Cost Segregation 101: What 100% Bonus Depreciation Means for Investors
By Michelle Clardie on 02/10/2026.
Reviewed by Josefin Gatsby
Cost segregation is a strategic planning tool that significantly reduces taxable income when purchasing or developing buildings for business or investment use.
While cost segregation has been around since the 1980s, starting with the Accelerated Cost Recovery System (ACRS) of 1981, legislative changes in 2025 have created even greater benefits for today’s real estate investors.
In this article, we’ll give you an intro to cost segregation, including:
What cost segregation is,
How the rules changed in 2025,
The benefits of cost segregation with bonus depreciation,
And how you can take advantage of this strategy, with or without directly buying property.
Consider this your crash course in cost segregation.
What is Cost Segregation?
In simple terms, cost segregation is a tax strategy that allows property owners to depreciate certain components of a building over shorter time periods, rather than the standard depreciation schedule.
If you’re not yet familiar with property depreciation, it is a tax deduction based on the idea that the average structure only has so many years before it needs to be replaced. This period of time is called the useful life of the structure. The IRS has determined that, for tax purposes, the useful life of a rental property is 27.5 years and the useful life of a commercial property is 39 years. So, under standard property depreciation, you could deduct 3.64% of the rental structure’s value at the time of purchase per year from your taxable income (1 year / 27.5 years = 3.64%). Important: depreciation applies to the structure only. The value of the land is not depreciable.
Now, with cost segregation, you can break components with shorter useful life timelines out of the standard schedule and depreciate them more quickly. This allows you to accelerate the depreciation, essentially front-loading your tax benefits so you don’t have to wait so long to receive them.
To do this, you would first hire a company to conduct a cost segregation study. This study would determine how much of the property qualifies for accelerated depreciation, and on what schedule.
For example:
Interior finishes, such as flooring, cabinetry, and light fixtures, can be depreciated over five years.
Specialty equipment, machinery, and office furnishings can be depreciated over seven years.
Land improvements that are not part of the main building can be depreciated over 15 years. This includes fencing, paving, and detached storage structures.
How 100% Bonus Depreciation Changes Cost Segregation
Back in 2017, the Tax Cuts and Jobs Act temporarily allowed investors to claim 100% bonus depreciation on the components that qualified for cost segregation. This meant investors could deduct the full depreciation amount of eligible components in the first year of ownership or construction, rather than spreading the amount over 5, 7, and 15 years.
The intention was to incentivize investors to buy, build, and improve income-generating properties by giving them enormous upfront tax benefits.
Properties placed in service between September 28, 2017, and December 31, 2022, qualified for this 100% bonus depreciation. Then there was a step-down period: properties placed in service in 2023 qualified for 80% bonus depreciation, and properties placed in service in 2024 qualified for 60% bonus depreciation.
The step-down period was scheduled to go through 2026, but then, the One Big Beautiful Bill Act (OBBBA) restored 100% bonus depreciation indefinitely.
So, properties placed in service on or after January 20, 2025, qualify for 100% bonus depreciation on cost segregated components.
Example of Tax Savings from Cost Segregation with 100% Bonus Depreciation
Let’s explore how cost segregation with 100% bonus appreciation could reduce tax liability.
Imagine a real estate investment company purchasing a property worth $3 million in 2026. The land is valued at $1 million, and the structure is valued at $2 million. Remember, only the structure is depreciable.
A cost segregation study finds that 30% of the structure is eligible for accelerated depreciation. While these components would normally be depreciated over 5, 7, or 15 years, they now qualify for immediate depreciation in year one under the 100% bonus depreciation legislation. So the company gets to deduct $600,000 from its federal taxable income this year through this one strategy.
If the company earned $800,000 in taxable income for the year (after accounting for all other deductions), it might only pay federal taxes on $200,000 of that income thanks to cost segregation with bonus depreciation.
Benefits of Cost Segregation with 100% Bonus Depreciation for Real Estate Investors
As a real estate investor, you can use cost segregation with 100% bonus depreciation for:
Immediate tax relief. This strategy allows you to dramatically reduce your taxable income in the first year of owning or developing an income-producing property.
Increased cash flow. Because less of the property’s income will go toward taxes, the cash flow automatically increases.
Ability to reinvest savings. Reducing your tax liability frees up cash that would have gone toward taxes to purchase additional assets.
Strategic planning in high-income years. You can time your acquisitions and developments for years in which you expect higher-than-normal earnings (like a year in which you sell an investment property, for example).
Important Rules of Cost Segregation with 100% Bonus Depreciation
As you consider whether cost segregation with bonus depreciation would work for you, keep the following rules in mind:
The property must be strictly business-use/investment. Primary residences and vacation homes don’t apply.
The property must be placed in service during an eligible bonus-depreciation period. Timing determines whether 100% expensing is available.
A formal cost segregation study is required. If you previously placed the property in service without a cost segregation study, you can generally perform a “look-back” study and catch up on missed depreciation.
You must follow all relevant IRS guidelines. Have a tax accountant confirm compliance.
Only eligible components of the structure qualify for bonus depreciation. The structure and its “permanent” elements still use standard depreciation, and land is not depreciable at all.
This tax strategy specifically applies to federal income taxes. State tax law varies.
The depreciation you claim can be recaptured by the IRS if you sell the property at a profit. However, depreciation recapture can be deferred through a 1031 exchange.
If you acquire property from a related party, inherit it, or receive it as a gift, bonus depreciation may be disallowed. The purchase must generally be an arm’s-length transaction.
Passive activity loss rules may limit your ability to use the deduction immediately. Unless you qualify as a real estate professional or have sufficient passive income to offset the depreciation loss, that is.
How to Capitalize on this Strategy
If you’re a high earner (or have a particularly profitable year), you may be facing a large income tax bill. But because of the upfront tax savings of cost segregation with bonus depreciation, you can offset some of that tax bill while walking away with an income-generating asset that is likely to appreciate over time.
The most direct method of capitalizing on this strategy is to buy a rental property. And one of Gatsby Investment’s newly constructed multi-family properties might be the right property for your portfolio.
Gatsby specializes in developing smaller residential buildings with 4-6 units. Compared to larger buildings, these structures are easier to permit, faster to build, more manageable, more affordable, and easier to finance. The tax savings could potentially cover the down payment and closing costs, allowing you to invest in a stabilized asset rather than pay a large income tax bill.
While the OBBBA has restored 100% bonus depreciation indefinitely, laws are always subject to change. Make sure you take advantage of this tax-saving opportunity while you can! Explore Gatsby’s for-sale properties, and expand your tax-advantaged real estate portfolio today.
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