Massachusetts property tax appeals
Review the sourced process overview below, then get the Massachusetts DIY Appeal Kit with an evidence workbook, filing controls, official links, and an editable appeal letter in one PDF. No parcel-specific comps.
How a Massachusetts appeal actually works
Every statement below is cited to its primary source and shows the date we verified it. Where we could not confirm something from a primary source, we say so instead of guessing. Dataset last re-verified 2026-08-13.
Missed the main deadline? Massachusetts has 8 remedies most homeowners never hear about
County pages rarely surface these. Each one is a distinct legal route with its own clock.
Residential Exemption (owner-occupied principal residence) — G.L. c.59 §5C
A LOCAL-OPTION exemption available only in cities/towns certified by the Commissioner as assessing at full and fair cash value and that have adopted it (adopted by selectboard/mayor with council approval). Equal to not more than 35% of the AVERAGE assessed value of all Class One residential parcels in the community, applied only to the taxpayer's principal residence as used for income tax purposes. It is in addition to c.59 §5 clause exemptions, but taxable valuation after all exemptions may not fall below 10% of full and fair cash value (except via clause Eighteenth). Available to cooperative corporation members for their proportionate share. Boston, for example, offers it. A taxpayer aggrieved by failure to receive it applies to the assessors on a Commissioner-approved form, and a timely §5C application is treated as a timely §59 application. THIS IS OFTEN A LARGER DOLLAR WIN THAN AN ABATEMENT and should be screened before or alongside any valuation appeal.
When:
primary source · verified
Statutory personal exemptions — G.L. c.59 §5 clauses (seniors, veterans, blind persons, surviving spouses, etc.)
Release or discharge from all or part of the local property tax based on the owner's status or the property's ownership/use. Enumerated clauses include Seventeenth, 17C, 17C½, 17D, Eighteenth, Twenty-second series (22, 22A–22F), Thirty-seventh, 37A, Forty-first series (41, 41B, 41C, 41C½), Forty-second, Forty-third, Fifty-second, Fifty-third, Fifty-sixth and Fifty-seventh. Claimed by filing an abatement/exemption application with the assessors; DLS publishes taxpayer guides for blind persons, qualifying senior citizens, surviving spouses/minor children/elderly persons, qualifying veterans, and religious/charitable organizations. Senior and hardship tax DEFERRALS are also available on the same timetable.
When:
primary source · verified
Petition for Late Entry (PLE) at the ATB — G.L. c.59 §65C
Where the taxpayer had a right of appeal because the assessors failed to ACT on the abatement application, but the assessors also failed to send the written notice of inaction within 10 days as required by G.L. c.59 §63 (or the notice of determination was defective), and by mistake or accident the taxpayer failed to enter the appeal in time, the ATB may — after notice and hearing, and on such terms as it imposes — allow the appeal to be entered late. This is a discretionary safety valve, not an entitlement, and it does NOT rescue a late-filed Level 1 abatement application.
When:
primary source · verified
Motion for relief from the payment prerequisite — G.L. c.59 §65B
A taxpayer who has appealed under §65, has paid at least one-half of the tax (or one-half of the amount deemed due under §64) without incurring interest, and cannot presently pay the balance, may move the ATB to excuse the payment requirement or extend the time to pay. If the Board finds the allegations true it may grant the motion on conditions; failure to comply with those conditions can result in dismissal.
When:
primary source · verified
Abatement of omitted, revised or reassessed taxes — G.L. c.59 §§75, 76, 77
Where the assessors add a tax after the annual commitment (omitted assessment), assess an additional amount for an underassessment (revised assessment), or amend the assessed owner (reassessment), the taxpayer gets a fresh, independent abatement window keyed to that supplemental bill rather than the annual bill.
