Reg. 1.355-7: Section 355(e) Plan Test and Safe Harbors

Under the Section 355(e) plan test and its safe harbors in Treasury Regulation 1.355-7, the IRS decides whether a tax-free spin-off and a 50-percent-or-greater stock acquisition are part of the same plan by weighing plan and non-plan factors across a four-year window, and it will not do so at all if the transaction fits within one of nine safe harbors. If the two are found to be part of a plan, the distributing corporation recognizes gain on the distributed stock as if it had sold it at fair market value. For a large spin-off, that consequence can reach hundreds of millions of dollars.

What Section 355(e) Does When a Plan Exists

Section 355(e) targets spin-offs connected to an acquisition of 50 percent or more of either the distributing corporation or the controlled corporation, measured by voting power or value. When the IRS finds a plan, the distributed stock loses its “qualified property” status, and the distributing corporation recognizes gain equal to the excess of fair market value over adjusted basis.¹

Two boundaries are worth noting up front. If the distributing and controlled corporations end up in the same affiliated group immediately after the plan is complete, Section 355(e) does not apply. And certain acquisitions never count toward the 50-percent threshold, including acquisitions of controlled corporation stock by the distributing corporation itself and acquisitions where every shareholder’s ownership percentage stays the same.¹

The Four-Year Window and the Presumption

The statute creates a rebuttable presumption that a distribution and an acquisition are part of the same plan if a 50-percent-or-greater interest is acquired during the four-year period that begins two years before the distribution and ends two years after it. Any qualifying acquisition inside that window shifts the burden onto the taxpayer to prove the two events were unconnected.¹

For post-distribution acquisitions that do not involve a public offering, the regulation adds a meaningful limit. A distribution and a later acquisition can only be part of a plan if there was an agreement, understanding, arrangement, or substantial negotiations regarding the acquisition at some point during the two-year period ending on the distribution date. If nobody was discussing the deal until well after the spin-off, no plan exists for that category of acquisition.²

The Plan Test: Weighing Facts and Circumstances

Outside the safe harbors, the IRS runs a facts-and-circumstances analysis. No single factor is decisive, and the regulation explicitly rejects a mechanical tally that compares the number of plan factors to non-plan factors. Each factor carries weight based on the specifics of the transaction.²

Plan Factors

The strongest plan factor is whether, during the two-year period ending on the distribution date, there was an agreement, understanding, arrangement, or substantial negotiations regarding the acquisition. Internal emails, board minutes, term sheets, and preliminary deal memos all become evidence. Other plan factors include whether the acquisition was a motivating reason for the distribution, whether the distribution was designed to make the acquisition easier, and whether the spin-off resolved a regulatory or business obstacle that would have blocked the deal.²

Non-Plan Factors

Non-plan factors show that the two transactions were genuinely independent. The strongest is a corporate business purpose for the distribution that has nothing to do with the acquisition, a concept the Supreme Court traced in Gregory v. Helvering when it held that a reorganization with no business purpose beyond tax avoidance falls outside the statute’s intent.³ Other non-plan factors include whether the distribution would have occurred at the same time and in the same form regardless of the acquisition, and whether the acquisition would have gone forward even without the distribution. A business purpose that remains compelling on the assumption that the acquisition falls through weighs heavily against a plan.²

What Counts as an Agreement or Substantial Negotiations

These definitions drive both the factor analysis and several safe harbor timing rules, so getting them right matters. An agreement, understanding, or arrangement does not require a signed contract. It exists when officers, directors, or controlling shareholders of the distributing or controlled corporation reach an understanding with an acquirer on the general terms of a deal. Informal consensus or a detailed letter of intent can qualify; the regulation focuses on substance, not legal formality.⁴

Substantial negotiations require discussions of significant economic terms, such as an exchange ratio in a reorganization or an acquisition price. Those discussions must involve people who can speak for the entities: officers, directors, or controlling shareholders on one side, and the acquirer or its authorized representatives on the other. Preliminary due diligence or exploratory conversations about strategic fit usually do not clear this bar. The line sits at the point where the parties begin discussing real deal economics.⁴

The Nine Safe Harbors

When a transaction fits within a safe harbor, the IRS cannot treat the distribution and acquisition as part of a plan, regardless of the surrounding facts. Every element must be satisfied for the protection to apply.

Post-Distribution Acquisitions

The first three safe harbors cover acquisitions that follow the spin-off.

