Cooperative apartment property tax in New York: how it works

Last updated 2026-07-11

Why don't co-op owners get their own property tax bill?

Because you don't own real property. When you buy a co-op apartment in New York, you buy shares in a corporation that owns the building. The deed to the land and the structure stays with the corporation. New York City's Department of Finance and every county assessor outside the city assess the building as one parcel and send one tax bill to the co-op corporation, not to individual shareholders. ^[1]

That's the core difference from a condo. A condo owner holds a deed to a specific unit, so the assessor creates a separate tax lot for it and mails a bill straight to the owner. A co-op owner holds a proprietary lease and a share certificate. No deed, no separate lot, no individual tax bill.

The board then divides that total property tax among shareholders, usually in proportion to the number of shares each apartment carries, and folds it into the monthly maintenance fee. You pay property tax every month. You just can't see it broken out on a government bill. Most co-ops disclose the number in their annual financial statements, and some show it in the monthly maintenance breakdown.

How does New York City assess a co-op building?

New York City sorts property into four tax classes. Co-op buildings with more than ten units land in Class 2, alongside rental apartment buildings. ^[2] The Department of Finance values Class 2 properties using the income approach: it estimates what the building would produce as a rental, applies a capitalization rate, and arrives at a market value. That market value then drives the assessed value.

Here's the wrinkle that makes co-op taxation feel strange. New York State Real Property Tax Law section 581 requires that a cooperative apartment be assessed as if it were a rental property, not at its actual sale price. ^[3] So even if the co-op sells units for $1 million each, the building gets valued as though tenants rented those apartments at market rent, then capitalized into a building value. That usually produces a lower assessed value than the combined market value of the units.

City assessors also apply the Class 2 assessment ratio, which is 45% of estimated market value. That 45% figure is the assessed value, and the tax rate is then applied to it. For fiscal year 2024-2025, the Class 2 tax rate in New York City was 12.267%. ^[2]

A rough calculation. Take a 20-unit co-op the city estimates has a market value of $8 million. It gets assessed at $3.6 million (45% of $8M). At a 12.267% rate, the annual tax bill runs roughly $441,600, or about $22,000 per unit on average before any exemptions.

New York City also caps how fast assessed values can rise. Class 2 assessed values cannot increase more than 8% in a single year or more than 30% over five consecutive years under Real Property Tax Law section 1805. ^[3] That cap has kept many long-established co-ops assessed well below what a fresh income-approach calculation would produce.

How does the co-op pass property taxes to shareholders?

The monthly maintenance charge bundles building operating costs, the underlying mortgage payment if there is one, and property taxes. Property taxes usually run 30% to 50% of a co-op's total maintenance expense, though the range swings hard with building age, location, and any exemptions the building carries.

Shares get allocated when the co-op converts or is first organized, and they're meant to track the relative value of each apartment. A two-bedroom with a terrace carries more shares than a studio. Each shareholder's property tax contribution is their share count divided by total shares outstanding, multiplied by the building's total tax bill.

Shareholders can find the building's actual property tax bill through the NYC Department of Finance by searching the building's borough, block, and lot number (the BBL). ^[4] The annual Notice of Property Value, sent to the co-op corporation each January, shows the tentative assessed value for the coming tax year. Some boards share it with shareholders. Many don't unless someone asks.

Want to know how much of your maintenance is property tax? Ask the board for the most recent audited financial statements. Most co-ops have to give these to shareholders every year. The tax expense sits as a line item in the income statement.

Can a co-op board appeal the property tax assessment?

Yes, and this is where co-op shareholders have real power. The co-op corporation, acting through its board, has full standing to file a tax certiorari proceeding to challenge the assessed value. ^[5] That's the formal term for a property tax appeal in New York.

For New York City co-ops, the process runs in two stages. First, the board can file an administrative appeal with the NYC Tax Commission between January 15 and March 1 of each year (the exact deadline can shift, so verify the current date on the Tax Commission's site). ^[6] The Tax Commission reviews the income and expense data, weighs comparable rental properties, and can cut the assessment without any court involvement.

