A corporate divestiture is the sale, spin-off, or other disposal of a business unit, subsidiary, or set of assets by a company that no longer wants to own them. Companies divest to pay down debt, sharpen strategic focus, satisfy antitrust regulators, or exit an underperforming line. The structure chosen at the outset determines the tax bill, the regulatory path, and the liabilities that follow each party after closing. What follows walks through the four common structures, the federal obligations attached to each, and the filings that remain after the deal is done.
The Four Common Structures
Most divestitures take one of four forms. The choice is driven by tax treatment, how much control the parent wants to keep, and whether the buyer is a strategic acquirer or the public market.
Direct Asset or Business Unit Sale
The parent transfers specific assets, product lines, or an entire business unit to a buyer for cash, stock, or both. The seller picks which assets go and which liabilities the buyer assumes, which makes this the most customizable option. The tradeoff is complexity: each contract, permit, and asset may need its own legal transfer, and commercial contracts often require the counterparty’s consent before assignment. Where key contracts cannot be assigned, that fact shows up in the deal price.
Spin-Off
A spin-off creates a new, independent public company by distributing shares of a subsidiary to the parent’s existing shareholders. Shareholders end up holding stock in both companies without surrendering anything. The subsidiary gets its own board, management, and public listing. When the transaction meets the requirements of Section 355 of the Internal Revenue Code, shareholders recognize no taxable gain on the distribution, which is why spin-offs are a common way to separate large divisions.
Split-Off
A split-off also separates a subsidiary, but it asks shareholders to choose: exchange your parent shares for shares in the new entity, or keep what you have. That exchange reduces the parent’s outstanding share count, which can lift earnings per share for shareholders who stay. Split-offs work when management believes a distinct group of investors will value the subsidiary more highly on its own.
Equity Carve-Out
An equity carve-out sells a minority stake in a subsidiary to the public through an IPO while the parent keeps majority control. The parent raises cash and can still consolidate the subsidiary’s financials. Carve-outs sometimes serve as a first step toward a full spin-off, letting the market price the subsidiary before a complete separation.
Tax Treatment by Structure
Tax planning drives many structural choices, and on a large deal the difference between structures runs into hundreds of millions of dollars.
Corporate Gains on Asset Sales
When a corporation sells business assets at a profit, the gain is taxed as ordinary corporate income. Corporations do not get the reduced capital gains rate available to individuals. The federal corporate rate is a flat 21%, so every dollar of gain on a divested asset runs through that rate. Both buyer and seller must file IRS Form 8594, the Asset Acquisition Statement, whenever the transferred assets constitute a trade or business and goodwill or going-concern value could attach to them.1Internal Revenue Service. Instructions for Form 8594 (11/2021) Purchase price is allocated across seven asset classes using the residual method, starting with cash and ending with goodwill. How the parties allocate matters: the buyer wants more value assigned to depreciable or amortizable assets, while the seller usually prefers the opposite to minimize ordinary income.
Tax-Free Spin-Offs Under Section 355
A spin-off can be tax-free to both the corporation and its shareholders, but only if it clears several statutory hurdles. The distributing corporation must control the subsidiary immediately before the distribution, meaning at least 80% of the voting power and value of the subsidiary’s stock. The spin-off cannot be used primarily as a device for distributing earnings and profits. Both the parent and the subsidiary must be engaged in the active conduct of a trade or business immediately after the separation, with each business having been actively conducted for at least the five years leading up to the distribution.2Office of the Law Revision Counsel. 26 U.S.C. 355 – Distribution of Stock and Securities of a Controlled Corporation
The five-year active business test is where many proposed spin-offs fail. A subsidiary acquired within the past five years in a taxable transaction does not qualify. If the parent retains any stock in the subsidiary rather than distributing all of it, the IRS must be satisfied the retention was not part of a tax-avoidance plan. Fail any of these, and shareholders recognize taxable gain on the distributed shares as though they received a dividend.
When Regulators Force a Divestiture
Not every divestiture is voluntary. When a proposed merger or acquisition threatens competition, federal regulators can require the combined company to sell off parts of the business as a condition of approval.
