IRS Clarifies Bonus Depreciation Rules as Cost Segregation Audits Rise

Notice 2026-11 follows permanent 100% bonus depreciation enacted in July 2025, while smaller investors face rising scrutiny over documentation standards.

By the Family Office Real Estate Daily Desk·Thursday, October 15, 2026·2 min read

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IRS Clarifies Bonus Depreciation Rules as Cost Segregation Audits Rise — Image: editorial illustration · Story sourced from biggerpockets.com

The Internal Revenue Service issued Notice 2026-11 in January 2026, clarifying the elections available to taxpayers under permanent bonus depreciation rules enacted seven months earlier. The notice follows the One Big Beautiful Bill Act, signed July 4, 2025, which made 100% bonus depreciation permanent for qualified property acquired and placed in service after January 19, 2025.

Under prior law, bonus depreciation was phasing down and would have reached zero by 2027. That deadline is gone. Property bought after January 19, 2025, now qualifies for 100% bonus depreciation whenever it is placed in service, not just in the year of acquisition.

Cost segregation breaks a property into its components and reclassifies parts such as flooring, cabinetry and certain site improvements into five-year, seven-year or 15-year properties instead of the standard 27.5-year residential depreciation schedule. That reclassification is what makes bonus depreciation possible on a larger portion of the property upfront.

The IRS has disallowed studies that used generic, templated reports instead of property-specific engineering analysis. A defensible cost segregation claim requires contemporaneous, property-specific records. Doing a cost segregation study does not trigger an audit by itself, but it raises the bar for documentation needed if an audit occurs.

IRS Criminal Investigation press releases from 2026 show solo investors and small portfolio owners facing consequences, not just large investment funds. High income offset by large losses is one of the biggest audit triggers, since strategies like Real Estate Professional Status, short-term rental status and cost segregation can create significant paper losses against W-2 or other active income.

Tax efficiency alone rarely justifies an allocation thesis, but tax inefficiency paired with weak documentation has ended plenty of otherwise sound ones, family office advisor Jaf Glazer has cautioned.

Real Estate Professional Status is one of the most heavily scrutinized claims on a real estate investor's return. It requires contemporaneous documentation of hours and material participation, not a checkbox at tax time. Rental losses are a normal part of owning rental property, especially with depreciation, but what draws attention is a loss with no documentation behind it.

An audit is a request for documentation, not an accusation. The IRS is asking investors to substantiate what is already on the return. If records are organized, an audit is a paperwork exercise. Investors remain legally responsible for what is on the return even if a professional prepared it.

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Family Office Real Estate Daily Desk · our analysis, not the source's

Family offices running separate-account or direct-ownership structures should audit their cost segregation providers before engaging one. The source references a specific firm built around property-specific engineering documentation rather than templated shortcuts, and that distinction determines whether a large depreciation deduction survives examination or gets reclassified as ordinary income. The permanent bonus depreciation rule removes the urgency that drove corners-cutting in 2023 and 2024, so there is no reason to accept a generic study now.

For co-GP or platform-capital routes, the documentation burden falls on the sponsor, but family offices should still require sight of the cost segregation methodology during diligence. A sponsor using a templated approach exposes the LP to reclassification risk even if the LP did not select the provider. The IRS has disallowed studies that lacked property-specific engineering analysis, and that risk flows through the K-1.

Underwrite the compliance cost as a line item, not an afterthought. Contemporaneous time logs for Real Estate Professional Status, property-specific cost segregation reports, and organized expense documentation are not optional if the strategy relies on offsetting W-2 or other active income with rental losses. The arithmetic here is straightforward: high income offset by large paper losses is a known statistical trigger, and the documentation standard has risen while the phase-down deadline pressure has disappeared. Price in the cost of a qualified provider and a bookkeeping system that timestamps every entry, or avoid the structure entirely.

Avoid any route that treats Real Estate Professional Status as a box to check at tax time. The IRS scrutinizes this claim heavily, and contemporaneous documentation of hours and material participation is mandatory. If the hours are not logged in real time and the participation is not demonstrable, the status will not survive an audit and the passive loss limitations reappear retroactively. That reclassification can trigger amended returns, interest and penalties across multiple years. If the family office principal or advisor cannot meet the real-time logging requirement, do not claim the status.

Original reporting

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