What Is a Spin-Off? Definition, Tax Rules, and How It Differs From a Carve-Out or Divestiture (2026)

What Is a Spin-Off? Definition, Tax Rules, and How It Differs From a Carve-Out or Divestiture (2026)

Last updated: August 2026

Quick answer. A spin-off is when a parent company distributes the shares of a subsidiary pro-rata to its existing shareholders, creating a separate publicly listed company. No cash goes to the parent; if you held the parent, you now hold two stocks. That is the feature that separates a spin-off from a divestiture (an outright sale for cash), a split-off (an elective exchange of parent shares for subsidiary shares), and an equity carve-out (a minority-stake IPO that raises cash). "Divesting" is the umbrella word for all of these. A spin-off can be tax-free under IRC Section 355 if the parent distributes at least 80% of voting power and 80% of each non-voting class, both sides run an active trade or business for the prior five years, and the deal clears the device and business-purpose tests. Recent examples: Comcast → Versant (effective January 2, 2026, 1-per-25), 3M → Solventum (April 1, 2024, 1-per-4), and GE's three-way split.

I'm Sean Yu, co-founder of Peony, a data room company. I don't run corporate separations — I watch the deal teams that do open rooms with us, and I read the filings, because the vocabulary around separations is used loosely everywhere and it is almost always wrong in the press. "Spin-off" gets applied to transactions that are actually carve-outs, split-offs, or plain sales, and the tax treatment gets reported as folklore. This post is the definitional map: what a spin-off actually is, how it differs from every neighbor in the separation family, and the tax rule that decides whether shareholders get a tax bill.

Every load-bearing fact below links to a primary source — an SEC filing mirrored on the company's own investor-relations site, or a law-firm memo quoting the rule. If you are the corp-dev or private-equity reader who has passed the definition and needs the room mechanics — perimeter files, carve-out financials, TSA schedules — this post routes you to the operational guides at the end rather than repeating them.

What is a spin-off?

A spin-off is when a parent company distributes shares of a subsidiary pro-rata to its existing shareholders, creating a separate, publicly traded company. The defining features are two: the distribution goes to the parent's own shareholders in proportion to what they already hold, and no cash goes to the parent. If you owned 100 shares of the parent, after the spin-off you own those same 100 parent shares plus a set number of shares in the new company — you now hold two stocks instead of one, and no new investor bought in.

That "no cash to the parent" point is the one worth anchoring on, because it is what separates a spin-off from almost everything it gets confused with. A spin-off is not a fundraising event and not a sale; it is a restructuring that hands an existing business directly to the people who already owned it, as an independent company they can now value and trade on its own.

The most recent large completed example makes the mechanics concrete. Comcast completed the spin-off of Versant Media Group — its cable networks including USA, CNBC, MSNBC (now MS NOW), E!, SYFY, and Golf, plus Fandango and Rotten Tomatoes — effective 11:59 p.m. Eastern on Friday, January 2, 2026. Versant began regular-way trading on Nasdaq under the ticker VSNT on January 5, 2026, and Comcast shareholders received one Versant share for every 25 Comcast shares they held, with a record date of December 16, 2025. No Comcast shareholder wrote a check; they simply woke up owning a slice of a new standalone media company.

One vocabulary note before we go further: in the UK, Europe, and much of the Commonwealth, the same transaction is called a demerger. It is not a different structure — just a different word, which matters when you are reading a London filing next to a New York one.

What does "divesting" mean, and how does a spin-off differ from a divestiture?

"Divesting" (or divestment) is the umbrella term for a company shedding a business unit by any method — it is the parent category, not a specific transaction. A company can divest in several structurally different ways, and the word "divesting" alone does not tell you which one, or whether cash comes in. The four that matter, and how they differ, are worth laying side by side.

Read down the "cash to parent" column and the family sorts itself. A spin-off and a split-off raise no cash — they hand the business to shareholders. An equity carve-out and a divestiture both bring cash in — one from public-market IPO investors, the other from a single buyer.

So how does a spin-off differ from a divestiture specifically? A divestiture is an outright sale of a business unit for cash to a strategic acquirer or a private-equity firm. The parent gets money; the buyer gets the business; and the unit leaves the parent's shareholder base entirely. A spin-off transfers no cash and keeps the same shareholders — they simply own the divested business directly now, as a separate stock, instead of indirectly through the parent. If your mental test is "did the parent get paid, and did the business leave the shareholders?", a divestiture is yes-and-yes; a spin-off is no-and-no.

