By David Parks · eXp Realty · The Apollo Group · 3 min read
A cost segregation study is an engineering-based analysis that breaks a rental property into its component parts, so some of them can be depreciated over 5, 7 or 15 years instead of 27.5 or 39. The result can be larger tax deductions earlier, but it is not right for every investor.
The IRS lets owners deduct the cost of a building over time, because buildings wear out. Residential rental property is generally depreciated over 27.5 years and commercial property over 39 years. Land is never depreciated. Normally the whole building is treated as one asset and the deduction is spread evenly over those years.
A specialist, often an engineer or a firm with construction experience, examines the property and sorts its cost into categories. Items like appliances, carpet, certain cabinetry, and specialty lighting may qualify as shorter-life personal property. Exterior items like landscaping, fencing, and paving may qualify as 15-year land improvements. Whatever is left stays in the 27.5 or 39 year bucket.
Shorter recovery periods can mean bigger deductions in the first years you own the property. Some of those shorter-life items may also qualify for bonus depreciation. The percentage allowed has changed several times, so confirm the current rule with your tax professional before you count on it.
Say an investor buys a rental for $600,000 and the land is worth $100,000. That leaves $500,000 of building cost to depreciate. If a study moves $100,000 of that into shorter-life categories, more of the cost can be deducted early instead of being spread over 27.5 years. The exact tax effect depends on the investor’s income, tax bracket, and other factors, so this is an illustration only.
| Key point | What it means |
|---|---|
| Cost | Studies are a paid professional service, and fees vary with property size and complexity. Ask what the study includes and whether it is built to hold up under review. |
| Passive loss rules | Deductions from rentals can be limited if you do not qualify to use them against other income. This is a key question for your CPA. |
| Depreciation recapture | When you sell, some of the depreciation you took can be taxed, and the treatment can differ for shorter-life items. A 1031 exchange may defer some of that tax. See 1031 Exchange Basics for Real Estate Investors. |
| Your own home | Cost segregation is for investment and business property, not a primary residence. |
| State rules | States can treat bonus depreciation and other federal rules differently. |
A study changes your taxes, not the property’s income. Cap rate and cash flow stay the same. Use Cap Rate Explained and Cash-on-Cash Return Explained to judge the deal first, then ask your CPA whether a study adds value. For a full picture of ongoing costs, see the Rental Property Expenses Checklist.
Tax rules change and every investor’s situation is different. Before commissioning a study, review it with a CPA who works with real estate investors. David can talk through the property side, including purchase price, finishes, and hold period, and connect you with Denver-area professionals.
General information based on IRS depreciation concepts for residential rental and commercial property, as understood in November 2026. This article is not tax advice.
This article is general information, not legal, tax, financial or inspection advice. Every home and situation is different, so confirm details with a licensed inspector, lender, attorney or tax professional.
David is a Greater Denver real estate advisor with eXp Realty and The Apollo Group (Colorado broker license FA100103211). He has closed more than $55 million in volume, earned eXp Icon status in 2025, and holds a 5.0 rating on Zillow from 27 verified reviews.
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