Most NYC small-building owners are paying property tax under Class 2 — but Class 2 isn’t one bucket. It’s four sub-buckets, and only one of them gets the small-building protection. If your building has between 2 and 10 units and your tax bill looks like a big-tower’s bill, you’re either in the wrong sub-class on the assessment roll or you’re hitting a wall most owners don’t know exists. Here is the plain-English map of Class 2a, 2b, 2c, and the “big Class 2” that catches everyone else — with form numbers, phone numbers, and the assessment caps that are written into New York State Real Property Tax Law.
The four buckets of NYC Class 2
NYC property is split into four tax classes. Class 1 is mostly one-to-three-family homes and small condos up to three stories. Class 2 is the rest of the residential pool — rental buildings, co-ops, and condos that don’t qualify for Class 1. Class 3 is utility property. Class 4 is commercial and industrial.
What surprises owners is that the NYC Department of Finance further splits Class 2 into four sub-buckets, and the sub-bucket controls how fast your assessed value is allowed to climb each year. Straight from the DOF Definitions of Property Assessment Terms:
- Sub-class 2a — a 4-to-6-unit rental building
- Sub-class 2b — a 7-to-10-unit rental building
- Sub-class 2c — a 2-to-10-unit cooperative or condominium
- Class 2 (the big bucket) — 11 units or more
The unit count is the dividing line. Once a building crosses 10 units, the small-building protections disappear and the property is treated like a 200-unit tower for purposes of how quickly DOF can raise its assessed value.
The FY2026 tax rate is the same across all of Class 2
Here is the first thing most owners misunderstand. The tax rate doesn’t change between sub-categories. According to the official NYC DOF Property Tax Rates page, the FY2026 rates are:
- Class 1: 19.843%
- Class 2: 12.439% (this rate applies to 2a, 2b, 2c, and 11+ unit Class 2)
- Class 3: 11.108%
- Class 4: 10.848%
A 4-unit rental walk-up in Inwood pays the same nominal rate per dollar of taxable value as a 300-unit Hudson Yards rental tower. What changes is the taxable value the rate gets multiplied against. That is where the sub-classes do their real work.
The assessment ratio: 45% across all of Class 2
The “level of assessment,” also called the assessment ratio, is the percentage of market value DOF uses to calculate your assessed value. Per the DOF page on Determining Your Assessed Value:
- Tax Class 1: 6%
- Tax Classes 2, 3, and 4: 45%
That 45% number is a giant lever. A market value of $2,000,000 produces an “uncapped” assessed value of $900,000 in Class 2 versus $120,000 in Class 1. Multiply by the 12.439% Class 2 rate and a hypothetical, fully assessed $2 million Class 2 building would owe roughly $111,951 a year. That is why the assessment caps written into state law matter so much — without them, small-building rental owners would be wiped out by a single hot sales year on the block.
What 2a, 2b, and 2c actually buy you: the 8% / 30% cap
This is the part of the system that small-building owners do not know exists by default — and which their managing agent or accountant should be checking every year. Again, straight from DOF’s Determining Your Assessed Value page:
Tax classes 2a, 2b, and 2c: assessed value increases are capped at 8% per year and no more than 30% over five years for buildings with 10 or fewer units.
That cap is the entire point of being in 2a, 2b, or 2c. If your building’s market value jumps 25% in a year because three brownstones on the same block flipped at record prices, your assessed value still can’t move more than 8% that year — and not more than 30% over a rolling five-year window.
For Class 1 owners, the equivalent cap is even tighter: 6% per year, 20% over five years. For “big” Class 2 (11+ units) and Class 4, there is no annual percent cap. Instead, the state uses a different mechanism: assessment changes are phased in over five years through what DOF calls the transitional assessed value. That phase-in smooths volatility but doesn’t put a ceiling on the eventual catch-up the way the 2a/2b/2c cap does.
Why the 2c bucket matters for co-op and condo boards
The 2c bucket — a 2-to-10-unit cooperative or condominium — is the one that the most NYC building boards miscategorize. A 9-unit brownstone co-op in Park Slope is structurally a Class 2 property, but it is supposed to live inside sub-class 2c with the 8%/30% cap protection. If DOF’s records show that building as plain Class 2 instead of 2c, the cap doesn’t get applied and the assessed value can run away in a hot year. The fix is to file with DOF to correct the property’s classification on the assessment roll.
The same logic applies to small rental owners. If your 5-unit walk-up is marked plain Class 2 instead of 2a, the cap is not being honored. The first thing to do before anything else is pull your Notice of Property Value (NOPV) and look at the tax class field. If it says “2” with no letter, call DOF.
How to check what sub-class DOF has you in
Every property in NYC gets a Notice of Property Value mailed in January, and an electronic version is available on the Property Information Portal. The NOPV lists the tax class. Per the FY2026 tentative assessment roll press release, this year’s NOPVs reflect property condition as of January 5, 2025 and govern the tax year that began conceptually on July 1, 2025 and runs through June 30, 2026.
If the class designation is wrong — say you bought a 6-unit rental and it’s still listed as something else — file a Request for Review of Property Value. For Class 2 properties there is a dedicated form: RPIE-style Request for Review for Class 2 properties, available as a PDF from DOF (see “Request for Review of Property Value for Tax” on nyc.gov). The Request to Update path is the place to fix factual property data like unit count, square footage, or class — it is not the same thing as challenging the assessed value, which is a separate process before the NYC Tax Commission.
