To qualify for tax-free treatment, a corporate restructuring has to do two things at once: fit within one of the seven transaction types defined in Internal Revenue Code Section 368, and satisfy the judicial doctrines layered on top by Treasury Regulation 1.368-1. The tax-free reorganization requirements are cumulative, not alternative. A deal that meets the literal statutory definition can still be recharacterized as a taxable sale if it fails the business purpose, continuity of business enterprise, continuity of interest, or step transaction tests. And even when the transaction qualifies, separate rules govern what consideration counts as stock, how any cash component is taxed, and how much of the target’s tax history the acquirer actually inherits.
Fitting a Section 368 Transaction Type
The statute recognizes seven reorganization forms. Three of them account for most acquisitions.
A Type A reorganization is a statutory merger or consolidation under state or federal corporate law. It is the most flexible on consideration: cash, notes, and assumed liabilities are all permitted alongside stock. The trade-off is procedural rigidity. The deal must follow the applicable merger statute, including shareholder votes and articles of merger filings. Because Type A imposes no statutory cap on boot, continuity of interest becomes the binding constraint.
A Type B reorganization is a stock-for-stock exchange. The acquirer must obtain control of the target solely in exchange for its own voting stock or the voting stock of its parent. Control means at least 80% of total combined voting power and at least 80% of the total shares of every other class. The “solely for voting stock” language is strict enough that even a small cash payment can blow the transaction. Continuity of interest is automatically satisfied because shareholders receive 100% stock, but the target must remain in existence as a subsidiary.
A Type C reorganization is a practical merger: the acquirer takes substantially all of the target’s assets in exchange for voting stock. Section 368(a)(2)(B) allows a limited boot relaxation, but voting stock must account for at least 80% of the fair market value of all target property acquired, and assumed liabilities count as boot for that calculation. In many deals, the liability assumption alone eats the entire cash allowance.
The Business Purpose Requirement
Reg. 1.368-1(b) requires a corporate business purpose behind the transaction. The doctrine comes from Gregory v. Helvering, in which the Supreme Court held that a transaction conforming to the statutory language but having “no business or corporate purpose” was “a mere device which put on the form of a corporate reorganization as a disguise for concealing its real character.”1Library of Congress. Gregory v. Helvering, 293 U.S. 465 (1935)
The purpose has to belong to the corporation, not to its shareholders. Deferring an individual’s personal capital gains does not qualify, even if the deal otherwise checks every statutory box. The IRS looks for a reason tied to the business itself: entering a new market, achieving operational efficiencies, consolidating management, raising capital.
The taxpayer carries the burden of proof. Vague references to “strategic synergies” will not hold up. The stated purpose should be specific, verifiable, and documented in contemporaneous board resolutions or internal memoranda that pre-date the structuring of the transaction. Tax-avoidance motives alongside a genuine business purpose are acceptable; tax avoidance standing alone disqualifies the reorganization.
Continuity of Business Enterprise
Reg. 1.368-1(d) requires the acquirer to either continue the target’s historic business or use a significant portion of its historic business assets in some business.2eCFR. 26 CFR 1.368-1 – Purpose and Scope of Exception of Reorganization Exchanges Only one of the two tests has to be met.
The Historic Business Test
This test asks whether the acquirer continues the target’s actual operations. If the target ran a single business, that business must continue. If it operated several lines, the acquirer needs to continue a significant one. Significance depends on the facts: the IRS weighs relative revenue, net income, and asset values.
One trap catches distressed acquisitions. If the target shut down its operations before the reorganization closed, there is no business left to continue, and this test fails automatically.
The Historic Asset Test
The alternative lets the acquirer change the business entirely, as long as it keeps using a significant portion of the target’s historic business assets in some active business. The test focuses on physical and operational assets central to the target’s business, not cash or liquid investments that can be freely redeployed.
The regulation does not fix a numerical threshold for “significant portion.” The IRS evaluates the retained assets’ relative importance to the target’s historic operations, so core assets weigh more heavily than peripheral holdings. Where the target is a holding company, the historic assets are the stock and securities of its operating subsidiaries, and COBE is satisfied if those subsidiaries continue their own historic businesses or keep using their own historic assets.