If the Tax Commission's offer is too small or gets denied, the co-op can file a Small Claims Assessment Review (SCAR) petition or a full Article 7 proceeding in New York State Supreme Court. SCAR is limited to one- to three-unit properties, so most co-op buildings use Article 7. Article 7 cases can drag on for years and almost always need a real estate attorney and a certified appraiser. This is expensive. But for a large building, even a 5% cut in assessed value can save six figures a year.

The annual window to file with the NYC Tax Commission is January 15 to March 1. Miss it and you wait another full year. Many co-op boards hire a tax certiorari firm that works on contingency, taking 25% to 33% of the first year's savings as its fee. That's standard practice for this kind of work and often makes sense at the building level, given how much litigation costs.

What personal exemptions can individual co-op shareholders claim?

This is the part most shareholders miss. Even though the building pays the tax bill, New York law lets individual shareholders apply for exemptions that reduce the assessed value tied to their proportionate share. The co-op receives the benefit, and the board is supposed to pass the savings to the qualifying shareholder through a maintenance reduction. ^[7]

The main exemptions available to co-op shareholders in New York City:

Exemption	Who Qualifies	Benefit	Where to Apply
STAR (Basic)	Primary residence, income under $500,000 (statewide limit)	Reduces assessed value by ~$30,000 (NYC estimate)	NYS Tax Department (now a rebate check, not a bill reduction for most)
Enhanced STAR	Age 65+, income under $107,300 (2024, indexed annually)	Larger assessed value reduction	NYS Tax Department
Senior Citizen Exemption (SCHE)	Age 65+, income under $58,399 (NYC, 2024)	Up to 50% reduction in assessed value	NYC Dept. of Finance
Disabled Homeowners' Exemption (DHE)	Disabled, income under $58,399 (NYC, 2024)	Up to 50% reduction	NYC Dept. of Finance
Veterans Exemption	Qualifying veterans	Partial reduction	NYC Dept. of Finance

^[7][8]

For STAR, most shareholders who registered after 2015 get a check directly from the state instead of a bill reduction. For SCHE and DHE, the exemption cuts the co-op's tax bill and the board must pass the savings to the qualifying shareholder as a maintenance credit. New York Real Property Tax Law section 467 governs the senior exemption and explicitly covers cooperatives. ^[3]

Deadlines matter. SCHE and DHE applications in New York City are due March 15 for the following tax year. Enhanced STAR runs through the state Tax Department, with no fixed annual deadline for renewals, but new registrations should go in as early as possible. ^[8]

If you think you qualify and your board hasn't filed, or hasn't passed the savings to you, that's a governance issue worth raising in writing.

How does co-op taxation work outside New York City?

The same basic structure applies statewide under New York Real Property Tax Law, but the class systems, rates, and assessment ratios vary by municipality. Nassau County, Westchester County, and other suburban counties each keep their own assessment rolls, equalization rates, and appeal procedures.

In Nassau County, the assessor values co-op buildings and the county runs its own grievance process through the Assessment Review Commission. The grievance filing deadline in Nassau is usually the third Tuesday in May. ^[9] In Westchester, the assessment roll is handled at the town level, and grievance day falls on the fourth Tuesday in May in most towns, though you need to confirm with the specific town assessor.

Equalization rates matter outside the city. When a municipality assesses at less than full market value, the state publishes an equalization rate (the ratio of assessed value to market value), and that rate factors into how taxes and exemptions get calculated. The NYS Office of Real Property Tax Services publishes these rates every year. ^[10]

Shareholders in co-ops outside NYC should ask the board which municipality assesses the building, what the current equalization rate is, and when the annual grievance deadline lands. All of it is public record.

Is a co-op taxed differently than a condo in New York?

Yes, in ways that can favor co-op owners quite a bit. Condos in New York City are Class 2 properties if they have more than three units, and they're supposed to be assessed the same way as co-ops under the rental income approach. In practice, condo assessments have often come in lower than co-op assessments on a per-unit basis, partly because the income approach is harder to benchmark for a building of individually owned units.

