If you bought a Texas residential rental property several years ago, you might assume the opportunity to benefit from cost segregation has passed.
That conclusion can be premature, as a look-back cost segregation study can revisit property already placed in service, identify components with shorter recovery periods, then calculate depreciation that should have been claimed under a supported classification. For residential rental property, the building itself generally follows a 27.5-year recovery period under the applicable MACRS rules, while qualifying components can have shorter recovery periods.
The IRS published an updated Cost Segregation Audit Techniques Guide in February 2025, giving taxpayers and practitioners current evaluation guidance. For you as a property owner, that means an older acquisition can still deserve a fresh depreciation review when the numbers justify the work.
Evaluating property acquired in earlier years
Working with Texas cost segregation specialists can help you examine an older property’s original basis, particularly when the residential rental contains substantial electrical systems, plumbing, flooring, millwork, specialty lighting, parking improvements, landscaping or other components.
A quality study typically reviews acquisition documents, construction records, blueprints, engineering information, depreciation schedules and the property’s use, so each classification has factual support.
The IRS recognizes cost segregation as a method for identifying assets with different recovery periods, which can accelerate deductions when shorter-lived components qualify under the applicable rules. Your goal is a defensible allocation of original costs that matches the required tax treatment.
What a look-back study actually changes
A look-back study applies cost segregation to property that you acquired and placed in service during an earlier tax year, so the analysis starts with historical facts without relying on today’s property value.
The study reviews the original depreciable basis, identifies qualifying components, then calculates the depreciation that should have been recognized through the year before the accounting method change. This distinction matters, as a study does not create a deduction from current market value.
A change from an impermissible method of computing depreciation to a permissible method produces a section 481(a) adjustment. Where components were previously depreciated over the building’s recovery period rather than their own shorter recovery periods, the corrected classification can produce a negative adjustment for depreciation that was allowable but not claimed. By contrast, a change from one permissible method to another permissible method produces no section 481(a) adjustment and is implemented on a cut-off basis.
Why Form 3115 matters
Form 3115, Application for Change in Accounting Method, is generally used when you change the accounting treatment of an item or change an overall accounting method. IRS guidance specifically identifies changes involving depreciation methods, recovery periods and conventions as accounting method changes in qualifying circumstances.
For a look-back study, your tax professional must determine the applicable automatic change procedure, then complete the required depreciation schedules and supporting statements. Current IRS instructions require Schedule E for applicants changing an accounting method for depreciation or amortization.
Automatic changes generally do not require a user fee, with eligibility and filing requirements still applying. This process can let you address the accounting method change on the current return without reopening every prior return involved.
Understanding the section 481(a) adjustment
The section 481(a) adjustment reconciles the depreciation you actually claimed with the depreciation that should have been claimed under the corrected accounting method through the beginning of the year of change.
In the ordinary cost segregation situation described here, the relevant issue is generally a move from an impermissible method to a permissible method. If qualifying components were previously depreciated over the residential building’s 27.5-year recovery period even though they belonged in shorter recovery periods, the resulting negative section 481(a) adjustment can bring previously allowable but unclaimed depreciation into the year of change.
A different rule applies when the existing method was already permissible. A change from one permissible method of computing depreciation to another permissible method does not produce a section 481(a) adjustment and is implemented on a cut-off or modified cut-off basis under the applicable rules.
A worked example of catch-up depreciation
Consider a Texas investor who acquires a residential rental property for $3,150,000, of which $450,000 is allocated to land, leaving a depreciable building basis of $2,700,000. The investor separately purchases $65,000 of furniture, fixtures and equipment. The property is placed in service in January. Without a cost segregation study, the building is depreciated over 27.5 years and the first-year deduction under the mid-month convention is $94,095; the separately purchased FF&E receives 100% bonus depreciation of $65,000 whether or not a study is performed, for a total of $159,095. With a study, $378,000 is reclassified to five-year personal property and $243,000 to 15-year land improvements, giving $621,000 of accelerated basis eligible for 100% bonus depreciation. The remaining $2,079,000 stays on the 27.5-year schedule and produces $72,453 in year one. Adding the $65,000 of FF&E, the first-year deduction is $758,453. The study’s incremental contribution is $599,358, which at a 37% marginal federal rate defers roughly $221,762 of tax.
The example illustrates why the distinction between the building and shorter-lived components matters. The study does not increase the property’s original cost or create an artificial deduction. It changes the classification of qualifying costs when the underlying facts and tax rules support that treatment.
Passive activity limits can affect the benefit
These deductions are not automatically usable. Under IRC Sec. 469, rental real estate is generally a passive activity, and passive losses offset only passive income; unused losses are suspended and carried forward until the taxpayer has passive income or disposes of the activity in a fully taxable transaction. A taxpayer who qualifies as a real estate professional under Sec. 469(c)(7) and materially participates may treat the losses as non-passive. Separately, a rental with an average guest stay of seven days or less is not a rental activity under Reg. Sec. 1.469-1T(e)(3)(ii)(A), so material participation alone can make the losses non-passive without real estate professional status.
The practical point is that a large depreciation deduction does not automatically translate into the same amount of immediately usable tax savings. Your tax position, participation and the property’s specific use all matter when assessing the value of a look-back study.
Depreciation recapture and current law
Accelerated depreciation is a deferral, not forgiveness. On a taxable sale, depreciation claimed on the five- and 15-year property a study reclassifies is recaptured under IRC Sec. 1245 as ordinary income to the extent of depreciation taken, potentially at rates up to 37%, rather than the 25% maximum applying to unrecaptured Sec. 1250 gain on the building itself. A study therefore shifts part of future gain from Sec. 1250 to Sec. 1245 treatment. The net benefit depends on the time value of the deferral and the expected holding period, and is generally weaker for property expected to be sold within a few years.
The One Big Beautiful Bill Act (P.L. 119-21), signed July 4, 2025, made the 100% first-year bonus depreciation rate under IRC Sec. 168(k) permanent for qualifying property acquired and placed in service on or after January 20, 2025. Before that change the rate was phasing down on a fixed schedule of 80%, 60%, 40%, 20% and then 0%. Property acquired before January 20, 2025 remains subject to the phase-down percentage in effect at the time of acquisition.
The current rules do not mean that every older property automatically receives the current 100% rate. A look-back study must distinguish assets according to their own acquisition and placed-in-service facts. This historical analysis matters when you want to understand how much depreciation was missed, how much can be recognized through the accounting method change and which assets qualify for accelerated treatment.
When a look-back study can make sense
A look-back study may be worth considering when your Texas multifamily residential rental property has a substantial basis, improvements or many components depreciated using the 27.5-year building recovery period. You should also weigh the study’s professional cost, documentation quality, current taxable income, ownership structure, prior depreciation and plans for a future sale.
The IRS expects cost segregation studies to provide sufficient detail to support the classifications and calculations used for depreciation deductions. If you acquired a Texas residential rental property years ago and have always depreciated the building using its standard recovery period, a prepared study could uncover depreciation differences that deserve attention.
A tax professional can then determine whether the potential catch-up deduction justifies the study and how to report the resulting section 481(a) adjustment. The strongest case is one where the property has substantial qualifying components, the documentation supports their classification, and the resulting tax deferral is meaningful after considering passive activity rules and future recapture.
