Boston Property Tax Increase 2026: The Subsidy Is Shrinking

There is a line on your Boston property tax bill that does not appear anywhere on your Boston property tax bill.

It is worth roughly $2,000 a year to the average single-family owner in this city. It is paid by office towers, lab buildings, and retail blocks most homeowners will never set foot in. Across the city it adds up to about $797 million a year that commercial property owners cover so residential owners do not have to.

That arrangement is the entire reason Boston has a reputation for low property taxes. It is also the reason the bill that landed on January 1 was 13 percent higher than the one before it. The buildings funding the subsidy are worth less every year, and Beacon Hill has now declined three separate times to do anything about it. On September 1 the two senators who blocked it face primary challengers the mayor personally endorsed.

I am not writing this as a political post. I am writing it because I keep seeing buyers underwrite Boston purchases with a flat tax line, and sellers get ambushed at the walkthrough by a number they never mentioned. Both are avoidable.

What actually landed on the January bill

Boston’s FY2026 residential tax rate is $12.40 per $1,000 of assessed value, up from $11.58. The commercial rate went to $26.96 from $25.96. The City Council approved those rates in December 2025, after it became clear the Legislature was not going to act.

For the average single-family homeowner that worked out to a 13 percent increase, about $780 for the year. Because Boston bills quarterly and the rate is not certified until midway through the fiscal year, the whole increase got crammed into the last two bills of the cycle, the January and April bills. That is why it felt worse than 13 percent to a lot of people. The January bill did not carry one quarter of the increase. It carried half of it.

This was the second consecutive double-digit increase. That detail matters more than the size of either one.

The line item that is not on your bill

Massachusetts lets cities tax commercial property at a higher rate than residential, up to a ceiling. Boston runs that ceiling at the maximum the state allows, a 175 percent classification shift, and has for years.

The result is a gap between what commercial property is worth and what it pays.

Layer the residential exemption on top of that. Boston knocks a flat amount off the assessed value of any home the owner actually lives in, worth up to $4,353.74 off the FY2026 bill. At the $12.40 rate that is about $351,000 of assessed value erased before the math starts.

Stack the two together and you get Boston’s headline number. An effective rate of 0.51 percent on owner-occupied homes, fifth lowest among 53 major American cities per the Lincoln Institute’s 50-state study. That number is real. It is also doing an enormous amount of quiet work, and almost every agent who quotes it leaves off the asterisk.

Why the subsidy is shrinking

A subsidy funded by commercial property only works while commercial property is worth something.

Boston’s commercial assessed value fell $2.3 billion in FY2026, after falling $1.9 billion the year before. The Boston Policy Institute points out that this two-year slide is already worse than what the city went through in the financial crisis, and worse in an unusual way. In 2008 the big drop came first and then the decline flattened. This time year two was larger than year one, which is not what the bottom of a cycle looks like.

The forward projection is the part buyers should sit with. Boston Policy Institute and Tufts’ Center for State Policy Analysis project office assessed values falling 35 to 45 percent through 2029, roughly $1.7 billion in lost property tax revenue, with the annual hole widening from about $135 million to more than $550 million by 2029.

More than a third of Boston’s budget comes from commercial property tax. For most American cities that figure is around 11 percent. Boston built an unusually good deal for homeowners on an unusually narrow base.

The vacancy numbers, and why the trackers disagree

Vacancy is where this story usually gets sloppy, including in conversations I have with other agents. The brokerages that publish quarterly numbers do not define the market the same way, so you can find a defensible Boston office vacancy figure anywhere from 19 percent to 24 percent depending on whose report you picked up.

You will also see a 40 percent lab vacancy number circulating. That traces back to a Boston proper availability figure from late 2025, and availability counts space being marketed that is not empty yet. It is not the current vacancy rate, and repeating it as though it were makes the argument easier to dismiss.

Here is the honest read, and it cuts slightly against the alarmist version. Both markets stopped getting worse in 2026. Boston office posted positive net absorption two quarters running, the first back to back gains since 2019. Lab is stabilizing off a bad bottom.

That does not rescue the tax base, and this is the piece I want buyers to understand. Assessments follow sale prices and income, and those already reset. A tower that leases up at rents 30 percent below its 2019 pro forma is a functioning building with a permanently lower assessed value. The levy damage is already done and it is still working its way through the assessment cycle. Vacancy flattening out does not undo it.

What died on Beacon Hill, three times now

The politics here are worth getting right, because the popular version is wrong in both directions.