The Clayton Antitrust Act prohibits any acquisition where the effect may be to substantially lessen competition or tend to create a monopoly in any line of commerce.3Office of the Law Revision Counsel. 15 U.S.C. 18 – Acquisition by One Corporation of Stock of Another The Federal Trade Commission and the Department of Justice share enforcement authority and review large transactions for competitive harm. Where the agencies identify a problem, they typically negotiate a consent agreement that specifies which business units, facilities, or product lines must be divested to preserve competition.4Federal Trade Commission. Premerger Notification and the Merger Review Process Refusing to comply can mean the entire merger is blocked or unwound.
Hart-Scott-Rodino Premerger Notification
The Hart-Scott-Rodino Act requires both parties to notify the FTC and DOJ before closing any acquisition above certain thresholds, then observe a waiting period while the agencies decide whether to investigate.5Office of the Law Revision Counsel. 15 U.S.C. 18a – Premerger Notification and Waiting Period The thresholds are adjusted annually based on changes in gross national product. For 2026, the minimum size-of-transaction threshold is $133.9 million, and transactions valued above $535.5 million require notification regardless of the parties’ size.6Federal Trade Commission. Current Thresholds
Filing fees are tiered by deal size. For 2026 they range from $35,000 for transactions below $189.6 million to $2,460,000 for transactions of $5.869 billion or more.7Federal Trade Commission. Filing Fee Information The waiting period is typically 30 days from filing, during which the agencies can request additional information that extends the review. A divestiture that is itself part of a larger merger, such as the sale of an overlapping product line to satisfy regulators, may trigger its own HSR filing if it independently crosses the thresholds.
Employee and Benefits Obligations
Divestitures that move a workforce carry obligations under federal labor and benefits law. Liability can shift between seller and buyer in ways parties routinely fail to plan for.
WARN Act Notice
The Worker Adjustment and Retraining Notification Act requires employers with 100 or more full-time employees to give at least 60 calendar days’ advance written notice before a plant closing that affects 50 or more workers, or a mass layoff affecting at least 50 employees and one-third of the site’s workforce.8U.S. Department of Labor. WARN Act Frequently Asked Questions In a divestiture, the seller is responsible for WARN notice for any qualifying event up to and including the closing date. After closing, that responsibility shifts to the buyer.9U.S. Department of Labor. WARN Advisor – What Am I Responsible for if I Sell My Business?
A sale creates a technical termination of employment, but WARN does not count it as an “employment loss” if the buyer retains the employees. Workers of the seller automatically become employees of the buyer for WARN purposes. Trouble arises when the buyer plans to restructure and reduce headcount shortly after closing, because the 60-day clock runs from the date of the planned layoffs, not the closing date. Buyers who wait until after closing to begin workforce planning can end up in violation.
COBRA Continuation Coverage
In an asset sale, responsibility for COBRA continuation coverage depends on whether the seller keeps operating a group health plan after the transaction. If the seller still maintains a plan for any employees, the seller’s plan must offer COBRA to qualified beneficiaries from the divested unit. If the seller stops offering any group health plan in connection with the sale, and the buyer continues the business operations without substantial change, the buyer becomes a successor employer and its plan takes over the COBRA obligation.10eCFR. 26 CFR 54.4980B-9 – Business Reorganizations and Employer Withdrawals From Multiemployer Plans The parties can allocate COBRA responsibility by contract, but if the contractually responsible party fails to perform, the obligation snaps back to whichever party bears it under the regulations.
Pension Plan Transfers
When the divested business participates in a multiemployer pension plan, any merger or transfer of plan assets and liabilities must satisfy federal rules that protect participants. An enrolled actuary must perform valuations of the plans involved. No participant’s accrued benefit can be reduced as a result of the transfer, and the receiving plan must demonstrate solvency. The plan sponsor must notify the Pension Benefit Guaranty Corporation before the transfer takes effect.11eCFR. 29 CFR Part 4231 – Mergers and Transfers Between Multiemployer Plans For single-employer defined benefit plans, the analysis turns on whether the buyer assumes the plan or whether the seller terminates or freezes it before closing. Underfunded pension liabilities are among the most heavily negotiated items in any divestiture involving unionized workforces.
Environmental Liability
Where the divested assets include real property, manufacturing facilities, or anything involving hazardous materials, environmental due diligence is not optional. Under CERCLA, both current and former owners or operators of a facility where hazardous substances were released can be held liable for the full cost of cleanup.12Office of the Law Revision Counsel. 42 U.S.C. 9607 – Liability As a general rule, an asset purchaser does not automatically inherit the seller’s CERCLA liabilities, but courts recognize several exceptions: fraud, an express or implied assumption of liabilities, a transaction structured as a de facto merger, or a situation where the buyer is essentially a continuation of the seller’s business.13Environmental Protection Agency. Liability for Environmental Cleanup
Buyers protect themselves by conducting Phase I and Phase II environmental site assessments before closing. These assessments satisfy the “All Appropriate Inquiries” standard that is a prerequisite for the innocent landowner defense and the bona fide prospective purchaser exemption under CERCLA. A buyer who skips this step or cuts corners loses access to both defenses if contamination surfaces later.
