Every January, the New York City Department of Finance mails a Notice of Property Value, and every January a certain number of homeowners look at the “market value” printed on it — often up sharply from last year — and reach for the grievance form. The appeal-service mailers arrive on the same schedule: we’ll fight your assessment, you pay only if we win. But in New York City, most Class 1 homeowners who file a market-value grievance are pushing against a number that, by law, their tax bill barely tracks. The assessment that drives your bill isn’t your home’s market value. It’s a capped figure that’s usually running years behind it.
That single quirk of New York State law explains why the house down the block that sold last year can pay thousands more in tax than an identical house whose owner has held it for two decades — and why the honest first question before you appeal in NYC isn’t “is my home worth less than they say,” but “is my assessment even allowed to move if I win?”
Market value, assessed value, and effective market value are three different figures. A grievance touches the first; your bill is built on the second; the third tells you whether the appeal has anything to push against.
Almost every confused conversation about a NYC property tax bill comes from collapsing three distinct numbers into one. Pull out your notice and separate them.
| Number | What it is | Where it comes from |
|---|---|---|
| Market value | The city’s estimate of what your home is worth. This is what a grievance disputes. | For Class 1, a statistical model of comparable sales in your neighborhood over the prior three years — a mass-appraisal estimate, not an individual appraisal. |
| Assessed value | The number your tax bill is actually computed on (assessed value × tax rate, after exemptions). | In theory 6% of market value — but held down by the state-law cap on how fast it can rise. |
| Effective market value | Your assessed value divided by 6%. The market value your capped assessment implies. | Reverse-engineered from your assessed value. When your assessment is lagging, this sits well below the market value the city printed. |
The assessment ratio for Class 1 is 6%: the city’s starting point is that your assessed value should equal 6% of its market-value estimate. If that were the whole story, a market-value grievance would flow straight to your bill — cut the market value, cut the assessed value by 6% of the difference. In most of the country, that is roughly how it works. In New York City, a second state law gets in the way.
State law caps Class 1 assessment increases at 6% a year and 20% over five years. In a rising market, the assessed value never catches up — so it isn’t tracking today’s market, and disputing today’s market value doesn’t move it.
Under Real Property Tax Law §1805, the assessor “shall not increase the assessment of any individual parcel classified in class one… by more than six percent” in a year, or “more than twenty percent in any five-year period.” That protection exists to stop a hot market from doubling a longtime owner’s tax overnight. But it has a side effect the appeal mailers never mention: in any neighborhood appreciating faster than about 6% a year, the assessed value falls further behind the market every year and spends its life climbing toward a target it can’t reach.
The Department of Finance says so in its own words. On the page explaining how it sets your assessed value, it warns that “even when your market value has gone down, your assessed value continues to go up” — because your capped assessed value is still below the 6% target and is catching up to it. Read that twice: the city is telling you the number your bill is built on can rise in a year your home loses value. That is only possible because the assessed value isn’t set by this year’s market at all. It’s set by the cap’s slow climb.
What this does to a grievance. A market-value appeal argues: “My home is worth less than the city says.” Suppose you win, and the city drops its market-value estimate from $1,000,000 to $850,000. The 6% target falls from $60,000 to $51,000. But if your capped assessed value is only $42,000 — because it’s been lagging for years — it’s still below the new $51,000 target. It keeps climbing, at the same capped pace, toward a slightly lower ceiling. This year’s bill doesn’t change. You won the argument and the number that matters didn’t move.
This is the structural reason the classic property-tax grievance underperforms in New York City, and it’s the piece a contingency firm has no incentive to explain. A firm that earns a percentage of “savings” still has every reason to file — but if there are no first-year savings to be had, the homeowner has done the work, or paid for it, for nothing. New York’s three regional appeal systems all have quirks like this; we mapped how NYC, Long Island, and upstate run on entirely different rules and fee structures, and the cap is the one that trips up the most city homeowners.
A grievance moves your bill when your assessment is not capped-and-lagging — or when the city’s data is simply wrong.
The cap is a shield, and like any shield it only protects you while you’re behind it. Three situations put your assessment out in front of the market, where a successful appeal drops straight to your bill.
