🇺🇸 Made in America·100% U.S.-Based Team · 24+ Years in Cost Segregation
A woman named Rachel was sitting at her kitchen table in Cincinnati last spring, looking at a settlement statement from her late father's estate. She had inherited a small commercial property: a three-tenant strip building near a suburban shopping district. Her father had bought it in 1992 for $480,000 and had owned it for 33 years. The estate appraisal valued it at $1.9 million at the date of his death.
Rachel was reviewing the property's depreciation schedule. After 33 years of straight-line depreciation, the building had been almost fully written down. Her father had claimed approximately $440,000 in cumulative depreciation, leaving only about $40,000 of basis on the books. The annual depreciation deduction in the last years of his ownership had been roughly $12,000 a year. Nothing.
Her CPA had told her she would inherit the property at a new tax basis equal to the date-of-death fair market value: $1.9 million. He had explained that this was the step-up in basis rule. The 33 years of depreciation her father had claimed went away on her tax return. She started fresh with a new $1.9 million basis to depreciate over 39 years.
What her CPA had not told her: that fresh $1.9 million basis was a candidate for cost segregation. And the math was going to be significantly different from what she expected.
This article explains how the step-up in basis works on inherited commercial and rental property, what cost segregation produces on a stepped-up property, and why this combination is one of the most powerful tax strategies in real estate. The CPA conversation Rachel was about to have with her own accountant changed by about $440,000 of additional federal deductions in her first year of ownership.
When a property owner dies, the assets included in the estate generally receive a new income tax basis equal to the fair market value on the date of death (or six months later if the estate elects the alternate valuation date). This is the step-up in basis rule under Internal Revenue Code Section 1014.
The mechanic is simple in concept. The decedent's original cost basis, with all the depreciation and improvements layered on top, is replaced with a single new basis equal to the appraised value at death. The heir starts fresh.
This rule applies to most property held outright at death. It does not apply to property in irrevocable trusts that were funded during the decedent's lifetime (those assets are not in the decedent's estate). It does not apply to retirement accounts (which are not capital assets). It does apply to commercial real estate, rental real estate, residential property held as investment, and any other depreciable real property the decedent owned at death.
For the heir, the practical effect on depreciation is dramatic.
The old depreciation schedule disappears. The heir does not pick up where the decedent left off. The decedent's cumulative depreciation does not transfer to the heir. The heir starts with a clean slate.
The new basis is the appraised value at death. On Rachel's property, that was $1.9 million instead of the $40,000 remaining basis on her father's books. The difference: $1.86 million of new depreciable basis that did not exist the day before her father died.
The recovery period restarts. A 39-year commercial building or 27.5-year residential rental starts a brand new clock on the heir's tax return. The remaining useful life of the actual building does not matter for tax purposes. The depreciation schedule begins anew.
The cost segregation opportunity restarts. This is the part most heirs and their accountants miss. A cost segregation study can be performed on the stepped-up basis, identifying components qualifying for shorter MACRS class lives. MACRS is the IRS depreciation framework, short for Modified Accelerated Cost Recovery System. It assigns recovery periods of 5, 15, 27.5, or 39 years to different types of property. Putting components into 5-year or 15-year classes instead of 39-year produces much larger Year 1 deductions. The full Year 1 deduction is available on the new basis, exactly as if the heir had just purchased the property.
Rachel's property had a $1.9 million stepped-up basis. The estate appraisal had allocated approximately $380,000 to land, leaving $1.52 million of depreciable building basis.
Without cost segregation, her Year 1 depreciation under the 39-year schedule would have been approximately $39,000. Better than her father's $12,000 in the late years, but still a modest deduction.
A cost segregation study on the stepped-up basis identified $440,000 of components reclassifiable into 5-year and 15-year MACRS classes. That is a 29 percent reclassification rate on the depreciable basis, typical for a strip commercial property.
Under the 100 percent bonus depreciation that the One Big Beautiful Bill Act restored permanently for property placed in service after January 19, 2025, all $440,000 deducted in Year 1.
Rachel's total Year 1 depreciation was approximately $480,000: the $440,000 of accelerated components plus the remaining 39-year portion of the building shell.
At her marginal federal bracket of 32 percent, the immediate Year 1 federal tax savings was approximately $154,000.
