By Andrew Borchini · April 2026
How to verify a condo’s tax benefit, model costs after it ends and compare apartments over your expected ownership period.
Low property taxes can make an NYC condo look especially affordable. Before making an offer, establish why the bill is low, how long the benefit lasts and what your budget could look like afterward.
A tax benefit can provide meaningful savings while it is in effect. Those savings should be evaluated over the years you expect to own the apartment, alongside the purchase price and the costs a future buyer may face. Start with the actual unit's records rather than the monthly tax figure in the listing.
Identify the tax benefit first
Listings often use “tax abatement” broadly, but the underlying programs differ. An exemption reduces the property's assessed value before tax is calculated. An abatement reduces the resulting tax bill. NYC's Department of Finance explains both in its property tax guidance. [1]
For condo buyers, two benefits are especially important to distinguish:
Benefit | What buyers need to understand |
|---|---|
421-a exemption | A construction-related benefit with a specific term and schedule. The exemption can decrease before it ends. |
Co-op and condo abatement | A separate benefit for eligible developments and owners. Primary residence, ownership and application requirements matter. |
421-a has multiple versions. Older buildings can have 10-, 15-, 20- or 25-year schedules, and later programs have different terms. Some benefits phase down during their final years. A listing's expiration year tells you only part of the story; find the schedule governing this unit. [2]
Check the unit's records in four steps
1. Identify the correct tax lot. Obtain the condo unit's borough, block and lot number, commonly called its BBL. Confirm that the records you review relate to the unit you are buying. The Department of Finance's Property Tax Public Access portal lets you search property records. [3]
2. Read the current tax bill. Ask for the latest bill and check the tax period and benefits applied. A seller's mortgage escrow payment or a monthly figure in the listing can require further reconciliation. The annual Notice of Property Value is useful, but it is not a tax bill. [3]
3. Confirm the benefit code and schedule. Establish the benefit's start year, end year and current stage with management and your attorney or tax adviser. Match the program to the Department of Finance's published 421-a schedules, including any cap or phase-down. A percentage in the schedule describes the exemption; it is not necessarily the same percentage reduction in the entire tax bill. [2]
4. Check eligibility after your purchase. Identify any benefit that depends on the owner's circumstances. Confirm whether your intended use and ownership structure qualify, who must report the ownership change and when a benefit could begin or end for you. The seller's current bill does not settle those questions. [4]
Build a budget for the years you expect to own
Start with today's tax bill, then model the remaining benefit and the period after it ends. Keep common charges, insurance, assessments and any mortgage payments visible in the broader ownership budget.
Consider this hypothetical five-year example. The tax figures are planning assumptions, rather than a statutory 421-a schedule or a forecast for a particular apartment. Common charges are held at $1,800 a month to isolate the tax change.
Ownership year | Annual property tax | Monthly tax equivalent | Common charges plus monthly tax |
|---|---|---|---|
Year 1 | $6,000 | $500 | $2,300 |
Year 2 | $6,000 | $500 | $2,300 |
Year 3 | $12,000 | $1,000 | $2,800 |
Year 4 | $18,000 | $1,500 | $3,300 |
Year 5 | $24,000 | $2,000 | $3,800 |
In this example, the monthly tax equivalent rises by $1,500. Total property taxes over five years are $66,000, compared with $30,000 if the initial bill had remained unchanged. The difference is $36,000 before any financing cost or change in common charges.
Use the actual benefit schedule when evaluating an apartment. Have your adviser account for the taxable assessment, any exemption cap and other applicable benefits. Future assessed values and tax rates can also change, so a precise post-expiration dollar amount should be identified as an estimate.
Could another abatement apply after 421-a ends
The separate co-op and condo abatement may help some eligible owners after a 421-a exemption expires. Eligibility is not automatic. The Department of Finance says a development generally cannot receive this abatement while it receives 421-a, but it can apply when the existing benefit is due to expire on June 30 of the tax year in which it is applying. [4]
The unit generally must be the owner's primary residence, with additional ownership and building requirements. LLC-held units are generally excluded, subject to limited exceptions. The board or authorized agent applies and renews on behalf of the development. Purchase timing also affects when an eligible owner can qualify. [4]
Ask management whether it plans to apply, whether the development qualifies and what information it needs from you. Budget on a documented basis rather than assuming a replacement benefit will arrive.
Use the future tax bill when comparing apartments
Compare condos over the same holding period. One may have low taxes for several more years; another may already carry a bill without the temporary exemption. Look at the expected cumulative taxes and the monthly costs toward the end of your ownership period, alongside the apartments' other differences.
For example, in the five-year scenario above, an apartment with a constant $12,000 annual tax bill would total $60,000 in taxes. The hypothetical apartment starting at $6,000 would total $66,000. Its initial bill is lower, while its five-year tax budget is $6,000 higher. Actual bills for either apartment could change.
That comparison does not determine which apartment to buy. It gives you a clearer basis for comparing prices and deciding what you can comfortably own. At resale, the next buyer will evaluate the benefit and taxes remaining then. Include that position in your review without assuming a particular price discount or appreciation rate.
Our building financials guide covers other costs that can change during ownership. Our NYC closing cost calculator estimates one-time acquisition expenses; annual property taxes belong in your ongoing budget.
Questions to resolve before an offer
Which tax benefit applies to this unit, and what records confirm it?
Does the benefit decrease before its stated expiration date?
What is the estimated annual bill after the benefit ends?
Could your use or ownership structure change eligibility for any benefit?
Is another abatement available, and who will handle the application?
How do the projected costs compare with other apartments over your expected holding period?
Evaluate the purchase with BRN
We specialize in representing buyers and help you compare the asking price with the costs and obligations that come with the apartment. We work alongside your attorney and other advisers to identify the questions that should inform your offer.
You never pay BRN a brokerage fee. We return half of the commission we receive from the seller to you, up to 1.5% of the purchase price.
Considering a condo with a tax benefit? Send us the listing, and we can discuss the numbers and records to review.
Sources
[1] NYC Department of Finance — Class 2 Property Tax Guide.
[2] NYC Department of Finance: 421-a exemption information and 421-a benefit schedules; NYC Housing Preservation and Development: 421-a programs.
[3] NYC Department of Finance: Property Tax Public Access and Notice of Property Value.
[4] NYC Department of Finance — Cooperative and Condominium Property Tax Abatement.