The bigger structural difference: condo owners get individual tax bills and can file their own assessment challenges through SCAR (for one- to three-unit buildings) or through the NYC Tax Commission and Article 7 for other condos. Co-op shareholders have no individual standing. Only the board can appeal. ^[5]

Tax abatements work differently too. The Cooperative and Condominium Tax Abatement (the co-op/condo abatement) cuts the tax bills for qualifying buildings by 17.5% to 28.1% depending on the assessed value per unit, applied directly to the tax bill rather than the assessed value. ^[11] This is separate from exemptions and goes to the building, which must pass the savings to shareholders.

For a full comparison of how NYC structures its property taxes across classes, the NYC property tax overview has the rate table and class definitions for the current fiscal year.

What is the cooperative and condominium tax abatement and does your building qualify?

The Cooperative and Condominium Tax Abatement is one of the biggest tax benefits available to co-op buildings in New York, and plenty of shareholders don't know it exists or whether their building is getting it. ^[11]

To qualify, the unit has to be the shareholder's primary residence. Buildings that get 421-a or J-51 tax benefits are generally shut out. The abatement percentages for tax year 2024-2025:

Assessed Value Per Unit	Abatement Percentage
Up to $50,000	28.1%
$50,001 to $55,000	25.2%
$55,001 to $60,000	22.5%
Over $60,000	17.5%

^[11]

The building's managing agent files an abatement application with the NYC Department of Finance. This is an annual or periodic filing. If the board or managing agent doesn't file, the building loses the benefit, and individual shareholders have no direct way to claim it.

The benefit flows as a credit on the co-op's property tax bill. A well-run board passes it to shareholders as a maintenance credit proportional to their shares. Some boards just fold it into the building's general fund, which is technically improper. The NYC Department of Finance posts abatement data by BBL, so shareholders can look up whether their building got an abatement and how much.

How can a shareholder find out what their building's property taxes actually are?

Three sources, all free and public.

First, the NYC Department of Finance property lookup at nyc.gov/finance lets you enter the building address and pull the Notice of Property Value, the tax bill, and the abatement history. ^[4] You need the building's address, not your unit number. The building has one BBL, and that's how the city organizes its records.

Second, the co-op's own financial statements. New York Business Corporation Law requires co-ops to give shareholders annual financial statements. The property tax expense is a line item in operating expenses. If the board won't share them, a shareholder can formally request them.

Third, for buildings outside NYC, the county assessor's website publishes the assessment roll and tax bill. Most New York counties run online parcel search tools. The NYS Office of Real Property Tax Services keeps a directory of local assessors. ^[10]

Once you have the total tax number and the number of shares your apartment carries, you can figure your effective property tax burden. Divide your shares by total shares outstanding, multiply by the annual tax bill, and that's your share of the property tax. Compare it to what you'd pay owning a condo of similar value. The gap can be surprisingly large in either direction, depending on the building's age, exemptions, and abatement status.

If you find the building is overassessed and want to understand the appeal process before bringing it to the board, the TaxFightBack DIY appeal kit walks through how to build the income and expense evidence that a New York tax certiorari attorney or the Tax Commission will actually care about.

What happens to co-op property taxes when the building gets a tax abatement like 421-a or J-51?

Some co-op buildings, especially those converted from rental housing or newly built before 2022, carry legacy tax abatements under 421-a or J-51. These programs gave developers or converters years of reduced property taxes in exchange for affordable housing commitments or building improvements. ^[12]

While a building sits inside a 421-a or J-51 benefit period, the property tax bill can be dramatically lower than it would otherwise be. That benefit passes to all shareholders through lower maintenance charges. When the abatement expires, the tax bill can jump sharply, sometimes doubling or tripling, and maintenance climbs to match. Boards that don't prepare shareholders for this transition create serious financial hardship.

Buying a co-op? The offering plan and financial statements should disclose any active tax abatement and its expiration date. Ask your attorney to flag it during due diligence. A building whose 421-a abatement expires in three years is a very different financial proposition than one with no abatement at all.

The 421-a program expired in June 2022 and was not renewed under that name as of mid-2025, though New York State kept debating a replacement through various legislative proposals. Existing 421-a benefits already granted continue through their statutory terms. ^[12]

What should a co-op shareholder actually do if they think the building is overtaxed?

