Boston property tax for Fiscal Year 2026 is charged at $12.40 per $1,000 of assessed value on residential property and $26.96 per $1,000 on commercial, industrial, and personal property.1City of Boston. Residential and Commercial Tax Rates History Bills go out quarterly, owner-occupants can shave up to $4,353.74 off through the residential exemption, and unpaid balances start collecting 14% interest the day after they’re due.
How Your Assessment Is Set
Every taxable property in Boston is valued at its full and fair cash value as of January 1 preceding the fiscal year. Boston’s fiscal year runs July 1 through June 30, so the FY2026 valuation date was January 1, 2025.2City of Boston Assessing Department. FY 2026 Assessing Calendar That snapshot date matters. A renovation finished in March won’t reach your tax bill until next fiscal year, and damage or demolition that happened before January 1 should already be reflected.
The Assessing Department builds valuations from recent comparable sales, construction cost data, and, for commercial buildings, income potential. Real property covers land and permanent structures.
The Two Rates and Why They Differ
Boston uses a split-rate system with two classes: Residential (Class 1) and Commercial, Industrial, and Personal Property (CIP). Massachusetts law lets a city shift the burden onto CIP so it pays up to 175% of what it would owe under a single uniform rate.3Mass.gov. Tax Classification Report Boston applies the full shift every year, which is why the commercial rate is roughly double the residential rate.
For FY2026:
- Residential: $12.40 per $1,000 of assessed value
- Commercial, Industrial, and Personal Property: $26.96 per $1,000 of assessed value
Commercial property makes up about a third of the city’s total taxable value but pays well over half the total levy. That shift is what keeps residential bills lower than they would otherwise be.1City of Boston. Residential and Commercial Tax Rates History
The Proposition 2½ Cap
Two state-law limits control how much Boston can collect. The total property tax levy cannot exceed 2.5% of the city’s total assessed value, and the levy cannot grow more than 2.5% over the prior year’s limit plus new growth from newly built or substantially improved parcels. When assessed values surge across the city, the rate per $1,000 must come down so the total levy stays within the cap. Your bill can still rise if your property appreciated faster than the citywide average, but the total pool of tax revenue is tightly constrained.
The Residential Exemption
If you own and live in your home as your primary residence, the residential exemption subtracts a fixed dollar amount from the assessed value before the rate is applied. For FY2026, that’s roughly $351,108 in taxable value removed, worth up to $4,353.74 in tax savings.4City of Boston. Residential Exemption On a home assessed at $800,000, you’d pay tax on about $448,892 instead of the full amount.
You must own and occupy the property on January 1 of the assessment year. The exemption is not automatic. You apply through the Assessing Department, and the city verifies residency using voter registration, vehicle registration, and other records. This isn’t an abatement; you’re not arguing the assessment is wrong, just claiming a statutory benefit for living in the home you own.
One consequence to know if you’re a landlord: the exemption effectively shifts a little more tax onto non-owner-occupied residential property, since the total levy stays the same while qualifying homeowners pay on a smaller base. A Boston rental unit you don’t live in gets no break.
Relief for Seniors, Veterans, and Other Qualifying Owners
Boston residents 65 or older who meet income and asset limits can receive up to $1,000 in property tax relief under Clause 41C, with the city authorized to grant an additional $1,000. For FY2026 the income caps are $25,980 for a single person and $38,970 for a married couple, including Social Security. Non-home assets can’t exceed $40,000 single or $55,000 married.5City of Boston. Elderly Exemption 41C The additional $1,000 won’t be granted if it would drop your FY2026 bill below your FY2025 bill or push taxable value under 10% of the assessed amount.
Separate statutory exemptions exist for blind persons, surviving spouses, and disabled veterans, each with its own eligibility rules. The application deadline for these exemptions is April 1, or three months after the third-quarter actual bill is mailed if that’s later.2City of Boston Assessing Department. FY 2026 Assessing Calendar
Deferral Instead of Exemption
Seniors who can’t cover their bill but don’t want to lose the home have another option. Under Clause 41A, an owner 65 or older who meets the income threshold can defer all or part of the property tax. The deferred amount accrues 4% interest and must be repaid when the property is sold, transferred, or on the owner’s death.6City of Boston. Tax Deferral 41A The state adjusts the income limit periodically, so confirm the current figure with the Assessing Department before applying.
When the Bills Are Due
Boston bills property tax quarterly. The first two quarters are preliminary estimates based on the prior year’s taxes; the second two are the actual bills for the current fiscal year:
- First quarter (preliminary): due August 1
- Second quarter (preliminary): due November 1
- Third quarter (actual): due February 1
- Fourth quarter (actual): due May 1
The third-quarter bill is the first one that shows the current fiscal year’s actual rate and assessed value. Any gap between what you paid in the preliminary quarters and what you actually owe gets split across the third and fourth quarters.2City of Boston Assessing Department. FY 2026 Assessing Calendar
You can pay online, by mail, or in person at the Collector-Treasurer’s Office. Payments count as received on the date the Collector gets them, not the postmark date. If your mortgage escrow pays the taxes, the bill goes to the lender, but you remain responsible if they miss a payment.
What Happens if You Pay Late
Interest starts accruing the day after the due date at 14% per year, a rate set by state law and not negotiable. After 30 days the Collector-Treasurer sends a demand notice and adds a $5 demand fee.7City of Boston. Problems With Real Estate Tax Bills On a $5,000 quarterly payment, even a few months of delay adds real money.
If the bill stays unpaid, the city places a tax lien covering the unpaid taxes, interest, and collection costs. A lien clouds your title and makes selling or refinancing difficult. Prolonged delinquency can escalate to a tax taking, the process that can end in loss of the property. Municipal property tax liens hold priority over most other claims, including federal tax liens, so there’s no way to route other creditors ahead of the city.
Challenging Your Assessment
If you think the Assessing Department overvalued your property, the formal remedy is an abatement application. You file after receiving the third-quarter actual bill, and the FY2026 deadline is February 2, 2026.8City of Boston. How to File For a Real Estate Tax Abatement You can only challenge the current fiscal year, not prior or future years.
Two rules trip people up. You must pay your full tax bill on time while the abatement is pending; withholding payment kills your appeal rights. And you carry the burden of proof, because the city’s valuation is presumed correct. Useful evidence is usually recent comparable sales, an independent appraisal, or documentation of conditions that lower value, such as structural problems, environmental issues, or adverse easements. The Assessing Department may send follow-up requests for information within 30 days of your filing. Ignore those and they’ll deny the application, potentially costing you the right to appeal further.
Appealing to the Appellate Tax Board
The Assessing Department has three months from your filing to act. If they deny the abatement or let the clock run out, you have three months from that point to appeal to the Massachusetts Appellate Tax Board.8City of Boston. How to File For a Real Estate Tax Abatement ATB proceedings are more formal, and for a property worth enough to justify the cost, a licensed appraiser’s report prepared to recognized professional standards strengthens the case considerably.