Why 2026 Is the Best Year in a Decade to Combine These Two Strategies
Two of the most powerful tax tools available to real estate investors have converged in 2026 in a way that has not existed since before the Tax Cuts and Jobs Act of 2017. The first is the 1031 exchange, which has survived every tax reform attempt and remains fully intact under Section 1031 of the Internal Revenue Code. The second is 100% bonus depreciation, which was scheduled to phase out but was made permanent by the One Big Beautiful Bill Act signed in July 2025.
When used together, these two strategies allow an investor to defer all capital gains taxes on the sale of an appreciated property through the exchange, then immediately generate a massive first-year depreciation deduction on the replacement property through a cost segregation study. The result is a double tax benefit that can produce a net tax position of zero or even a paper loss in the year of acquisition.
This is not a loophole. It is the intended result of two separate provisions of the Internal Revenue Code working in tandem. But it requires careful planning, proper sequencing, and the right team of professionals.
What Is a Cost Segregation Study?
A cost segregation study is an engineering-based tax analysis that identifies and reclassifies components of a building from the standard 27.5-year (residential) or 39-year (commercial) depreciation schedule to shorter 5-year, 7-year, or 15-year schedules.
When a building is purchased, the IRS treats the entire structure as a single asset with a long depreciation life. But a building is actually composed of dozens of distinct components, many of which wear out or become obsolete much faster than the structure itself. Carpeting, appliances, specialty lighting, parking lot surfaces, landscaping, and certain plumbing fixtures all qualify for accelerated depreciation.
A cost segregation study, performed by a qualified engineer, identifies these components and assigns them to the correct asset class. The result is a front-loaded depreciation schedule that generates significantly more deductions in the early years of ownership.
How Permanent 100% Bonus Depreciation Changes the Math
Before the One Big Beautiful Bill Act, bonus depreciation was scheduled to phase down from 80% in 2023 to 60% in 2024 to 40% in 2025 and eventually zero. Many investors were timing their cost segregation studies around these phase-down percentages.
The OBBBA made 100% bonus depreciation permanent for property acquired and placed in service after January 19, 2025. This means that every component identified by a cost segregation study as having a useful life of 20 years or less can now be fully deducted in the first year of ownership, with no phase-down.
For a $2 million replacement property, a cost segregation study might identify $400,000 to $600,000 in components eligible for 5-year or 15-year depreciation. Under 100% bonus depreciation, that entire amount is deductible in year one. At a 37% federal tax rate, that is a $148,000 to $222,000 tax benefit generated in the first year alone, on top of the capital gains deferral from the exchange itself.
The Sequencing: How to Combine a 1031 Exchange With Cost Segregation
The combination works as follows. You sell your relinquished property and defer all capital gains taxes through a properly structured 1031 exchange. You acquire the replacement property within the 180-day exchange period. After closing on the replacement property, you commission a cost segregation study on that property. The study identifies components eligible for accelerated depreciation. You claim 100% bonus depreciation on those components in the year of acquisition.
The key sequencing requirement is that the cost segregation study must be performed on the replacement property, not the relinquished property. You cannot use cost segregation to generate deductions on a property you are selling. The strategy is entirely forward-looking.
There is also an important interaction with the 1031 exchange's carryover basis rules. When you acquire a replacement property through a 1031 exchange, your basis in the replacement property is generally the same as your basis in the relinquished property, adjusted for any boot received or paid. This carryover basis affects the total depreciation available over the life of the property, but it does not affect your ability to claim 100% bonus depreciation on the components identified in the cost segregation study.
What Types of Replacement Properties Benefit Most?
Not all replacement properties produce the same cost segregation benefit. The properties that generate the largest first-year deductions are those with a high ratio of personal property and land improvements to the total purchase price.
Multifamily apartment complexes typically yield cost segregation benefits of 20% to 30% of the purchase price, because they contain significant quantities of appliances, carpeting, and specialty fixtures. Commercial properties such as retail centers and industrial warehouses can yield 15% to 25%, depending on the build-out. NNN triple-net properties with minimal interior improvements typically yield lower percentages, in the 10% to 15% range.
The property's age also matters. Newer properties have not yet been depreciated, so the full purchase price is available for analysis. Older properties that have already been depreciated by a prior owner may have a lower depreciable basis, reducing the benefit.
The Role of Your Qualified Intermediary
Your qualified intermediary plays a critical role in ensuring the 1031 exchange is properly structured before the cost segregation strategy is layered on top. The exchange must be completed correctly, with the exchange agreement in place before the sale of the relinquished property, the proceeds held by the QI throughout the exchange period, and the replacement property identified and acquired within the IRS timelines.
If the exchange fails for any reason, the capital gains taxes become due immediately, and the cost segregation deductions cannot offset a tax bill that was supposed to have been deferred. The sequence matters: the exchange must succeed first.
1031 Federal Exchange works with investors and their CPAs to coordinate the exchange timeline with the cost segregation study. We can refer you to qualified cost segregation engineers and help ensure the exchange is structured to support the full tax strategy.
Frequently Asked Questions
Can I do a cost segregation study on a property I acquired through a 1031 exchange? Yes. A 1031 exchange does not affect your ability to commission a cost segregation study on the replacement property. The study is performed after acquisition and generates depreciation deductions based on the components of the replacement property.
Does the carryover basis from a 1031 exchange reduce my cost segregation benefit? The carryover basis reduces your total depreciable basis in the replacement property, which affects the overall depreciation available over the life of the property. However, the 100% bonus depreciation applies to the components identified in the cost segregation study based on their allocated value, not the carryover basis of the entire property. Your CPA can calculate the exact benefit based on your specific situation.
Is 100% bonus depreciation permanent? Yes. The One Big Beautiful Bill Act, signed in July 2025, made 100% bonus depreciation permanent for property acquired and placed in service after January 19, 2025.
Do I need to do a cost segregation study immediately after closing? The study can be performed at any time after acquisition, but the bonus depreciation deduction is claimed in the year the property is placed in service. To maximize the first-year benefit, commission the study as soon as possible after closing.
What does a cost segregation study cost? Fees vary by property type and size, but typically range from $5,000 to $15,000 for a residential or small commercial property. For larger commercial properties, fees can be higher. The cost of the study is itself a deductible business expense.
Contact 1031 Federal Exchange for a free consultation. We can help you structure your exchange to support a cost segregation strategy and connect you with the right professionals to maximize your tax benefit in 2026.