IRS Notice 2026-55, 2026-41 I.R.B. 1 (Sept. 2026).

The Department of the Treasury and the Internal Revenue Service issued Notice 2026-55 in Part III of the Internal Revenue Bulletin to request formal public and professional commentary regarding complex administrative and legal issues under Section 1400Z-2 of the Internal Revenue Code (I.R.C.). This notice directly addresses statutory modifications enacted under Section 70421 of Public Law 119-21 (139 Stat. 72, July 4, 2025), popularly known as the One, Big, Beautiful Bill Act (OBBBA).

As tax practitioners specializing in real estate transactions and capital gain deferral strategies evaluate the evolving statutory landscape, Notice 2026-55 serves as a crucial administrative benchmark. It signals the IRS’s intent to refine regulations governing Qualified Opportunity Funds (QOFs) and Qualified Opportunity Zone Businesses (QOZBs). The Treasury Department and the IRS specifically request that tax professionals “identify provisions of the § 1400Z-2 regulations or other guidance that should be retained, modified, or supplemented, and to describe in technical detail the legal analysis supporting any such changes based on the statutory text of § 1400Z-2 and other applicable provisions of the Code.”

Factual Background of Notice 2026-55

The statutory foundation of the Opportunity Zone regime was established under Section 13823 of Public Law 115-97 (131 Stat. 2054, Dec. 22, 2017), commonly referred to as the Tax Cuts and Jobs Act (TCJA), which added I.R.C. §§ 1400Z-1 and 1400Z-2. Technical modifications followed under Section 41115 of the Bipartisan Budget Act of 2018 (BBA 2018), Public Law 115-123 (132 Stat. 64, Feb. 9, 2018), which enacted special designation rules for Puerto Rico census tracts.

In early 2020, Treasury and the IRS promulgated comprehensive final regulations (T.D. 9889, 85 F.R. 1866, corrected at 85 F.R. 19082), codified at Treas. Reg. §§ 1.1400Z2(a)-1 through 1.1400Z2(f)-1. These regulations addressed core operational definitions, including eligible gains, the 180-day investment window, inclusion events, the 90-percent asset test for QOFs, the 70-percent tangible property requirement for QOZBs, original use, substantial improvement, leased property rules, and working capital safe harbors. In 2021, proposed regulations were issued regarding tax withholding under I.R.C. §§ 1445, 1446(a), and 1446(f) on deferred-gain transfers (86 F.R. 19585).

Subsequent to the enactment of the OBBBA on July 4, 2025, the IRS issued a series of administrative actions to implement statutory revisions:

Notice 2025-50 (2025-43 I.R.B. 542) defined “rural area” under I.R.C. § 1400Z-2(b)(2)(C)(ii) and clarified the reduced 50-percent substantial-improvement basis threshold for rural QOZ property.
Revenue Procedure 2026-14 (2026-20 I.R.B. 910) detailed state nomination procedures for population census tracts effective January 1, 2027.
Notice 2026-40 (2026-28 I.R.B. 33) provided transitional rules for investors spanning the December 31, 2026 cutoff, post-2026 property acquisitions, and ongoing QOF/QOZB operations following tract designation expirations.
Proposed Regulations issued on September 11, 2026 (91 F.R. 57968) introduced revised reporting requirements and updated QOF certification/decertification mechanisms under I.R.C. §§ 1400Z-2, 6039K, and 6039L.

Notice 2026-55 builds directly upon this administrative history while executing mandate requirements set forth in Executive Order 14394 of March 13, 2026, “Removing Regulatory Barriers to Affordable Home Construction” (91 F.R. 13207). Written comments submitted pursuant to the Notice are due by November 23, 2026, under Federal eRulemaking Portal Docket IRS-2026-1156.

Administrative Rationale for Requesting Comments

The primary catalyst for issuing Notice 2026-55 is the substantial statutory restructuring enacted under OBBBA Section 70421, which established permanent and modified incentives for post-December 31, 2026 investments. Key statutory amendments include:

Five-Year Inclusion Mandate: Under amended I.R.C. § 1400Z-2(b)(1)(B), deferred gain for qualifying investments made after December 31, 2026, must be recognized in gross income no later than five years after the investment date, replacing the fixed statutory inclusion date of December 31, 2026, found in prior law.
Enhanced Rural Step-Up: Under amended I.R.C. § 1400Z-2(b)(2)(B)(iii)(I), investments held for five years receive a 10-percent basis step-up, which increases to 30 percent for investments in Qualified Rural Opportunity Funds (QROFs).
Modified Ten-Year Election and Thirty-Year Cap: Amended I.R.C. § 1400Z-2(c) maintains the fair market value (FMV) basis step-up election for investments held for at least 10 years, but imposes a strict 30-year limitation. If sold prior to 30 years from the investment date, basis equals FMV on the sale date; if held for 30 years or longer, basis is mandatorily adjusted to FMV on the 30-year anniversary date.
Shifting Property Qualification Dates: Under amended I.R.C. § 1400Z-2(d)(2), the former static acquisition benchmark of “December 31, 2017” was replaced by an “applicable start date” for Qualified Opportunity Zone Business Property (QOZBP) and an “applicable date” for QOZ stock and partnership interests.

