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IRS Notice 2026-11, released in January 2026, explains how the post-OBBBA 100 percent bonus depreciation rules apply. It lets taxpayers rely on the familiar prior bonus depreciation regulations with the key dates updated to the January 2025 OBBBA cutoff, and taxpayers can rely on it now. The most important takeaway: to qualify for the full 100 percent deduction, both your acquisition date and your placed-in-service date must fall on or after January 19, 2025, and under the written binding contract rule, your acquisition date can be the date you signed, not the date you closed.
In a title office in Pueblo, Colorado, a developer named Hector almost made a $90,000 mistake without knowing it. He had signed a binding contract to buy a commercial building in early January 2025. The deal closed in March 2025. When his accountant started the cost segregation planning, she paused on one question that turned out to be worth far more than it looked.
"When exactly did you sign the binding contract? Not when you closed. When you signed."
Hector did not understand why it mattered. He closed in March, well after the January 19, 2025 cutoff for the new 100 percent bonus depreciation. He assumed he qualified for the full deduction. The closing date was after the cutoff, so what was the problem?
The problem was that the acquisition date, under the IRS rules, can be the binding contract date, not the closing date. And IRS Notice 2026-11, released in January 2026, confirmed exactly how those rules apply. This article walks through what the notice says and why, for someone like Hector, the date you signed can matter more than the date you closed.
Start with the rule the notice interprets. The One Big Beautiful Bill Act, signed into law on July 4, 2025, permanently restored 100 percent bonus depreciation for qualified property acquired and placed in service after January 19, 2025. Property that falls before that cutoff is stuck under the old phase-down schedule, where 2025 bonus had dropped all the way to 40 percent.
That gap is enormous. The same reclassified components that get a 100 percent first-year deduction on the right side of the cutoff get only 40 percent on the wrong side. On a property with $750,000 of reclassified components, that is the difference between a $750,000 first-year deduction and a $300,000 one. Which side of January 19, 2025 your property lands on is one of the most valuable dates in your entire tax picture.
So the natural question every property owner asked was: how do I know which side I am on? When exactly did I acquire the property? Notice 2026-11 answered it.
The IRS released Notice 2026-11 in January 2026 as interim guidance on how the post-OBBBA bonus depreciation rules apply. The headline is reassuring for anyone who already understood the prior framework: the IRS chose continuity over reinvention.
Rather than write an entirely new set of rules, the notice allows taxpayers to rely on the existing, well-established bonus depreciation regulations from the prior era, with the key dates updated to reflect OBBBA. Where the old regulations referenced the September 2017 dates from the Tax Cuts and Jobs Act, the notice substitutes the new January 2025 dates. The familiar machinery stays. Only the dates move.
For property owners and their advisors, this is good news. It means the rules you or your CPA already understood for acquisition timing, binding contracts, self-constructed property, and the component election largely carry forward, now anchored to the January 19, 2025 cutoff. The notice gives taxpayers something they can rely on immediately while formal regulations are written.
Three pieces of that guidance matter most for cost segregation clients: the acquisition date rule, the written binding contract rule, and the component election.
Here is the requirement that caught Hector. To qualify for the full 100 percent bonus depreciation, both the acquisition date and the placed-in-service date must fall on or after January 19, 2025.
Most owners focus only on the placed-in-service date, when the property was ready and available for use, because that is the date that feels like the real start. But the notice confirms that the acquisition date matters too, and the acquisition date is not always your closing date.
This is where the second rule comes in.
The notice confirms that the long-standing written binding contract rule continues to apply. In plain terms, the rule says that property is not treated as acquired after the date you entered into a written binding contract to acquire it.
Read that carefully. If you signed a binding contract to buy the property on a certain date, your acquisition date for these purposes can be that signing date, even if you did not close until months later. The binding contract date, not the closing date, can be the date that counts.
Now Hector's situation snaps into focus. He signed a binding contract in early January 2025. That was before the January 19, 2025 cutoff. He closed in March, after the cutoff. He assumed the March closing put him safely on the 100 percent side. But because the binding contract was signed before January 19, his acquisition date under the binding contract rule could fall before the cutoff, which would knock his property out of the full 100 percent bonus and back into the 40 percent phase-down rate.
That is the $90,000 swing. Not because of when he closed. Because of when he signed.
Whether Hector actually loses the full deduction depends on details that are squarely in expert territory, and this is the part where you do not guess.
The rule turns on whether the contract was genuinely binding and on the specific terms. The guidance framework includes concepts like whether the contract was binding under state law, whether damages were limited, and certain safe harbors. There are situations involving non-binding contracts and specific thresholds where the analysis differs. The point for a property owner is not to self-diagnose. The point is to recognize that the signing date is a live issue and to get it analyzed correctly.
For Hector, the right move was exactly what his accountant did: stop, identify that the binding contract date was before the cutoff, and analyze it properly rather than assuming the closing date controlled. Depending on the specifics, there may be planning around it, or the honest answer may be that the property falls under the phase-down rate. Either way, knowing before filing is worth far more than discovering it after.