For context: her father, in his last year of ownership before his death, had claimed approximately $12,000 of depreciation and saved roughly $4,400 in federal taxes on that deduction. The same property in Rachel's hands, in her first year of ownership, produced $480,000 of depreciation and $154,000 of tax savings. The change was not in the property. The change was in the basis.
Cost segregation on inherited property is one of the most powerful, least known applications of the strategy. There are three reasons most accountants do not raise it.
First: it is not visible on the surface. The heir's tax return shows the inherited property at its new basis. The depreciation schedule starts fresh. Nothing on the return signals to the accountant that an additional analysis could accelerate the deductions. The default behavior is to depreciate the building over 39 years and move on.
Second: most accountants are not trained in cost segregation regardless of the basis history. Cost segregation is an engineering analysis. CPAs are tax professionals, not engineers. The CPA's job is to apply the tax results of the engineering analysis. The CPA's job is not to identify the opportunity. That opportunity gets identified by the property owner, by a referring real estate professional, or by the cost segregation firm directly.
Third: estate administration is emotionally heavy. Heirs are processing loss. Accountants want to finish the tax return cleanly and let the family move forward. Suggesting an additional analysis that requires engineering work and may take four to six weeks feels like a complication. Most CPAs do not raise it.
The result is a substantial category of legitimate Year 1 deductions that go unclaimed every year by heirs of commercial and rental real estate.
For inherited property, the strongest timing for cost segregation is the first tax year of the heir's ownership. The full Year 1 deduction is available on the stepped-up basis. The 100 percent bonus depreciation under the OBBBA permits immediate deduction of all reclassified components.
If the property is inherited mid-year, the partial-year depreciation rules apply. The half-year convention puts approximately six months of standard depreciation into Year 1. The cost segregation reclassification on the stepped-up basis still produces the same total reclassification amount, but the Year 1 portion of the standard depreciation is partial-year.
For heirs who inherit late in the calendar year, some careful planning can shift the optimal placement of the cost segregation study. The study can be commissioned and the engineering analysis performed in the year of inheritance, with the report finalized and the election made on the return for that year. The bonus depreciation on the reclassified components is available even with the half-year convention on the standard portion.
If the heir does not commission the study in the first year of ownership, the lookback procedure through Form 3115 captures the missed acceleration in a later year. The referring CPA files the Form 3115 as standard work using designated change number 7. The catch-up deduction is captured as a positive Section 481(a) adjustment in the year of filing.
The math on a lookback is the same as on a current-year study, with the difference being which tax year the deduction lands in. Property owners who inherit in 2023 and have not yet commissioned a study can capture the catch-up on a 2025 return through Form 3115.
If you inherited commercial real estate, rental real estate, or other depreciable property within the last several years and have not commissioned a cost segregation study, you are sitting on one of the most powerful tax strategies available to property owners. The step-up in basis is the single largest depreciation reset most people will ever encounter. Combining it with cost segregation captures the full Year 1 benefit on the new basis.
If you are an executor or trustee currently administering an estate that includes real estate, the cost segregation analysis should be on the radar before the property is distributed. Even before the heir takes ownership, the cost segregation strategy can be planned and the engineering work coordinated.
If you are a property owner with significant appreciation in your real estate holdings, the step-up in basis at death is one of the most important estate planning considerations for those assets. The basis your heirs receive determines the depreciation runway available to them.
The Cost Seg America team has been performing engineered cost segregation studies on inherited property and other ownership transitions for more than 24 years. 16,000 studies. 125 IRS audits defended. Zero losses. $0 ever returned to the IRS. The average first-year savings across the 16,000+ completed studies is $438,511. Every study uses IRS Approaches 1 and 2. Every study is engineered, not estimated. Flat fee pricing disclosed before any work begins. 100 percent U.S.-based team. Unlimited audit defense included on every study. Written responses and phone representation. No time limit. No hour cap. No additional fee. Ever. Made in America, by Americans.
The next step on your inherited property takes 30 seconds. Send the property address, the date-of-death appraised value, and any documentation you have about the property. The Cost Seg America team sends back a free preliminary proposal within 24 hours showing the estimated Year 1 deduction, the methodology, the timeline, and the flat fee. No obligation either way.
Email: info@costsegamerica.com
Phone: 1-888-365-5023
Online: costsegamerica.com/free-proposal
Use the calculator, see your number, and request your free, no-cost proposal - delivered in 24 hours, with your flat fee quoted upfront and no obligation.