Mayor Wu’s tax shift has failed three times. The City Council and the House passed two different versions in 2024 and both died in the Senate. She refiled in 2025 as HD 4422. The House sent it to the Revenue Committee in March, the Senate never agreed to the referral, and without that agreement the bill cannot even be assigned a number or scheduled for a hearing. It is not that the Senate voted it down. The Senate never let it become a bill.

Then in January 2026, Senator Michael Rush filed an amendment mirroring the plan during a tax relief debate. It failed 5 to 33 after about half an hour of debate. Senator Will Brownsberger voted against it, arguing it would set a precedent by carving exceptions into Proposition 2½. Senator Nick Collins has been the other consistent obstacle.

The Senate did pass alternatives. Brownsberger’s own bill cleared 37 to 1 and lets a city offer credits to vulnerable homeowners when residential bills jump more than 10 percent in a year, funded locally. Collins moved a measure letting cities issue rebates to homeowners who take the residential exemption, and in July he pitched using Boston’s surplus to pay for it. Wu called that disconnected from the facts and said reserves are for crises. Both of those alternatives are relief valves. Neither changes the classification math that produced the 13 percent.

Wu endorsed Daniel Lander against Brownsberger and Latoya Gayle against Collins. Those primaries are September 1.

My read is that the underlying arithmetic is not really in dispute and the fight is about precedent. The senators are not arguing that Boston homeowners got a small bill. They are arguing that suspending Proposition 2½ for one city is a door you cannot close. That is a defensible position, and it means a buyer should not underwrite on the assumption that relief is coming. Three failures and a contested primary is not a policy you can put in a spreadsheet.

The Brookline and Newton comparison almost everyone gets wrong

Now the part that changed my own thinking while I was running the numbers for this piece.

The standard line, and I have said a version of it myself, is that Boston homeowners pay dramatically less than the suburbs on a comparable home. On a statewide average that holds up. The Globe opinion piece that prompted this post puts suburban homeowners at roughly 60 percent more than Boston at the same home value.

But Brookline and Newton are not the average suburb. They are two of the lowest rate municipalities in Massachusetts, because they have enormous, valuable tax bases. And Brookline offers a residential exemption that is slightly larger than Boston’s.

• Boston: $12.40 per $1,000, residential exemption worth up to $4,354
• Brookline: $10.24 per $1,000, residential exemption deducting $354,974 of value, worth about $3,635
• Newton: $9.69 per $1,000, no residential exemption

Run an owner-occupied bill at the same assessed value in all three and the reputation does not survive contact.

Three things fall out of that table.

Brookline beats Boston at every realistic price point. Lower rate, marginally bigger exemption. A Brookline owner-occupant at the same assessed value pays less than a Boston one, full stop.

Boston’s edge over Newton is real but it expires. Because Boston’s exemption is a flat dollar amount, its value shrinks as a share of the bill as the house gets more expensive. The two cities cross at an assessed value of about $1,606,000. Above that, an owner-occupant pays more in Boston than in Newton.

If you are not living in it, Boston is the most expensive of the three. No residential exemption means no cushion, and Boston’s rate is the highest of the three by a wide margin. On an $875,000 assessed value the investor bill is $10,850 in Boston, $8,960 in Brookline, $8,479 in Newton. Every Dorchester and Hyde Park investor buying a three-family should be running that line, because the 0.51 percent talking point has nothing to do with them.

One caveat I want to be straight about. This compares tax structure at an identical assessed value. Assessed values lag the market, so a home that just closed is often assessed below what it sold for, and the bill resets upward over the following cycles. That lag helps a buyer for a year or two and then goes away.

What that looks like on homes that actually sold this spring

Structure is one thing. What people actually buy is another. I pulled every closed sale in our MLS between February 20 and August 20, 2026 to get the real medians rather than a portal estimate.

Boston single-family homes closed at a median of $875,000 across 433 sales. Newton single-families closed at $2,050,000 across 294 sales. Brookline single-families closed at $2,525,000 across 69 sales. So the tax bill an actual Newton buyer pays is not 31 percent above an actual Boston buyer’s. It is roughly three times as much, because the house costs two and a half times as much.

That is the real answer to the cross-shopping question, and it has almost nothing to do with tax policy. Inside the city the spread is just as wide:

A Roslindale buyer and a Newton Highlands buyer are about $1,250 a month apart on the tax line alone. That is a bigger swing than most of the rate shopping I watch people do.

