Two buyers close on identical Boston condos one day apart. The first records the deed on June 30 and moves in. The second records on July 1. Under the City's current rules, the first buyer may qualify for the residential exemption for the fiscal year that is just starting. The second buyer generally waits until the fiscal year that begins a full twelve months later. In FY2026, the exemption cut up to $4,353.74 from a qualifying owner-occupant's bill.
Two rules decide when a Boston buyer's exemption starts. The first is a January 1 snapshot that most of Massachusetts uses. The second is a newer June 30 cutoff that Boston added. Brookline, next door, uses only the snapshot.
The June 30 line, and why Boston has one
Massachusetts runs property tax on a fiscal year from July 1 to June 30. Each year's assessment date is the January 1 before that fiscal year starts. The state law behind the residential exemption, M.G.L. c. 59, §5C, lets a city exempt up to 35% of the average residential value from tax. That exemption goes only to a taxpayer's income-tax principal residence, and a condo unit counts as a parcel.
Under the standard rule, you have to own and live in the home on January 1 to qualify for the next fiscal year. Boston added a second door. The City's residential exemption page says a recent home rule petition expanded eligibility. For FY2027, that means homeowners who recorded a deed at the Suffolk County Registry of Deeds and occupied the home as their principal residence between January 1 and June 30, 2026, may be eligible. Homeowners who already owned and occupied on January 1 still qualify as before.
Here is how that plays out by closing date:
| When you recorded the deed and moved in | First fiscal year you may be eligible | Basis |
|---|---|---|
| On or before January 1, 2026 | FY2027, July 1, 2026 to June 30, 2027 | January 1 snapshot |
| January 1 to June 30, 2026 | FY2027 | Boston's home rule expansion |
| July 1, 2026 or later, including this fall | Generally FY2028, if it is your principal residence by January 1, 2027 | January 1 snapshot, applied to the next fiscal year |
The last row is our reading of how the January 1 rule and Boston's June 30 window fit together. The City doesn't publish it as a separate statement. In practice, a buyer who closes in October 2026 is outside the window for FY2027. For that buyer, the first exemption-eligible year starts on July 1, 2027.
What the tax line on a listing is really showing you
The tax figure on a Boston listing belongs to the current owner. If the seller lives in the unit and gets the exemption, the bill reflects it. If the unit is a rental owned by an investor, the bill is the full amount. Two units with the same assessed value can show tax figures more than $4,000 apart, and nothing about the units themselves explains the gap.
Here is what that looks like with Boston's FY2026 numbers. The residential rate was $12.40 per $1,000 of assessed value. A $4,353.74 saving at that rate works out to about $351,108 of exempt value. On a condo assessed at $1 million, our math gives these FY2026 bills, before any other exemptions:
- Non-owner-occupied or investor-held: $12,400
- Owner-occupant with the full exemption: about $8,046
- Difference: $4,353.74
The City's own FY2027 residential exemption flyer explains the method with a simpler example. If the exemption value were $100,000, a $300,000 home would be taxed on $200,000. The flyer also says no parcel can be assessed at less than 10% of its fair cash value. That floor can limit how much of the exemption a lower-value property actually gets.
So when you're comparing an investor-owned unit with an owner-occupied one, the higher tax line may simply reflect who owns it today. And if you buy the owner-occupied unit this fall, its lower bill reflects the seller's eligibility. Your own eligibility starts on the schedule in the table above.
Why Brookline's number looks smaller, and isn't the same deal
Brookline also offers a residential exemption. The Select Board adopts it each year. To qualify, an owner has to occupy the home as their principal residence on January 1 before the fiscal year. The Town doesn't describe a spring window like Boston's.
