The property tax line on a Boston condo listing describes the person selling the unit as much as the unit itself. If the seller lives there as a principal residence, that number likely already reflects the City's residential exemption, which saved qualified homeowners up to $4,353.74 on their bills in fiscal year 2026, according to the City of Boston. The exemption doesn't transfer with the deed. Whether your first full bill matches the listing depends on how you'll use the unit and when you close.
That changes how you compare two condos on the same block with similar square footage and similar assessed values. One may have been owner-occupied and the other rented out, so their tax lines can differ by thousands of dollars a year. Those figures tell you about the past owners and very little about what you'll pay.
The Line on the Listing Reflects the Seller
Boston's residential exemption reduces a tax bill by "exempting a portion of your property value" for homeowners who occupy the property as their principal residence. The state statute behind it, M.G.L. c. 59, § 5C, names condominium units specifically and limits the benefit to the taxpayer's principal residence for income tax purposes. An individual can have only one principal residence and can claim the exemption on only one parcel in the city.
In practice, a second home doesn't qualify, and neither does a unit you plan to rent out, according to Boston's Assessing Department. The City also checks eligibility. It asks applicants for a Social Security number, which it uses only to confirm a tax filing from the property's address.
A Flat Credit on a Sliding Scale
The structure of the exemption matters more than its size. State law lets Boston exempt up to 35% of the average assessed value of all Class One residential parcels. Assessors take that one dollar figure off the assessed value of every qualifying home. A $500,000 one-bedroom and a $2 million penthouse get the same reduction in taxable value.
GBH reported the FY2026 residential rate of $12.40 per $1,000; at that rate, the $4,353.74 credit works out to roughly $351,000 of exempted value. The table below uses that FY2026 math to show what the flat credit does at different price points. These are illustrations built from the City's published rate and exemption amount, not bills for any specific unit.
| Assessed value, FY2026 | Annual bill, no exemption | Annual bill, owner-occupied | Effective rate, owner-occupied |
|---|---|---|---|
| $500,000 | $6,200 | about $1,846 | about 0.37% |
| $750,000 | $9,300 | about $4,946 | about 0.66% |
| $1,000,000 | $12,400 | about $8,046 | about 0.80% |
| $2,000,000 | $24,800 | about $20,446 | about 1.02% |
The credit makes Boston's effective tax rate climb with value for owner-occupants, while every non-qualifying unit pays the full rate at every price. In this illustration, a $500,000 condo held as a rental carries a bill more than three times what an owner-occupant would pay. At $2 million, the difference is about a fifth.
For a buyer comparing smaller units, that gap is the biggest single difference in carrying costs that the listing price doesn't show. It also changes the math of buying to live in now and renting out later. Once the owner moves out, the unit no longer meets the principal-residence test the exemption depends on.
Why the Gap Got Wider in FY2026
Boston can tax commercial property at a higher rate than residential property. State law caps the commercial side at 175% of the share it would carry under one flat rate, as WBUR reported. For FY2026, city officials said residential values rose about 2% while commercial values fell about 6%. With the commercial share already at its legal maximum, more of the levy moved onto homes.
In December 2025, the City Council approved the maximum commercial shift and the maximum 35% residential exemption. The residential rate still rose from $11.58 to $12.40 per $1,000, and the commercial rate was set at $26.96. Officials projected about a 13% increase, roughly $780, for the average single-family homeowner. First- and second-quarter bills are estimates based on the prior year, and the January bill carries the catch-up. WBUR reported that the 13% annual increase could feel like a 26% jump from one quarter to the next.
"As residential property owners are set to pay their highest share in property taxes in over 40 years, our legislation awaits state approval that would stabilize taxes, protect residents and help businesses continue to benefit from strong city services." That was Mayor Michelle Wu's statement after the December 2025 vote, as reported by GBH.
As more of the levy lands on residential property, the full rate that non-qualifying units pay goes up. The exemption is the main tool the City has left under current law to protect owner-occupants from that increase. Council Ways and Means Chair Brian Worrell said the December actions, together with the exemption, gave "the maximum amount of relief for homeowners under our current state laws."