Executing the Transfer
Once structure, price, and key terms are agreed, the deal moves into execution. A divestiture is not a single transaction but a coordinated set of transfers, and several pieces of the mechanics matter to both sides.
The Purchase Agreement and Closing
The definitive agreement, usually an asset purchase agreement, specifies which assets transfer, which liabilities the buyer assumes, the representations and warranties each party makes, and the conditions that must be satisfied before closing. Signing and closing are separate events: closing may not happen for weeks or months while regulatory approvals, third-party consents, and financing conditions are worked through. At closing, the parties execute deeds, bills of sale, and intellectual property assignments; funds move from buyer to seller, typically through escrow; and government permits and licenses may need to be transferred or reissued on the agencies’ own timelines.
Transition Services Agreements
Because a divested unit’s operations are often deeply intertwined with the seller’s infrastructure, the buyer frequently needs the seller to keep providing certain services after closing. A transition services agreement covers functions like IT systems, payroll processing, accounting support, or facility access for a defined period while the buyer builds its own capabilities. These agreements are negotiated alongside the purchase agreement and typically include service-level standards, pricing (usually at cost or cost-plus), and a hard expiration date that forces the buyer to complete the separation.
Indemnification and Escrow
The purchase agreement almost always includes indemnification provisions under which the seller agrees to compensate the buyer for losses arising from breaches of representations and warranties, undisclosed liabilities, or specific known risks. To give the buyer a practical remedy, a portion of the purchase price is deposited into escrow or held back by the buyer. In most private transactions, the escrow or holdback is less than 10% of the purchase price and is released after a defined period, often 12 to 18 months, assuming no outstanding claims. Sellers push to make the escrow the exclusive source for indemnification recoveries, which effectively caps their exposure.
Non-Compete Restrictions
Buyers in a divestiture typically require the seller to agree to a non-compete provision preventing the seller from re-entering the same line of business for a specified period and within a defined geography. Courts evaluate these restrictions under a rule of reason analysis, and they must be reasonably related to the scope of the business and goodwill actually acquired. A non-compete that extends to geographic areas or product lines the seller was never involved in risks being struck down or narrowed.
Filings That Come After Closing
Closing the deal does not end the regulatory workload. Several federal agencies require filings or notifications triggered by completion of the transaction.
SEC Form 8-K
Publicly traded companies must file a Form 8-K with the Securities and Exchange Commission within four business days of completing the disposition of a significant amount of assets. A disposition qualifies as significant if the net book value of the assets or the amount received exceeds 10% of the company’s total consolidated assets.14U.S. Securities and Exchange Commission. Form 8-K The filing discloses the nature of the assets, the identity of the buyer, the consideration received, and any material relationships between the parties.
IRS Reporting
The seller reports capital gains or losses from the transaction on Form 8949, with totals carried to Schedule D.15Internal Revenue Service. Topic No. 409, Capital Gains and Losses Where the transaction involves a group of assets constituting a trade or business, both buyer and seller must also file Form 8594 with their tax returns for the year of the sale.1Internal Revenue Service. Instructions for Form 8594 (11/2021) The allocation of purchase price across asset classes on Form 8594 should be consistent between the parties. Inconsistent allocations invite IRS scrutiny of both returns.
CFIUS Review for Foreign Buyers
When the buyer is a foreign person or entity, the transaction may be subject to review by the Committee on Foreign Investment in the United States. The CFIUS review process is largely voluntary, but mandatory declarations are required in two situations: when a foreign government is acquiring a “substantial interest” in certain types of U.S. businesses, and when the transaction involves critical technologies as defined by the CFIUS regulations.16U.S. Department of the Treasury. CFIUS Overview Even where filing is not mandatory, CFIUS retains the authority to review any transaction that could result in foreign control of a U.S. business and can unwind completed deals it finds threatening to national security. Companies divesting sensitive technology or defense-related operations to foreign buyers should treat CFIUS review as a practical certainty.