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Massachusetts has a disproportionate assessment ground alongside the market value one.
The law and the data both work here. You can argue either from sales or from what comparable properties are assessed at. Limited mainly by size and by town-by-town administration.
So Massachusetts gives you a ground that runs on published assessed values rather than on sale prices. You're not showing what your house would sell for. You're showing that homes genuinely like yours are assessed lower than yours is, using numbers the county already publishes.
Now that matters more than it sounds, because it means a state keeping sale prices private doesn't stop you. Illinois, Texas, New York, New Jersey, Pennsylvania, New Hampshire, Kansas, Massachusetts and DC all have some version of it, and honestly it's usually the stronger argument even where sale prices are public.
February 1 in most municipalities, needs re-checking We have flagged this one to re-verify, so check it against your own notice or your county's site before you rely on it.
Miss it and you generally wait a year, so honestly the date matters more than the paperwork does.
And wherever you are, the single most useful thing you can actually do today is go find your assessment notice and read the date printed on it. That's what starts your clock, it's usually a much shorter window than people expect, and there's no getting it back once it's gone.
First, look up your own record. Your city or town board of assessors sets your value, and most post it online. Massachusetts towns revalue every year, so a lower value really does reach your bill.
Next, know where to file. You apply for an abatement with your town's board of assessors on State Tax Form 128. It's due when the first installment of your actual tax bill is due, which is ordinarily February 1 in towns that bill quarterly. The deadline can't be extended for any reason. If the assessors turn you down, the next step is the state Appellate Tax Board.
Then bring the evidence that wins here. You can argue from sales of genuinely similar homes, or from what comparable homes in town are assessed at. Assessors' records are public, so the second one's often pretty easy to put together.
Also, check your exemptions. Ask your assessors whether your town offers the residential exemption, which some cities like Boston and Cambridge do, and whether you qualify for one of the senior exemptions.
We only turn a state on once we've read its appeal rules and its actual board decisions, because that's how we make sure what we tell you is right and not generic. It takes a few days per state, and honestly it's the reason our answers are worth anything.
In the meantime our free check runs in parts of Illinois, Washington, Ohio, Georgia, Colorado, North Carolina and Oregon, and in every town in New Jersey. If you leave your email on the check page, we'll write to you the day Massachusetts goes live, and we won't email you before that.
We've screened all fifty states and DC on the same two questions. Does winning a lower market value actually lower your bill, or is there a cap sitting in between? And can you even put the evidence together from public records?
This comes from our own fifty-state screen, where we checked each state's cap, whether sale prices are public, whether there's an argument based on assessed values, and how many appeals actually get filed. Where we've quoted an appeal count, it's from the state or county that published it. If you spot an error, please write to hello@propertytaxbuddy.com and we'll correct it and say what changed.