You can accelerate depreciation on a rental property by commissioning a cost segregation study that breaks the building into components with 5-year, 7-year, and 15-year recovery periods, and then, for property acquired after January 19, 2025, claiming 100% bonus depreciation on those components in the first year. Instead of writing off a residential rental over 27.5 years or a commercial building over 39, you pull out the pieces that qualify for faster treatment and deduct them much sooner. The result is a larger deduction early in ownership, lower taxable income, and better cash flow.
How Cost Segregation Shortens the Recovery Period
A building is not a single asset for tax purposes. The Modified Accelerated Cost Recovery System (MACRS) sorts depreciable property into classes by useful life, and a cost segregation study identifies which parts of your building belong in the shorter classes rather than the long building-shell schedule.
For a residential rental, the relevant faster categories are:
- 5-year property: appliances, carpeting, and furniture used in the rental activity, plus items like decorative lighting and window treatments.1Internal Revenue Service. Publication 527 (2025), Residential Rental Property
- 7-year property: office furniture and fixtures such as desks, filing cabinets, and safes. Property without a designated class life also defaults here.2Internal Revenue Service. Publication 946 (2024), How To Depreciate Property
- 15-year property: land improvements including fences, sidewalks, roads, shrubbery, and other features added to the land.2Internal Revenue Service. Publication 946 (2024), How To Depreciate Property
Everything left over, meaning the roof, load-bearing walls, plumbing, HVAC ductwork, and other structural elements, stays on the 27.5-year residential schedule or the 39-year nonresidential schedule.1Internal Revenue Service. Publication 527 (2025), Residential Rental Property The value of the strategy comes from how much of a typical building’s cost actually sits in the faster buckets. Cabinets, dedicated electrical circuits for appliances, landscaping, and parking areas can add up to 20% to 40% of a property’s depreciable basis, depending on the building.
To depreciate anything at all, you have to own the property, use it in a trade or business or for the production of income, and have placed it in service, meaning it is ready and available for its intended use.2Internal Revenue Service. Publication 946 (2024), How To Depreciate Property3Internal Revenue Service. Topic No. 704, Depreciation A personal residence does not qualify. A building counts as residential rental property only if 80% or more of its gross rental income comes from dwelling units, which is why hotels and motels sit under the nonresidential 39-year schedule.4Legal Information Institute. 26 USC 168(e)(2) – Definition of Residential Rental Property
Bonus Depreciation After the One Big Beautiful Bill Act
Reclassifying components into shorter recovery periods matters even more once bonus depreciation is layered on top. For qualified property acquired and placed in service after January 19, 2025, federal law now allows a 100% first-year deduction.5Internal Revenue Service. One Big Beautiful Bill Provisions The One Big Beautiful Bill Act restored full bonus depreciation and ended the phase-down that had been shrinking the allowance each year since 2023.
Say a cost segregation study on a building you acquired in mid-2025 identifies $200,000 of 5-year and 15-year property. Instead of spreading that $200,000 across 5 or 15 years, you deduct the whole thing in year one.
Bonus depreciation applies to property with a MACRS recovery period of 20 years or less, which covers everything a study typically pulls out.6Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System It does not apply to the building shell, which stays on its 27.5-year or 39-year straight-line schedule regardless.
The acquisition date is a hard cutoff. If you acquired the property before January 20, 2025, but place reclassified components in service during 2026, the bonus depreciation rate falls to 20%.6Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System Cost segregation still helps existing owners by shortening the recovery period, but the first-year hit is much smaller than what post-cutoff buyers can claim.
Will the Loss Actually Reduce Your Tax Bill?
A large first-year deduction can create a paper loss on the property. Whether that loss offsets your wages and other active income depends on the passive activity rules. Rental activities are generally passive, meaning the losses can only offset other passive income, not your salary or business profits.