When:
primary source · verified
Alternative appeal to County Commissioners — G.L. c.59 §64
In counties where county government has NOT been abolished, a taxpayer may file a complaint with the clerk of the county commissioners (or the board authorized to hear such complaints) instead of appealing to the ATB, on the same three-month timetable and subject to the same payment conditions. The assessors, city solicitor or town counsel may, within 30 days of receiving a certified copy of the complaint, elect to have it heard by the ATB instead, in which case the municipality bears the transfer/entry fee. NOT AVAILABLE for property in REVERE or WINTHROP. Most Massachusetts county governments have been abolished, so for the overwhelming majority of homeowners the ATB is the only Level 2 forum — do not surface this route in a consumer product without verifying that the specific county still has an operating commission.
When:
primary source · verified
ATB Mediation Program — G.L. c.58A §8A; 831 CMR 1.18
Either party may request mediation; both must agree. Confidential sessions conducted by ATB legal-department attorneys (never Board Members, so participation cannot prejudice the case). Jurisdiction must be established before mediation begins. A meaningful, low-cost settlement channel that avoids a hearing.
When:
primary source · verified
'8 of 58' discretionary abatement authority — G.L. c.58 §8
DOR may authorize assessors to abate taxes where they no longer have legal power to do so because the taxpayer missed the abatement deadline — used for uncollectible taxes, unenforceable assessments, and egregious assessment errors where the taxpayer shows substantial mitigating circumstances. EXPRESSLY NOT A TAXPAYER REMEDY: assessors are not required to request it, DOR is not required to grant it, and assessors need not exercise it if granted. Never present this to a homeowner as a fallback for a missed deadline.
When:
primary source · verified
What evidence wins in Massachusetts
PRIMARY THEORY IS OVERVALUATION under G.L. c.59 §59 ('an assessment of any of his property in excess of its fair cash value'). The ATB's official guide directs taxpayers to build the case on: (1) a detailed description of the subject (style, rooms, baths, living area, land area, amenities, setting, condition, age), supported by photographs, maps and plans; (2) review and correction of the assessors' property record card; (3) RECENT SALES OF COMPARABLE PROPERTIES, adjusted for property type, location (same street/neighborhood best), physical description, time relative to the January 1 valuation date, and condition — the ATB expressly requires adjustments, since no two properties are identical and sales rarely occur on the valuation date; (4) documentary support — photographs and property record cards of the comparables to establish similarity and confirm sale price. ASSESSMENT-BASED COMPARABLES ARE EXPRESSLY PERMITTED: the ATB guide states that 'If there are not many sales of comparable properties, or if you wish to further support your comparable-sales analysis, the assessed values of comparable properties may also help prove the fair cash value of the subject property,' with the same requirement of similarity plus adjustments. This is unusual and commercially important — MA permits a comparable-ASSESSMENT analysis as substantive proof of fair cash value, not merely as a uniformity argument. EXPERT EVIDENCE TRAP: if an appraisal report is offered but the appraiser is not produced for cross-examination, the report is hearsay and the Board CANNOT rely on the expert's opinion of value or on any of the expert's adjustments. EXCHANGE DEADLINE: any documentary evidence must be given to the ATB and the opposing party no later than SEVEN DAYS before the hearing (831 CMR 1.27(1)); appraisal reports must be exchanged at least 30 days before hearing if the Board so directs (G.L. c.58A §8A). DISPROPORTIONATE ASSESSMENT IS A SEPARATE AND MUCH HARDER CLAIM: it is a listed ground on State Tax Form 128 and in G.L. c.59 §59 ('taxed at more than his just proportion'), but DLS defines it as requiring that the property be 'valued at a higher percentage of fair cash value than other properties DUE TO AN INTENTIONAL, DISCRIMINATORY ASSESSMENT POLICY,' citing Shoppers' World, Inc. v. Board of Assessors of Framingham, 348 Mass. 366 (1965) and Brown v. Board of Assessors of Brookline, 43 Mass. App. Ct. 327 (1997). Scattered assessment error or an isolated high ratio is not enough — intentional, systematic discrimination must be shown. For a residential product, plead OVERVALUATION as the operative theory and use comparable assessments as valuation evidence; do not market a 'uniformity' claim as an easy win. Other grounds on Form 128: incorrect usage classification (only meaningful where the community has multiple tax rates) and statutory exemption.
