Short-Term Rentals in Boston, MA: Registration, the Three License Types and the Metro-Area Traps
Boston's own eligibility file showed 963 addresses with an issued short-term rental registration on July 28, 2026, against 71,468 addresses the city marks as eligible for at least one license type. The gap is the story: the license costs $25 or $200 a year, but all three types tie the permission to an owner who actually lives in the building.
Every figure below comes from boston.gov, data.boston.gov, mass.gov, cambridgema.gov or somervillema.gov, linked where it appears, with the date the number refers to. If a figure is not published, this page says so instead of guessing.
Capitolo 01 / 08
01 — The three license types, and what each one lets you do
Boston's rules live in Chapter 9-14 of the City of Boston Code of Ordinances, added by an ordinance filed in City Council on June 13, 2018 and effective January 1, 2019. Units already under executed short-term rental leases as of June 1, 2018 got a sunset period that ran to the end of the lease term or September 1, 2019, whichever came first — so there is no grandfathered inventory left.
A "Short-Term Rental" under § 9-14.2 is occupancy of a residential unit for a fee for fewer than 28 consecutive calendar days. Not 30. That number matters more than it looks, and section 05 explains why.
| Type | What it is | Occupancy cap | Annual fee |
|---|---|---|---|
| Limited Share Unit | Part of the operator's primary residence, rented while the operator is present. One bedroom must be reserved for the operator. | 3 bedrooms or 6 guests, whichever is fewer | $25 |
| Home Share Unit | The whole unit, where that unit is the operator's primary residence. | 5 bedrooms or 10 guests, whichever is fewer | $200 |
| Owner-Adjacent Unit | A second unit in the same dwelling as the operator's primary residence, owned by the same owner-occupant. Allowed only in two-family or three-family dwellings where all units share that single owner-occupant. In a three-family, one owner-adjacent unit maximum. | Not separately capped in § 9-14.2 | $200 |
Fees are set in § 9-14.6(b) and confirmed on the city's short-term rentals page. Unlike New York or Somerville, Boston imposes no annual night cap: § 9-14.5 permits all three types for 365 days a year. The constraint is not the calendar, it is who you are — and an operator may hold only one whole-unit listing at a time.
What Boston does not have is an investor category. There is no license for a condo you own and do not live in, none for a triple-decker you rent out entirely, none for a portfolio. If the unit is not your home or the unit next door to your home in a building you fully own, Chapter 9-14 has nothing to sell you.
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02 — The residency test, and who is allowed to be the operator
Two definitions in § 9-14.2 do most of the gatekeeping.
Operator. "A natural person who is the owner of the Residential Unit." Only one owner may be registered per unit, and it is unlawful for any other person to offer that unit — even another owner who would independently qualify. An LLC cannot be the operator. A property manager cannot register a unit for a client, and neither can a co-host: the registration belongs to the resident owner, full stop.
Primary Residence. The unit in which the operator resides "for at least nine months out of a twelve-month period." At registration you must show either that you have already lived there nine of the past twelve months, or that you intend to live there nine of the next twelve — proved by at least two of: a utility bill, voter registration, motor vehicle registration, the deed, a lease, a driver's license or state ID, or proof of the residential tax exemption.
Two consequences worth planning around. First, § 9-14.6(d) requires an operator who stops being the primary resident to notify Inspectional Services immediately so the unit comes off the registry — the license does not survive your move. Second, § 9-14.6(c) ties the registration to both the unit and the operator, so it does not transfer on sale; a buyer must re-register from scratch.
The state's separate rules point the same way. Massachusetts requires every non-exempt operator to register each property with the Department of Revenue through MassTaxConnect and to carry at least $1,000,000 of liability insurance per short-term rental, which platforms may supply, per mass.gov. Registered properties appear in the state's Public Registry of Lodging Operators.
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03 — Ineligible units: Problem Properties and the rest of the screen
Boston maintains an Ineligible Units List under § 9-14.4A. Four categories are locked out:
- Income-restricted and subsidized units — anything designated below market rate, subject to an affordability covenant, or receiving housing or rental assistance under local, state or federal law.