Remote Continuity and Partnerships
Post-closing restructuring does not automatically break COBE. If the acquirer controls (within the meaning of Section 368(c)) a chain of subsidiaries, the regulation treats the parent as holding all the businesses and assets of every member of that qualified group. Transferring acquired assets to a wholly owned subsidiary after closing is fine.
Partnerships get a narrower rule. The acquirer is treated as conducting a partnership’s business only if qualified group members together own a significant interest in it, or if one or more group members perform active and substantial management functions as a partner. The regulation does not set a bright-line percentage, but a small minority interest with no management role invites an IRS challenge.
Continuity of Interest
Continuity of interest is where most reorganizations succeed or fail. The doctrine ensures that the target’s former shareholders keep a real ownership stake in the combined enterprise rather than cashing out. The IRS treats COI as the principal tool for distinguishing a tax-free reorganization from a taxable sale.
COI is met when a substantial part of the total consideration paid to target shareholders is stock of the acquiring corporation. The rest can be cash or other property, commonly called boot, without disqualifying the deal (the boot itself is taxable to the recipients).
The Minimum Proprietary Interest
The IRS has historically treated COI as satisfied when target shareholders receive acquirer stock worth at least 40% of the total consideration. Courts have approved percentages as low as 38%, and in older cases as low as 25%. For advance ruling purposes, the IRS once required 50%, though that revenue procedure is no longer in effect. Most tax advisors treat 40% as the floor for comfort. Anything below 50% carries some risk.
The measurement is aggregate. One shareholder can take all cash while another takes all stock, so long as the total stock consideration clears the threshold.
The Signing Date Rule
Reg. 1.368-1(e)(2) sets the measurement date for deals with a binding contract and fixed consideration. Stock and other consideration are valued as of the last business day before the contract becomes binding, not the closing date. If the acquirer’s stock drops 30% between signing and closing, COI is still measured against the pre-signing value.
The rule applies only to fixed consideration. Floating pricing mechanisms fall outside it, leaving the parties exposed to whether COI actually clears at closing. Customary anti-dilution adjustments and cash-outs for fractional shares do not disqualify a contract from being treated as providing fixed consideration.
Pre-Acquisition Sales and Post-Closing Redemptions
Pre-acquisition sales can erode COI when they are part of the overall plan. A proprietary interest is not preserved when a person related to the acquiring corporation buys target stock for non-stock consideration in connection with the reorganization. Purchases by the acquirer’s affiliates or subsidiaries count against COI as if the acquirer had made them. Sales to unrelated parties are generally disregarded unless they are so close in time and so connected to the reorganization plan that the IRS treats them as part of the same transaction.
Post-closing activity matters too. If the acquirer redeems its own stock issued in the reorganization shortly after closing under a binding obligation or pre-existing plan, those shares count against COI and can disqualify the transaction. Ordinary market sales by former target shareholders, acting on their own without any prior arrangement with the acquirer, do not break COI.
The Step Transaction Doctrine
Reg. 1.368-1(a) states that reorganizations must be evaluated under “relevant provisions of law, including the step transaction doctrine.” The doctrine collapses a series of formally separate transactions into one when the steps are really pieces of a single integrated plan. Courts apply three tests:
- End result test: the steps collapse if they were designed from the outset to reach a specific end result. This is the broadest and most commonly applied test.
- Interdependence test: the steps collapse if each one would have been pointless without completion of the others.
- Binding commitment test: the steps collapse only if a binding commitment to complete all of them existed at the time of the first step. This is the narrowest test and is rarely invoked.
The doctrine cuts both ways. It can recharacterize an apparent reorganization as a taxable sale, and it can also save a deal by combining steps that individually fail to qualify but together satisfy the reorganization requirements.
What Counts as Stock: Nonqualified Preferred Stock
Not every equity instrument is treated as a proprietary interest. Section 354(a)(2)(C) provides that nonqualified preferred stock received in exchange for common stock or other qualified stock is treated as boot, not stock.3Office of the Law Revision Counsel. 26 USC 354 – Exchanges of Stock and Securities in Certain Reorganizations
Under Section 351(g)(2), preferred stock is nonqualified if it carries any of these features: the holder can force the issuer to redeem it, the issuer is required to redeem it, the issuer has a redemption right that is more likely than not to be exercised, or the dividend rate varies with interest rates or commodity prices. Those triggers apply when the right or obligation can be exercised within 20 years of issuance. Preferred stock that behaves like debt with a maturity date and a floating coupon does not count as a proprietary interest, whatever the parties label it.
