For three years, U.S. real estate investors watched the bonus-depreciation rate phase down — 100% in 2022, 80% in 2023, 60% in 2024, on track to hit 0% in 2027. Then, in early 2025, Congress passed the One Big Beautiful Bill Act (OBBBA), restoring 100% first-year bonus depreciation on qualifying property acquired and placed in service after January 19, 2025.
That change is the single biggest shift in real-estate tax planning since the original Tax Cuts and Jobs Act in 2017. Here’s what it actually means — and why cost segregation studies are suddenly worth more than they have been in three years.
What “100% bonus depreciation” actually means
Bonus depreciation is an additional first-year deduction on top of the regular MACRS schedule. Under the restored OBBBA rules, every dollar of qualifying property — meaning property with a MACRS recovery period of 20 years or less — can be deducted entirely in year one, instead of spread out over its normal recovery period.
For a commercial real-estate investor, that’s the difference between depreciating a $200,000 piece of qualifying property:
- Without bonus depreciation: ~$5,128 per year for 39 years
- With 100% bonus depreciation: $200,000 in year one
That’s a forty-fold acceleration of the deduction — with all the time-value-of-money benefits that come with it.
The catch: what counts as “qualifying property”?
This is where cost segregation comes in. The building shell itself doesn’t qualify — commercial real estate is on a 39-year recovery period, residential rental on 27.5 years, both well above the 20-year cutoff. So if all you do is buy a building and depreciate it straight-line, none of it benefits from bonus depreciation.
But every commercial building isn’t actually one asset — it’s hundreds. And many of those components have shorter recovery periods that do qualify:
- 5-year personal property: carpet, decorative lighting, removable fixtures, kitchen equipment, specialty plumbing, security and AV systems
- 7-year personal property: office furniture, certain manufacturing equipment
- 15-year land improvements: paving, fencing, landscaping, site lighting, retaining walls, signage
An engineering-based cost segregation study identifies and itemizes every one of those components, then assigns them to the correct MACRS class life. The study’s output is what your CPA uses to claim the accelerated deductions.
The math on a $2M commercial property
Without cost segregation: ~$51,282 first-year depreciation (straight-line). With cost segregation reclassifying 25% of basis into 5- and 15-year property + 100% OBBBA bonus: ~$451,282 first-year deduction — about $400K more in year one. At a 37% federal bracket, that’s roughly $148,000 of tax saved in cash, kept in the investor’s pocket today instead of slowly recovered over four decades.
Who benefits most from OBBBA?
Three categories of property owners stand to gain the most:
- New acquisitions in 2025+. If you bought a property after January 19, 2025, you’re directly in the new bonus-depreciation regime. A study completed before you file can capture the full first-year deduction.
- Properties placed in service since 2023. Bonus depreciation was 80% in 2023 and 60% in 2024. Those rates apply to the year the property was placed in service, not the year of the study.
- High-income investors with passive losses. The bigger your tax bill, the more valuable each dollar of accelerated deduction. Real estate professionals and short-term rental hosts (the “STR strategy”) can typically use the full deduction immediately against W-2 or active business income.
What about state taxes?
Most U.S. states do not conform fully to federal bonus depreciation. California, New York, and a handful of others “decouple” — meaning a TDA cost segregation study models both books separately, so your CPA can file federally and at state level without timing distortions. Some no-income-tax states (Texas, Florida, Nevada, Tennessee, Washington, etc.) sidestep the issue entirely.
How long do you have?
OBBBA sunsets are not yet legislated, but historically Congress has used bonus depreciation as an economic-stimulus dial. The current 100% rate is the most generous treatment available in the past three years. The longer you wait to commission a study, the longer your accelerated deductions sit unrealized — and the closer the tax planning window gets to the next legislative cycle.
The bottom line
OBBBA didn’t change cost segregation methodology — the engineering rigor, the MACRS class lives, the IRS Cost Segregation Audit Techniques Guide are all the same as they were before. What changed is the dollar value of the output. A study that produced 60 cents on the dollar of accelerated deduction in 2024 now produces a dollar.
If you own commercial real estate or rental property in the U.S. and you have not commissioned a study, OBBBA is the reason to start one now. The math hasn’t been this generous since the 2022 tax year, and the engineering work doesn’t care which calendar year you do it in — the deductions are tied to when the property was placed in service.
Talk to your CPA. Talk to us. Or run the numbers on our free estimate calculator below and see what your specific property would yield.