Notice what the winning cases have in common: they’re about whether the city’s number is genuinely too high relative to reality, not merely high in the abstract. The single best piece of evidence that it is — especially in the first case — is a recent arm’s-length sale of your own home below the city’s estimate. If you bought last year for less than the market value on your notice, that sale is the cleanest comparable there is; we cover how assessors weigh a recent purchase price as appeal evidence and when it carries the day. For the data-error case, the fix often isn’t a grievance at all — it’s a correction, and there’s a separate, simpler path for property-record errors.
Even when a grievance can’t cut this year’s bill, lowering the city’s market value lowers the ceiling your assessment is climbing toward — smaller increases, for years.
“It won’t lower your bill” and “it’s pointless” are not the same claim, and it would be dishonest to collapse them. Go back to the example: your capped assessment is $42,000, climbing 6% a year toward a $60,000 target. Win a grievance that cuts the target to $51,000, and your assessment now climbs toward $51,000 instead. This year looks identical. But next year, and the year after, your assessment rises toward a lower ceiling — and eventually plateaus $9,000 of assessed value lower than it otherwise would have. Multiplied by the tax rate and compounded across the years you own the home, that is real money. It’s simply slow, invisible, and impossible to bill a contingency fee against — which is exactly why you’ll never see it in a sales pitch.
The Desk’s View
The predatory edge of the contingency model isn’t that firms lie — it’s that they’re paid to file, and you’re the only party who benefits from knowing when filing is futile. In a jurisdiction where the assessment cap routinely holds homes below market, “file a grievance every year” is advice that serves the filer more reliably than the homeowner. The five-minute check below tells you which side of the cap you’re on. Do it first. It costs nothing, and it’s the one number no one selling you an appeal will run for you.
Compute your effective market value (assessed value ÷ 6%) and compare it to what your home would actually sell for. That comparison, not the scary market-value figure on the notice, tells you whether an appeal has anything to grieve.
Read three lines off your Notice of Property Value, do one division, and make one honest comparison.
If your real goal is simply a lower bill and you’re a senior, a veteran, or a longtime owner-occupant, the higher-value move is usually an exemption — STAR, Enhanced STAR, SCHE, or the veterans’ exemption — not a value grievance. Exemptions reduce the taxable portion of your assessment directly and don’t depend on winning any argument about value. They’re a different lever entirely, and worth claiming before you weigh an appeal.
Value disputes and factual errors run through two different doors, and the value door slams shut on March 15.
New York City splits the two problems onto separate tracks:
The Tax Commission may resolve a Class 1 case with a written offer of reduction rather than a live hearing, and you can ask to have your application decided on the papers you submit. If you accept an offer, that’s the end of the road. If you decline it, an owner-occupied one-, two-, or three-family home can take the next step to Small Claims Assessment Review (SCARP), a simplified court proceeding — a low-cost path that doesn’t require a lawyer. Before you weigh hiring anyone on contingency for any of this, it’s worth running the actual math on what a percentage-of-savings fee costs you against a filing you can often make yourself.
Not necessarily, and this is the confusion the cap creates. Your bill is built on your assessed value, which can rise no more than 6% in a year regardless of what the market-value estimate did. A double-digit jump in the printed market value is alarming but often doesn’t translate into a matching bill increase — it usually just widens the gap the cap is holding open.
No. New York City’s cap runs with the parcel, not the owner — there’s no acquisition-value reset on sale. That’s why a recently sold home and a long-held one on the same block can carry very different assessments and very different bills, and why buying a long-held home doesn’t hand you a fresh, market-tracking assessment.
Three reasons, in order of strength: your assessment isn’t capped (new construction, renovation, or an expired abatement); the city’s record contains a factual error; or your effective market value is above a realistic sale price. Absent one of those, the honest answer is often that you shouldn’t — or should file only for the smaller, forward-looking benefit of trimming the ceiling.
No. Co-ops and condos are Tax Class 2, valued as if they were income-producing rental buildings under a different set of rules, with different forms and a different deadline. This guidance is specific to Class 1 — one-, two-, and three-family homes.