- Units where another law forbids it — any unit subject to a local, state or federal requirement prohibiting leasing, subleasing or short-term rental use.
- Problem Properties. Units inside a property designated a "Problem Property" or "Public Nuisance Property" by the Mayor's Problem Properties Task Force under Chapter 9-13.1(e) and Chapter 16-57.2 — and units in any property owned by an owner who owns any other currently designated Problem Property anywhere in the city. That second limb is the one investors miss: one bad building taints the rest of the portfolio.
- The three-strikes rule. Units that are the subject of 3 or more findings of violation of § 9-14, or 3 or more violations of any municipal ordinance or state law relating to excessive noise, improper trash disposal, disorderly conduct or similar conduct, within any six-month period. The city dates this clock from January 1, 2019.
Separately, § 9-14.5(g) blocks registration for any unit carrying outstanding building, sanitary, zoning or fire code violations, abatement orders or stop-work orders — and if such an order lands after you are on the registry, ISD suspends the registration until it is cured.
Two carve-outs are worth knowing. Dwellings holding a valid lodging-house certificate of occupancy or Boston Licensing Board lodging license, and existing bed and breakfasts with a valid B&B certificate of occupancy, as of the effective date of § 9-14, must register but are exempt from the type limitations in § 9-14.5(b), (c) and (d). And under § 9-14.4B(d), furnished institutional or corporate stays with a minimum stay of at least ten days, under contract between the building owner, a corporate housing operator and an institution or business, are not short-term rentals at all.
How much inventory the screen actually removes
The city publishes its whole eligibility determination as the Short-Term Rental Eligibility dataset on Analyze Boston. In the file as updated July 28, 2026, across 399,849 address records:
| Flag in the July 28, 2026 file | Addresses |
|---|---|
| Eligible for at least one license type | 71,468 |
| Home-share eligible | 47,703 |
| Limited-share eligible | 47,703 |
| Owner-adjacent eligible | 23,765 |
| Income restricted | 43,116 |
| Flagged as a Problem Property | 2 |
| Flagged as owned by a Problem Property owner | 2 |
| Carrying an issued registration | 963 |
Read those rows carefully. Home-share and limited-share eligibility are identical counts because they run the same owner-occupancy test on the same units. Owner-adjacent eligibility is a disjoint set — by definition it is not the operator's home — which is why the three columns add exactly to 71,468. The Problem Property flags are near-empty in this file; the screen that removes real volume is income restriction, at 43,116 addresses.
And the business fact: 963 issued registrations against 71,468 eligible addresses is roughly 1.3% take-up. Boston's rules do not so much forbid short-term rental as make it a thing almost no eligible household bothers to do.
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04 — Registering, and the duties that follow
Applications go through the city's Short Term Rental Registration portal. A registration runs for a calendar year, January 1 to December 31, and the number issued is tied to one specific unit and one specific operator.
At registration you certify that you own the unit and that short-term rental use complies with applicable condominium documents and bylaws — Boston does not enforce your condo docs for you, but it makes you attest to them. You must also give a local contact who can respond in person to any issue or emergency within two hours, on a phone number staffed 24 hours a day and reachable by tenants, guests and public-safety agencies.
Once registered, § 9-14.5 keeps going:
- Registration number in every listing or advertisement. No exceptions.
- Fire-safety sign posted inside the unit, showing the location of all fire extinguishers in the unit and, where applicable, the extinguishers, fire exits and pull alarms in the building.
- Abutter notice. Within 30 days of approved registration, notify every residential dwelling within 300 feet that the unit has been registered.
- Records kept 3 years from the date of registration: months of residence, proof of ownership, and days per year the unit was offered — produced to ISD on written request.
- Units already covered by Chapter 9-1.3 rental inspection remain subject to it, fees included.