The two remaining structures fill in the middle. A split-off is elective: instead of distributing subsidiary shares to everyone automatically, the parent offers shareholders the chance to exchange their parent shares for subsidiary shares — a tender-style exchange offer. Because parent shares are handed back and retired in the swap, a split-off reduces the parent's outstanding share count, which a plain spin-off does not. An equity carve-out is a partial move: the parent sells a minority stake via an IPO of the subsidiary, so cash does come in, and the parent typically still controls the unit afterward. A carve-out is frequently just the first step of a longer separation — float a slice to raise cash and establish a market price, then complete the separation later with a spin-off or split-off.

Are spin-offs taxable? The Section 355 rules

A spin-off can be tax-free to both the parent and its shareholders — but only if it satisfies Internal Revenue Code Section 355. If it fails, the distribution can be taxed as a dividend to shareholders or trigger corporate-level gain, which is why large public spin-offs are engineered around these rules from the start. The core requirements, kept to the load-bearing core, are four.

• Control. The parent must control the subsidiary immediately before the distribution and must distribute stock representing control — defined as at least 80% of the total voting power and at least 80% of each class of non-voting stock of the subsidiary.
• Active trade or business (ATB). Both the parent (the "distributing" company) and the spun-off entity (the "controlled" company) must be engaged in an active trade or business that was conducted throughout the five-year period before the distribution. You cannot spin off a passive holding of assets and get tax-free treatment.
• Device test. The transaction must not be principally a "device" for distributing the parent's earnings and profits — i.e., it cannot be a dressed-up way to bail out E&P at capital-gains rates instead of paying a taxable dividend.
• Business purpose. The spin-off must be motivated by a real corporate business purpose, not solely by tax avoidance.

Those four — 80%/80% control, five-year active trade or business on both sides, the device test, and business purpose — are the safe, exact core. There are additional requirements in the doctrine (continuity of interest and continuity of business enterprise, among others), but the four above are the ones the governing guidance turns on: §355 lets a corporation make a tax-free distribution of a controlled subsidiary's stock "provided that the transaction is being carried out for a legitimate business purpose and is not being used principally as a device to bail out earnings and profits," with control defined as at least 80% of voting power and 80% of all other classes of stock.

A practical implication worth flagging: this is why you sometimes see a parent retain a stake after a "spin-off"-adjacent deal (3M kept 19.9% of Solventum, for instance) — the retained slice can be monetized later, but the parent has to be careful that the piece it distributes still clears the 80% control threshold for the tax-free distribution to work.

What is a Reverse Morris Trust?

A Reverse Morris Trust (RMT) is a structure that lets a parent combine a business with a specific merger partner tax-free. The parent first spins off the target business to its own shareholders — tax-free under Section 355 — and the spun-off entity immediately merges with the desired partner. The economic effect is that the parent hands a division into a merger without triggering corporate tax on the way out.

The load-bearing rule is the ownership split. For the RMT to preserve tax-free treatment, the original parent's shareholders must end up owning more than 50% of the combined company. If they own 50% or less, Section 355(e) — the "anti-Morris Trust" rule — steps in and taxes the spin-off at the corporate level. As the reference framing puts it, a spin-off will be taxable at the corporate level if the distribution is part of a plan under which one or more persons acquire 50% or more of the stock of either the distributing company or the spun-off company. That "more than 50%" line is the whole ballgame — it is what forces RMT deals to be structured so the parent's holders remain the majority of the merged entity.

What are real spin-off examples?

The clearest way to learn the vocabulary is against real, dated deals. Here are the recent large-cap separations, with the structure named precisely — because several of them are not the plain spin-off the headlines called them.

• General Electric — a three-way breakup. GE separated into three companies. GE HealthCare separated on January 3, 2023. Then GE Vernova (power and energy) and GE Aerospace (the renamed parent, ticker GE) both began regular-way trading on April 2, 2024, with GEV listing on the NYSE. The distribution was one GE Vernova share for every four GE shares, record date March 19, 2024. This is the textbook clean multi-spin.
• 3M → Solventum — a clean pro-rata spin. 3M completed the spin-off of its healthcare business, Solventum, on April 1, 2024. Solventum trades on the NYSE as SOLV, the distribution was one Solventum share per four 3M shares, and 3M retained 19.9% to monetize within five years. Intended to be tax-free to 3M shareholders.
• GSK → Haleon — a UK demerger. GSK completed the demerger of its consumer-health business, Haleon, on Monday, July 18, 2022. Haleon was admitted to the London Stock Exchange (LSE: HLN), ADSs began NYSE trading July 22, 2022, and holders received one Haleon share for each GSK share held. "Demerger" is simply the UK word for the same transaction.
• Comcast → Versant — the freshest completed spin. As covered above, Comcast completed the spin-off of Versant Media Group effective January 2, 2026; VSNT began trading on Nasdaq January 5, 2026; one Versant share per 25 Comcast shares.
• Honeywell — the three-way split, now complete. Honeywell split into three. Its Solstice Advanced Materials spin-off completed on October 30, 2025, and its Aerospace Technologies separation completed on June 29, 2026 — Honeywell Aerospace now trades on Nasdaq as HONA. With both out the door, the split Honeywell announced in early 2025 is done.

