New York's real estate investors face one of the country's steepest state income tax burdens - individual rates climb to 10.9% on income above $25 million, with additional high-earner brackets of 9.65% above roughly $1.08 million and 10.3% above $5 million, and New York City residents add a city income tax on top of that. That combined load is precisely the environment in which an engineering-based cost segregation study earns its keep: it accelerates depreciation into the year an owner needs the deduction most, on federal returns where the One Big Beautiful Bill Act's 100% bonus depreciation now applies. New York's own rules add a wrinkle worth understanding before you file - the state decouples from federal bonus depreciation, so the strategy has to be read on both the federal and state side to be used well.
Apex Reserve Group is an Irvine, California-based firm that prepares engineering-based cost segregation studies for real estate investors nationwide, including throughout New York State. This page is general educational information, not tax or legal advice - every property and every filer's situation differs, and you should confirm how any of this applies to you with a qualified CPA or tax attorney before making a filing decision.
Why Cost Segregation Pays Off in New York
New York taxes individual income on a graduated scale that tops out at 10.9% on income above $25 million. Rates for most taxpayers climb through 3.9%, 4.4%, 5.15%, 5.4%, 5.9%, and 6.85%, then step up for high earners: 9.65% on income above roughly $1.08 million (about $2.16 million for joint filers), 10.3% above $5 million, and 10.9% above $25 million. New York City residents layer an additional city income tax of up to roughly 3.9% on top of the state rate. That combined burden ranks among the highest in the country, which is exactly the environment where a large, well-documented depreciation deduction is worth the most.
Here is the wrinkle specific to this state: New York does not conform to federal bonus depreciation. Federal law under the One Big Beautiful Bill Act (OBBBA) now allows 100% bonus depreciation for qualifying components, but New York requires taxpayers to add that bonus amount back to income on the state return (using Form IT-398 and Form IT-225) and instead depreciate the same components under New York's own, pre-bonus depreciation schedule - recovering the deduction gradually through a subtraction modification in later years rather than all at once. In practice, a cost segregation study still delivers its full effect on your federal return, while the New York State benefit shows up over time rather than in year one. The study still helps at the state level too, because reclassifying components into 5-, 7-, and 15-year property shortens their depreciation period compared with the default 27.5-year (residential) or 39-year (commercial) schedule - New York just doesn't let you compress that shorter schedule into a single year the way the federal bonus rule does. (New York carves out a narrow, legacy exception to the addback for certain Lower Manhattan 'Liberty Zone' and 'Resurgence Zone' property tied to post-9/11 redevelopment, but it has no bearing on typical rental property elsewhere in the state.)
Property taxes add another layer to the calculus: New York's statewide average effective property tax rate runs around 1.3%, and many Hudson Valley and Catskills counties run well above that figure. And because New York City's Local Law 18 (effective September 2023) requires short-term-rental registration and has all but eliminated whole-unit short-term rentals inside the five boroughs, the state's active Airbnb and short-term-rental investment activity has shifted to markets like the Catskills, the Hudson Valley, the Adirondacks, the Finger Lakes, Lake George, and the Hamptons on Long Island - all places where an engineering-based cost segregation study can still make a material difference on an owner's federal return.
How a Cost Segregation Study Works
A cost segregation study is an engineering-based analysis of a building's construction cost or purchase price. Rather than depreciating an entire residential rental over 27.5 years or a commercial property over 39 years, a qualified engineer walks the property, or reviews detailed construction records, and separates out components the tax code already recognizes as shorter-lived: flooring, cabinetry, appliances, decorative and specialty electrical or plumbing, fencing, paved areas, and landscaping, among others. Those components typically fall into 5-, 7-, or 15-year recovery classes instead of the building's long default schedule.
Under current federal law, most property in those shorter classes qualifies for 100% bonus depreciation when it is both acquired (or placed under a written binding contract to acquire) after January 19, 2025, and placed in service after that same date, meaning the entire reclassified amount can be deducted in the first year rather than spread across decades. (Property under a binding contract signed on or before January 19, 2025 but placed in service later instead stays on the prior law's phase-down schedule.) The result is a front-loaded federal deduction that can meaningfully reduce a given year's taxable income, in the year it is needed most - typically the year a property is purchased, built, or substantially renovated.
A New York Cost Segregation Example
For illustration only - your results depend on your property and tax situation. Say an investor buys a $700,000 short-term rental cabin in the Catskills, with $550,000 allocated to the depreciable building and the rest to land. A cost segregation study might reclassify roughly 25%, or about $137,500, into 5-, 7-, and 15-year property - items like flooring, cabinetry, appliances, a portion of the electrical system, and site improvements such as a driveway, deck, and landscaping.
On the federal return, since the property was both acquired and placed in service after January 19, 2025, that $137,500 could potentially be deducted in full in the first year under 100% bonus depreciation, rather than trickling out over 27.5 years. On the New York return, that same $137,500 has to be added back, because New York decouples from federal bonus depreciation - the state instead lets the owner depreciate those same components on their own 5-, 7-, and 15-year schedules without the bonus acceleration, recovering the deduction over several years instead of one. The federal benefit and the New York benefit are both real, but they land in different amounts and different years. None of these numbers are a projection for any specific property - an actual study would price out your building's real components, and your CPA would model both the federal and New York outcomes against your specific income and filing status.
Already Own Your New York Property? The Look-Back Study
Cost segregation is not limited to the year of purchase. If you have owned a New York rental property for years without ever having a study performed, a look-back study lets you claim the depreciation you missed as a one-time catch-up adjustment, using IRS Form 3115 and a Section 481(a) adjustment, without amending a single prior-year tax return. The engineer analyzes the property as it stands today, calculates what should have been classified as 5-, 7-, and 15-year property since the placed-in-service date, and the catch-up amount is claimed in the current tax year.
For New York purposes, the same decoupling rules apply to a look-back study's catch-up amount as apply to a new acquisition - the federal Section 481(a) adjustment is added back on the state return and recovered under New York's own depreciation schedule instead. A CPA should model both the federal and New York outcomes before you file a look-back study.
Who Should Consider Cost Segregation in New York
Cost segregation tends to make the most sense for:
- Short-term rental and Airbnb hosts operating outside New York City, in markets such as the Catskills, the Hudson Valley, the Adirondacks, the Finger Lakes, Lake George, and the Hamptons on Long Island, where whole-unit short-term rentals remain viable after NYC's Local Law 18 restrictions.
- Long-term rental property owners anywhere in the state who want to accelerate federal depreciation on an existing residential or commercial asset.
- Recent buyers or owners who have substantially renovated a rental property, since a study can capture both acquisition cost and renovation cost.
- High-earning New York taxpayers considering the short-term-rental strategy, where an average guest stay of seven days or less, combined with material participation in the activity, can make STR losses non-passive - allowing them to offset active or W-2 income rather than being trapped as passive losses.
Whether it makes sense for your specific property depends on your basis, your holding period, and your overall tax picture - a conversation your CPA should be part of.