Plymouth County, MA Property Tax: File With Your City or Town (2026)

Direct answer

If you want to appeal a property tax assessment in Plymouth County, Massachusetts, you file with the Board of Assessors in your own city or town — Plymouth, Brockton, Kingston, Duxbury, or wherever the property sits — not with "Plymouth County." Unlike a handful of other Massachusetts counties, Plymouth County does still operate a functioning county government (elected County Commissioners, a Sheriff, a District Attorney, a Treasurer, a Registry of Deeds, and the Probate and Land Courts). But even in counties that kept their government intact, property assessment and abatements have never been a county function anywhere in Massachusetts — that job belongs entirely to the 351 individual cities and towns.

Plymouth County's government status — and why it doesn't touch your tax bill

Between 1997 and 2000, Massachusetts abolished county government in eight counties, including Middlesex, Worcester, Hampden, Hampshire, Essex, Suffolk, Franklin, and Berkshire. Plymouth County was not one of them. It still has elected County Commissioners, along with a Sheriff, District Attorney, Treasurer, Register of Deeds, and Register of Probate who serve the county's cities and towns (Plymouth and Brockton both serve as county seats). The Plymouth County District Attorney's office, for example, describes itself as serving "the Communities of Plymouth County" as a countywide law-enforcement office.

What Plymouth County's surviving government does not do is assess property or process tax abatements. Under Massachusetts General Laws Chapter 59, real estate is assessed "in the town where it lies" to the owner "on January 1" each year, and abatement applications go to that municipality's Board of Assessors. This has always been true statewide — it was true for Worcester County before its county government was abolished on July 1, 1998, and it is equally true for Plymouth County today even though the county government itself survived. The distinction is simple: Plymouth County government still exists, but it was never the body that set your assessment, and it still isn't.

How assessments work in Plymouth County municipalities

Every city and town in Plymouth County runs its own Assessing Department or Board of Assessors, sets its own annual tax rate, and mails its own bills. A few mechanics are set by state law and apply everywhere:

• Assessment date: Property is valued and taxes are assessed to whoever owns it as of January 1, under M.G.L. c. 59, §11.
• Quarterly billing: Most Massachusetts communities, including Plymouth County municipalities, bill quarterly. The first two quarters are preliminary estimates based on the prior year; the third-quarter bill is the "actual" bill reflecting the new fiscal year's assessed value and tax rate.
• Local rates: There is no single "Plymouth County" tax rate — each municipality sets its own. Brockton's Assessors Office lists a fiscal year 2026 residential tax rate of $11.63 per $1,000 of assessed value. Rates in smaller Plymouth County towns can be higher or lower depending on each town's budget and property values, so check your own town's assessors page for its current rate rather than assuming a countywide figure.

Whether you should file an abatement

An abatement is worth filing when you believe your property's assessed value is too high relative to its fair market value as of January 1, or when the property record contains an error (wrong square footage, incorrect number of bedrooms/baths, a condition issue not reflected in the record, etc.). Before filing, pull your property record card from your town's assessing office and compare it against recent, comparable sales in your neighborhood. If your assessment is clearly out of line with what similar homes actually sold for, or the record itself is wrong, an abatement application is the right next step. If the assessment is broadly in line with recent comparable sales, an appeal is unlikely to succeed.

Step-by-step how to file

1. Get your actual (third-quarter) tax bill. Your abatement window opens when this bill is issued, typically around January 1 for the fiscal year.
2. File with your city or town's Board of Assessors — not the county or the state. Every Plymouth County municipality has its own assessing office (for example, Plymouth's Board of Assessors sits at 26 Court Street, Plymouth, MA).
3. Meet the deadline. Under M.G.L. c. 59, §59, the abatement application is due on or before the last day for paying the first installment of the actual tax bill without interest — in practice, this generally falls on February 1 in Plymouth County's quarterly-billing communities (Plymouth's and Brockton's assessors both cite this rule). A postmark of the deadline date is generally accepted; there is normally no extension beyond that.
4. Cooperate with an inspection if requested. Some assessors require an interior/exterior inspection to process the application; Plymouth's assessors office notes this as a requirement.
5. Wait for a decision. Assessors generally have up to three months to act; if they neither grant nor deny, the application can be treated as deemed denied.
6. Appeal a denial to the Appellate Tax Board (or county commissioners) within three months. If your municipality denies the abatement (or doesn't respond), M.G.L. c. 59, §64 gives you three months from the decision — or from the deemed-denial date — to appeal to the state Appellate Tax Board, which was created under M.G.L. c. 58A. This is a state-level board, not a Plymouth County body.
7. Check exemptions separately. Massachusetts law provides statewide property tax exemptions for seniors (M.G.L. c. 59, §5, Clause 41 and related clauses), disabled veterans (Clause 22 and its sub-clauses), blind residents (Clause 37), and financial-hardship cases (Clause 18), all administered locally by your town's assessors, generally on an April 1 filing deadline separate from the abatement deadline.

Local tips

• Because Plymouth County government has no assessing role, calling "the county" about your bill will not help — go straight to your city or town's assessing department, whose contact information is on your tax bill.
• Rates and deadlines vary by municipality even within the county, so confirm your own town's current fiscal-year rate and exact abatement due date rather than relying on a neighboring town's numbers.
• If your town's actual tax bill hasn't gone out yet, don't wait to gather comparable-sales evidence — the filing window is short once the bill arrives, generally closing around February 1.
• Keep a copy of everything you submit and any inspection notes; you'll need the same documentation if you have to escalate to the Appellate Tax Board.