Cost Segregation and Passive Activity Losses: A Guide for UHNWI Real Estate Portfolios

Key Takeaways

Cost segregation accelerates depreciation on commercial real estate under I.R.C. § 168, and with 100% bonus depreciation permanently restored by the OBBBA, can generate first-year deductions equal to 20–40% of a property’s depreciable basis.
The trap: Under I.R.C. § 469, rental real estate is treated as a passive activity per se, meaning the cost segregation loss generally cannot offset a UHNWI’s W-2 wages, business income, or portfolio income.
The escape routes: A taxpayer can unlock those losses by qualifying as a Real Estate Professional under I.R.C. § 469(c)(7) (750+ hours and >50% of personal services in real estate) or by structuring a property as a short-term rental that falls outside the definition of “rental activity” under Treas. Reg. § 1.469-1T(e)(3)(ii).
A binding purchase price allocation cannot be overridden by a later cost segregation study—per Peco Foods, Inc. v. Commissioner, T.C. Memo. 2012-18, aff’d 522 F. App’x 840 (11th Cir. 2013).
Even after losses become non-passive, the excess business loss limitation under I.R.C. § 461(l) (permanently made by the OBBBA) caps how much can offset non-business income in a single year ($512,000 joint / $256,000 single for 2026).

Introduction

For ultra-high-net-worth individuals (UHNWIs) building commercial real estate portfolios, cost segregation is one of the most powerful depreciation tools in the tax code. By reclassifying components of a building—specialty electrical systems, decorative lighting, land improvements—into shorter-lived asset categories, a taxpayer can generate a first-year depreciation deduction that is a multiple of what straight-line depreciation would allow. With the One Big Beautiful Bill Act’s permanent restoration of 100% bonus depreciation under I.R.C. § 168(k), these deductions can be enormous.

But there is a rule that quietly determines whether that deduction produces any actual tax benefit—and it is the rule most cost segregation marketing materials leave out.

I.R.C. § 469 stands directly in the way. It sorts every taxpayer’s income and loss into separate categories and restricts how losses in one category can be used against income in another. Rental real estate is treated as a passive activity per se under § 469(c)(2)—meaning the law automatically classifies rental losses as passive, no matter how actively involved the owner is in managing the property. Passive losses can only offset passive income. They cannot wipe out a UHNWI’s salary, business income, or portfolio income.

This means a cost segregation study that generates a $500,000 paper loss on a commercial building does not automatically reduce the investor’s tax bill. The deduction does not disappear—it is held back, suspended and carried forward until the investor generates passive income or sells the property.

This article examines the statutory framework, the two primary escape routes, key authorities, and practical planning considerations for UHNWIs seeking to unlock the full value of cost segregation.

What Is the Passive Activity Loss Rule?

Direct answer: Under I.R.C. § 469, losses from passive activities—including rental real estate—can only offset income from other passive activities. They cannot offset active income (wages, salary, business income) or portfolio income (interest, dividends, capital gains).

Statutory Basis

I.R.C. § 469 was enacted by the Tax Reform Act of 1986 specifically to shut down real estate tax shelters. The statute divides income and loss into three buckets:

Income Category	Definition	Examples
Active	Income from a trade or business in which the taxpayer materially participates	W-2 wages, business income from an operating company
Portfolio	Investment income	Interest, dividends, capital gains, royalties
Passive	Income from a trade or business in which the taxpayer does not materially participate, and rental activities	Rental income, limited partnership interests

The core rule under § 469(a) and § 469(d) is strict: passive losses can only offset passive income. A passive loss that cannot be used in the current year is suspended and carried forward.

Rental real estate is treated as passive per se under § 469(c)(2). This means that even if the owner spends hundreds of hours managing the property, the rental activity remains passive by default. The only exceptions are the Real Estate Professional rule and the short-term rental exception.

The Cost Segregation Interaction

When a cost segregation study is performed on a rental property, the resulting depreciation deduction flows onto Schedule E as a rental loss. If the property is a passive activity, that loss is passive—and it is trapped. As one practitioner resource explains, “a high earner generally CANNOT simply buy a rental property, run a cost segregation study, and deduct the resulting rental property loss against their salary, their medical practice income, or their law firm income”.

The deduction is real. The depreciation is real. But without an exception, the benefit is deferred, not immediate.

Binding Effect and Legal Weight

Direct answer: I.R.C. § 469 is primary authority—a statutory provision of the Internal Revenue Code, binding on the IRS, the courts, and taxpayers alike.