primary source · verified 2026-08-12
The appeal ladder, in Massachusetts's own terms
- 1
Local Board of Assessors (city or town) — Application for Abatement
Deadline: On or before the due date of the FIRST INSTALLMENT of the ACTUAL tax bill for the fiscal year (the bill issued after the tax rate is set). Preliminary bills and revaluation 'proposed value' notices do NOT trigger abatement rights. In quarterly-billing communities the operative bill is the third-quarter actual bill and the deadline is usually FEBRUARY 1; if the actual bills are mailed after December 31, the deadline is MAY 1, or 30 days after the bills are mailed if that is later. In semi-annual-billing communities the first actual installment is usually due NOVEMBER 1, or 30 days after the bills are mailed if that is later. Separately, for omitted (G.L. c.59 §75), revised (§76) or reassessed (§77) taxes, the deadline is 3 months after the bill/notice was first sent. The abatement due date must be printed on the face of the tax bill (G.L. c.60 §3A); if the printed date is later than the statutory date, the printed date controls (unless the error is the wrong year). Mortgagees may apply only during the last 10 days of the period, and only if the assessed owner has not already applied.
Clock starts: Due date of the first installment of the ACTUAL (post-tax-rate) tax bill for the fiscal year — i.e., keyed to the mailing/issuance of the actual bill, not the preliminary bill
M.G.L. c.59 §59; billing due dates per M.G.L. c.59 §57 (semi-annual) and §57C (quarterly); bill content per M.G.L. c.60 §3A · primary source · verified 2026-08-12
Form: State Tax Form 128 — Application for Abatement of Real Property Tax / Personal Property Tax, Fiscal Year ____ (General Laws Chapter 59, § 59) official form
primary source · verified 2026-08-12
Fee: $0 — no filing fee for an abatement application to the assessors
M.G.L. c.59 §59 (no fee provision); DLS Assessment Administration Chapter 6, Property Tax Abatements Module (Rev. 01/26), §3.0, describes no application fee · primary source · verified 2026-08-12
- 2
Massachusetts Appellate Tax Board (ATB), 100 Cambridge Street, Suite 200, Boston, MA 02114
Deadline: Within THREE MONTHS after (a) the DATE OF THE ASSESSORS' DECISION on the abatement application, or (b) the date the application is DEEMED DENIED. Deemed denial occurs automatically if the assessors do not act within three CALENDAR months (not 90 days) of the date the application was filed — e.g., an application filed February 1 is deemed denied May 1. Critical: the three months runs from the DATE OF ACTION shown on the assessors' notice, not the date the notice was mailed. If the assessors fail to send the required notice of inaction within 10 days of a deemed denial (or their notice is defective) and the taxpayer therefore misses the deadline, a Petition for Late Entry may be filed within 2 months after the date the appeal was due (G.L. c.59 §65C). JURISDICTIONAL PAYMENT PREREQUISITE: for real estate where the tax due for the full fiscal year exceeds $5,000, every preliminary and actual installment must have been paid by its due date without incurring interest (or the 'deemed due' amount — the average tax, net of abatements, for the three preceding fiscal years — must have been so paid); if the full-year tax is $5,000 or less, no payment is required. For personal property, at least one-half of the tax must be paid. A taxpayer who has paid at least half without interest and cannot presently pay the balance may move for relief under G.L. c.59 §65B. Additional jurisdictional trap: failure to permit inspection or to furnish requested written information under oath within 30 days of an assessors' request under G.L. c.59 §61A bars the statutory appeal.
