The Tax Bill on a Boston Listing Belongs to the Seller. Here's Why Yours Will Differ.

Two Boston condos can carry the same assessed value and still show annual taxes thousands of dollars apart on their listings. Nothing about the buildings causes that gap. It comes from who owned each unit on January 1, 2026. That date matters even more for anyone closing between now and the end of the year, because the FY27 residential exemption window for new buyers has already closed.

Boston's fiscal year 2027 runs from July 1, 2026, to June 30, 2027, and assessments for it reflect property values as of January 1, 2026. So the tax figure on a listing is built from three things: the seller's exemption status, sales from a year that has already ended, and how closely the city's assessments track sale prices at that home's price point. A fall 2026 buyer inherits none of those conditions the way the seller had them.

The exemption window closed on June 30

Boston's residential exemption takes part of an owner-occupied home's value off the tax rolls. According to the City of Boston's residential exemption page, it saved qualified homeowners up to $4,353.74 last fiscal year.

A recent home rule petition widened who qualifies. Owners who held and lived in their home on January 1, 2026 still qualify for FY27. Buyers who recorded a deed at the Suffolk County Registry of Deeds and moved in as their principal residence between January 1 and June 30, 2026 may now qualify too.

A buyer closing in October, November or December 2026 falls outside both groups for FY27. The bill doesn't move to the new owner's name either. The City's tax payment guidance says real estate taxes attach to the property and the bill carries the name of whoever owned it on January 1 before the fiscal year starts. A buyer who receives that bill is still responsible for making sure it gets paid.

One assessment, two tax lines

Here is what that exemption is worth at a typical Boston price. The City's FY27 revenue analysis puts the citywide median single-family price at $800,000 in 2024. The FY26 residential rate is $12.40 per $1,000 of value, and it stays the most recent official rate until FY27 rates are set.

That's an illustration using last year's maximum exemption, not a projection for FY27. It shows why a lower tax line on a listing usually tells you the seller lived there. It says much less about whether the home is a better value. When the seller was an owner-occupant, the listed figure is the lower one. When the unit was a rental, the listed figure is already the full rate.

A buyer who plans to live in the home will see that difference go the other way over time. Once they qualify, their bill can drop below what the previous investor owner paid. A buyer of an owner-occupied unit should expect a period, possibly the rest of FY27, when the exemption the seller had doesn't apply to them.

The assessment trails the market by a full year

The exemption is one gap. The assessed value it's applied to has a gap of its own.

At an October 8, 2026 City Council hearing, interim Assessing Commissioner Hinlan Wong explained that annual assessments use only sales from the prior calendar year. As the Boston Herald reported, the city used 2024 sales to set FY26 assessments. So the number on a listing this fall comes from a market that is already one to two years old.

The rate applied to that number is still unknown. The City says FY27 tax rates will be set in December 2026. The first and second quarter bills are estimates based on the prior year's value, and the actual rate first appears on the third quarter bill.

The forces behind that December rate haven't gone away. CommonWealth Beacon explains that state law caps the commercial rate at 175% of what the overall rate would be if all property were taxed at the same rate. As office values fall and home values keep rising, that puts more upward pressure on residential taxes. The City's revenue analysis cites Jones Lang LaSalle data putting citywide office vacancy at 23.6% in the third quarter of 2025, roughly double pre-pandemic rates. In FY26, that shift contributed to a 13% increase in the average single-family bill, about $780, which WBUR reported when the Council set rates last December.

Relief from the State House hasn't arrived. On January 15, 2026, the Massachusetts Senate rejected Mayor Michelle Wu's proposal for a temporarily higher commercial shift by a vote of 33 to 5, WBUR reported. As GBH reported, senators passed a separate bill 37 to 1 that would let municipalities offer credits to qualifying households in years when residential taxes rise more than 10%. The legislative record for S.2917 lists only Senate actions from that day and no House vote.

For a buyer, the lagged assessment and the unset rate together mean the listing's tax figure is a floor to plan around, not a prediction.

Price tier decides how far behind it runs

The lag doesn't hit every home equally, and that's what the October hearing was about.

Councilor Miniard Culpepper, who sponsored the hearing order, pointed to high-end sales well above their assessments. The Herald reported that 59 Commonwealth Ave. in Back Bay sold for $21 million in November 2025 while assessed at $12.5 million, and that 46 Chestnut St. on Beacon Hill sold for $22 million in February 2026 against a $5.26 million assessment. The same hearing order cited a Roslindale single-family home that sold for about $430,000 and was assessed at $489,000, roughly 114% of its sale price.

Wong told the Council, according to the Herald:

"It's always difficult for us to try to reach into those high-value properties because it is an outlier, and our responsibility is to look at the pattern and the forest, not just one individual tree."

Chris Lehman of the Small Property Owners Association presented a broader pattern at the same hearing. His group's analysis found Boston single-family homes at the low end of the sale price range assessed at 99% to 105% of their same-year sale prices on average. High-end homes came in at 68% to 80%. The hearing order opened a fact-finding inquiry. It doesn't change assessment policy.

This matters when comparing neighborhoods. Under that analysis, a buyer in an entry-level price range is likely looking at a tax line close to full value already, so the main open question is the December rate. A buyer at the top of the market may see an assessment well below the purchase price, and a sale at that price becomes part of the data future assessments draw on. In both cases, the listing's tax figure compares homes less reliably than it seems to.

The dates between now and April

The City lists overvaluation, disproportionate assessment, improper classification and eligibility for a statutory exemption as grounds for an abatement. Its filing instructions explain mail and in-person options. The City's guidance doesn't directly say whether someone who bought after January 1 can file for FY27, so new owners should ask the Taxpayer Referral and Assistance Center at 617-635-4287 before the February deadline.

All of this is general information, not legal, tax or financial advice. Confirm your own eligibility and deadlines with Boston Assessing, your closing attorney or a tax professional.

Quick answers

Will my FY27 bill be higher than what the listing shows? It could be. FY27 rates won't be set until December 2026, and a buyer who doesn't qualify for the exemption pays without the discount an owner-occupant seller may have had.

The bill came in the previous owner's name. Do I still owe it? Boston says taxes attach to the property, so the new owner needs to make sure the bill is paid whoever's name is on it.

Can I claim the residential exemption in FY27 if I close this fall? The expanded FY27 window covers deeds recorded and homes occupied between January 1 and June 30, 2026. A fall closing falls after that.

If you're comparing Boston homes this season, have us rebuild each listing's tax line for your situation: exemption status, assessment versus price, and the December rate yet to come. Zander Realty Group will put those numbers side by side before you write an offer. Get an Estimate.