Hierarchical Position

Authority	Type	Binding Effect
I.R.C. § 469	Primary (statute)	Binds IRS, courts, and taxpayers
I.R.C. § 469(c)(7)	Primary (statute)	REPS exception
Treas. Reg. § 1.469-9	Primary (regulation)	Binds IRS, courts, and taxpayers
Treas. Reg. § 1.469-1T(e)(3)(ii)	Primary (regulation)	Short-term rental exception
Glick v. United States (1996)	Primary (judicial)	REP tested at joint return level
Peco Foods, Inc. v. Comm’r, T.C. Memo. 2012-18	Primary (judicial)	Binding purchase price allocation
IRS Passive Activity Loss Audit Technique Guide	Secondary (IRS guidance)	Not binding; used by examiners

The statute is mandatory. A taxpayer cannot argue that § 469 is advisory. The IRS will apply it, the Tax Court will enforce it, and the Courts of Appeals will uphold it. The Passive Activity Loss Audit Technique Guide expressly states that it “is not an official pronouncement of the law or the position of the Service and cannot be used, cited, or relied upon as such” .

Who Is Bound?

IRS: Bound by the statute, regulations, and court decisions within the relevant circuit.
Courts: Bound by the statute and applicable appellate precedent. Tax Court decisions are binding precedent in the Tax Court.
Taxpayers: Bound by the statute. A taxpayer who claims a passive loss against active income without qualifying for an exception faces disallowance, back taxes, interest, and potentially a 20% accuracy-related penalty under I.R.C. § 6662 .

Key Authorities and Cases

Primary Statutory Authority

I.R.C. § 469 — The passive activity loss statute. Establishes the general rule that passive losses can only offset passive income.
I.R.C. § 469(c)(2) — Treats rental real estate as a passive activity per se.
I.R.C. § 469(c)(7) — The Real Estate Professional exception. Provides relief from the per se passive treatment for qualifying taxpayers.
I.R.C. § 469(c)(7)(B) — The two-part REPS test: more than 750 hours of real property trades or businesses, and more than 50% of personal services in real property trades or businesses.
I.R.C. § 168(k) — Bonus depreciation. Permanently restored to 100% by the OBBBA for qualified property acquired and placed in service after January 19, 2025.
I.R.C. § 461(l) — Excess business loss limitation. Permanently made by the OBBBA. Caps aggregate business losses at $512,000 (joint) / $256,000 (single) for 2026.

Treasury Regulations

Treas. Reg. § 1.469-9 — Rules for certain rental real estate activities. Defines a “qualifying taxpayer” and establishes that a rental activity is passive unless the taxpayer materially participates.
Treas. Reg. § 1.469-9(c)(4) — Provides that the REPS tests are applied at the joint return level for married couples filing jointly.
Treas. Reg. § 1.469-1T(e)(3)(ii) — Defines exceptions to the term “rental activity,” including the 7-day average rental period rule and the 30-day rule with significant personal services.
Treas. Reg. § 1.469-9(g) — The aggregation election, which allows a qualifying taxpayer to treat all rental real estate as a single activity for material participation purposes.

Key Cases

Glick v. United States, 96-2 U.S. Tax Cas. (CCH) ¶ 50,576 (D. Ariz. 1996) — The husband owned most of the real estate, but the wife actively managed the properties. The IRS argued the losses should remain passive because ownership rested with the husband. The court disagreed, holding that REP qualification is tested at the joint return level. Because the wife met the REP requirements, the couple’s rental activities were treated as non-passive.
Parker v. Commissioner, T.C. Memo. 2012-139 — The Tax Court reinforced the principle that REP status is determined on a household basis for joint filers, even when ownership and hours don’t align neatly between spouses.
Peco Foods, Inc. v. Commissioner, T.C. Memo. 2012-18, aff’d 522 F. App’x 840 (11th Cir. 2013) — The Tax Court held that a taxpayer was bound by the clear and unambiguous terms of a written purchase price allocation agreement and could not subsequently deviate from it through a cost segregation study. The IRS Audit Technique Guide cites this case as authority that a written purchase price allocation between buyer and seller is binding on the taxpayer and cannot be changed by a subsequent study.

Note: Practitioners should verify current citations before relying on any specific case.

IRS Guidance

IRS Passive Activity Loss Audit Technique Guide — The IRS’s primary audit resource for passive activity issues. It instructs examiners to “scrutinize” non-passive loss claims and to review prior and subsequent year returns for inconsistencies.
IRS Notice 2026-11 — Interim guidance on the permanent 100% bonus depreciation under § 168(k), confirming continuity with existing regulatory framework and establishing a component election for self-constructed property.
Cost Segregation Audit Technique Guide, IRS Publication 5653 (Rev. 2-2025) — Outlines the 13 principal elements of a quality cost segregation study.