These statutory amendments created friction with existing regulatory safe harbors. Additionally, Executive Order 14394 directed Treasury and HUD to evaluate lawful administrative mechanisms to align I.R.C. § 1400Z-2 and New Markets Tax Credit (I.R.C. § 45D) incentives with single-family residential construction. The IRS issued Notice 2026-55 because statutory text alone does not resolve whether QOFs or QOZBs selling residential housing inventory can defer interim inventory gains upon reinvestment.

IRS Analysis of Existing Statutory Authority and Regulatory Precedent

The core legal analysis in Notice 2026-55 centers on the scope of statutory authority delegated under I.R.C. § 1400Z-2(e)(4) and general rulemaking authority under I.R.C. § 7805(a). Section 1400Z-2(e)(4) directs the Secretary to prescribe necessary regulations, including:

Rules for certifying QOFs under § 1400Z-2(e)(4)(A);
Rules “to ensure a QOF has a reasonable period of time to reinvest the return of capital from investments in QOZ stock and QOZ partnership interests, and to reinvest proceeds received from the sale or disposition of qualified opportunity zone property (QOZP)” under § 1400Z-2(e)(4)(B); and
Anti-abuse provisions under § 1400Z-2(e)(4)(C).

In analyzing whether regulations can permit interim gain deferral on inventory sales (such as single-family home development), the IRS highlights a significant conflict with its own regulatory precedent. The Service specifically notes that commenters must take into account “the preamble discussions of legal authority published in the Federal Register at 84 F.R. 18652, 18660 (May 1, 2019), and at 85 F.R. 1866, 1931-1932 (January 13, 2020), including the conclusion in the preamble to the 2020 final regulations that § 1400Z-2 permits gain deferral only at the QOF-owner level and that asset-level nonrecognition must arise under another provision of subtitle A of the Code.”

Under this historical reading, I.R.C. § 1400Z-2 is an owner-level deferral provision triggered exclusively by an eligible taxpayer investing realized capital gains into a QOF within 180 days pursuant to § 1400Z-2(a)(1). Section 1400Z-2(e)(4)(B) protects a QOF’s compliance with the 90-percent asset test under § 1400Z-2(d)(1) when proceeds are held in cash during a reasonable reinvestment window, but it does not suspend tax recognition of taxable gain realized upon the QOF’s or QOZB’s disposition of underlying assets. Unless an independent nonrecognition provision in Subtitle A applies (e.g., I.R.C. § 1031 or I.R.C. § 1033), such gains are recognized currently and allocated to QOF equity owners.

To reconcile Executive Order 14394 with this statutory framework, the IRS actively solicits detailed legal analyses on “what statutory or legal authority, including § 1400Z-2(e)(4)(B), the broader grants of authority in § 1400Z-2(e)(4) and § 7805(a), or any grant of authority under another provision of the Code, is there that would support regulations under which some or all income or gain realized by a QOF engaged in developing and selling single-family homes would be deferred from inclusion in gross income if the QOF reinvests the proceeds from selling its housing inventory into its trade or business within a reasonable period of time?”

Application of Statutory Provisions to Specific Transactions

Interim Gain Recognition and Reinvestment in Single-Family Housing

The IRS analyzes the practical application of I.R.C. § 1400Z-2 to inventory-selling businesses, contrasting dealers in real property with traditional buy-and-hold real estate operations. In applying the law to residential development, the IRS raises critical statutory mechanics:

Transaction Structure Variations: The Service requests analysis on whether the legal basis for deferral differs between “(i) income or gain from a QOF’s direct sale or disposition of housing inventory and (ii) gain from a QOF’s sale or disposition of QOZ stock or a QOZ partnership interest in a QOZB engaged in developing and selling single-family homes.”
Pass-Through Allocations: The IRS seeks input regarding “the authority under which inclusion in gross income of income or gain from the sale or disposition of housing inventory allocated to a QOF from a QOZB classified as a partnership for Federal income tax purposes could be deferred.”
Character, Basis, and Timing Limitations: If interim deferral were permitted, the IRS questions when deferred gain should ultimately be recognized, what holding-period and basis adjustments would apply, whether ordinary income generated from inventory under I.R.C. § 1221(a)(1) can retain its ordinary character or convert to capital gain, and whether definitions of QOZBP or substantial improvement under I.R.C. § 1400Z-2(d)(2)(D)(ii) would require regulatory amendment.
Ring-Fencing and Anti-Abuse: The Service queries whether deferral should be strictly “limited to businesses engaged in developing and selling single-family homes, rather than making it available to other inventory selling businesses,” and what administrable criteria and safeguards under § 1400Z-2(e)(4)(C) would prevent abuse.

Working Capital Safe Harbor Modifications and the Seventy Percent Test

Under I.R.C. § 1400Z-2(d)(3)(A)(ii) and I.R.C. § 1397C(b)(8), a QOZB must ensure that less than 5 percent of the average of its aggregate unadjusted bases is attributable to nonqualified financial property (NQFP). Section 1397C(e) excludes reasonable amounts of working capital held in cash, cash equivalents, or short-term debt instruments. Treas. Reg. § 1.1400Z2(d)-1(d)(3)(v) establishes the working capital safe harbor (WCSH), requiring a written plan, a 31-month schedule (extendable to 62 months for multiple safe harbors), and actual expenditure consistent with the plan.

