If an Opportunity Zone tract is not re-designated for 2027, December 31, 2026 is the deadline that matters: on that date a fund generally loses the ability to place new property acquisitions in the tract, with two exceptions that have to be built before year-end, and the land-versus-building allocation behind a cost segregation study is part of the fix.
There is a widely repeated claim that Opportunity Zone designations are about to disappear and existing investments are at risk. It is wrong, and believing it will send a sponsor after the wrong deadline. The 2018-designated tracts run through December 31, 2028, Notice 2026-40 announces relief for existing positions well past that date, and the ten-year election survives designation expiry under an existing regulation — so the cost segregation and depreciation planning inside a current project is not in jeopardy.
What is real is narrower and much closer: the December 31, 2026 cut-off for new acquisitions in a tract that is not re-designated, and one of its two exceptions turns on documentation your cost segregation and basis work already touches.
Two clocks, and only one of them is urgent
The confusion comes from treating one date as if it were the other. There are two separate clocks:
- The designation clock. Tracts designated in 2018 remain designated until December 31, 2028 (Puerto Rico: December 31, 2027). OBBBA's rewrite of §1400Z-1(f) — one of the OB3 provisions that actually changed how we plan — applies only to areas designated after enactment, so pre-enactment tracts stay on prior law. There is no de-designation. The 2027 round is a separate, new designation, not a replacement map that removes anyone.
- The acquisition clock. OBBBA §70421(c)(4)(A) replaced the fixed date in §1400Z-2(d)(2)(D)(i)(I) with "the applicable start date" — and a previously designated zone has no applicable start date. Notice 2026-40 §5.01(1) states the consequence directly: property acquired by a QOF or QOZB after December 31, 2026 cannot be qualified opportunity zone business property unless it is acquired for use in a zone designated after July 4, 2025, or an exception applies.
So the question for a sponsor is not "will my zone survive." It is: am I still buying property after this year, and will my tract be in the 2027 round? If the tract is re-designated, new acquisitions qualify normally from January 1, 2027. If it is not, you are down to two exceptions.
When did governors have to nominate Opportunity Zone tracts for the new map?
Governors had until September 28, 2026 to nominate, the end of the 90-day window that began July 1, 2026, and a governor who requested the thirty-day extension had until October 28, 2026 at the latest (Rev. Proc. 2026-14, section 2.02(3)(e); section 5.03 denies any change to a nomination after that date). Treasury’s thirty-day window to designate the nominated tracts then ends no later than November 27, 2026, or December 28, 2026 if the governor also requests its extension (section 2.02(3)(f)), with designations effective January 1, 2027.
Treasury’s CDFI Fund Opportunity Zones page had announced no 2027 designations when we read it on October 23, 2026. Treat any list of new zones circulating before Treasury publishes one as a forecast, unless the state itself reports Treasury’s approval: California’s Department of Finance has published its 620-tract list, effective January 1, 2027 (California’s Opportunity Zone 2.0 map).
The arithmetic is not comforting for incumbents. The eligible universe is 25,332 low-income communities, against at most 6,544 designations nationwide under the 25-percent limit in Rev. Proc. 2026-14 section 2.02(3)(c) (our count of its appendix), about 26 percent of the eligible tracts. Currently designated tracts compete against every other eligible tract for those slots, and at least one governor-facing planning guide recommends re-selecting only 40–50% of current high-performing zones while dedicating the rest to fresh areas. A current Opportunity Zone does not automatically become a new one. Plan for the possibility that yours does not, because you will not know in time to start over.
Exception one: does a working capital safe harbor plan adopted this year preserve qualification?
Notice 2026-40 §5.01(2) preserves qualification for property acquired after 2026 where a working capital safe harbor plan was already in motion. All four conditions must be met:
- A written working capital plan adopted on or before December 31, 2026.
- Acquisitions substantially consistent with that plan.
- The QOZB has received at least 10% of its total estimated working capital by December 31, 2026.
- The QOZB has expended at least 5% by that date — and amounts under a binding agreement entered before January 1, 2027 count as expended.