Note what these have in common: no cash to the parent, shares distributed to existing holders, and a defined ratio. Now for the deal that is constantly mislabeled.

Why is Kenvue not a spin-off? The two-step teaching case

Johnson & Johnson's separation of its consumer-health business, Kenvue, is the most useful example in this whole post precisely because it is the one people get wrong. It is routinely called a "spin-off." It was not a plain spin-off. It was a carve-out IPO followed by a split-off exchange offer — two of the structures from the table above, run in sequence. Teaching the two steps is the point.

Step one — the equity carve-out (May 2023). J&J took Kenvue public through an IPO, but sold only a minority stake. J&J retained approximately 89.6% of Kenvue's shares (1,716,160,000 shares). This is a carve-out by definition: cash came in to J&J from IPO investors, and the parent kept control. At this stage Kenvue was a listed company that J&J still overwhelmingly owned.

Step two — the split-off exchange offer (launched July 24, 2023). To dispose of the remaining stake, J&J did not distribute the shares pro-rata (that would have been a spin-off). Instead it launched an exchange offer: J&J shareholders could elect to swap their J&J shares for Kenvue shares, at a 7% discount — J&J stated holders would receive approximately $107.53 of Kenvue stock for every $100 of J&J stock tendered, subject to an upper limit of 8.0549 Kenvue shares per J&J share. That exchange offer expired on August 18, 2023, after which Kenvue became fully independent. Because parent shares were tendered and retired, this was a split-off, not a spin-off.

The reason this matters beyond pedantry: the structure changes who ends up owning what and how the parent's share count moves. A spin-off is automatic and pro-rata and leaves the parent's share count alone. Kenvue's two-step was elective (shareholders chose whether to exchange) and it reduced J&J's outstanding shares. Same goal — full separation — completely different mechanics. When a filing says "exchange offer" or "IPO of a minority stake," it is telling you this is not a plain spin-off, no matter what the headline says.

Why do companies spin off divisions?

Companies spin off divisions so that each business can be valued, capitalized, and managed on its own terms — and the clearest evidence that boards believe this is the wave of large-cap breakups from 2023 through 2026. The motives cluster into a few durable themes.

The first is the conglomerate discount. Markets frequently value a diversified group at less than the sum of its parts, because investors who want exposure to one business are forced to buy all of them. Separating the units lets each trade as a pure play, which can re-rate the pieces higher than the whole. A slower, cash-generative business and a fast-growing one attract different investor bases, and neither is served well by being bolted together.

The second is management focus and capital allocation. Different businesses need different incentives, different balance sheets, and different reinvestment rates. Splitting them lets each management team run its own strategy and be measured on its own metrics rather than being cross-subsidized or starved inside a portfolio. The third is external pressure — activist investors frequently push for separations to unlock value, and regulatory or portfolio-fit questions can make a clean break the simplest answer.

You do not need an invented statistic to see the pattern; the named deals are the evidence. GE split into three (HealthCare, Vernova, Aerospace). Johnson & Johnson separated Kenvue. 3M spun off Solventum. Honeywell split into three, completing Solstice in October 2025 and Aerospace in June 2026. Comcast spun off Versant in January 2026. Five household-name industrial and consumer giants, all deciding within a few years that focused companies attract clearer valuations than sprawling ones. That cluster is the strongest available signal that the "break up the conglomerate" thesis is live in boardrooms right now — no aggregate count required.

Where do separations actually run — and where does Peony fit?

Every one of these transactions runs on document infrastructure long before the ticker changes. A separation is a data problem first: you have to define the perimeter (which contracts, employees, and assets travel with the spun-off business versus staying with the parent), assemble carve-out financials (the standalone historicals that never existed while the unit was buried inside the parent), and paper the transition service agreements (the TSA schedules that keep the two companies operationally entangled for months after the split). That work happens in a data room, whether the buyers are IPO investors, a merger partner in a Reverse Morris Trust, or the diligence teams on a sale.

