Cost Segregation and Bonus Depreciation for Philadelphia Rental Property in 2026 and 2027
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By Max Karasick, Compass real estate agent licensed in PA and NJ
Here's the short version. A cost segregation study breaks your rental building into pieces the IRS lets you write off faster than the 27.5 years it gives the building itself: 5-year stuff like appliances and carpet, 15-year stuff like fences and paving. As of October 2026, federal law gives a 100% special depreciation allowance (bonus depreciation) to qualified property acquired and placed in service after January 19, 2025, so those shorter-life pieces can often be written off in year one. Now the "but." Passive activity rules can limit the losses, Pennsylvania doesn't allow bonus depreciation at all and a lot of the benefit comes back as recapture when you sell.
This is general information, not tax advice. Confirm every number with your CPA before you act on it.
What Is a Cost Segregation Study?
You paid one price for the rental, but you actually bought a bundle of different things. The IRS Cost Segregation Audit Techniques Guide describes a study as allocating that lump-sum cost to individual assets: land, land improvements, the building, equipment, furniture and fixtures. Each one gets its own recovery period.
For a residential rental, IRS Publication 527 lists the recovery periods that matter most:
5 years: appliances like stoves and refrigerators, carpets and furniture used in the rental.
15 years: land improvements like roads, fences and shrubbery.
27.5 years: the residential rental building and its structural components, like furnaces, water pipes and venting.
Never: land. Publication 527 lists land as rental property you can't depreciate. Dirt doesn't wear out.
Skip the study and most owners dump everything but the land into the 27.5-year bucket and depreciate it in a straight line. A study pulls the parts that qualify into the shorter classes. On audit, examiners use a matrix in that same guide to sort common residential rental items into those classes.
Is Bonus Depreciation 100% in 2026?
Yes, if your property hits the dates. Publication 946 says P.L. 119-21, better known as the One Big Beautiful Bill Act, brought back the 100% special depreciation allowance for certain qualified property acquired and placed in service after January 19, 2025. Treasury and the IRS called it a permanent 100% deduction in Notice 2026-11, released January 14, 2026. The rules as of October 2026:
What qualifies: tangible property depreciated under MACRS with a recovery period of 20 years or less. That's the 5-year and 15-year parts of a rental. The 27.5-year building doesn't make the cut. Used property can qualify, which is handy, since most rentals are bought, not built.
The acquisition date: property has to be acquired after January 19, 2025. Under Notice 2026-11, property isn't treated as acquired after the date you entered a written binding contract for it. So a building under a binding agreement of sale signed before January 20, 2025 falls under the older rules.
Older acquisitions: qualified property acquired after September 27, 2017 and before January 20, 2025 and placed in service in 2025 gets 40%, per Publication 946.
Opting down: for the first tax year ending after January 19, 2025, you can elect 40% instead of 100%. Or you can elect out of the allowance entirely.
The year-end detail that matters is the placed-in-service date. Publication 527 says depreciation starts when the rental is ready and available for rent. Closed and ready to lease by December 31, 2026? It can start depreciating in 2026. Close in January and it belongs to 2027.
Worked Example: A Hypothetical Small Multifamily
Every number below is made up and rounded. Real allocations come from the study, and your tax result depends on your whole return.
Purchase price: $1,000,000 for a fourplex.
Land: $200,000, not depreciable.
Building basis: $800,000.
Study allocation: $120,000 to 5-year property, $60,000 to 15-year property and $620,000 to the 27.5-year building.
No study? The full $800,000 gets depreciated over 27.5 years, about $29,091 for a full year ($800,000 divided by 27.5). The first year is prorated by the month the property goes into service.
With the study and 100% bonus depreciation, the $180,000 of 5-year and 15-year property ($120,000 plus $60,000) can come off in year one. The remaining $620,000 still runs over 27.5 years, about $22,545 for a full year. So your first-year deduction jumps from roughly $29,000 at most to roughly $180,000 plus a partial year on the building.
Just know what you're getting. It's a timing change, not a bigger total. You deduct the same $800,000 either way. The study changes when.
The Catches: Passive Losses, Recapture and State Rules
Passive Activity Limits
A big deduction only helps if you can use it. Publication 527 says rental real estate activities are generally passive, and the losses aren't deductible unless you have other passive income to soak them up, with some exceptions. Whether you can use the loss this year, carry it forward or squeeze into an exception is a CPA question, and it's one to ask before you order a study.