If the value is wrong, not just the class: the Tax Commission path
If the unit count and class designation are correct but you still think the assessed value is too high, the next step is an appeal to the independent NYC Tax Commission. Per the FY2026 tentative roll release, the deadlines are tight:
- Class 2, 3, and 4 properties — deadline to challenge: March 3 (annual)
- Class 1 properties — deadline: March 17 (annual)
The Tax Commission form for income-producing properties is TC-201; the cover form to start any protest is TC-100 series (TC-101 for one-family, TC-108 for condos, etc.). The full instructions live at the NYC Tax Commission website. Missing the March deadline means you wait a full year to protest. For Tax Commission filing questions, call 311 and ask for the Tax Commission, or call the DOF general line at 212-NEW-YORK (212-639-9675).
Worked example: a 6-unit Brooklyn rental in sub-class 2a
Suppose DOF estimates your 6-unit walk-up’s market value at $1,500,000 for FY2026.
- Apply the 45% Class 2 assessment ratio → uncapped assessed value of $675,000
- Apply the 2a cap (8%/year, 30%/5 years) → if last year’s assessed value was $600,000, this year’s actual assessed value can rise by at most 8% to $648,000
- Subtract any exemptions (J-51, 421-a, SCHE for an owner-occupant, etc.) to get the taxable value
- Multiply by the Class 2 tax rate of 12.439% to get the annual property tax bill
That worked example is exactly the structure DOF uses in its own walkthrough on the Calculating Your Annual Property Tax page. If your building has 11 or more units the cap doesn’t apply and the assessed value is instead phased in over five years via the transitional value mechanism.
The “effective market value” trap
One more vocabulary item that catches owners: if your assessed value is being held down by the 2a/2b/2c cap, DOF will report an effective market value on your notice that is different from the market value DOF estimated. The effective market value is calculated by dividing your capped assessed value by the 45% ratio, per DOF’s Definitions page. To win a Tax Commission appeal on value, you have to prove the property is worth less than that effective market value figure — not the headline DOF market value.
Quick reference card
- Sub-class 2a — 4-6 unit rental — 45% assessment ratio — 8%/yr, 30%/5yr cap
- Sub-class 2b — 7-10 unit rental — 45% assessment ratio — 8%/yr, 30%/5yr cap
- Sub-class 2c — 2-10 unit co-op or condo — 45% assessment ratio — 8%/yr, 30%/5yr cap
- Class 2 (11+ units) — 45% assessment ratio — no annual percent cap, instead 5-year phase-in via transitional value
- FY2026 Class 2 tax rate: 12.439% (same for all sub-classes)
- Tax Commission protest deadline, Class 2: March 3
- Form to fix property data with DOF: Request to Update
- Form to protest value to the Tax Commission: TC-100 series cover + TC-201 income/expense schedule for income-producing buildings
- DOF general phone: 311 in NYC; 212-NEW-YORK (212-639-9675) out of city; TTY 212-504-4115
Legal authority
The Class 2 sub-categories and their cap rules trace back to New York Real Property Tax Law (RPTL) § 1805, which governs the annual and five-year limitations on assessment increases for class 1 and class 2 sub-classes 2a, 2b, and 2c. The tax rate setting itself happens annually through the NYC City Council under NYC Administrative Code Title 11, Chapter 2. The Tax Commission’s jurisdiction is set out in NYC Charter § 153.
What to do this week if you own a 2-to-10-unit NYC building
- Pull your latest NOPV from the Property Information Portal.
- Confirm the tax class field shows the correct sub-class (2a, 2b, or 2c). If it’s missing the letter, file a Request to Update with DOF.
- Compare this year’s actual assessed value against last year’s. The increase should be no more than 8%. If it’s more, the cap is not being applied and that’s a Request to Update filing.
- If the value itself feels too high, mark March 3 of next year on the calendar — that is the Class 2 Tax Commission protest deadline.
- For abatement programs that further reduce your bill (J-51 for rehab, the Cooperative and Condominium Property Tax Abatement for 2c owners), see the DOF Property Tax Benefits portal.
Tax advice in this article is informational. Consult a tax professional or the NYC Department of Finance for your specific situation.
Frequently Asked Questions
What is the difference between NYC tax class 2a and 2b?
2a is a rental building with 4 to 6 units; 2b is a rental with 7 to 10 units. Both share the same 45% assessment ratio and the same 8%-per-year, 30%-over-five-years cap on assessed value increases. The split exists for assessment administration and statistical reporting at DOF; the resident financial outcome is identical between the two sub-classes.
Are NYC condos in class 1 or class 2?
Most NYC condos are Class 2. The only condos in Class 1 are those that are part of a structure of three stories or fewer (per DOF’s tax class definitions). A 2-to-10-unit condo is more specifically sub-class 2c.
What is the NYC property tax rate for class 2 in 2026?
12.439% for FY2026, per the NYC Department of Finance Property Tax Rates page. This rate applies to sub-classes 2a, 2b, 2c, and the 11+ unit “big” Class 2 alike.
Can my NYC assessed value go up more than 8% in a year?
Not if your property is in sub-class 2a, 2b, or 2c. State law caps the annual increase at 8% and the five-year cumulative increase at 30%. If your assessed value rose more than 8%, contact DOF — either your sub-class designation is wrong on the roll or the cap was not applied. Call 311 or 212-639-9675.
How do I file a tax grievance for an NYC Class 2 building?
File with the NYC Tax Commission, not DOF. The Tax Commission protest deadline for Class 2 is March 3 each year. The starting form is the appropriate TC-100 series cover (for example TC-108 for condos) plus the TC-201 income and expense schedule if your building is income-producing. Full instructions are at the NYC Tax Commission website.
Where do I find my NYC tax class?
On your annual Notice of Property Value, or in the NYC Property Information Portal under your borough-block-lot. The tax class field will show 1, 2, 2a, 2b, 2c, 3, or 4.
This article is independent informational reporting. HelpNewYork does not sell tax-prep services, does not take affiliate revenue from law firms, and is not affiliated with any tax-grievance vendor.