Clock starts: Date of the assessors' decision on the abatement application, OR the date of deemed denial (three calendar months after the application was filed with the assessors)
M.G.L. c.59 §§64, 65; deemed denial: M.G.L. c.59 §64 and M.G.L. c.58A §6; notice duty: M.G.L. c.59 §63; late entry: M.G.L. c.59 §65C; payment relief: M.G.L. c.59 §65B; discovery bar: M.G.L. c.59 §61A · primary source · verified 2026-08-12
Form: No numbered state tax form. Two ATB-supplied forms: 'Statement Under Informal Procedure — City and Town Assessors Appeals' (informal procedure, G.L. c.58A §7A) or 'Petition Under Formal Procedure — City and Town Assessors Appeals' (formal procedure, G.L. c.58A §7) — Statement Under Informal Procedure – City and Town Assessors Appeals / Petition Under Formal Procedure – City and Town Assessors Appeals official form
primary source · verified 2026-08-12
Fee: Entry fee scales with ASSESSED VALUE and is identical for the formal and informal procedures: assessed value $20,000 or less — $10; over $20,000 and not in excess of $100,000 — $50; over $100,000 and not in excess of $999,999 — $100; over $1,000,000 — $0.10 per $1,000 of assessed value, maximum fee $5,000. Separate: transfer by a municipality of an appeal from Informal to Formal Procedure — $65. (Commissioner of Revenue appeals, not applicable to local property tax: $0.10 per $100 of abatement requested, minimum $65, maximum $5,000; small claims $50.) Checks payable to 'The Appellate Tax Board'. One petition per parcel and per fiscal year unless the Board permits joinder, and the Board may require a separate entry fee for each parcel. (statutory)
M.G.L. c.58A §7 (entry fees set annually by the Commissioner of Administration under M.G.L. c.7 §3B); M.G.L. c.58A §7A (informal procedure minimum fee); 831 CMR 1.06(2), 1.08(3), 1.09(1) · primary source · verified 2026-08-12
- 3
Massachusetts Appeals Court (further review by the Supreme Judicial Court)
Deadline: Notice of appeal must be filed with the ATB within THIRTY DAYS of the date of the ATB decision. If a timely request for findings of fact and report is made (which must itself be filed within 10 days of the decision, formal procedure only), the date of promulgation of the findings of fact and report is the date of entry of judgment for purposes of the 30-day appeal period. AVAILABLE ONLY IF THE APPEAL WAS HEARD UNDER THE FORMAL PROCEDURE — under the informal procedure both parties waive all rights of appeal except on questions of law raised by the pleadings, by an agreed statement of facts, or shown by the report of the Board.
Clock starts: Date of the ATB decision (or, if timely requested, the date the ATB promulgates its findings of fact and report)
M.G.L. c.58A §13; Mass. R. App. P. 4(a); 831 CMR 1.34, 1.35; waiver under M.G.L. c.58A §7A · primary source · verified 2026-08-12
Not confirmed from a primary source: 831 CMR 1.35 and the ATB guide describe the claim of appeal procedurally but do not publish a numbered/titled ATB form; no Appeals Court form number was located on an official source within this research pass. Check the official page before relying on this.Not confirmed from a primary source: The Appeals Court entry fee was not verified from an official Appeals Court source within this research pass. Do not quote an amount to a customer. Check the official page before relying on this.
Who has to prove what
The taxpayer must affirmatively prove that the FAIR CASH VALUE of the property is LESS THAN its assessed value, measured as of JANUARY 1 preceding the fiscal year at issue (e.g., for FY2027, running July 1, 2026–June 30, 2027, the valuation date is January 1, 2026). Fair cash value is the price a willing seller would accept from a willing buyer in an arm's-length sale, neither under compulsion and each aware of all relevant facts (Boston Gas Co. v. Assessors of Boston, 334 Mass. 549 (1956)).
primary source · verified 2026-08-12
When values are set
ASSESSMENT IS ANNUAL. Local assessors in every Massachusetts city and town have a constitutional and statutory duty to assess ALL property at its full and fair cash value as of JANUARY 1 each year, and to classify all real property into one of four classes (residential, open space, commercial, industrial) as of that date. If prior-year values no longer reflect the market, assessors have a legal duty to reassess. CERTIFICATION IS EVERY FIVE YEARS: DOR's Bureau of Local Assessment reviews each municipality's overall assessing practices and certifies values once every five years (data quality review, statistical ratio study, and valuation review). DLS confirms a current five-year certification cycle and publishes the cycle year by community. In interim years, assessors must analyze market conditions and assessment level/uniformity annually as of January 1 and make interim valuation adjustments, reported to BLA. The valuation date that controls an appeal is January 1 preceding the fiscal year (fiscal year runs July 1–June 30).