Depreciation Recapture When You Sell
Faster deductions now usually mean more tax later. Uncle Sam keeps a ledger. Publication 544 says gain on section 1245 property, which includes personal property like appliances and carpet, is treated as ordinary income up to the depreciation allowed or allowable. On the building and other real property, Tax Topic 409 says the part of the gain from straight-line depreciation (unrecaptured section 1250 gain) is taxed at a maximum 25% rate. Depreciation taken faster than straight line can be ordinary income. A 1031 exchange can defer gain, though Publication 544 notes section 1245 recapture can still apply in an exchange.
Pennsylvania and New Jersey
Pennsylvania sits this one out. The Department of Revenue says Pennsylvania personal income tax doesn't follow the federal bonus depreciation provisions, and no bonus depreciation may be taken for PA purposes. So expect two different depreciation schedules for the same building, one federal and one PA. Across the river, New Jersey's 2025 NJ-1040 instructions require a New Jersey depreciation adjustment when you took federal bonus depreciation, using Worksheet GIT-DEP.
Does Cost Segregation Work for a Small Rental?
It can. That same guide covers residential rental property directly. Whether a study pays off on a single-family rental or a small walk-up comes down to four numbers your CPA can estimate:
How much of the price lands in 5-year and 15-year property. A gut-renovated building with new appliances, flooring and site work usually has more of it than a shell.
What the study costs compared with the tax value of pulling deductions forward.
How long you plan to hold. A short hold brings recapture sooner.
Whether passive loss limits let you use the deduction now.
Quality counts too. The guide considers a study high quality when it's both accurate and well documented, and it treats rule of thumb studies with suspicion. Bought your rental in an earlier year? The guide explains that a study can still be applied later as a change in accounting method, generally with Form 3115.
Timing Moves for Late 2026 and 2027
Closing date: close and get a unit ready to rent before December 31 and first-year depreciation can land on the 2026 return. A January closing pushes it to 2027.
Rental license: in Philadelphia, a unit rented for occupancy needs a Rental License, and the license doesn't transfer to a new owner. Max's rental license guide walks through the steps. Start them before closing so the unit isn't sitting empty waiting on paperwork.
The exit: if you might sell in a few years, ask your CPA to estimate recapture now, while it's still just a number on a spreadsheet.
How Max Uses This With Clients
Max isn't a tax advisor, and he won't tell you whether to order a study. His lane is the real estate and the calendar. When an investor buys, he builds the closing timeline with the client's CPA in the loop, so a deal that needs to be in service by December 31 actually gets scheduled that way. He pulls together what a CPA or study provider asks for: the agreement of sale, the closing statement and a list of what conveys. When that same investor sells down the road, he works from the CPA's estimate of recapture and gain, so the pricing and the sale versus exchange decision rest on real net figures. For more on how he works with owners, see Max's landlord services and how he works with investors.
Official Sources
IRS: Notice 2026-11, Interim Guidance on Additional First Year Depreciation
IRS: Treasury and IRS Guidance on the Additional First Year Depreciation Deduction (IR-2026-06)
IRS: Cost Segregation Audit Techniques Guide (Publication 5653)
IRS: Publication 544, Sales and Other Dispositions of Assets (2025)
Pennsylvania Department of Revenue: PA Personal Income Tax Guide, Net Gains (Losses)
FAQ
What is a cost segregation study?
A cost segregation study splits the cost of a rental building into separate assets with their own recovery periods, like 5-year appliances and carpet, 15-year land improvements and the 27.5-year building. The IRS Cost Segregation Audit Techniques Guide explains how examiners review these studies and says the best ones are accurate and well documented.
Is bonus depreciation 100% in 2026?
Yes, for qualified property acquired and placed in service after January 19, 2025, per IRS Publication 946 and Notice 2026-11. That generally means a recovery period of 20 years or less, so a rental's 5-year and 15-year parts qualify and the 27.5-year building doesn't. A binding contract signed before January 20, 2025 falls under older rules.
Does cost segregation work for a small rental or a single-family rental?
Yes, a study can be done on either. The IRS guide even includes a matrix built for residential rental property. Whether it pays depends on how much of the price shifts into 5-year and 15-year property, the study's cost, how long you'll hold and whether passive activity rules limit the loss. Run those numbers with a CPA first.
What is depreciation recapture?
Depreciation recapture is the part of your sale gain taxed because of depreciation you took earlier. On a rental building, straight-line gain is unrecaptured section 1250 gain, taxed at a maximum 25% rate. Gain on personal property like appliances is ordinary income up to the depreciation allowed. A 1031 exchange can defer gain, but section 1245 recapture can still apply.
Maximize Your Return.
