Cost Segregation
Identify assets for tax purposes, optimizing depreciation schedules effectively.
What Is Cost Segregation, and How Does It Work?
When you buy a rental property or a building for your business, tax law lets you deduct its cost a little at a time. This is called depreciation, and it is one of the best benefits real estate offers. The catch is that a standard depreciation schedule stretches those deductions across decades. Cost segregation is a study that speeds them up. It takes your one large purchase and separates it into the many smaller parts inside it. Some of those parts wear out faster than the building shell, so the law lets you write them off much sooner.
Picture the property you just bought as a filled box rather than a single item.
Inside are the land, the structure, the wiring, the flooring, the cabinets, the landscaping, and more.
A cost segregation study, usually performed by engineers and appraisers, assigns a value to each part and places it in the correct tax category. Getting those categories right is where the savings live.
A Simple Way to Understand
Cost Segregation
- Cost Segregation is a tax strategy for people who own a building, like a rental property or business space
- Think of it like taking apart a LEGO set and sorting the pieces, the building is split into parts like carpet, lighting, and cabinets
- Some of those parts wear out faster than the building itself, so the IRS lets you deduct their value much sooner
- Under 2026 law, most of those faster parts can be written off in full the very first year through 100% bonus depreciation
- More deductions up front can free up cash you can use to invest, pay down debt, or buy more property
How Does Depreciation Work on Rental Property?
The clock you use depends on the property type. Residential rental property depreciates over 27.5 years. Nonresidential property, such as an office or a retail building, depreciates over 39 years. Land is treated differently because it never wears out, so you cannot depreciate it at all.
That last point matters more than most owners realize. Since land gives you no deduction, you want as little of your purchase price tied to raw land as the facts support. A cost segregation study helps you document that split with real detail rather than a rough guess.
Cost Segregation Explained
One Purchase, Many Assets
You sign one contract and think you bought a single building. Tax law sees a collection of assets, and each one has its own depreciation clock. A cost segregation study sorts them, so the fast-wearing parts get written off years sooner.
Separates Into
Land
Not DepreciableDepreciation Life
Example value: $80,000
Not DepreciableRaw land that never wears out and never needs replacing.
Land Improvements
15 YearsDepreciation Life
Example value: $20,000
Write Off 100% in Year 1Driveways, sidewalks, landscaping, and fencing.
Personal Property
5 to 7 YearsDepreciation Life
Example value: $100,000
Write Off 100% in Year 1Cabinets, carpeting, appliances, and specialty lighting. These are Section 1245 assets.
Building Structure
27.5 YearsDepreciation Life
Example value: $400,000
Standard ScheduleRoof, foundation, framing, and HVAC. These are Section 1250 assets.
The Result
The Year-One Payoff
The two fast buckets, $20,000 of land improvements and $100,000 of personal property, add up to $120,000 that 100% bonus depreciation lets you deduct in full the first year. Here is how Year 1 compares.
The Five-Year Picture
Across five years the shape becomes clear. Cost segregation loads a large deduction into Year 1, then each following year runs a little below the no-study path, because the fast-life property is already fully written off. The benefit is front-loaded into the year a real estate owner with taxable income tends to feel it most.
Illustrative example. $600,000 four-family residential rental placed in service July 1, under 2026 federal law. State treatment can differ, and Massachusetts decouples from federal bonus depreciation. Educational information only, not tax advice.
Which Parts of My Building Can I Depreciate Faster?
Here is where the study earns its keep. Your purchase breaks into a few tax buckets:
LAND IMPROVEMENTS cover things like driveways, sidewalks, fencing, and landscaping. These wear out and get replaced, so the law gives them a 15-year life.
PERSONAL PROPERTY covers items inside the structure that are not a permanent part of it. Think cabinets, carpeting, certain lighting, appliances, and specialty wiring. The tax code calls these Section 1245 assets, and they carry a 5-year or 7-year life.
THE BUILDING STRUCTURE covers the permanent shell: The roof, the foundation, the framing, and the HVAC system. The code calls these Section 1250 assets, and they stay on the long 27.5-year or 39-year clock.
A study pulls the fast-life items out of the slow-life shell. Without it, most of your cost sits in the 27.5-year or 39-year bucket by default, and you wait decades for deductions you could be taking now.
What Did the One Big Beautiful Bill Act Change for 2026?
This is the part that reshaped the math. The One Big Beautiful Bill Act was signed into law on July 4, 2025. It permanently restored 100% bonus depreciation for qualified property acquired and placed in service after January 19, 2025.
Bonus depreciation lets you deduct the full cost of an eligible item in its first year rather than spreading that cost over time. The rule applies to property with a recovery period of 20 years or less. Your 5-year and 7-year personal property and your 15-year land improvements all fall under that ceiling. Your 27.5-year or 39-year structure sits above it, so the shell stays on the standard schedule.
Put those two ideas together and you see the power. A cost segregation study identifies the short-life property, and bonus depreciation lets you write off 100% of it in year one. The study once spread a modest boost over several years. Under 2026 law, it can drop a large deduction into your very first year of ownership.
How Much Can Cost Segregation Save Me in Year One?
Imagine you pay $600,000 for a four-family rental and place it in service midyear. Your county assigns $100,000 to land, leaving $500,000 for the structure. Without a study, your first-year deduction would be only about $8,000, because the whole $500,000 sits on the 27.5-year clock under the mid-month convention.
Now run a study. Suppose it moves $20,000 into 15-year land improvements and $100,000 into 5-year personal property. That $120,000 now qualifies for 100% bonus depreciation. You deduct all of it in year one, on top of a partial year on the remaining structure. Your first-year deduction climbs from about $8,000 to well over $120,000. For an owner with real taxable income, that swing can turn a good year into an exceptional one.
What About Section 179 and State Taxes?
A few details keep the picture honest.
Section 179 is a separate tool that also lets you expense property up front. For 2026, the deduction limit is $2,560,000, and it begins to phase out once your qualifying purchases pass $4,090,000. It can supplement a cost segregation plan, though it cannot create a loss the way bonus depreciation can.
Bonus depreciation is the default, and you can elect out by property class if spreading deductions over time serves your plan better. That election is worth discussing before you file, since it is locked in once made for the year.
State rules can differ from federal ones. Massachusetts, for example, decouples from federal bonus depreciation for personal income tax purposes, so your state deduction may not match your federal one. In that case you may need to keep a separate state depreciation schedule.
Is a Cost Segregation Study Right for Me?
If you own income property with meaningful taxable income, pulling six figures of deductions into year one can free up cash to pay down debt, reinvest, or buy your next property. The right answer depends on your income, your holding plans, your entity structure, passive activity limits, and your state tax posture. This page is educational information, not tax advice. Speak with an advisor before you act. Visit www.assetstrategy.com/contact if you want to discuss.