The notice also confirmed the continued availability of the component election, and this one is genuinely useful for real estate.
In simplified terms, the component election can allow certain components of a larger property to be treated separately for bonus depreciation timing, particularly where a larger project straddles the cutoff dates. For a building under construction across the January 19, 2025 line, the ability to treat qualifying components separately can preserve bonus depreciation on parts of the project that would otherwise be caught on the wrong side of the date.
This is exactly the kind of provision that rewards an engineered approach. A cost segregation study that identifies and properly documents the components is the foundation for applying a component election correctly. The election is only as good as the component analysis underneath it. This is your CPA's call to make and document, supported by the engineering work.
Step back from the details and the overall message of Notice 2026-11 is favorable for property owners pursuing cost segregation.
The framework is familiar. The IRS chose to extend rules that practitioners already understood rather than impose new ones, which reduces uncertainty. Taxpayers can rely on the guidance now. The component election survived. And the permanent nature of the 100 percent rate, for property that clears the cutoff, means long-term planning is more predictable than it has been in years.
The main thing the notice asks of property owners is precision about dates. The acquisition date and the placed-in-service date both matter, the binding contract date can be the acquisition date, and both need to clear January 19, 2025 for the full benefit. That precision is exactly what an engineered study and a careful CPA provide, and exactly what a rushed software estimate tends to skip.
One thing the notice did not do: it did not address the new qualified production property provision. That is a separate piece of the puzzle awaiting its own guidance, and a separate topic.
The date rules trip up owners in predictable ways. Watch for these.
Assuming the closing date is the acquisition date. Hector's near miss. The binding contract date can control, and it can fall on the wrong side of the cutoff even when you close after it.
Tracking only the placed-in-service date. Both the acquisition date and the placed-in-service date must clear January 19, 2025 for the full 100 percent. Watching only one is half the picture.
Self-diagnosing the binding contract question. Whether a contract is genuinely binding, and how the safe harbors apply, is technical. Get it analyzed rather than guessing.
Ignoring the component election on a straddling project. A project under construction across the cutoff may preserve bonus on qualifying components through the election, but only with the engineering analysis to support it.
Hector's near miss is the whole lesson in one story. He was about to claim 100 percent bonus depreciation based on his March closing date, never realizing the January binding contract date could control. Had he filed that way and been examined, the difference between the 100 percent he claimed and the 40 percent he may have been entitled to is the $90,000 swing, plus the headache of a correction.
The fix cost him nothing but a conversation. His accountant asked the right question, the binding contract date got analyzed properly, and Hector filed a position he could actually defend instead of one that looked right and was not.
Keith Cunningham's discipline applies cleanly. The expensive errors are the ones that look fine on the surface. Hector's closing date looked fine. The dollars were hiding in a date he was not even looking at. Checking it cost a conversation. Not checking it could have cost $90,000 and an examination.
If you acquired property anywhere near the January 19, 2025 cutoff, do not assume your closing date settles the question. Find your binding contract date. Both dates matter, and the signing date can be the one that counts.
The Cost Seg America team works with property owners and their CPAs to get these dates right and to build the engineered study that supports the component election and the bonus depreciation position. The free proposal is the place to start, and the date analysis is part of getting your study built on a defensible footing.
Notice 2026-11 made the post-OBBBA world more predictable. It also made one thing clear: your acquisition date is not a formality. For property near the cutoff, it can be the most valuable date on your file.
What is IRS Notice 2026-11?
It is interim guidance the IRS released in January 2026 explaining how the post-OBBBA 100 percent bonus depreciation rules apply. It lets taxpayers rely on the existing bonus depreciation regulations with the key dates updated to the January 2025 OBBBA cutoff, and taxpayers can rely on it immediately.
Why does my acquisition date matter for bonus depreciation?
To qualify for 100 percent bonus depreciation, both your acquisition date and your placed-in-service date must fall on or after January 19, 2025. If your acquisition date falls before the cutoff, the property may be limited to the lower phase-down rate even if you closed after the cutoff.
Can my binding contract date be my acquisition date?
Yes. Under the written binding contract rule confirmed by the notice, property is not treated as acquired after the date you entered into a written binding contract. So the signing date, not the closing date, can be the acquisition date that determines your bonus depreciation rate.
What is the component election?
It is a provision, preserved by the notice, that can allow certain components of a larger property to be treated separately for bonus depreciation timing, which can help on projects that straddle the cutoff. A cost segregation study provides the component analysis that supports it.
Did Notice 2026-11 address qualified production property?
No. The notice addressed bonus depreciation but did not cover the new qualified production property provision, which is awaiting its own separate guidance.
How do I make sure my dates are right?
Work with your CPA on the date analysis, and request a free proposal to build the engineered study that supports your position. Or reach out to the Cost Seg America team directly:
1-888-365-5023
info@costsegamerica.com
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