Real Estate
Cost Segregation Study: How It Saves You $40,000-$80,000 in 2026
A cost segregation study is an engineering-based analysis that reclassifies components of your rental property into shorter depreciation categories. Instead of depreciating your entire building over 27.5 or 39 years, a cost seg study identifies assets like flooring, landscaping, appliances, and electrical systems that qualify for 5, 7, or 15-year depreciation. Combined with bonus depreciation, this lets you accelerate tens of thousands of dollars in deductions into year one, dramatically reducing your current-year tax bill.
Who Qualifies
- Own residential or commercial rental property
- Property cost basis of $500K+ (below this, cost seg fees may exceed savings)
- Placed in service in the current or recent tax years
- Property has not already been fully depreciated
- Works for both new purchases and properties held for years (catch-up via Form 3115)
Who does NOT qualify
- Primary residence only (no rental activity)
- Properties with cost basis under $250K (marginal ROI)
- Tax-exempt entities that don't pay income tax
How the Math Works
Cost seg reclassifies $165,000 of the $750K property into 5/7/15-year categories. With 40% bonus depreciation (2026 OBBBA rate), they can accelerate ~$66,000 in depreciation to year one.
At a 37% federal marginal rate, this generates approximately $24,400-$61,000 in year-one federal tax savings, depending on their specific property components and whether they qualify for REP status to unlock passive loss deductions against W-2 income.
Legal Basis & IRC Citations
- IRC §168: Accelerated Cost Recovery System (MACRS)
- IRC §168(k): Bonus depreciation (40% in 2026 under OBBBA phase-down, restored to 100% for certain assets under OBBBA §13201)
- IRC §179: Election to expense certain depreciable assets
- IRS Rev. Proc. 87-56: Asset class lives and recovery periods
OBBBA Update: OBBBA restored 100% bonus depreciation for qualified property placed in service after January 20, 2025. This reverses the phase-down that reduced bonus depreciation to 80% (2023), 60% (2024), and 40% (2025). For 2026 returns, 100% bonus depreciation applies to cost seg reclassified assets.
State Notes: California does NOT conform to federal bonus depreciation. CA taxpayers must add back the bonus depreciation difference on their state return. Your federal savings are unaffected, but state savings will be calculated using standard MACRS rates. New York conforms. Texas and Washington have no state income tax.
What to Tell Your CPA
“I had a cost segregation study done on my rental property at [address]. The study reclassified $[amount] into 5, 7, and 15-year property. I'd like to claim 100% bonus depreciation on the reclassified assets under OBBBA §13201. Can you confirm the depreciation schedule and file Form 3115 if this is a catch-up year?”
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Frequently Asked Questions
How much does a cost segregation study cost?
A typical cost seg study costs $5,000-$15,000 depending on property size and complexity. For a $750K+ property, the study typically pays for itself 5-10x over in year-one tax savings alone. Many cost seg firms offer a free preliminary analysis to estimate your savings before you commit.
Can I do a cost segregation study on a property I've owned for years?
Yes. You can perform a "look-back" cost seg study on any property you still own and depreciate. Your CPA files Form 3115 (Change in Accounting Method) to claim the catch-up depreciation in a single year, no need to amend prior returns.
Does cost segregation work for short-term rentals?
Absolutely. STR properties are some of the best candidates for cost seg because the furnishings, appliances, and improvements in a vacation rental often represent a larger percentage of the total property value than a traditional long-term rental. Combined with material participation (7-day average stay), STR owners can often deduct these losses against W-2 income.
What happens to my depreciation if I sell the property?
Depreciation recapture applies at a 25% rate on the amount of depreciation claimed (IRC §1250). However, many investors use a 1031 exchange to defer both capital gains and depreciation recapture. The net present value of accelerating deductions today typically far exceeds the future recapture cost.
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