Applying these rules to evolving business environments, the IRS identifies significant operational hurdles and requests comments on:

Plan Modifications: Whether a QOZB may modify a WCSH plan during execution, under what specific economic circumstances modifications are permissible, and whether a modified plan must remain “substantially consistent” with the original written plan.
Overlapping Safe Harbors: How modification rules apply when an entity utilizes sequential or overlapping safe harbor applications under Treas. Reg. § 1.1400Z2(d)-1(d)(3)(v)(E).
Interaction with the Seventy-Percent Tangible Property Standard: Under Treas. Reg. § 1.1400Z2(d)-1(d)(2), at least 70 percent of a QOZB’s owned or leased tangible property must qualify as QOZBP. The IRS seeks clarification on how expenditures of working capital assets on property that may not ultimately qualify as QOZBP affect overall compliance with the 70-percent standard.

Ten-Year Election Mechanics and the Thirty-Year Rule

For qualifying investments made after December 31, 2026, amended I.R.C. § 1400Z-2(c) mandates that the step-up in basis to fair market value for investments held at least 10 years is subject to a strict 30-year expiration.

The IRS analyzes the application of this statutory mandate, requesting technical feedback on:

Deemed Realization at Thirty Years: What rules should govern the time and manner of making the § 1400Z-2(c) election when an investment has not been sold or exchanged upon reaching the 30-year mark.
Valuation and Post-30-Year Basis: Valuation rules and substantiation standards required to establish FMV on the 30-year anniversary date, and how subsequent tax depreciation, amortization, appreciation, or loss should be calculated after basis is stepped up to FMV at year 30.
Pass-Through Entity Coordination: Specific modifications required for Treas. Reg. § 1.1400Z2(c)-1 regarding QOF partnerships and S corporations, particularly concerning tiered entity structures and asset-level sales versus interest-level sales.

Pass-Through Entity Distributions, Disguised Sales, and Inclusion Events

Applying deferral mechanics to complex partnership structures, the IRS targets unresolved technical issues under Treas. Reg. § 1.1400Z2(a)-1:

Sale or Exchange Requirement for Redeferral: Whether gain resulting from an inclusion event under Treas. Reg. § 1.1400Z2(a)-1(b)(11)(iv) should be eligible for redeferral only if the underlying event is formally characterized as a “sale or exchange.”
Debt-Financed Distributions and Losses: Clarifications regarding how debt-financed distributions under I.R.C. § 731 and debt-financed partnership losses impact the calculation of deferred gain under I.R.C. § 1400Z-2(b) and partner basis under I.R.C. § 752.
Disguised Sale Rule Refinements: Potential modifications to disguised sale provisions under Treas. Reg. § 1.1400Z2(a)-1(c)(2) when contributions of gain are coupled with partnership cash distributions.

Administrative Conclusions and Immediate Action Items for Tax Practitioners

Through Notice 2026-55, the IRS arrives at several definitive administrative conclusions:

Insufficiency of Existing Regulatory Framework: Current regulations under T.D. 9889 do not adequately accommodate inventory-based business models, single-family residential development, or the post-2026 statutory amendments under OBBBA.
Re-evaluation of Legal Authority Limits: The Treasury Department and the IRS are open to re-evaluating their prior administrative position regarding asset-level gain recognition, but will require robust, technically sound legal theories grounded in I.R.C. § 1400Z-2(e)(4) and I.R.C. § 7805(a) to justify any new deferral mechanisms for interim gains.
Imminent Administrative Guidance: The notice serves as a precursor to future Notice of Proposed Rulemaking (NPRM) and Treasury Decisions. Public comments submitted prior to the November 23, 2026 deadline will directly shape binding regulations.

For tax professionals advising clients with active QOF or QOZB structures, Notice 2026-55 highlights immediate planning considerations:

Re-evaluate Working Capital Safe Harbor Documentation: Review existing WCSH plans to verify compliance with Treas. Reg. § 1.1400Z2(d)-1(d)(3)(v), and exercise caution when executing plan variations prior to formal guidance on plan modifications.
Structure Residential Development Projects Defensively: Given that asset-level inventory sales currently generate recognized income allocated to partners, development projects should refrain from assuming interim-gain deferral until Treasury issues formal regulations.
Prepare Post-2026 Transition Models: Model client capital gain deferrals under OBBBA rules, taking into account the mandatory 5-year inclusion timeline under I.R.C. § 1400Z-2(b)(1)(B), the 30-percent basis step-up for QROFs, and the 30-year cap on FMV elections under I.R.C. § 1400Z-2(c).
Participate in the Administrative Process: Submit technical comments to Docket IRS-2026-1156 by November 23, 2026, providing specific transaction structures and statutory analysis to assist Treasury in drafting workable safe harbors.

Prepared with assistance from Gemini Notebook.