The same section extends comparable relief to new QOF equity issued after 2026 under such a plan, which matters for sponsors still raising. Because the working capital safe harbor runs on a 31-month clock, a plan adopted this year gives practical runway into roughly mid-2029.
This is the single most actionable item in this article. A written plan, funded to 10% and spent to 5% before year-end, is the difference between a project that can keep buying and one that cannot. It is also entirely within a sponsor's control right now.
Exception two: does replacement or modernization still qualify?
Notice 2026-40 §5.01(3) preserves qualification for "the replacement or modernization of property necessary to continue the operations of the trade or business." The exclusion is stated just as plainly: it does not cover "the expansion of a trade or business or the transition of a trade or business into a new trade or business."
The Notice's own examples draw the line usefully. Buying an adjacent warehouse in 2028 to add capacity for a new product line fails. Replacing windows, appliances, fixtures, cabinetry and flooring on apartment unit turns in 2028 and 2029 passes. A 2028 restaurant kitchen renovation with new ventilation and a new point-of-sale system passes.
Note what the passing examples have in common: they are exactly the short-life components a cost segregation study identifies. Appliances, cabinetry, readily removable flooring, specialty ventilation and point-of-sale equipment are 5-year personal property, not building shell. A sponsor operating under this exception is, in practice, buying the category of asset that carries the fastest depreciation — which is worth modeling deliberately rather than discovering afterward.
Where the cost segregation allocation does real work for a sponsor
Two places, and both are ordinary parts of a study rather than add-ons — the broader case for the pairing is in Cost Segregation + Opportunity Zones 2.0.
The substantial improvement test. Under §1400Z-2(d)(2)(D)(ii), additions to basis must exceed the property's adjusted basis over a 30-month period. The denominator excludes land — so the land-versus-building allocation determines the number you have to beat, and a smaller building basis is a lower bar. That allocation is the same one a cost segregation study already produces, which is why the two engagements belong together rather than in sequence. There is one important change here: OBBBA §70421(c)(4)(C) cut the rural threshold from 100% to 50%, effective on enactment July 4, 2025, and it reaches existing 2018 tracts — 3,309 of the 8,764 current zones are entirely rural, a shift taken apart in the rural Opportunity Zone windfall: a 30% step-up and a 50% improvement bar. The condition that must travel with that claim: the entire zone must be rural, not merely the parcel.
The depreciation schedule during the hold. A cost segregation study separates the building into 5-, 7- and 15-year components and the long-life shell, so short-life property depreciates quickly rather than over decades. Qualifying property can be expensed under §168(k) — 100% and permanent for property acquired after January 19, 2025, with earlier acquisitions on the TCJA phase-down, and Notice 2026-11 tying that acquired-date test to the date the written binding contract became binding rather than closing.
At exit the conditions matter more than the headline. After a ten-year hold, and only where the §1400Z-2(c) fair market value election is actually made, gain on a sale of the QOF interest is excluded to the extent the election applies, including gain attributable to depreciation taken during the hold. Before year ten, or without the election, recapture is entirely normal — §1245 ordinary recapture on personal property, and §1250 treatment on the building and its land improvements. Selling the interest and the fund selling assets are also different transactions; we work that through in the asset-sale exclusion article, and the broader interaction sits on our Opportunity Zone cost segregation page.
What survives regardless of the map
For a sponsor with capital already deployed, the protections are substantial and worth stating so the December date does not cause the wrong reaction:
- The ten-year election survives designation expiry. Notice 2026-40 §5.02(1) confirms, citing Treas. Reg. §1.1400Z2(c)-1(c), that the election is not impaired solely because a zone's designation ceases to be in effect — for dispositions before January 1, 2048.
- The substantial-use requirement is expected to get relief through December 31, 2047. Notice 2026-40 §5.02(2) says Treasury and the IRS expect forthcoming proposed regulations to let qualifying property acquired before the designation expires keep treating the expired zone as a zone for the substantial-use test through that date; it is an announced intent, not yet a regulation.