Safe Harbor I applies when the distribution was motivated in whole or substantial part by a corporate business purpose unrelated to the acquisition, the acquisition occurred more than six months after the distribution, and no agreement or substantial negotiations regarding the acquisition existed during the period running from one year before to six months after the distribution.
Safe Harbor II applies when the distribution was not motivated by a purpose to facilitate the acquisition, the acquisition occurred more than six months after the distribution, no agreement or negotiations existed in the same one-year-before-to-six-months-after window, and no more than 25 percent of the acquired corporation’s stock was acquired or under negotiation during that window.
Safe Harbor III applies when no agreement regarding the acquisition existed at the time of the distribution and no agreement or substantial negotiations arose within one year after it.

Safe Harbors I and II share the same timing window but differ in what they require about business purpose and deal size. Safe Harbor III is simpler but demands a longer clean period after the spin-off.²

Pre-Distribution Acquisitions

Safe Harbors IV through VI protect acquisitions that occur before the spin-off.

Safe Harbor IV covers a non-public-offering acquisition that occurs before the first disclosure event regarding the distribution, unless the acquirer becomes a controlling or 10-percent shareholder or the acquisition involves 20 percent or more of the stock by vote or value.
Safe Harbor V applies to pro rata distributions where the acquirer bought distributing corporation stock after the public announcement of the spin-off and had no discussions with the corporation before that announcement. The same 10-percent-shareholder and 20-percent-acquisition limits apply.
Safe Harbor VI covers pre-distribution acquisitions involving a public offering, if the acquisition happens before the first disclosure event (for unlisted stock) or first public announcement (for listed stock).

These safe harbors share a common idea: if the acquirer bought stock before anyone was talking publicly or privately about the spin-off, it is hard to argue the acquisition was part of a coordinated plan.⁴

Routine Ownership Changes

The remaining safe harbors protect stock acquisitions that arise from ordinary corporate life rather than strategic deal-making. Safe Harbor VIII shields acquisitions of stock by employees or directors as compensation for services, so routine equity awards do not inadvertently trigger Section 355(e). Safe Harbor IX excludes acquisitions by qualified retirement plans, including 401(k) trusts. Acquisitions qualifying under Safe Harbors VII, VIII, and IX are also disregarded when calculating the 25-percent threshold in Safe Harbor II.²

Operating Rules That Shape the Analysis

Paragraph (c) of the regulation contains operating rules that clarify how common corporate events affect the plan analysis. Without these, ordinary business activity could create unintended plan exposure.

Internal discussions within the distributing or controlled corporation, including conversations with outside advisors, are not treated as discussions with an acquirer. Management can evaluate strategic options without that process becoming evidence of a plan. Those internal discussions may, however, serve as evidence of a business purpose for the distribution, which helps the taxpayer under the non-plan-factor analysis.⁵

Takeover defenses get specific attention. If the distributing corporation discusses a potential acquisition and then distributes controlled corporation stock specifically to make either entity less attractive as a target, the IRS treats the distribution as having a business purpose to facilitate the acquisition of whichever entity was likely to be acquired. A spin-off used as a poison pill does not escape plan treatment simply because the corporation was trying to block the deal.⁵

For publicly traded companies, the fact that a distribution made controlled corporation stock available for public trading, or increased trading activity in either company’s stock, is not evidence linking the distribution to an acquisition. Without this carveout, every public-company spin-off would face an automatic plan inference. Options are treated as exercised for the plan analysis if exercise would make the holder a five-percent shareholder, which stops parties from parking economic ownership in options to stay below the 50-percent line.⁵

Finally, the regulation tells everyone to ignore the tax consequences of Section 355(e) itself when evaluating intent. Any contractual indemnity where the controlled corporation promises to cover a 355(e) tax liability is disregarded too. The point is to keep the plan analysis focused on business motivations rather than the tax result.⁵

1
Office of the Law Revision Counsel. 26 USC 355 – Distribution of Stock and Securities of a Controlled Corporation
2
eCFR. 26 CFR 1.355-7 – Recognition of Gain on Certain Distributions of Stock or Securities in Connection With an Acquisition
3
Justia U.S. Supreme Court Center. Gregory v. Helvering, 293 U.S. 465
4
eCFR. 26 CFR 1.355-7 – Recognition of Gain on Certain Distributions of Stock or Securities in Connection With an Acquisition
5
eCFR. 26 CFR 1.355-7 – Recognition of Gain on Certain Distributions of Stock or Securities in Connection With an Acquisition