If you are buying, stress-test the tax line

Every lender quote you get holds property tax flat. Two straight double-digit years and a shrinking commercial base say you should not.

Take the Roslindale median at $740,000. An owner-occupied bill runs about $4,822 a year today. Here is what five years of continued increases does to it.

An extra $245 a month is real money against a debt-to-income ratio, and it arrives after you have already closed. Three things I tell buyers to do:

• Underwrite at a 6 to 8 percent annual tax increase rather than zero. If the deal only works flat, it is a thinner deal than it looks.
• Confirm the residential exemption is actually filed. It is not automatic. You apply, and you have to have recorded your deed at the Suffolk County Registry. I have seen buyers lose the full $4,353 in year one by assuming it carried over from the seller.
• Ask what the current assessment is versus your purchase price. A wide gap means a reassessment is coming. Our buyer closing cost calculator handles the day-one numbers, but the year-three number is the one that bites.

If you are selling, put the number on the table first

If your Boston home got reassessed upward this cycle, a buyer’s agent is going to find that. The question is whether they find it from you in week one or at the walkthrough in week six.

I would rather be straight about it early. When we list a Boston property now, we put the actual current tax bill, the residential exemption status, and last year’s increase into the listing materials on purpose. It costs a little at first impression. It costs much less than a renegotiation eight days before closing, and it removes the one piece of ammunition a buyer’s agent can otherwise spring on you.

Sellers in West Roxbury, Roslindale, and East Boston should pay particular attention, because those are the areas where values ran hardest and reassessments followed. If you are working out what a sale actually nets you, the seller’s net proceeds calculator is the place to start, and a current home value estimate will tell you how far your assessment has drifted from the market.

What I am watching between now and the next bill

Four things, in order of how much they matter to a transaction.

The September 1 primaries. If Lander and Gayle both lose, the tax shift is finished as a live idea and Boston homeowners should plan around the current formula indefinitely. If either wins, the Senate math changes and a fourth attempt becomes plausible in the next session.

The FY2027 assessment roll this fall. This is the real tell. A third straight commercial decline would mean a third double-digit residential increase, and at that point two data points become a trend that belongs in every buyer’s underwriting.

Whether Collins’s rebate bill clears the House. It has passed the Senate twice. It does not fix the structure, but it would put money back in the pockets of owner-occupants who take the residential exemption, and it is the only relief with a real path right now.

Office leasing through year end. Two quarters of positive absorption is a start. Four would mean assessed values find a floor sooner than the 2029 projection assumes.

None of this means Boston is a bad buy. Boston still delivers the lowest owner-occupied tax bill of any comparable purchase in the region, and the residential exemption is a genuinely valuable benefit that plenty of buyers fail to claim. What has changed is that the cushion is thinner and directional. Buy accordingly, price accordingly, and stop quoting 0.51 percent without the asterisk.

If you are weighing a Boston purchase against Brookline or Newton and want the tax line run on the specific properties you are considering rather than a citywide average, reach out and I will put the numbers together. It takes about twenty minutes and it occasionally changes which town people end up in.

Sources

• Boston Globe opinion, “Wu took on two senators over property taxes. New data say they were right.” August 10, 2026
• Boston Globe, “Property taxes on Boston single-family homes set to spike 13 percent,” December 3, 2025
• GBH News, “Boston City Council approves increased tax rates after legislative action stalls,” December 11, 2025
• NBC10 Boston, “Boston property tax shift plan stuck in neutral on Beacon Hill,” December 8, 2025
• Boston Globe, “Mass. Senate votes down Boston Mayor Michelle Wu’s property tax proposal,” January 15, 2026
• WBUR, “Amid reelection fight, Southie state senator pitches rival property tax proposal,” July 24, 2026
• WBUR, “Report: Boston could lose $1.7 billion in tax revenue due to empty offices,” June 5, 2025
• Boston Policy Institute, “5 Questions about Boston’s 2026 property taxes,” December 7, 2025
• City of Boston Assessing Department, residential exemption
• Town of Brookline, FY2026 residential exemption
• JLL, Boston Office Market Dynamics, Q2 2026
• Lincoln Property Company, Boston/Cambridge/Suburbs Lab Report, Q2 2026
• Hunneman, Mid-Year 2026 Boston Life Science Report
• Lincoln Institute of Land Policy, 50-State Property Tax Comparison Study
• MLS PIN closed sales, February 20 to August 20, 2026, queried directly by BMN Boston