One partial exception exists at the individual level. If you actively participate in managing your rental, you can deduct up to $25,000 in rental losses against non-passive income each year. Active participation is a lower bar than material participation: making management decisions, approving tenants, and setting rental terms qualifies. The $25,000 allowance phases out as modified adjusted gross income climbs past $100,000 and disappears entirely at $150,000. Filing married filing separately while living apart from your spouse for the full year cuts those thresholds in half.7Internal Revenue Service. Publication 925 (2025), Passive Activity and At-Risk Rules
Losses you cannot use in the current year are not lost. They carry forward, offset passive income in later years, and become fully deductible when you sell the property in a taxable transaction.
Real Estate Professional Status
The passive limits fall away entirely if you qualify as a real estate professional. Two tests apply during the tax year: more than half of the personal services you perform across all trades or businesses must be in real property businesses in which you materially participate, and you must log more than 750 hours in those activities.7Internal Revenue Service. Publication 925 (2025), Passive Activity and At-Risk Rules On a joint return, you cannot combine spousal hours to meet the 750, though a spouse’s work on a particular rental can count toward material participation in that activity.
For someone who qualifies, cost segregation and bonus depreciation together can throw very large deductions against wages and other active income. That combination is the reason the real estate professional designation gets so much attention among full-time investors.
When a Study Is Worth Paying For
A cost segregation study is an engineering-based analysis: an engineer catalogs qualifying components, assigns each to the correct MACRS class, allocates a portion of your basis to each, and delivers a report that documents the reclassification.8Internal Revenue Service. Publication 5653, Cost Segregation Audit Techniques Guide That report is your defense if the IRS challenges the deductions.
Fees for residential rental studies range from a few hundred dollars for smaller properties using data-driven methodologies to several thousand for larger buildings that need an on-site inspection. As a rough guideline, properties with a depreciable basis below roughly $400,000 to $500,000 often do not hold enough reclassifiable value to justify the cost. Higher property values, more interior finishes, and more site improvements all push the math in favor of doing the study.
Applying Cost Segregation to a Property You Already Own
You do not have to catch this at purchase. If you already placed the property in service in a prior year and have been depreciating it the standard way, you can switch to the accelerated method by filing IRS Form 3115, Application for Change in Accounting Method. The original attaches to your timely filed federal return for the year of the change, and a signed duplicate goes to the IRS National Office in Ogden, Utah, no earlier than the first day of the year of the change and no later than the date you file the original.9Internal Revenue Service. Instructions for Form 3115 (Rev. December 2022)10Internal Revenue Service. Where To File Form 3115
The change triggers a Section 481(a) adjustment, which reconciles the depreciation you actually claimed under the old method with what you would have claimed under the new one. Because you have been underdeducting, the adjustment is negative and the entire catch-up amount is deductible in the year of the change rather than spread out.9Internal Revenue Service. Instructions for Form 3115 (Rev. December 2022) Individual landlords report the adjustment on Schedule E; partnerships use Form 8825. You do not amend prior returns.
When you place a new property in service and run the study in the same year, Form 3115 is not needed. The reclassified components simply appear on your depreciation schedule from the start.
What Happens When You Sell: Depreciation Recapture
Faster deductions today mean recapture later. When you sell, the IRS requires you to recapture the depreciation you claimed, and the rate depends on the type of property.
Depreciation on the building itself and its structural components falls under the unrecaptured Section 1250 gain rules, taxed at a maximum federal rate of 25%.11Internal Revenue Service. Topic No. 409, Capital Gains and Losses12Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed That is higher than the 0% to 20% long-term capital gains rate that applies to the rest of the profit.
Depreciation on personal property components reclassified through cost segregation, like appliances, carpeting, and furniture, is recaptured as ordinary income under Section 1245.13Office of the Law Revision Counsel. 26 USC 1245 – Gain From Dispositions of Certain Depreciable Property Ordinary rates can reach 37%, which can make Section 1245 recapture more expensive per dollar than the 25% ceiling on the building. The counterweight is timing: you got those deductions years earlier, and the time value of that money often outweighs the eventual recapture cost.
Recapture applies regardless of how long you held the property. Holding longer than a year does not eliminate it. The most common way to defer both the capital gain and the recapture is a like-kind exchange under Section 1031, which rolls the tax exposure into the replacement property. If a sale is on the horizon, running the after-tax numbers, with recapture included, is the only way to see what accelerated depreciation actually leaves in your pocket.