Practical Application in Tax Practice

Direct answer: Tax practitioners use two primary strategies to unlock cost segregation losses for UHNWIs: qualifying as a Real Estate Professional or structuring the property as a short-term rental that falls outside the definition of “rental activity.”

Path 1: Real Estate Professional Status (REPS)

Under I.R.C. § 469(c)(7), a taxpayer qualifies as a real estate professional if:

More than 750 hours per year are spent in real property trades or businesses in which the taxpayer materially participates, and
More than 50% of the taxpayer’s personal service time is devoted to those real property trades or businesses.

The spouse opportunity: Under Treas. Reg. § 1.469-9(c)(4), the REPS tests are applied at the joint return level. If either spouse meets the REPS tests, the couple as a whole is treated as real estate professionals—and all rental activities reported on the joint return can be treated as non-passive. Even if the REP spouse owns only 1% of the entity, the REP exception applies to the entire return.

The aggregation election: Under Treas. Reg. § 1.469-9(g), a qualifying taxpayer can elect to treat all rental real estate as a single activity for material participation purposes. This is particularly valuable for UHNWIs with portfolios of 3–10 properties, as it allows them to meet material participation on a portfolio-wide basis rather than property-by-property.

The critical caution: REPS is one of the IRS’s most audited areas, and most landlords lose REPS cases in Tax Court because they cannot prove their hours—not because they did too little work. The IRS’s Passive Activity Loss Audit Technique Guide instructs examiners to scrutinize logs hard, and courts reject after-the-fact estimates. Contemporaneous, detailed time logs are essential.

Path 2: The Short-Term Rental Exception

Under Treas. Reg. § 1.469-1T(e)(3)(ii), a property is not a “rental activity” for passive activity purposes if the average rental period is 7 days or less. This means the activity falls outside the per se passive rule—and if the owner materially participates (typically 100+ hours and more than anyone else, or the 500-hour test), the losses become non-passive .

For a UHNWI with a cost segregation study on a short-term rental, this creates a powerful planning opportunity. A $700,000 rental property with a cost segregation study can generate up to **$200,000 in first-year deductions**—and if the property qualifies as a short-term rental with material participation, those deductions can offset W-2 income .

The caution: If the average stay exceeds 7 days, the losses snap back to passive, and depreciation recapture on sale is taxed at up to 25% , meaning taxes are deferred rather than eliminated.

The Excess Business Loss Limitation

Even after losses become non-passive through REPS or the STR exception, the excess business loss limitation under I.R.C. § 461(l) may suspend deductions that exceed the annual threshold. The OBBBA made the EBL limitation permanent starting in 2025. For 2026, the cap is $512,000** for married filing jointly and **$256,000 for single filers. A loss that is fully non-passive under REPS can still be partially deferred by § 461(l) if aggregate business losses exceed the threshold.

Interaction with Other Authorities

Direct answer: When cost segregation interacts with the passive activity loss rules, the statute controls. When a purchase price allocation agreement exists, that agreement binds the taxpayer. When the EBL limitation applies, it caps the benefit even after losses become non-passive.

Conflict Scenarios

Cost Segregation vs. Passive Activity Loss Rules: The cost segregation study generates the deduction, but § 469 determines whether it can be used. Without REPS or the STR exception, the deduction is suspended, not lost. The taxpayer must either generate passive income, sell the property in a fully taxable transaction, or qualify for an exception.
Cost Segregation vs. Purchase Price Allocation: If the buyer and seller executed a written allocation, that allocation is binding on the taxpayer and cannot be modified by a subsequent cost segregation study. This principle was established in Peco Foods. The practical planning point: conduct the cost segregation analysis before closing and incorporate the results into the purchase agreement.
REPS vs. EBL Limitation: Even after REPS converts the loss to non-passive, § 461(l) caps how much can offset non-business income in a single year. A $1 million cost segregation deduction that is fully non-passive under REPS may still be partially suspended by the $512,000 EBL cap.
Short-Term Rental vs. Passive Activity Rules: The STR exception is narrow. If the average rental period exceeds 7 days, the property is a rental activity and the per se passive rule applies. Documentation of average rental periods is critical.
Statute vs. IRS Guidance: A Private Letter Ruling or Chief Counsel Advice that conflicts with § 469 is invalid to the extent of the conflict. The Passive Activity Loss Audit Technique Guide, as a secondary authority, cannot override the statute or regulations.

Frequently Asked Questions

What is the passive activity loss rule?