How Boot Is Taxed When the Deal Qualifies
If a reorganization qualifies but shareholders receive a mix of stock and boot, Section 354 shields the stock portion and Section 356 governs the boot.4Office of the Law Revision Counsel. 26 USC 356 – Receipt of Additional Consideration
A shareholder recognizes gain, but only up to the amount of boot received. On a $50,000 built-in gain with $30,000 of cash boot, the recognized gain is $30,000, not the full built-in gain. Boot caps recognition; it does not multiply it.
Boot that has the effect of a dividend is taxed as dividend income to the extent of the shareholder’s ratable share of accumulated earnings and profits, with any remainder taxed as capital gain. Losses are never recognized in a reorganization exchange, even when boot is received.
Tax Attribute Carryovers and the Section 382 Limit
Qualifying reorganizations transfer tax attributes from the target to the acquirer under Section 381. Net operating loss carryovers move to the acquirer, but only to taxable years ending after the transfer date, and the first-year usable amount is prorated by the days remaining after the transfer.5Office of the Law Revision Counsel. 26 USC 381 – Carryovers in Certain Corporate Acquisitions Accumulated earnings and profits (or a deficit) transfer as of the transfer date; a target E&P deficit can only offset earnings the acquirer accumulates after that date. Capital loss carryovers move on the same prorated basis. The target’s accounting method carries over subject to any changes the acquirer must adopt. Section 381 applies in Type A, C, and certain Type D reorganizations, along with Section 332 subsidiary liquidations. It does not apply in Type B, because the target remains a separate subsidiary with its own attributes.
Section 381 transfers the losses; Section 382 often limits how much of them the acquirer can actually use. An ownership change occurs when 5-percent shareholders increase their aggregate ownership of a loss corporation by more than 50 percentage points over a rolling testing period, and most tax-free reorganizations qualify as equity structure shifts that can trigger the test.6Office of the Law Revision Counsel. 26 USC 382 – Limitation on Net Operating Loss Carryforwards and Certain Built-In Losses Following Ownership Change
After an ownership change, the annual amount of pre-change losses the new loss corporation can use is capped at the value of the old loss corporation multiplied by the long-term tax-exempt rate published monthly by the IRS. For ownership changes in early 2026, that rate is approximately 3.58%.7Internal Revenue Service. Rev. Rul. 2026-6 A $10 million target would generate roughly $358,000 of usable pre-change NOLs per year.
Section 382(c) adds a two-year continuity requirement. If the new loss corporation does not continue the old loss corporation’s business enterprise for the entire two-year period following the ownership change, the annual limitation drops to zero and the carryovers are wiped out. That requirement is separate from Reg. 1.368-1’s COBE test, though the two reinforce each other. Unused limitation carries forward to the next year, but the math still punishes acquirers who expected to absorb large loss carryovers quickly.
Reporting the Transaction on Form 8806
A corporation involved in a reorganization that results in an acquisition of control or a substantial change in capital structure must file Form 8806 with the IRS. The form is due within 45 days after the transaction, or by January 5 of the following year if that date is earlier. If the reporting corporation transfers substantially all of its assets to the acquirer and fails to file, the acquirer becomes responsible, and both corporations face joint and several liability for penalties.8Internal Revenue Service. Form 8806 – Information Return for Acquisition of Control or Substantial Change in Capital Structure
The penalty for a late or missing Form 8806 is $500 per day, up to $100,000, waivable for reasonable cause. Additional penalties under Sections 7203, 7206, and 7207 may apply for willful failures. The 45-day window is short enough that the form needs to be substantially prepared before closing.
The nonrecognition treatment itself comes from Sections 354 and 361. Section 354 shields shareholders exchanging target stock for acquirer stock. Section 361 does the same for the corporate transferor exchanging property for stock or securities of another party.9eCFR. 26 CFR 1.361-1 – Nonrecognition of Gain or Loss to Corporations Both provisions depend on the underlying transaction qualifying under Section 368 and clearing the Reg. 1.368-1 doctrines. Claiming nonrecognition without satisfying those requirements invites the IRS to recharacterize the entire deal as taxable.