Massachusetts Property Tax Appeal Guide
Massachusetts municipalities assess property at 100% of full and fair cash (market) value as of the January 1 assessment date.
100%
Statutory percentage
February 1 (Appellate Tax Board) or 3 months from tax bill
Verified July 2026 — confirm on your notice
Mass. Gen. Laws ch. 59, § 59 (abatement applications)
Governing state code
How to File in Massachusetts
Review the assessed value on your third-quarter (actual) tax bill.
File an abatement application with the local Board of Assessors by February 1.
Provide comparable sales or an appraisal supporting a lower value.
Await the assessors' decision (deemed denied if not acted on in three months).
Appeal to the Massachusetts Appellate Tax Board within three months of the decision.
Deadlines and ratios vary by county and change over time — always confirm with your local assessor. This is general information, not legal advice.
Are you actually over-assessed in Massachusetts?
Check this property against recent comparable sales for $4.99. If the evidence says you have no case, you know that before you spend a filing deadline on it — and if it does, the same $4.99 is credited toward the full appeal packet.
A worked example in Massachusetts
Say the assessor values your home at $400,000, but comparable sales show it is really worth $350,000 — a $50,000 over-assessment. Massachusetts taxes the full market value, so the taxable amount drops by the same amount. At a typical effective rate of ~1.5%, that is about $750 back in your pocket every year until the value is corrected.
Illustration only. Your actual rate, exemptions, and savings depend on your county and taxing districts — run your own numbers.
Common grounds for a Massachusetts appeal
Over-market valuation. Comparable sales of similar nearby homes closed below the value the assessor placed on yours.
Errors in the property record. The county has the wrong square footage, bedroom or bathroom count, lot size, or condition on file.
Unequal (non-uniform) assessment. Comparable properties in your area are assessed for less than yours, regardless of market value.
Physical or external problems. Deferred maintenance, functional issues, or an external nuisance depress what a buyer would pay.
Overvaluation · Unequal assessment · Denial of exemption
Don’t overlook exemptions
An appeal lowers your value, but exemptions cut your taxable base directly — and both stack. Most owners qualify for a homestead exemption on their primary residence, and many states add relief for owners over 65, veterans, and people with disabilities. Confirm you are enrolled with your Massachusetts county assessor before filing — it is the fastest saving most people miss.
- Elderly Exemption (Clause 41A) Tax deferral available
- Age 65+, income and asset limits
- Veteran Exemption $400–full exemption
- Qualifying veterans
- Blind Exemption $500 assessed value
- Legally blind
- Senior Circuit Breaker Up to $2,590 state credit
- Age 65+, income limits
Who hears a Massachusetts appeal
Your appeal is decided by Board of Assessors / Appellate Tax Board — the value itself is set by the Board of Assessors, which is who you are disagreeing with.
- 1
Board of Assessors (abatement)
- 2
Appellate Tax Board
- 3
Superior Court
Each stage has its own deadline. Missing the first one usually closes the later ones for that tax year.
Key Massachusetts statutes
The sections a Massachusetts appeal is argued under. Quote one exactly as written — a paraphrased or renumbered citation is worse than none.
- G.L. c. 59 §38
- Assessment at Full and Fair Cash Value
- G.L. c. 59 §59
- Application for Abatement
- G.L. c. 58A §7
- Appellate Tax Board
- G.L. c. 59 §5
- Exemptions
- G.L. c. 59 §5C
- Elderly Exemption
Official Massachusetts resources
These are state government sites. The form and portal you actually file through are published by your county assessor.
Massachusetts property tax appeal questions
- When is the deadline to appeal property taxes in Massachusetts?
- February 1 (Appellate Tax Board) or 3 months from tax bill. Verified July 2026. Deadlines vary by county and change from year to year, so always confirm the date printed on your own assessment notice before you file.
- Who decides a property tax appeal in Massachusetts?
- Board of Assessors / Appellate Tax Board hears it. The full path is: Board of Assessors (abatement), then Appellate Tax Board, then Superior Court.
- What is the assessment ratio in Massachusetts?
- 100% of full and fair cash value. That is the share of value your bill is calculated on, so lowering the assessed value lowers the bill proportionally.
- What grounds can I appeal on in Massachusetts?
- Massachusetts recognises these grounds: Overvaluation, Unequal assessment, Denial of exemption. Overvaluation is the most common — you show comparable sales that closed below your assessed value.
- What property tax exemptions does Massachusetts offer?
- Elderly Exemption (Clause 41A) — Tax deferral available, for age 65+, income and asset limits; Veteran Exemption — $400–full exemption, for qualifying veterans; Blind Exemption — $500 assessed value, for legally blind; Senior Circuit Breaker — Up to $2,590 state credit, for age 65+, income limits. Exemptions reduce your taxable base directly and stack with an appeal, so check both.
- What is the average property tax rate in Massachusetts?
- About 1% of market value per year statewide. Your own rate depends on your county and its taxing districts, so treat this as a benchmark rather than your bill.
Massachusetts Tax Estimator
$0 / yr
Based on 100% ratio & avg. millage. Estimate only.
Generate your Massachusetts appeal packet
Check your property for $4.99 (credited), then get the full comparable-sales packet and AI appeal letter for a flat $29 — $19 at launch.