The exempt values in the two places are close. The rates are not, and that changes how much the exemption is worth:
| Boston, FY2026 | Brookline, FY2026 | |
|---|---|---|
| Residential tax rate per $1,000 | $12.40 | $10.24 |
| Exempt value | About $351,108, derived from the City's savings figure | $354,974 |
| Annual savings | Up to $4,353.74 | $3,635 in the Town's example |
| Eligibility snapshot | January 1, plus January 1 to June 30 purchases | January 1 |
The Brookline Assessor's FY2026 guide uses a $950,000 home as its example. The estimated tax is $9,728 without the exemption and $6,093 with it. Boston's exempt value is about $4,000 lower, yet its saving is roughly $720 larger, because the saving equals the exempt value times the rate. A higher residential rate makes the same exemption worth more. That also makes timing more valuable in Boston. Missing a year of eligibility there costs more than missing a year in Brookline.
Brookline buyers face one more factor in FY2027. Voters approved a Proposition 2½ override on May 5, 2026, Brookline.News reported. The Town estimates the override will add about $0.30 per $1,000. That is a projection, not a certified rate.
Why the line is likely to matter more, not less
The exemption's dollar value rises and falls with the residential rate, and the residential rate in Boston has been under upward pressure. The City Council set FY2026 rates in December 2025, keeping a 35% residential exemption and the maximum shift of the levy toward commercial property, with rates of $12.40 residential and $26.96 commercial per $1,000, as GBH reported. For those 2026 bills, the Boston Globe reported an expected average increase of about 13%, or roughly $780, for single-family homeowners. In the same period, the average high-end office building was projected to see its bill fall.
Mayor Wu's plan to temporarily shift more of the burden back to commercial property did not pass. On January 15, 2026, the State Senate rejected the Wu-style amendment 33 to 5, and then passed a separate statewide bill, according to NBC Boston. WBUR reported on January 28, 2026, that the proposal had failed for this session.
FY2027 figures aren't out yet. Boston's FY2027 budget page lists a budgeted net levy of $3.61 billion, but its published rates are still the FY2026 numbers. The new fiscal-year rate shows up on the third-quarter bill, which usually goes out in late December. Until then, the $4,353.74 figure is last year's exemption, not a forecast for this year.
The paperwork that catches new owners
Knowing the dates is only half of it. The application has its own requirements:
- Tax filing check. The City asks for your Social Security number, which it uses only to confirm a tax filing from the property's address. For FY2027, the flyer specifies a 2025 Massachusetts personal income tax return filed from the address. The City's materials don't explain how this works for someone who bought between January and June 2026 and couldn't have filed a 2025 return from the new address. If that's you, the Taxpayer Referral and Assistance Center at 617-635-4287 is the place to ask.
- Trust ownership. If the property is held in a trust, the application needs a copy of the trust and a notarized schedule of beneficiaries.
- Timing of the credit. To have the exemption show up on the third-quarter bill, the City recommends applying by mid-October. Paper forms are available at the Assessing Department in Room 301 of City Hall and at TRAC on the mezzanine level. Online applications open through Boston Property Lookup after the December bills go out.
- Payment while you wait. The FY2027 deadline is April 1, 2027. Quarterly bills still have to be paid in full while an application is pending. If it's approved, the Collector-Treasurer issues a credit later in the fiscal year.
- Review and appeal. TRAC has three months to decide an application. A denial can be appealed to the Appellate Tax Board within three months. The City also reviews exemptions periodically, and owners who don't respond to requests for documentation lose the exemption.
A few quick answers
I closed this fall. Is there anything to file for FY2027? Under the City's published rules, eligibility for FY2027 depends on owning and occupying on January 1, 2026, or on a deed recorded and occupancy started between January 1 and June 30, 2026. A fall 2026 closing falls outside both.
Does the exemption follow the unit or the owner? It's tied to an owner using the property as their principal residence, and a person can claim it on only one parcel in the City.
Will FY2027 savings be $4,353.74 again? That hasn't been announced. The City labels that figure as last fiscal year's savings, and FY2027 rates are normally set in December.
If you're planning a Boston purchase for next spring, the recording date is worth settling alongside the price, the inspection, and the financing timeline. If you're selling, it helps to know how your own exemption shows up on the tax line buyers will see. Eileen Strong O'Boy can walk you through how the timing lines up with your move. If you're thinking of selling first, you can start by requesting a home valuation.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