Platforms carry their own load. Under § 9-14.11 a booking agent must file a monthly electronic report to the city listing every unit it advertises in Boston, whether each listing is a room or a whole unit, and the number of nights each was occupied. Under § 9-14.10(b) the Commissioner enters into enforcement agreements with booking agents to de-list ineligible units and block listings without a valid registration number — and any booking agent that refuses such an agreement "shall be prohibited from conducting business in the City." The city and Airbnb announced an agreement to strengthen the registry and remove illegal units on that basis.
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05 — The tax stack: 14.95% in Boston, and the 28-versus-31-day trap
Massachusetts extended the room occupancy excise to short-term rentals from July 1, 2019, per TIR 19-3. The components, per the DOR's Room Occupancy Excise Tax page:
| Component | Rate | Applies |
|---|---|---|
| State room occupancy excise | 5.7% | Statewide |
| Local option excise | up to 6% — 6.5% for Boston | Where the municipality has adopted it |
| Convention center financing fee | 2.75% | Boston, Cambridge, Worcester, Springfield, West Springfield, Chicopee |
| Community impact fee | up to 3% | Only where locally adopted, and only for operators with more than one property in that municipality, or renting an owner-occupied two- or three-family short-term |
| Cape Cod & Islands Water Protection Fund | 2.75% | Member towns only — not Boston |
For Boston that is 5.7 + 6.5 + 2.75 = 14.95% before any community impact fee. Whether a given city has adopted the local option or the community impact fee is a municipal vote: check the DOR's Local Option Excise Taxes list rather than assuming, and note that a Boston owner-adjacent unit is precisely the fact pattern the community impact fee was written for.
Then the trap. The state excise reaches rentals of 31 days or less. Boston's ordinance reaches stays of fewer than 28 consecutive days. So a 29-night stay in Boston needs no Chapter 9-14 registration and still owes the full 14.95%. Conversely, if a property is rented 14 days or fewer in a calendar year you owe no tax, but you must tell DOR at registration — the deadline for claiming that exemption is January 15 of the year claimed.
Federal treatment is a separate question that turns on average length of stay rather than on any city rule; see our note on the seven-day average stay threshold and material participation before assuming a Boston room behaves like a rental property on your return.
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06 — Enforcement, hearings and what the fines actually are
Chapter 9-14 runs on complaints. Anyone may file one with ISD naming the address, unit, date and nature of the alleged violation. The Commissioner has 30 days to investigate and, on finding a potential violation, serves notice on the registered operator — or, if the unit is not on the registry, on the owner or resident agent of record.
You then have 14 days to petition in writing for a hearing, which must be held no later than two weeks after ISD receives the petition, with a written decision within seven days of its conclusion. Filing the petition stays the remediation clock. Skip the petition, or lose it, and each day of non-compliance is a separate violation.
| Conduct under § 9-14.9 | Penalty |
|---|---|
| Offering an ineligible unit as a short-term rental — or a booking agent accepting a fee to book one | $300 per violation per day |
| Offering an eligible unit without registering, or while the registration is suspended | $100 per violation per day |
| Failing to comply with a notice of violation or other order | $100 per violation per day |
ISD may also seek an injunction. Enforcement runs through the non-criminal disposition process of M.G.L. c. 40, § 21D and through M.G.L. Chapter 40U — the "green ticket" law — as accepted by the City of Boston. Chapter 9-14 also obliged the ISD Commissioner to file an annual report with the City Clerk by June 30 each year from 2019, estimating units removed from long-term housing stock and the revenue differential between short-term and long-term letting of an owner-adjacent unit.
