inside six months makes every unit in it ineligible for six months.

Required Documents for Middlesex County Short-Term Rentals

Since none of those departments will schedule an inspection until the file is complete, it's worth getting the paperwork right the first time rather than watching an application sit.

Start with the one document every Middlesex city asks for, because it comes from the state rather than the town. That's your Certificate of Registration from the Department of Revenue, issued per property once you add a Room Occupancy Consolidated account in MassTaxConnect. Newton and Somerville both want it inside the application packet. Get that one first, before you start anything local.

After that the lists converge on the same handful of items:

• Proof that you live there. Cambridge takes enrolment in its residential tax exemption programme, or an affidavit signed under the pains and penalties of perjury plus a photo ID and a government or utility letter under three months old. Somerville wants a deed or lease, a driver's licence, and one more document showing residency. Newton wants two of: utility bill, voter registration, motor vehicle registration, deed, lease or state-issued ID.
• Written permission, if the property isn't purely yours. Tenants need the owner's approval on the city's own form. Condominium owners need the association's approval too, which Cambridge names explicitly.
• Proof of insurance. Massachusetts requires at least $1,000,000 of liability cover per short-term rental, and Somerville's guide says its inspectors accept a certificate of insurance for "not less than $1,000,000."
• A floor plan. Cambridge wants one showing which bedrooms are offered, and hand-drawn is fine as long as it's legible and labelled. Somerville checks the floor plan at the inspection itself.
• A local contact. Somerville and Newton both want a named person who can reach the property within two hours, on a phone number that's live 24 hours a day to guests and to public safety agencies.
• Your listings. Booking platform names, plus the URL or listing ID for each one.
• House rules, in Newton. Written rules on noise, disorderly behaviour, rubbish, parking and occupancy limits, handed to guests before arrival and posted inside.

Two postings get forgotten more than anything else, so do them on day one. Cambridge and Somerville both want the certificate of registration inside the unit, along with waste and recycling instructions, parking rules and emergency exit information.

Newton goes further still. It wants a permanent log of every occupant, with names, addresses, vehicle licence plates, dates of stay and the room assigned, ready for any city official who asks.

Middlesex County Short-Term Rental Taxes

Assuming you get through all of that and are able to start hosting, there's still tax to deal with, and since the state and your town each set a piece of it, the layers don't line up as neatly as you'd hope.

Charge	Rate	Who sets it	Who collects it
State room occupancy excise	5.7%	Massachusetts	Dept. of Revenue
Local option room occupancy excise	up to 6%, adopted town by town	your city or town	Dept. of Revenue
Convention Center Financing surcharge	2.75%	state statute, Cambridge only in Middlesex	Dept. of Revenue
Community impact fee	up to 3% on professionally managed units	your city or town	Dept. of Revenue

The base layer is the state room occupancy excise. The Department of Revenue's room occupancy excise page puts the working rate at 5.7%, and that's the 5% written into Chapter 64G, Section 3 plus an uncodified 0.7% surtax sitting on top of it. It reaches stays of 31 days or fewer. Under $15 a day in rent, though, there's no excise at all.

On top of that comes the local option excise, which Chapter 64G, Section 3A caps at 6% and leaves to a council or town-meeting vote, so not every town has taken it. The Department of Revenue's Room Tax and Impact Fee databank, showing data as of May 2026, counts 234 Massachusetts municipalities with a rooms tax and 43 with a short-term rental community impact fee.

So the local number matters more than the ceiling does. Cambridge has sat at the 6% ceiling since October 2009 and Arlington since January 2010, while Acton is still on 4% under a rate it adopted back in 1986, and Belmont's 6% only took effect on January 1, 2026. That report is paginated and I could only read the first page, so make sure you look your own town up rather than assuming the ceiling.

Two extra layers then catch specific hosts. The first is the community impact fee, and Chapter 64G, Section 3D lets a town charge up to 3%, though only on professionally managed units, meaning an operator's second or later unit outside their own home. Cambridge and Arlington have both adopted it, and since a Cambridge owner-adjacent rental is by definition a unit you don't live in, that fee is worth raising with Inspectional Services before you price the calendar.

The second is the Convention Center Financing surcharge of 2.75%, which Technical Information Release 05-1 limits to six municipalities statewide. One of them is Cambridge, and it's the only Middlesex city on the list.

All of it lands on a single monthly return through MassTaxConnect, filed by whoever collected the rent. That last part matters, because Airbnb's Massachusetts tax page says the platform collects the occupancy taxes and pays them over, which means plenty of hosts never touch the money.