That is the one place Peony touches this topic, and I will keep it narrow. I run Peony, a data room company used by 6,800+ customers, and separations are exactly the kind of multi-counterparty, months-long process our flat pricing suits — the Data Room plan is $52 per admin per month for unlimited rooms with viewers always free, so adding another bidder's analyst or a carve-out accountant never changes the bill. But this is a glossary post, not a room manual. The operational mechanics — the perimeter problem, the entanglement map, the stranded costs, the two-audience wall — live in two dedicated guides: corporate divestiture data room for divestitures and carve-outs generally, and carve-out data room for the carve-out case specifically. If you are past the definition and building the room, follow those. This post's job was the vocabulary, and 6,800+ customers is the last Peony number you will read here.

This post is general information, not legal or tax advice — whether a specific separation qualifies under Section 355, and how it is taxed, is a question for your tax counsel.

Frequently asked questions

What is a spin-off?

A spin-off is when a parent company distributes the shares of a subsidiary pro-rata to its existing shareholders, creating a separate, publicly listed company. No cash changes hands and no new investor buys in — if you owned the parent, you now own two stocks: your original parent shares plus new shares in the spun-off company, in proportion to your holding. The parent receives no cash from a spin-off, which is the single feature that most cleanly separates it from a divestiture (an outright sale). Comcast's spin-off of Versant Media Group, completed effective January 2, 2026, is a recent example: Comcast holders received one Versant share for every 25 Comcast shares they owned.

What does divesting mean?

Divesting (or divestment) is the umbrella term for a company shedding a business unit by any method — it is the parent category, not a specific structure. A company can divest by selling the unit for cash (a divestiture), by distributing it to shareholders as a new public company (a spin-off), by offering shareholders an exchange of parent shares for subsidiary shares (a split-off), or by selling a minority stake through an IPO (an equity carve-out). So every spin-off is a form of divesting, but not every divestiture is a spin-off. When you read that a company is 'divesting' a division, that word alone does not tell you whether cash comes in or shareholders receive stock — you have to look at which structure was used.

What is the difference between a spin-off and a divestiture?

The core difference is cash and who ends up owning the business. A divestiture is an outright sale of a business unit for cash to a strategic or private-equity buyer — the parent gets money, and the buyer gets the business. A spin-off transfers no cash: the parent distributes the subsidiary's shares to its own existing shareholders, who end up owning a new standalone public company alongside their original shares. In a divestiture the unit leaves the shareholder base entirely; in a spin-off the same shareholders keep exposure to both companies. 'Divestiture' is sometimes used loosely to mean any separation, but in precise usage it means a sale — the cash-in, business-out transaction.

Are spin-offs taxable?

A spin-off can be tax-free to both the parent and its shareholders if it satisfies Internal Revenue Code Section 355. The core requirements: the parent must distribute stock representing control — at least 80% of voting power and 80% of each non-voting class of the subsidiary; both the parent and the spun-off company must have been engaged in an active trade or business conducted throughout the five-year period before the distribution; the transaction must not be principally a 'device' to distribute earnings and profits; and it must have a genuine corporate business purpose. Miss these and the distribution can be taxed as a dividend at the shareholder level or trigger corporate-level gain. Most large public spin-offs are structured specifically to qualify under §355.

What is a Reverse Morris Trust?

A Reverse Morris Trust (RMT) is a way for a parent to combine a business with a specific merger partner without triggering corporate tax. The parent first spins off the business to its own shareholders tax-free under Section 355, and the spun-off entity immediately merges with the target company. The catch is the load-bearing rule: the original parent's shareholders must end up owning more than 50% of the combined company. If they own 50% or less, Section 355(e) — the 'anti-Morris Trust' rule — treats the spin-off as a taxable event at the corporate level. The RMT structure lets a company effectively hand a division to a merger partner while preserving the tax-free character of the spin.

What is the difference between a spin-off and a carve-out?

A spin-off distributes 100% of a subsidiary's shares to existing shareholders for no cash, creating a fully independent company. An equity carve-out sells only a minority stake in the subsidiary through an IPO — cash does come in to the parent, and the parent usually retains control (often keeping 80%+ of the shares). A carve-out is frequently the first step of a longer separation: the parent floats a slice to establish a market price and raise cash, then later completes the separation with a spin-off or split-off. So the two are not opposites but often sequential — carve-out first for cash and price discovery, full spin-off or split-off later to finish the job.

What is a split-off?

A split-off is a separation in which the parent offers its shareholders the chance to exchange their parent shares for subsidiary shares — an exchange offer, rather than an automatic pro-rata distribution. It is elective: shareholders choose whether to swap, and those who do give up parent stock to receive the subsidiary's stock. Because parent shares are tendered and retired in the exchange, a split-off reduces the parent's outstanding share count, which a plain spin-off does not. Johnson & Johnson used a split-off to complete its separation of Kenvue in 2023, offering holders Kenvue shares in exchange for J&J shares at a 7% discount. