Why your assessment probably isn't what your home is worth, and how to translate between the two.
Look up almost any property in New York and you'll find more than one dollar figure attached to it, and they rarely agree. A house that would sell for $300,000 can carry an assessment of $300,000 in one town and $81,000 in the next, depending only on where the town line falls. None of those numbers is wrong. New York lets every city and town choose the level it assesses at, and the state publishes a rate for each one so that the numbers can be translated back into market terms. Once you know how that works, the figures on an assessment record make sense.
An assessor's job starts with market value. For homes, vacant land and farms, that usually means the market approach: comparing the property with similar ones that have recently sold. Apartment buildings and other rental property are often valued by the income they could produce, and industrial and utility property by what it would cost to rebuild, less depreciation, plus the land. Most assessors also use computer models to value many properties at once from local sales.
The assessment is then that market value times the municipality's level of assessment. The state's own example: a property worth $100,000, in a city that assesses at 27% of market value, is assessed at $27,000.
Most states require every municipality to assess at the same level. New York doesn't: each city and town sets its own, and many have drifted far from 100%. The usual reason is time. When a town does a full reassessment, its assessments line up with market value; as years pass without another one, market values move and the assessments don't, so the level of assessment wanders away from 100%. The state's rule of thumb is that the lower a town's rate, the longer it has probably been since its last reassessment.
Because every town is on a different scale, raw assessments can't be compared across town lines, and that matters for taxes. Most of the state's 700-plus school districts, and most counties, spread their tax levy over several municipalities with different levels of assessment. If the levy were split by raw assessed value, a town assessing at 33% would pay far less than its fair share next to one assessing at 50%. Something has to put them on the same footing first.
That something is the equalization rate: New York State's measure of a municipality's level of assessment, published each year for every city, town and assessing village. It's defined as:
total assessed value of the municipality ÷ total market value of the municipality = equalization rate
Rates are expressed as percentages. A rate of 100 means property overall is assessed at full market value, which usually means a reassessment was done recently. A rate of 43 means property overall is assessed at 43% of market value. A rate above 100 means assessments are higher than market value overall — typically because values have fallen since the last reassessment and assessments weren't brought down with them.
Assessment rolls also print the town's own stated level, usually labeled the "uniform percentage of value." The state checks that figure and, where it holds up, uses it as the equalization rate; where it can't confirm it, the state uses its own estimate of the town's total market value instead.
One important limit: an equalization rate describes a whole municipality. It doesn't correct an individual assessment that's out of line with the rest of the town — that's what the grievance process is for.
Turned around, the definition gives you the conversion for any single property:
assessed value ÷ equalization rate = full market value
Use the rate as a decimal (27 becomes 0.27). A worked example:
A house in a town with an equalization rate of 27 has a total assessment of $81,000, of which $13,500 is land.
Full market value: $81,000 ÷ 0.27 = $300,000
Land at market value: $13,500 ÷ 0.27 = $50,000
Going the other way, a $300,000 house in the same town would be assessed at about $300,000 × 0.27 = $81,000.
The same arithmetic works for checking your own assessment: divide it by your town's rate, and compare the result with what you think the property would sell for. If the result is clearly higher, you may be over-assessed.
You'll also run into the residential assessment ratio, or RAR. Where the equalization rate covers all property in a municipality, the RAR measures the level of assessment for residential property only. It's the figure homeowners can use when grieving an assessment, before a Board of Assessment Review or in a small claims assessment review. When a town assesses homes and commercial property at noticeably different levels, the two numbers differ, and the RAR is the one that speaks specifically to homes.
Full market value is the closest thing on an assessment record to "what it's worth," but it's still an estimate, and it can be well off what a property would actually sell for today:
Treat it as a sensible starting point, not an appraisal.
When you click a property on the map, the panel shows all three of these figures, straight from the state's assessment data:
For example, 629 Huntersland Rd in the town of Berne, which assesses at 38% of market value, shows a land assessment of $19,000, a total assessment of $149,500 and a full market value of $393,421 — that is, $149,500 ÷ 0.38. Where a municipality files no full market value, the panel shows the assessments only; divide the total by the town's equalization rate to get it yourself.
Look up a property's values →The state publishes current equalization rates and RARs in the Municipal Profiles section of the Office of Real Property Tax Services' Municipal Data Portal. Choose County Equalization Rate Information, pick your county, and you'll get the current rate for every town, city and village in it; choose a municipality to see its rates from previous years. Your assessor's office can also tell you, and the roll itself lists the uniform percentage of value.
The definitions and rules above come from the New York State Department of Taxation and Finance: How property is assessed, Equalization rates, Residential assessment ratios, Finding equalization rates and RARs, Assessment rolls, and Completing the grievance form. Checked against those pages in October 2026.
This guide is general information, not legal or tax advice. Equalization rates and assessment practices change from year to year and differ by municipality; confirm the figures for your property with your assessor.