Start by getting the facts. Pull the building's Notice of Property Value from the NYC Department of Finance and note the current assessed value and the prior year's. ^[4] If the assessed value jumped more than 8% in a single year or more than 30% over five years, that breaks the statutory caps under RPTL section 1805 and gives you grounds for an immediate challenge. ^[3]

Next, compare the city's income estimate to what the building actually reports in its financial statements. The Department of Finance estimates rental income using comparable rental buildings. If your building's real operating income comes in well below what the city assumed, that gap is the foundation of an appeal.

Bring the data to the board in writing before the January 15 Tax Commission filing window opens. Boards sometimes skip filing because they assume it isn't worth the effort, or because the managing agent never flagged it. A shareholder with a written analysis and a clear ask tends to get action.

If the board won't act and the building is genuinely overassessed, shareholders can propose a resolution at the annual meeting, or consult a tax certiorari attorney independently. Most offer free initial consultations and will send a letter to the board at no cost to lay out the case.

For shareholders who want to know what evidence actually moves assessors and review boards, TaxFightBack's DIY appeal kit covers how to build an income and expense argument. That's exactly the evidence type that works for Class 2 properties in New York.

Frequently asked questions

Do I pay property tax separately as a co-op owner in New York?

No. You pay it indirectly through your monthly maintenance charge. The co-op corporation receives the tax bill as the legal owner of the building and allocates the cost among shareholders in proportion to their share count. There is no separate property tax bill sent to individual co-op shareholders.

Can I personally appeal my co-op's property tax assessment?

Individual shareholders have no standing to file a property tax appeal in New York because they don't own the real property. Only the co-op corporation can appeal. You can, however, push the board to file and provide evidence to support the case. If the board refuses to act on a well-supported claim, the issue can be raised formally at a shareholder meeting.

What is the NYC property tax class for a co-op apartment building?

Co-op buildings with more than ten units are Class 2 properties under New York City's tax classification system. The city assesses them using the income approach, treating the building as if it were a rental. The assessment ratio for Class 2 is 45% of estimated market value, and the fiscal year 2024-2025 tax rate was 12.267%.

How does STAR work for co-op shareholders?

Qualifying co-op shareholders can register for STAR with the New York State Tax Department. Most shareholders who registered after 2015 get a STAR credit as a check from the state rather than a reduction in the building's tax bill. Enhanced STAR is available to shareholders age 65 and over with income below $107,300 (2024 threshold, indexed annually). Registration is through the NYS Tax Department.

What is the senior citizen exemption for co-op owners and how do I apply?

The Senior Citizen Homeowners' Exemption (SCHE) reduces the assessed value of a qualifying shareholder's proportionate share by up to 50%. Eligibility requires being 65 or older with combined income below $58,399 (NYC 2024 threshold). Apply to the NYC Department of Finance by March 15. The building receives the benefit and must credit the qualifying shareholder's maintenance accordingly.

When is the NYC Tax Commission filing deadline for co-op appeal?

The co-op board must file an appeal with the NYC Tax Commission between January 15 and March 1 of the tax year being contested. This window is firm. Missing it means the building cannot challenge that year's assessment administratively and would need to wait for the following year's Notice of Property Value.

How is a co-op assessed differently from a condo in New York?

Both co-ops and condos are Class 2 properties assessed under the income approach, but condo owners have individual tax lots and can file their own appeals. Co-op shareholders have no individual standing. The Cooperative and Condominium Tax Abatement applies to both, but the primary residence requirement and the exclusion of 421-a buildings can affect eligibility differently depending on the building's history.

What is the cooperative and condominium tax abatement in New York City?

It's a tax credit applied directly to a qualifying co-op building's tax bill. Abatement percentages range from 17.5% to 28.1% depending on the assessed value per unit. The building's managing agent must file to claim it. The credit is supposed to pass to qualifying shareholders as a maintenance reduction. Buildings with 421-a or J-51 benefits are generally excluded.

How much of my co-op maintenance is property tax?

