You found the replacement property within 45 days and closed within 180 days. Rather than paying capital gains tax immediately, you deferred the tax and reinvested your equity in a larger, potentially more profitable property. In short, your 1031 exchange, formally known as a like-kind exchange under Section 1031 of the Internal Revenue Code, succeeded.
However, the replacement property carries a more complex tax basis than a property acquired through a traditional purchase. That basis may contain depreciation deductions that many 1031 exchange investors miss entirely.
That’s where a cost segregation study comes in. If you recently completed a 1031 exchange or plan to complete one, talk to your CPA about commissioning a cost segregation study on the replacement property as soon as possible.
Why This Matters
Many investors take a strategic approach to property acquisitions but remain relatively hands-off with their tax planning. They buy the right property at the right price, then depreciate the entire building over the standard 39-year recovery period for commercial property or 27.5-year period for residential rental property.
That approach can carry a significant cost.
A cost segregation study separates certain building components into shorter 5-, 7-, and 15-year depreciation classes. These components may include carpeting, decorative light fixtures, specific electrical systems, parking lot pavement, and landscaping.
Current law allows taxpayers to claim 100% bonus depreciation on qualifying property acquired after January 19, 2025. As a result, investors may deduct eligible assets identified through a cost segregation study during the first year, subject to the applicable tax rules and limitations.
Because a 1031 exchange does not create a conventional purchase-price basis, you must account for different types of basis when conducting the study:
- Carryover basis: The adjusted basis transferred from the relinquished property.
- Excess basis: The additional capital invested above the amount carried into the exchange.
Understanding these amounts helps your CPA and cost segregation provider determine which parts of the replacement property qualify for accelerated depreciation.
1031 Basis Rules
Taxpayers generally have two ways to handle depreciation after acquiring property through a 1031 exchange.
Default Method: Continue the Carryover Basis
Under the default method, you continue using the same depreciation method and convention that applied to the relinquished property. You also depreciate the carryover basis over the remaining recovery period of that property.
Meanwhile, you treat the excess basis as newly placed in service and begin a separate depreciation schedule for that amount.
Under this approach, a new cost segregation study generally applies only to the excess basis. For example, suppose you have a $700,000 carryover basis and a $500,000 excess basis. The cost segregation study would generally apply to the $500,000 excess basis.
Simplified Method: Combine the Basis
Treas. Reg. § 1.168(i)-6(i) allows taxpayers to elect a simplified method. Under this election, you treat the relinquished property as disposed of during the exchange. You then combine the carryover and excess bases into one net tax basis and place that basis in service on the replacement property’s acquisition date.
The simplified method may allow you to apply cost segregation to the entire net tax basis. In the previous example, the study could allocate the full $1.2 million rather than only the $500,000 excess basis.
However, the election does not make the entire combined basis eligible for bonus depreciation. Bonus depreciation generally applies only to qualifying excess-basis components. Cost segregation may still reclassify eligible portions of the carryover basis from a long recovery period into shorter 5-, 7-, or 15-year recovery periods.
Your CPA must determine and report the appropriate depreciation method on your tax return. Therefore, your CPA should calculate the basis before the cost segregation firm finalizes its study.
What This Looks Like
Consider the following example. You sell a warehouse for $2 million with an adjusted basis of $1.2 million. Next, you acquire an apartment complex for $3 million and invest an additional $1 million in cash.
Here is how the two methods could work.
Option 1: Default Method
- The $1.2 million carryover basis remains on its existing depreciation schedule.
- The $1 million excess basis begins a new depreciation schedule.
- Cost segregation generally applies only to the $1 million excess basis.
Option 2: Simplified Method
- You treat the $2.2 million combined net tax basis as placed in service on the acquisition date.
- Cost segregation may apply to the full $2.2 million net tax basis.
- Only qualifying components of the $1 million excess basis generally receive 100% bonus depreciation.
Depending on the property’s type, age, and condition, a standard cost segregation study may reclassify 20% to 35% of the depreciable basis into shorter recovery periods. Applying a 25% allocation to $2.2 million rather than $1 million could create a substantial difference in accelerated depreciation deductions.