You still have to register with the Department of Revenue either way, even if you rent for a handful of nights. An operator expecting 14 rental days or fewer in a year can elect out of collecting, mind you, but only by filing that election by January 15.

Tax Deductions for Short-Term Rentals

Registration and collection are one side of tax. Your own income tax is a separate matter, though, and renting rooms inside a home you live in makes it fiddlier than a spreadsheet suggests.

The federal rule that surprises small hosts most is the minimal-use one, and IRS Topic 415 states it plainly. If you use a dwelling as a residence and rent it for fewer than 15 days in the year, you report none of the rental income, and you deduct none of the rental expenses either. Above that threshold you divide every shared expense between rental and personal use by the days each, which is where hosting inside your own home gets awkward. Mortgage interest, insurance, utilities, cleaning and depreciation: none of it comes off in full while you're living in the same unit.

Remember too that the state's 14-day exemption election and the federal 15-day rule are different tests with different deadlines, so clearing one tells you nothing about the other.

Massachusetts Wide Short-Term Rental Rules

Both of those tax rules come from above your city hall, which is a decent reminder that most of what governs a Middlesex rental was written at the State House rather than in your town.

The whole modern framework dates to Chapter 337 of the Acts of 2018. That law extended the room occupancy excise to short-term rentals and created the state registration requirement, then deliberately handed broad regulatory authority back to cities and towns. There's no preemption in Massachusetts, and no statewide cap on what a town may do. That's exactly why one Middlesex city charges $500 for a five-year certificate, another charges $250 a year, and a third refuses the whole category.

Three statewide obligations follow you regardless of address. The first is registration with the Department of Revenue, per property, with the certificate posted in the unit and its number handed to any platform handling your bookings. The second is liability cover of at least $1,000,000 per short-term rental, unless the platform carries as much, and the state's short-term rental insurance guidance warns that an insurer who wasn't told can exclude the claim or cancel the policy outright.

The third is fire safety information posted inside every unit, covering extinguishers, exits and gas shut-offs.

The ADU law is the newest wrinkle, and it's the one most likely to catch a 2026 buyer. Protected-use ADUs are now allowed by right in every zoning district that permits single-family homes, which sounds like a gift to a host until you read the short-term rental carve-out and realise your town can switch that use off. Watch out for it in any pro forma built on renting the new unit nightly.

One bill is still moving, and it's worth tracking rather than planning around. S.2736, the Maggie Hubbard rental safety act, would set inspection requirements for buildings used as short-term rentals. It went to the Public Safety and Homeland Security committee in July 2025, and it was heard that November and is still pending as of a January 2026 check. Nothing in it is law yet.

For the wider picture beyond this county, our Massachusetts statewide guide maps the rest of the state, while the Somerville guide goes deeper on the one Middlesex city with a public registry.

Does Middlesex County Strictly Enforce STR Rules?

Pending bills aside, the enforcement that's happening right now is entirely municipal, and over the past year it's got noticeably sharper in the two cities with the most listings.

Cambridge is the clearest case, because the city has published its own estimate of the gap. Reporting the June 22, 2026 council meeting, Cambridge Day records Inspectional Services estimating that fewer than a third of the city's short-term rentals comply: 216 registered, against roughly 500 operating illegally.

But at that same meeting the council also accepted an ordinance petition from Councillors Jivan Sobrinho-Wheeler and Patty Nolan that would flip the enforcement target onto the platforms. Booking companies would then have to register with the city and pay $300 a day per violation for listing an unregistered unit, and stays would be capped at 90 days. It passed unanimously to a second reading. Be aware that a petition at second reading isn't a rule, so don't price it in yet, though the direction of travel here is not subtle.

For scale on the legal side, Cambridge publishes its registrations as open data, and that dataset holds 561 completed registrations issued since 2018, of which 376 are operator-occupied and only 184 owner-adjacent. Most of the legal market here is a spare bedroom rather than a second unit.

Newton's numbers are smaller and its enforcement is more hands-on. Reporting the March 23, 2026 Zoning and Planning Committee meeting, Fig City News quotes Commissioner Anthony Ciccariello putting 24 short-term rentals on the city register with seven more in process, against 175 to 200 Newton properties registered with the state. Since November 2025 the department has issued 32 civil fines totalling $21,300, about half of them paid, and sent 77 letters to owners.

An earlier account of the October 2025 committee meeting fills in the method. The department reads the ads rather than waiting for complaints, and a 2024 amendment made the property owner solely responsible, so operators can no longer point at each other when a letter lands. Newton has also asked the legislature for a home rule petition raising its maximum fine from $300 to $2,000, on the reasoning that a busy listing can out-earn a $300 day.