Under I.R.C. § 469, losses from passive activities—including rental real estate—can only offset income from other passive activities. They cannot offset active income (wages, business income) or portfolio income (interest, dividends, capital gains). Rental real estate is treated as passive per se under § 469(c)(2), regardless of how actively the owner manages the property.

How does cost segregation interact with the passive activity loss rules?

A cost segregation study on a rental property generates a depreciation deduction that flows onto Schedule E as a rental loss. If the property is a passive activity, that loss is passive—and it is suspended until the taxpayer generates passive income, sells the property, or qualifies for an exception (REPS or the short-term rental exception).

What is Real Estate Professional Status?

Under I.R.C. § 469(c)(7), a taxpayer qualifies as a real estate professional by spending more than 750 hours per year in real property trades or businesses in which they materially participate, and devoting more than 50% of their personal service time to those activities. If either spouse meets the tests on a joint return, the couple is treated as real estate professionals, and rental losses become non-passive.

Can I use the short-term rental exception to unlock cost segregation losses?

Yes, if the property qualifies under Treas. Reg. § 1.469-1T(e)(3)(ii)—meaning the average rental period is 7 days or less—and the owner materially participates in the activity. The property is then not a “rental activity” for passive activity purposes, and the cost segregation losses can offset active income.

What is the excess business loss limitation?

Under I.R.C. § 461(l), made permanent by the OBBBA, aggregate business losses are capped at $512,000** for married filing jointly and **$256,000 for single filers for 2026. Losses exceeding the threshold are carried forward as a net operating loss. This limitation can suspend deductions even after they become non-passive through REPS or the STR exception.

Conclusion

Cost segregation is a powerful, statutorily grounded strategy for accelerating depreciation on commercial real estate. Its authority rests on I.R.C. § 168, validated by the Tax Court in Hospital Corporation of America, and supercharged by the permanent restoration of 100% bonus depreciation under the OBBBA. But for UHNWIs, the passive activity loss rules under I.R.C. § 469 are the gatekeeper that determines whether the deduction produces an immediate tax benefit or is merely deferred.

The two primary escape routes are:

Real Estate Professional Status under § 469(c)(7)—requires rigorous, contemporaneous time logs and careful attention to the 750-hour and 50% tests.
The short-term rental exception under Treas. Reg. § 1.469-1T(e)(3)(ii)—requires an average rental period of 7 days or less and material participation.

The key limitations are:

Passive losses are suspended, not lost—they carry forward until passive income or disposition.
Binding purchase price allocations cannot be overridden by a subsequent cost segregation study.
The excess business loss limitation under § 461(l) caps how much non-passive loss can offset non-business income in a single year.
Documentation is everything—REPS is one of the most audited areas of the tax code, and courts routinely reject after-the-fact estimates.

For UHNWIs, cost segregation and passive activity losses are not separate planning questions—they are two halves of a single strategy. The deduction is only as valuable as the taxpayer’s ability to use it.

DISCLAIMER: THIS ARTICLE IS FOR INFORMATIONAL PURPOSES ONLY AND DOES NOT CONSTITUTE LEGAL ADVICE. THE INFORMATION MAY BE OUTDATED AND YOU ARE NOT TO RELY ON IT. CONTACT YOUR PROFESSIONAL TO GUIDE YOU BASED ON YOUR CURRENT SITUATION, OR WHAT MAY APPLY TO PREVIOUS YEARS. THIS ARTICLE IS ONLY MEANT TO PROVIDE GENERAL INFORMATION AND NOT A SPECIFIC ANSWER. YOU ARE NOT OUR CLIENT AND WE HAVE NOT ADVISED YOU.

Author Bio

Alan Goldstein is an Enrolled Agent and researcher with 26 years of experience in federal and state tax controversy. He advises high-net-worth families and closely held businesses on income-shifting strategies, charitable planning, and IRS audit defense.

Last Updated: 2026

Internal Linking Suggestions

[Internal Link: Real Estate Professional Status]
[Internal Link: Bonus Depreciation]
[Internal Link: Cost Segregation Audit Technique Guide]

External Linking Suggestions

I.R.C. § 469 — Cornell LII
I.R.C. § 168 — Cornell LII
IRS Cost Segregation Audit Technique Guide — IRS.gov
IRS Notice 2026-11 — IRS.gov

Image Alt Text

“Flowchart showing the interaction between cost segregation depreciation and the I.R.C. § 469 passive activity loss rules, with escape routes through REPS and the short-term rental exception”
“Table comparing passive loss treatment under default rules, REPS qualification, and the short-term rental exception”

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