IRS Notice 2026-11: Guidance changes to the One Big Beautiful Bill Act and Affect on 100% Bonus Depreciation

Unpacking H.R. 1, IRS Notice 2026-11 and The “One Big Beautiful Bill Act”

If you follow real estate tax strategy at all, you’ve probably seen recent discussion about IRS Notice 2026-11 and its impact on bonus depreciation.

When guidance like this comes out, I take the time to read it carefully and separate what actually affects planning decisions from everything else. The goal isn’t to react to headlines. It’s to understand what changed, what didn’t, and how investors should adjust—if at all.

This post summarizes the key takeaways from IRS Notice 2026-11 and explains what they mean in practice for real estate investors, particularly those using or considering cost segregation.

What IRS Notice 2026-11 Actually Addresses

At a high level, this notice provides interim guidance on bonus depreciation under Section 168(k), as amended by recent legislation.

Most notably, it reflects changes made by the One Big Beautiful Bill Act, which restored 100% bonus depreciation on a permanent basis for qualified property acquired and placed in service after January 19, 2025.

The notice also clarifies:

• How effective dates apply under the updated law
• How acquisition-date rules work, including the treatment of binding written contracts
• How certain elections under Section 168(k) operate going forward

This guidance is meant to ensure the rules are applied consistently while the IRS works toward issuing formal regulations.

Five Practical Takeaways for Real Estate Investors

After reviewing the notice, there are five points investors should understand moving forward. None of them are complicated, but each one affects how depreciation planning actually works in practice.

1. Placed-in-service timing still controls when depreciation begins
2. Bonus depreciation remains available, but timing and documentation matter
3. Acquisition-date rules deserve closer attention
4. Cost segregation outcomes depend heavily on how studies are performed
5. Timing reviews should happen before returns are filed, not after

The sections below expand on each of these points.

Placed-in-Service Timing Still Matters

Although Notice 2026-11 doesn’t redefine “placed in service,” it reinforces a concept that continues to drive depreciation outcomes.

Depreciation begins when a property is ready and available for its intended use. In real estate, that timing often differs from the purchase or closing date—especially for value-add properties or assets undergoing renovation.

For example, if a property closes late in the year but renovations aren’t complete until the following year, depreciation typically begins when the property is actually placed in service. That timing can directly affect how much depreciation is available in the first year and whether bonus depreciation applies.

This remains one of the most common areas where assumptions create problems.

Bonus Depreciation Remains Available

The notice does not eliminate bonus depreciation. In fact, it reflects legislation that restores 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025.

For real estate investors, this continues to apply primarily to the short-life assets identified through cost segregation—generally 5-, 7-, and 15-year property.

What the notice reinforces is that eligibility depends on proper timing and support. The rules themselves haven’t changed dramatically, but consistent application and documentation matter.

Acquisition-Date Rules Deserve Attention

One area the notice does focus on directly is how acquisition dates are determined for purposes of bonus depreciation.

This includes clarification around binding written contracts and how acquisition dates are evaluated when contracts are executed before statutory changes but property is placed in service later.

For investors acquiring property around legislative transition periods, these rules can affect whether 100% bonus depreciation applies. This is an area where careful review—rather than assumptions—can materially change the outcome.

A Note on the “10% Rule” for Construction Projects

One point in the notice that may matter for certain investors shows up on page 8 and relates to construction projects that span a change in the law.

For self-constructed property, the IRS relies on existing acquisition-date rules to determine which bonus depreciation regime applies. Under those rules, a project is generally treated as “acquired” when physical construction begins. However, there’s an important exception.

If more than 10% of the total cost of the project is incurred after the relevant effective date, the property may instead be treated as acquired after that date.

Notice 2026-11 doesn’t create a new 10% rule or change how it works. It simply points taxpayers back to this long-standing framework so they know how to apply it under the restored 100% bonus depreciation rules.

In practice, this becomes relevant for ground-up construction or major self-constructed improvements that began before January 19, 2025 and were completed afterward. In those cases, the timing and amount of costs incurred before and after that date can affect whether 100% bonus depreciation is available on qualifying components.

This is a fact-specific analysis, and it’s an area where assumptions can easily lead investors in the wrong direction without a closer review.

How the OBBBA Guidance Update Changes Cost Segregation Studies

Separate from the notice itself, it’s worth reinforcing what this guidance means in practice for cost segregation.

Cost segregation remains a valid and widely used tax strategy. However, outcomes depend heavily on how studies are performed. Engineering-based analysis, accurate asset classification, and supportable assumptions matter—especially as the IRS continues to emphasize consistency in applying depreciation rules.

This notice doesn’t change cost segregation mechanics. It underscores the importance of doing the work correctly and aligning depreciation with how and when property is actually placed in service.

Timing Reviews Should Happen Before Filing

One of the most practical lessons reinforced by this notice is the value of timing reviews.

Before filing a return, investors should understand:

• When renovations were completed
• When units were available for rent
• When the property met the definition of placed in service

Waiting to address these questions after filing limits flexibility, even though certain corrective options may still exist.

Good depreciation planning happens upfront, not retroactively.

Final Thoughts

IRS Notice 2026-11 doesn’t take anything away from real estate investors. It clarifies how bonus depreciation rules apply under the current law and reinforces the importance of timing and consistency.

For investors pursuing cost segregation, the strategy remains intact. When depreciation is aligned with placed-in-service timing and supported by sound analysis, it continues to be one of the most effective tax planning tools available.

As always, the right move isn’t guessing. It’s slowing down, reviewing the details, and understanding how timing affects your specific property before decisions are locked in.

You can refer to the full IRS Notice 2026-11 here. 

Check out our Cost Segregation Calculator. 

Additional Resource: Detailed Explanation of the OBBBA and How It Brings Back 100% Bonus