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07 — Cambridge and Somerville are different cities with different rules
This is where metro-area operators lose money. Boston, Cambridge and Somerville are separate municipalities that wrote separate ordinances, and they disagree on the three things that matter most: how long "short-term" is, who may be the operator, and whether a second unit is allowed at all.
| Boston | Cambridge | Somerville | |
|---|---|---|---|
| Instrument | Code of Ordinances ch. 9-14, effective Jan 1, 2019 | Zoning Ordinance § 4.60 (Ordinance 1397), effective Apr 1, 2018 | STR section of Code ch. 7, passed May 2019, effective Jan 1, 2020; registration required from Apr 1, 2023 |
| "Short-term" means | fewer than 28 consecutive days | less than 30 consecutive days | less than 28 consecutive days |
| Who may be the operator | the natural-person owner only | owner or primary leaseholder with written owner permission | owner or a renter filing a property-owner approval affidavit |
| Types allowed | Limited Share, Home Share, Owner-Adjacent | operator-occupied (up to 3 bedrooms, operator present) and owner-adjacent | primary residence only |
| Second/adjacent unit | 2- or 3-family only, all units one owner-occupant, one unit max | building of 4 units or fewer, all owned by the operator, rented whole to one party | not allowed |
| Unhosted-night cap | none — 365 days | none in § 4.60 | 90 days per year, aggregate |
| Registration fee | $25 / $200 / $200, annual | $500, or $100 a year over five years; certificate valid 5 years | not published on the city STR page — confirm with ISD |
| Inspection | not required by ch. 9-14; ch. 9-1.3 rental inspection applies separately | required before issue and at every five-year renewal | see city STR page |
| Fine | $300/day ineligible, $100/day unregistered | up to $300 a day | $300 per violation per day in the ordinance text |
| Occupancy | per license type (see § 01) | 3 bedrooms operator-occupied; owner-adjacent whole unit to one party | one party only, 10 guests or 2 per guest bedroom, whichever is fewer |
Sources: Cambridge's Short-Term Rental Guide and registration page; Somerville's Short-Term Rental Policy and ordinance text.
Four practical readings:
- A tenant can host in Cambridge and Somerville. A tenant cannot host in Boston. Boston's operator must be the owner; Cambridge accepts the primary leaseholder with written owner permission, Somerville a renter with an owner affidavit. Same metro area, opposite answer.
- Cambridge's owner-adjacent rule is wider than Boston's — up to four units in the building rather than three — but the certificate costs $500 and requires an ISD inspection before it is issued and at every five-year renewal.
- Somerville caps unhosted nights at 90 a year and forbids adjacent units outright. Any pro-forma built on a Boston-style owner-adjacent unit collapses across the Somerville line.
- Cambridge still says 30 days, not 28. On June 23, 2025 the City Solicitor transmitted proposed amendments to § 4.60 that would cut the threshold to 28 days, formalize an "operator-occupied" category, require operators to hand over booking records on request, and add an explicit $300-per-violation-per-day fine. Those were proposals for adoption as a Council zoning petition — confirm current status with Cambridge before relying on either number.
Somerville also bars hourly rentals and stays under ten consecutive hours, prohibits commercial meetings, and applies its own three-violations-in-six-months rule: a third violation makes every residential unit in the dwelling ineligible for six months.
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08 — What this means if you operate here
Greater Boston is not a market for scaled short-term rental inventory, and no amount of structuring changes that. Chapter 9-14 has no investor license; Somerville has no adjacent-unit license; Cambridge has one, priced at $500 with an inspection attached. What survives is small: a resident owner with a spare bedroom, a resident owner's whole home, an owner-occupied two- or three-family in Boston, a resident tenant in Cambridge or Somerville. If you manage property for other people here, your product is operations for resident hosts, not a portfolio.
That work is still real work. A registered Boston host has to answer a 24-hour local-contact line with a two-hour in-person response standard, keep three years of records, and field the ordinary questions — heat, laundry, parking, the trash day the city changed — from guests who are often not writing in English. That is the part worth automating: Verto AI answers on WhatsApp around the clock in more than 25 languages, handles text, photos and voice notes, and resolves 85% of conversations on its own across more than 12,000 measured. It has no opinion on your license status, and it will not make an ineligible unit eligible.
The same lesson applies if you are comparing markets. New York took a different route to a similar destination — a registry, a host-present rule and a platform verification gate — and the numbers there are worth reading next to Boston's 963: see Local Law 18 and the OSE registry.
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