Property taxes usually run 30% to 50% of a co-op's total maintenance expense, though the range varies widely. To find your building's exact tax bill, search the building's address at the NYC Department of Finance property lookup. Your proportionate share is your apartment's share count divided by total shares outstanding, multiplied by the annual tax bill.

What happens to co-op property taxes when a 421-a abatement expires?

When the 421-a benefit period ends, the building's full assessed value becomes taxable and the tax bill can jump sharply, sometimes doubling. Maintenance charges rise to match. If you're buying a co-op with an active abatement, ask your attorney to pin down the expiration date and model what maintenance could look like after it ends.

Does New York State Real Property Tax Law section 581 affect co-op values?

Yes. RPTL section 581 requires that cooperatives be assessed as if they were rental properties, not at the aggregate market value of the individual units. This often produces a lower assessed value than the actual price the apartments command on the open market, which can benefit shareholders in established co-ops where unit prices have climbed well above rental income capitalization values.

Can a co-op shareholder in Nassau or Westchester challenge the assessment?

The same rule applies outside New York City: only the co-op corporation can file. In Nassau County, the grievance deadline is usually the third Tuesday in May with the Assessment Review Commission. In Westchester, grievance day is the fourth Tuesday in May at the relevant town assessor's office. Shareholders should bring the evidence to the board well before those dates.

How do I find my co-op building's property tax bill online?

Go to the NYC Department of Finance property lookup at nyc.gov/finance, enter the building's street address (not your unit number), and pull the tax bill and Notice of Property Value. The building has one borough-block-lot number covering all units. For buildings outside NYC, use the county assessor's online parcel search or the NYS ORPTS assessor directory.

Are co-op shareholders eligible for the veterans property tax exemption in New York?

Yes. Qualifying veterans who are co-op shareholders can apply for the Alternative Veterans Exemption or the Eligible Funds Exemption through the NYC Department of Finance. The exemption reduces the assessed value attributed to the shareholder's proportionate share, and the savings must be passed through as a maintenance credit.

Sources

1. NYC Department of Finance, Property Tax Rates FY2025: Class 2 properties (including co-ops with more than 10 units) face a tax rate of 12.267% applied to 45% of estimated market value for fiscal year 2024-2025.
2. New York State Legislature, Real Property Tax Law (RPTL): RPTL section 581 requires co-ops be assessed as rental properties; RPTL section 1805 caps Class 2 assessed value increases at 8% annually and 30% over five years; RPTL section 467 extends the senior citizen exemption to cooperatives.
3. NYC Tax Commission: Only the co-op corporation (not individual shareholders) has standing to file an administrative appeal with the NYC Tax Commission; the filing window is January 15 to March 1.
4. NYC Tax Commission (filing deadlines): The annual deadline to file an income-producing property appeal with the NYC Tax Commission is March 1; the window opens January 15.
5. NYC Department of Finance, Benefits for Property Owners: Individual co-op shareholders can apply for SCHE, DHE, and veterans exemptions; the benefit reduces the building's assessed value and must be passed to the qualifying shareholder as a maintenance credit.
6. NYS Department of Taxation and Finance, STAR Program: Enhanced STAR income limit for 2024 is $107,300 (adjusted annually); shareholders who registered after 2015 receive a credit check rather than a bill reduction; co-op shareholders are eligible.
7. Nassau County Assessment Review Commission: The grievance filing deadline in Nassau County is typically the third Tuesday in May; co-op boards (not individual shareholders) must file.
8. NYS Department of Taxation and Finance, Office of Real Property Tax Services: ORPTS publishes annual equalization rates for all municipalities and maintains a directory of local assessors statewide.
9. NYC Department of Finance, Benefits for Property Owners (Co-op/Condo Abatement): The co-op/condo abatement reduces qualifying buildings' tax bills by 17.5% to 28.1% depending on assessed value per unit; buildings with 421-a or J-51 benefits are excluded; the managing agent must file to claim the benefit.
10. NYC Department of Housing Preservation and Development: The 421-a program expired June 2022; existing benefits continue through their statutory terms; new 421-a benefits are no longer granted under that program.