The mechanism behind both stories is the same, and it's the thing that genuinely changed since 2024. Cities now cross-reference the state's registry of registered operators against live listings on Airbnb and Vrbo. A property that appears on one and not the other is a two-minute find. That's how Newton located its first tranche of violators, without a single neighbour complaint.

Somerville leans on transparency instead, since its public registry lets anyone check an address, and its three-violations-in-six-months rule takes a whole property out of the market rather than issuing another ticket. Lowell needs no enforcement machinery at all. There's nothing to enforce, because no permit exists and no exception is worth arguing about.

How to Start a Short-Term Rental Business in Middlesex County

Given how quickly a registry cross-reference can find an unregistered listing, the order of the steps below matters more than it looks, because the early ones tell you whether the later ones are worth paying for.

1. Confirm your town allows it before you spend anything. Call the building or inspectional services department and ask whether the town has a short-term rental ordinance. In Lowell the answer ends the conversation, and where there's no ordinance at all, ask how zoning treats transient occupancy instead, because silence is not the same as permission.
2. Check that you can meet the occupancy test. Cambridge, Somerville and Newton all require the unit to be your primary residence, and Somerville and Newton both define that as nine months out of twelve. An absentee whole-unit rental isn't on the menu in any of them.
3. Read your lease, condominium bylaws and house rules. A city ordinance doesn't override a private agreement, and Cambridge says so directly. Tenants need the owner's signed approval on the city's own form too.
4. Register with the Department of Revenue. Add a Room Occupancy Consolidated account in MassTaxConnect and get your Certificate of Registration for that specific property, since Newton and Somerville both want it in the application packet.
5. Sort out insurance and tell your insurer. You need at least $1,000,000 of liability cover, and notifying your existing homeowners or renters insurer is a legal requirement rather than a courtesy.
6. Clear open permits and violations. Newton and Somerville both check, and an open building permit or unresolved code violation will stall the application or sink it.
7. Book the inspection in the right order. In Newton the Fire Department smoke and carbon monoxide inspection comes before you file, whereas in Cambridge and Somerville the inspection follows a complete application.
8. File, pay and post. Pay the fee your city sets, then post the certificate inside the unit along with waste, parking, noise and emergency exit information, and put the registration number into every listing you run.
9. Diarise the renewal. Somerville expires every March 31 with renewals opening February 1, Newton needs a sworn certification and a fresh abutter notice each January, and Cambridge re-inspects every five years or on a change of owner.

Who to Contact in Middlesex County about Short-Term Rental Regulations and Zoning?

Whichever step you get stuck on, there's no county office to ring, so it's worth knowing which department owns your question before you spend a morning on hold.

State registration and tax

The Massachusetts Department of Revenue handles operator registration, the room occupancy excise and every local layer riding on it, since your city never collects the money.

• Phone: (617) 887-6367, 9 a.m. to 4 p.m., Monday through Friday, per the department's own who to call at DOR guide
• Register and file: MassTaxConnect, adding a Room Occupancy Consolidated account
• Address: Massachusetts Department of Revenue, 100 Cambridge Street, Boston, MA 02114

Cambridge

Inspectional Services administers Section 4.60, issues the certificate and runs the inspection.

• Address: 831 Massachusetts Ave., 1st Floor, Cambridge, MA 02139
• Phone: 617-349-6100
• Email: [email protected]
• Hours: Monday 7 a.m. to 6 p.m., Tuesday to Thursday 7 a.m. to 3:30 p.m., Friday 7 a.m. to noon
• Apply: through the city's register a short-term rental page, which also hosts the Statement of Responsibility and the property owner affidavit

Somerville

Inspectional Services runs registration through the CitizenServe portal and keeps the public registry.

• Email: [email protected], which the city says gets a faster response than the phone
• Phone: (617) 625-6600, extension 4331
• Guidance: the city's short-term rental policy page carries the ordinance, the application guide and the FAQ

Newton

Inspectional Services takes the registration and the annual certification, while the Fire Department handles the smoke and carbon monoxide inspection that has to come first.

• Address: City Hall, 2nd Floor, Room 202, 1000 Commonwealth Avenue, Newton, MA 02459
• Phone: (617) 796-1060, with Commissioner Anthony Ciccariello on (617) 796-1064
• Hours: City Hall is open Monday to Friday, 8:30 a.m. to 5 p.m.
• Complaints: the online Request for Zoning Enforcement form, which is also how a neighbour would report you

Lowell

The Division of Development Services covers zoning, permitting and the ADU rules, and it's the office that will confirm the thirty-day minimum applies to your property.