Post-1031 Closing Checklist: Talk to Your CPA
Ask for a Basis Breakdown
Request a detailed calculation of your carryover basis, excess basis, and combined net tax basis.
Discuss the Simplified Method Election
Ask whether the election under Treas. Reg. § 1.168(i)-6(i) makes sense for your situation, especially if the transaction includes a significant carryover basis.
Verify the Bonus Depreciation Rules
Current law provides 100% bonus depreciation for qualifying property acquired after January 19, 2025. However, special rules apply to 1031 exchange property, and bonus depreciation generally applies only to qualifying excess-basis components.
Review IRS Publication 946, How to Depreciate Property, with your CPA to determine which assets qualify and which depreciation methods apply.
Complete the Study Promptly
Ideally, complete the cost segregation study during the same tax year in which you place the replacement property in service. Early planning gives your CPA time to review the results and properly report the deductions.
Choose a Firm With 1031 Experience
Select a cost segregation provider that understands carryover basis, excess basis, and the simplified method election. The firm should also communicate directly with your CPA throughout the process.
Why This Combination Is So Powerful
A 1031 exchange defers tax on the sale of a qualifying property. A cost segregation study accelerates depreciation deductions on the replacement property. Together, these strategies may help investors defer taxable gains while increasing near-term deductions.
Neither strategy represents a loophole. Congress created Section 1031 to encourage continued investment in qualifying real estate. Similarly, cost segregation aligns depreciation schedules more closely with the actual useful lives of individual building components.
Of course, execution matters. A qualified firm should prepare an engineering-based study with detailed documentation. Your CPA must also calculate the 1031 basis accurately and evaluate how the chosen depreciation method affects the tax treatment.
This strategy requires coordination between your CPA and a qualified cost segregation firm. In some cases, your qualified intermediary or transaction attorney may also need to participate.
Every property and tax situation differs. The examples in this article illustrate potential outcomes and do not provide personalized tax advice. Consult your CPA or tax advisor before making an election or commissioning a study.
Request a Complimentary Benefit Analysis
Have you completed a 1031 exchange, or are you planning one? Contact us for a complimentary benefit analysis of your replacement property.
We’ll coordinate with your CPA, review the relevant 1031 basis calculations, and estimate how much accelerated depreciation a cost segregation study could generate.
Frequently Asked Questions
Can I Do a Cost Segregation Study on a Property Acquired Through a 1031 Exchange?
Yes. First, ask your CPA whether you will use the default depreciation method or elect the simplified method. That choice determines whether the study may apply only to the excess basis or to both the carryover and excess bases.
Does Bonus Depreciation Apply to the Full Purchase Price of My 1031 Replacement Property?
No. Generally, only qualifying excess-basis components receive bonus depreciation. Electing the simplified method does not make the carryover basis eligible for bonus depreciation.
However, a cost segregation study may still reclassify eligible carryover-basis components into shorter depreciation schedules.
How Soon After My 1031 Closing Should I Commission a Cost Segregation Study?
Ideally, complete the study during the same tax year in which you place the property in service. Finalize the 1031 basis calculations first so the cost segregation firm can use accurate amounts.
This timing can help you claim available accelerated depreciation deductions on your current tax return.
What Happens if My Relinquished Property Already Had a Cost Segregation Study?
Depreciation claimed on the relinquished property affects the carryover basis calculation. However, it does not prevent you from commissioning a new study for the replacement property.
The cost segregation firm will evaluate the replacement property according to its own components, costs, and characteristics.
Are Cost Segregation Studies on 1031 Properties More Likely to Trigger an Audit?
Not necessarily. The IRS evaluates a study based on its methodology, engineering analysis, documentation, and support for the asset classifications.
The IRS Cost Segregation Audit Technique Guide explains the elements of a defensible study. A well-prepared report should include engineering-based asset classifications, cost reconciliation, relevant tax authority, and supporting documentation.
