Opportunity Zones 2.0: the working advisory brief.

§1400Z-1 is the designation statute

This section defines what a Qualified Opportunity Zone is, gives governors the nomination authority, and assigns Treasury the certification role. It built the original 8,764-tract footprint from 2018 low-income community census tracts. Under OBBBA, §1400Z-1 is also where the rolling 10-year redesignation cycle now lives, with the first redesignation cycle beginning July 1, 2026.

§1400Z-2 is the investment statute

This is the entire tax engine: the 180-day rollover, the deferral of recognized gain, the basis step-ups, the 10-year fair-market-value election, the Qualified Opportunity Fund structure, and the working-capital and substantial-improvement mechanics that govern QOZ Business Property. Every benefit an investor actually claims runs through §1400Z-2 mechanics.

What the regulations actually do

• Define eligible gain. Capital gains and §1231 net gains qualify. Ordinary income recapture under §1245(a) and §1231(c) does not. This regulatory choice preserves §1231 rollover capacity even when individual asset sales would otherwise produce ordinary income.
• Set the 180-day clocks. Pass-through partners and S corp shareholders get election flexibility: start the 180 days on the date of the partnership-level recognition, the last day of the partnership's tax year, or the due date of the partnership return without extensions. Installment sales get parallel flexibility.
• Build out the substantial improvement test. Reg. §1.1400Z2(d)-2 confirms the doubling-the-basis rule applies to improvements only, with land excluded from the denominator. This regulatory choice is what makes OZ deals on land-heavy parcels feasible at all.
• Operationalize the working capital safe harbor. The regulations stretched the original 31-month safe harbor to up to 62 months for staged projects with multiple infusions, provided there is a written plan and schedule. This is the single most important practical provision for ground-up development.
• Build the 10-year exit mechanics. The final regs added asset-sale flexibility so that QOFs and QOZBs can sell underlying assets after year 10 (not only investor-level interest sales) and still get fair-market-value step-up treatment, with the QOF passing the gain through tax-free.
• Govern inclusion events. The regulations enumerate what triggers early recognition of deferred gain: distributions exceeding basis, cessation of QOF status, certain transfers, and dissolution events.

The inclusion event taxonomy

An inclusion event is the regulatory term for any transaction that reduces or terminates a taxpayer's qualifying investment in a QOF. When one occurs, deferred gain becomes recognized in that tax year. The four most common triggers, in plain language:

• Sale or exchange of QOF interest. Any disposition that reduces equity. Partial sales trigger partial inclusion proportionate to the equity given up. Sales after year 10 with valid FMV election are excepted.
• Distribution exceeding basis. A QOF partnership distribution that exceeds the partner's basis in the qualifying investment. Initial basis is zero, so early distributions almost always trigger partial inclusion. The most common operational landmine in OZ practice.
• Gift or charitable transfer. A lifetime gift of a QOF interest is an inclusion event. Transfer at death is not, which inverts the usual estate planning instinct: hold to death is materially better than gift during life for QOF interests.
• QOF decertification. Voluntary or involuntary loss of QOF status triggers inclusion for all investors. Repeated failure to meet the 90% asset test, or a self-decertification election, both qualify.

The working capital safe harbor

The 62-month working capital safe harbor under Reg. §1.1400Z2(d)-1(d)(3)(v) makes ground-up development feasible. Without it, cash held by a QOZB awaiting deployment would fail the asset tests almost immediately. The safe harbor lets a QOZB hold cash, cash equivalents, and short-term debt instruments outside the qualifying-asset calculation for up to 31 months, extended to 62 months for staged projects with multiple capital infusions, provided each infusion has its own written plan and schedule and the later infusions were contemplated in the initial plan.

The QROF structure: a parallel fund category

OBBBA created the Qualified Rural Opportunity Fund (QROF), a new fund category that mirrors a QOF except that its 90% asset test must be satisfied with property located in a QOZ comprised entirely of a rural area. The basis step-up follows the fund classification: standard QOFs get 10% at year five, QROFs get 30%.

Other structural shifts

• Permanent program with rolling redesignation. The 2026 sunset is gone. Governors propose new tracts every 10 years; Treasury certifies them. The first new cycle starts July 1, 2026. Tract durability becomes a real underwriting question for anything held past 2028.
• Rolling 5-year deferral. For investments made after 2026, the deferred gain recognition date floats with each investor's anniversary rather than being pinned to a single statutory date. The basis step-up standardizes at 10% immediately before the end of the five-year deferral. The old extra 5% at seven years is eliminated.
• 30-year basis cap on the FMV election. OBBBA replaces the 2047 sunset with a 30-year rolling cap. Investments held more than 30 years freeze the basis step-up at the FMV on the 30th anniversary. For most operating real estate, this is a non-event. For long-hold land or generational positions, it matters.
• Reporting teeth. Annual informational returns are now mandatory. Penalties run up to $10,000 per return for ordinary funds and $50,000 per return for QOFs with more than $10 million in assets, with daily fines of $500 for late or incomplete returns.

The three exit paths

• Path A: Investor sells QOF interest. The classic exit. Investor disposes of qualifying QOF interest after 10-year hold and elects FMV step-up under §1400Z-2(c). Cleanest for partnership and S-corp QOFs. Buyer takes new basis in QOF interest; underlying QOZB and QOZBP unchanged.
• Path B: QOF sells assets. Multi-asset QOF sells one or more underlying QOZ business properties. Gain passes through tax-free to investors who held 10+ years. Enables multi-asset QOF structures. Inventory gain not excluded; ordinary recapture is excluded. The QOF can reinvest proceeds within 12 months without breaking the 90% test.
• Path C: QOZB sells assets. Subsidiary QOZB partnership sells property. Gain flows through QOF to investors. After 10 years, fully excluded except inventory. Useful when the buyer wants assets rather than entity. The QOZB-level 12-month reinvestment is not available; that relief is QOF-only.

One exception to know

The final regulations exclude one category from the year-10 FMV benefit: inventory sold in the ordinary course. Everything else, including ordinary recapture under §1245 that would normally be ordinary income on a regular sale, gets the favorable treatment. For operating businesses inside a QOZB, the inventory carve-out matters. For real estate alone, it usually does not.

The five QOZB tests

For an operating business to qualify as a QOZB and let the QOF holding it count toward the 90% asset test, all five of these have to be true. Continuously. Tested at each fiscal year end.

The excluded categories under §144(c)(6)(B)

The seven categories that cannot constitute the QOZB's principal trade or business or generate 5% or more of its gross income. The list is statutory, not regulatory, which means it cannot be softened by Treasury guidance.

What OZ 1.0 actually taught us

The QOF structure scales down cleanly. A single investor, a family, or a small group of three to seven aligned co-owners can form a QOF, run it as a directly-held vehicle, and never need an outside LP. The same regulations apply. The same benefits attach. The difference is governance and capital efficiency, not legal availability.