• Phone: 978-674-4144

Everywhere else in the county

For towns without a dedicated ordinance, start with the building commissioner or inspectional services department at town hall and ask two things: whether the town regulates short-term rentals by bylaw, and how the zoning bylaw treats transient occupancy in your district. Then look your own tax rates up on the Department of Revenue's databank rather than assuming.

What Do Airbnb Hosts in Middlesex County on Reddit and Bigger Pockets Think about Local Regulations?

Those offices give you the official version. What hosts say among themselves runs in a different register, and what follows is my read of the public record rather than any kind of survey, so do weigh it accordingly.

The oldest and most durable complaint is about owner-occupancy, and a BiggerPockets thread on Somerville captures the moment it lands. A first-time investor models a $1.1 million four-unit building at $220 a night, and a Somerville investor replies that none of it is legal, since renting a whole unit there is forbidden and a three-family brings sprinkler rules a two-family doesn't.

The thread dates from 2019, and its closing note is the one that's aged worst: everyone rents them illegally anyway, because there was never any real enforcement.

That assumption is what the past two years have dismantled. When a city can put 216 registered rentals next to roughly 500 unregistered ones, or 24 next to 175, it isn't guessing at the size of the grey market, and the cities publishing those numbers are the same ones sending the letters. Newton's $21,300 in fines since November 2025 isn't a large sum against a portfolio, granted, but the department got there without waiting for a single complaint.

The second recurring theme is the paperwork rather than the rules. Hosts who qualify grumble about sequencing more than substance, and Newton is the classic example: state certificate, then fire inspection, then city filing, in that order, or you start again. The rules themselves, once you've sat down and read them, are not ambiguous.

Investors, meanwhile, have mostly stopped arguing. Owner-occupancy in Cambridge, Somerville and Newton means the whole acquisition thesis has to include living in the building, and Lowell removes the option altogether. If you want to see how those constraints translate into what a unit actually earns, our Massachusetts market data is the place to check the numbers before an ordinance decides them for you.

Which is the real lesson here, and it isn't specific to Middlesex. Wherever a state pushes rental policy down to the municipality, the map worth reading isn't the county or the metro. It's the town line. Two addresses a mile apart can be the difference between a business and a fine.

Frequently Asked Questions

Can you run an Airbnb in Middlesex County, Massachusetts in 2026?

In most of the county, yes, though the permission comes from your city or town rather than the county, which hasn't had a government since 1997. Cambridge, Somerville and Newton all register short-term rentals, and all require the property to be your primary residence or, in Cambridge, a unit next door in a small building you own. Lowell prohibits them outright, with a thirty-day minimum on every residential rental.

How much does it cost to register a short-term rental in Middlesex County?

It depends entirely on the city. Cambridge charges $500 for a five-year certificate, or $100 a year across those five years on a payment plan. Somerville charges $250, split as $50 at filing and $200 on approval, and the certificate expires the following March 31. Newton's ordinance sets a $100 filing fee plus the fire inspection fee paid directly to the Fire Department, with a sworn re-certification every January.

What taxes apply to a short-term rental in Massachusetts?

The state room occupancy excise runs at 5.7% on stays of 31 days or fewer, with no excise where the rent is under $15 a day. A city or town may add a local option excise up to 6% and, if it has adopted that, a community impact fee up to 3% on professionally managed units. Cambridge also falls inside the 2.75% Convention Center Financing surcharge. Airbnb collects and pays over Massachusetts occupancy taxes, but every operator still registers with the Department of Revenue.

Do I have to live in the property to run a short-term rental in Cambridge or Somerville?

Yes in both, with one narrow exception. Somerville requires the unit to be your primary residence, meaning nine months out of twelve, and there's no adjacent-unit option. Cambridge allows an operator-occupied rental of up to three bedrooms in your own unit, or an owner-adjacent rental of a whole unit in a building of four or fewer where you own them all and live in one. Absentee whole-unit rentals aren't permitted in either city.

What happens if you rent short-term without registering?

Cambridge fines ordinance and code violations up to $300 a day. Newton charges $300 a day for operating unregistered, each day a separate offence, and has asked the legislature to raise its cap to $2,000. Somerville makes an entire property ineligible for six months after three violations inside six months. All three cities now compare the state's operator registry against live platform listings, so an unregistered listing is easy to spot.

Last verified: July 2026. Every ordinance, tax rate, state law, and contact detail in this guide links to or comes from its official source.