Chelsea Property Tax: Rates, Residential Exemption, and CPA Surcharge

Chelsea property tax for fiscal year 2026 runs $11.48 per $1,000 of assessed value on residential parcels and $23.79 per $1,000 on commercial, industrial, and personal property, with a 1.5% Community Preservation Act surcharge added to nearly every bill.¹ Owner-occupants can knock a large chunk off the taxable value through the residential exemption, and lower-income and senior households can wipe out the CPA surcharge entirely. Both require an application, and the deadline is strict.

What You’ll Actually Pay

Chelsea runs a split tax rate, so homeowners pay less per $1,000 of value than businesses do. At the FY2026 residential rate of $11.48, a home assessed at $500,000 carries a base tax bill of roughly $5,740 before any exemption or surcharge.¹ The commercial and industrial rate of $23.79 is more than double the residential figure, which shifts more of the overall burden onto business property.

Your bill arrives quarterly. The residential exemption and any income-based CPA relief show up as credits on those bills rather than as a separate refund.

The Residential Exemption: The Biggest Break for Owner-Occupants

The largest single reduction available to a Chelsea homeowner is the residential exemption under Massachusetts General Laws Chapter 59, Section 5C. If you own and occupy your Chelsea property as your primary residence, the city removes a flat dollar amount from your assessed value before calculating tax. Chelsea has adopted the maximum allowed percentage, 35% of the average assessed value of all residential parcels citywide.²

In FY2025, that came to $264,995 subtracted from a qualifying homeowner’s assessed value, worth about $3,050 off the annual bill.³ The exact dollar figure changes each year with residential values, but the 35% has stayed put. The savings are split between the third-quarter (January) and fourth-quarter tax bills.

To qualify:

You must have owned and occupied the property as of January 1 of the prior year.
The property address must match the address on your Massachusetts state income tax return.
You can only claim the exemption on one parcel.

The exemption stacks with other statutory exemptions, but the combined reductions can’t drop your taxable value below 10% of the property’s full assessed value.²

Nothing about this is automatic. You have to apply. Miss the deadline and you lose the exemption for the whole fiscal year, with no retroactive fix.

The Community Preservation Act Surcharge

Chelsea adds a 1.5% Community Preservation Act surcharge to property tax bills under Massachusetts General Laws Chapter 44B, funding a dedicated account for historic preservation, open space, outdoor recreation, and affordable housing.⁴⁵

The surcharge applies to every property class, but the first $100,000 of each parcel’s assessed value is excluded.⁵ The 1.5% is applied to the property tax generated by the remaining value, not to the assessed value itself. For a $500,000 home at the FY2026 residential rate:

CPA-taxable value: $500,000 minus $100,000 = $400,000
Tax on that portion: $400,000 ÷ 1,000 × $11.48 = $4,592
CPA surcharge: 1.5% × $4,592 = about $69

The surcharge appears as a separate line item on your tax bill. Commercial properties, taxed at the higher rate, see a proportionally larger surcharge on the same assessed value.

Who Can Skip the CPA Surcharge

Chelsea has adopted the optional CPA exemption for low-income households and moderate-income seniors. Eligibility keys off the area median income published each year by HUD for the Boston-Cambridge-Newton metro area.⁶ Two groups qualify:

Low-income residents of any age with household income below 80% of area median.
Homeowners age 60 or older with household income below 100% of area median.

Thresholds shift each year and vary by household size. The Chelsea Assessor’s Office can confirm the current limits. You must own and occupy the home as your primary residence, and the exemption isn’t permanent. Reapply every year.

If you qualify, the entire CPA surcharge is waived for that fiscal year.

How to Apply, and the Deadline That Trips People Up

The residential exemption and the CPA income-based exemption are separate applications, both filed with the Chelsea Assessor’s Office. The FY2027 residential exemption application is due April 1, 2027.⁷ The CPA exemption follows the same deadline framework.⁶

For the residential exemption, bring proof you owned and occupied the property as of January 1 of the prior year. Your Massachusetts state tax return address is the main evidence of residency. For the CPA income exemption, you’ll need your most recent federal income tax return showing household gross income, proof of age for senior applicants, and documentation of everyone living in the home along with their individual incomes.

Drop off completed applications at the Assessor’s Office at Chelsea City Hall during business hours, email them, or mail them. If you mail, use certified mail so you have a record.⁸ The Board of Assessors verifies eligibility against ownership records and your income documentation, and approved amounts appear as credits on future tax bills.

One timing note. To see the reduction on your January (third-quarter) bill, file well before April 1. Past city guidance has suggested filing by October 1 of the prior year for that timing.⁸ File closer to the April deadline and you still get the full exemption, but the credit may not land until the fourth-quarter bill.

Deeds Excise When You Buy or Sell

Separate from your annual property tax, Massachusetts charges a one-time deeds excise when real estate changes hands, under Chapter 64D.⁹ Chelsea transfers are recorded at the Suffolk County Registry of Deeds, which collects the tax at recording.

The rate is $2.28 for every $500 of sale price (or fraction of $500), which comes to $4.56 per $1,000. A $600,000 sale generates $2,736 in excise. The seller customarily pays, though a purchase agreement can allocate costs differently, so review the closing disclosure. This is a closing cost, not a recurring charge, and it has no connection to the CPA surcharge or your annual bill.

Federal Deduction and the SALT Cap

If you itemize, Chelsea property tax (including the CPA surcharge) is generally deductible on your federal return as state and local tax. The IRS allows deductions for real property taxes levied uniformly for the general public welfare, which the CPA surcharge is, since it applies at the same rate to all property in Chelsea.¹⁰

The ceiling is the SALT cap. For tax year 2026, it’s $40,000 for most filers and $20,000 for married filing separately, rising 1% a year through 2030. If your modified adjusted gross income exceeds $500,000, the cap phases down. Between Massachusetts income tax and Chelsea property tax, many homeowners hit the cap before deducting everything they paid.

The deeds excise isn’t deductible as a property tax, but sellers can use it to reduce their gain when computing capital gains on the sale.

What Changes to Your Tax Bill Do to Your Mortgage Payment

If you escrow taxes through your mortgage, any change to your Chelsea tax bill flows into your monthly payment eventually. Federal rules require your servicer to run an annual escrow analysis, comparing what it collected against what it disbursed.¹¹

A shortage (escrow didn’t cover a higher tax bill) means either a higher monthly payment going forward or an option to pay the gap in a lump sum. A surplus (perhaps because you newly qualified for the residential exemption) triggers a refund if it exceeds $50, or a credit against future payments. You’ll get an annual escrow statement within 30 days of the end of your escrow computation year explaining the adjustment.¹¹

So qualifying for or losing a Chelsea exemption doesn’t only change your tax bill. It changes your mortgage payment too, usually a few months later. Budget with that lag in mind, especially the first year you claim the residential exemption.

1
City of Chelsea. Assessor
2
General Court of Massachusetts. Massachusetts General Laws Chapter 59 Section 5C
3
City of Chelsea. Residential Exemption Information for FY 2026
4
City of Chelsea. Community Preservation Committee
5
General Court of Massachusetts. Massachusetts General Laws Chapter 44B – Community Preservation
6
General Court of Massachusetts. Massachusetts General Laws Chapter 44B Section 3
7
City of Chelsea. Taxpayer Forms
8
City of Chelsea. FY25 Residential Exemption
9
General Court of Massachusetts. Massachusetts General Laws Chapter 64D – Excise On Deeds, Instruments And Writings
10
Internal Revenue Service. Topic no. 503, Deductible Taxes
11
Consumer Financial Protection Bureau. Escrow Accounts