primary source · verified 2026-08-12
How counties differ
Massachusetts appeals do NOT vary by county — they vary by MUNICIPALITY (351 cities and towns), driven by the billing cycle each community has adopted. County government has been abolished in most Massachusetts counties, so the county-commissioner route under G.L. c.59 §64 is largely vestigial and is statutorily unavailable for property in Revere and Winthrop. The variable that actually matters is the Level 1 abatement deadline: (1) QUARTERLY BILLING (G.L. c.59 §57C; bills generally due Aug 1, Nov 1, Feb 1, May 1) — the actual bill is the third-quarter bill and the abatement deadline is usually FEBRUARY 1; if the actual bills are mailed after December 31, the deadline moves to MAY 1, or 30 days after mailing if later. VERIFIED EXAMPLE: City of Boston states you may file only after the third-quarter tax bill and no later than FEBRUARY 1, 2027 for FY2027, and separately that residential and personal exemption applications for FY2027 are due APRIL 1, 2027. (2) SEMI-ANNUAL BILLING (G.L. c.59 §57) — the first actual installment is generally due NOVEMBER 1, or 30 days after the bills are mailed if later, and that date is the abatement deadline. (3) OMITTED/REVISED/REASSESSED bills — 3 months from mailing regardless of cycle. OPERATIONAL RULE FOR THE PRODUCT: never compute the deadline from the calendar. Tax bills are required by G.L. c.60 §3A to print the abatement application due date on the face of the bill, and if the printed date is LATER than the statutory date the printed date legally controls (unless the error is the wrong year). Read the date off the actual bill, and confirm with the assessor's office. Municipal deadlines also roll to the next day municipal offices are open when they fall on a Saturday, Sunday, legal holiday, or a day offices are closed for a weather-related or public-safety emergency.
Massachusetts appeal deadline
Deadlines varyMassachusetts deadlines are set locally.
The deadline is almost always printed on the assessment notice your local assessor mails you. Use that date, it is the one that counts.
Are you missing a Massachusetts exemption?
Exemptions cut your bill before any appeal even starts, and most homeowners never claim all the ones they qualify for. Answer four questions:
Is your Massachusetts home over-assessed?
The whole appeal hinges on one comparison: your assessed value (from your tax notice) versus your home's market value (what it would sell for today). Put both in:
How to find your home's real market value (free) →
- Pull free estimates. Look up your address on Zillow (“Zestimate”) and Redfin (“Redfin Estimate”). Average them, algorithms run high or low, so two beats one.
- Find 3-5 real comparable sales. Same neighborhood, similar size, beds/baths, age, and condition, sold in the last 6-12 months. Recent sales (not listings) are the strongest evidence a board will accept.
- Adjust for differences. Knock value off comps that are bigger or renovated; add for ones that are smaller or dated, so you're comparing like-for-like.
- Compare to your assessment. If your assessed value sits clearly above that adjusted market figure, you have grounds to appeal.
One catch: some states assess at a fraction of market value (an “assessment ratio”). If your notice shows a ratio or an “equalized” value, compare your implied full value to market, not the raw assessed number.
How property tax appeals generally work
Most states follow the same basic path: your local assessor mails an assessment notice with a value and a deadline; you file an appeal (often called a protest, grievance, or petition) before that deadline; you present comparable sales of similar homes; and a local board reviews the evidence and can lower your value.
The exact form, deadline, and board can vary by county. Use the current assessment notice and the official sources linked above to confirm the controlling local requirements. The paid kit organizes that verification, the evidence, the filing steps, and your editable letter in one place.
Want to see the depth we build per state? Take a look at our Texas, Florida, and Georgia guides.