- The QOZB 50% gross-income and intangibles requirements are expected to get the same relief to the same date (§5.02(3), also announced, not yet a regulation), conditioned on the business having begun active conduct in the tract before expiry, or reasonably anticipating doing so under a qualifying plan.
- Substantial improvement already underway is unaffected. The 30-month clock runs on its own terms.
One honest caveat: the 90% asset test and the 70% tangible property test are not separately safe-harbored in the Notice. The better reading is that they do not need to be, because they operate on qualified opportunity zone business property and QOZB status, both of which the Notice’s announced relief covers. Several firm alerts flag the same gap without resolving it, and the proposed regulations the Notice promises do not yet exist — every safe harbor described here, other than the ten-year election rule already in Treas. Reg. §1.1400Z2(c)-1(c), is announced intent rather than a final rule.
Frequently Asked Questions
Does my Opportunity Zone investment lose its depreciation and exclusion benefits if the tract is not re-designated?
No, a tract that is not re-designated does not by itself end the depreciation or the §1400Z-2(c) ten-year election on an existing Opportunity Zone investment: existing designations run through December 31, 2028, the §1400Z-2(c) ten-year election is unimpaired by designation expiry for dispositions before January 1, 2048 under Treas. Reg. §1.1400Z2(c)-1(c), and Notice 2026-40 §5.02 announces that forthcoming proposed regulations are expected to extend relief for the substantial-use and QOZB requirements through December 31, 2047, an announced intent, not yet a regulation. What is lost is the ability to place new property acquisitions after December 31, 2026, absent an exception.
What exactly must be done before December 31, 2026 to keep acquiring property?
Adopt a written working capital safe harbor plan by that date, make acquisitions substantially consistent with it, have the QOZB receive at least 10% of total estimated working capital and expend at least 5% by year-end — with amounts under a binding agreement entered before January 1, 2027 counting as expended. All four conditions must be met.
How does a cost segregation study affect the substantial improvement test?
The test measures additions to basis against the property's adjusted basis excluding land, so the land-versus-building allocation sets the threshold you have to exceed. A cost segregation study produces that allocation as part of its ordinary work, and for a zone comprised entirely of a rural area the threshold is 50% rather than 100% of adjusted basis.
Can we still take bonus depreciation on property acquired under the replacement exception?
Yes, if the property meets the §168(k) requirements. Bonus is 100% and permanent for qualified property acquired after January 19, 2025, and follows the TCJA phase-down for earlier acquisitions, with Notice 2026-11 treating the acquired-date test as turning on the date the written binding contract became binding. The replacement and modernization exception is about Opportunity Zone qualification, and it does not by itself change depreciation eligibility.
Is renovating apartment units after 2026 an expansion or a replacement?
The Notice's example treats replacing windows, appliances, fixtures, cabinetry and flooring on unit turns as qualifying replacement or modernization. Buying an adjacent building to add capacity is treated as expansion and does not qualify. How far the exception tolerates partial-expansion facts is not addressed and remains open.
When will we know whether our tract made the 2027 map?
Treasury’s window to designate the nominated tracts ends no later than November 27, 2026 for a state whose governor took the nomination extension to October 28, 2026, or December 28, 2026 if the governor also requested the extension of Treasury’s window (Rev. Proc. 2026-14, section 2.02(3)(f)), and the new zones take effect January 1, 2027. Treasury’s CDFI Fund Opportunity Zones page had announced no 2027 designations when we read it on October 23, 2026. Every date, with the section of Rev. Proc. 2026-14 that sets it, is in the 2027 Opportunity Zone map deadlines under Rev. Proc. 2026-14.
Still deploying capital in a 2018-designated zone? Start your cost segregation study so the land-versus-building allocation and the depreciation schedule are settled while the working capital plan is being written.
Where a project also needs the property or a fund interest valued, Ellaval is ClickDrag Finance’s preferred vendor for valuation services — the entity to approach for fair market value valuations prepared for tax purposes, including estate and gift planning, impact fund investments and Opportunity Zone deals, working with CPAs and high-net-worth individuals. Reach Howard Krieger at howard@ellavoz.com.