The State House Hasn't Changed the Rules
The City's attempts to raise the commercial ceiling have been stuck at the State House since 2024. On January 15, 2026, the Massachusetts Senate rejected an amendment that mirrored Mayor Wu's tax-shift petition, 33–5. On the same day, it passed a separate "tax shock" bill 37–1. That bill would give municipalities a local option to offer targeted credits when residential levies rise more than 10%. Banker & Tradesman reported that supporters framed it as relief that leaves the state's existing property tax classification system unchanged. The legislature's bill history shows no House action on it since the Senate vote. In June 2026, the mayor said the Senate still hadn't touched her latest petition, according to State House News.
As of October 2026, no new law has changed how Boston sets its rates. The City says FY2027 tax rates will be set in December 2026. The third-quarter bill, issued in late December, is the first to show the year's actual value and rate. FY2027 assessments are based on values as of January 1, 2026. The FY2027 exemption amount hasn't been published, and the City's current materials still list $4,353.74 as last year's savings. Any FY2027 bill you work out today is an estimate based on FY2026 numbers.
The Calendar a Buyer Controls
The owner-occupancy test runs on fixed dates, so your closing date affects your first year of taxes. Here's how Boston's published FY2027 rules work:
- Owned and occupied on January 1, 2026. These homeowners qualify for FY2027 under the long-standing rule.
- Deed recorded and unit occupied between January 1 and June 30, 2026. A recent home rule petition expanded eligibility. Homeowners who recorded a deed at the Suffolk County Registry of Deeds and occupied the property as their principal residence in that window may qualify for FY2027.
- Closing between July 1 and December 31, 2026. These buyers fall outside the posted FY2027 window. The City's materials don't yet cover FY2028. In past years, eligibility for each fiscal year was set by ownership and occupancy on the preceding January 1.
- Filing. The City recommends applying by mid-October to see the credit on the third-quarter bill. The FY2027 deadline is April 1, 2027. Applications go to Assessing at City Hall, Room 301, and quarterly bills still have to be paid while an application is pending.
The City's own example shows why this matters. Someone who closed in May 2026 and moved in may qualify for FY2027. Someone who closed in August 2026 on a similar unit may pay the full rate on that unit for FY2027.
Questions for the Closing Table
Massachusetts purchase and sale agreements usually split the current fiscal year's taxes as of the closing date. If the actual amount isn't known yet, the split uses the prior year's taxes and is adjusted later. A closing rider published by the Real Estate Bar Association also specifies proration as of the closing date. Boston's materials don't say whether a seller's credit, already applied to the third-quarter bill, stays on that parcel's bill through June 30 after a sale. They also don't say how the credit should be handled in the proration. In the contract language we reviewed, it depends on the agreement. This isn't tax or legal advice, and it's worth raising with your closing attorney before you sign.
Before you make an offer, ask three questions about any Boston condo:
- Does the current tax bill include a residential exemption credit?
- What would the bill be at the full residential rate on the current assessment?
- Will your closing date and move-in date put you inside or outside the next eligibility window?
Common Questions
Does the exemption apply to condos or only to houses? The statute names condominium units specifically. A condo you own and occupy as your principal residence is treated the same as a single-family home.
Can I combine the residential exemption with other exemptions? Yes. Boston allows other exemptions to be combined with it, but taxable value generally can't fall below 10% of assessed value, with exceptions for certain residents facing physical ailments or financial hardship.
When will I know the FY2027 numbers? The City sets FY2027 rates in December 2026. The third-quarter bill, issued in late December, shows the actual rate and any exemption credit.
When you're comparing Boston condos, start by finding out what the tax line will look like with you as the owner, before you weigh one unit against another. Michael Quinn can help you work out the bill at the full rate, check how your closing date lines up with the exemption calendar, and coordinate with your attorney on proration. Schedule a private consultation before you submit your offer.
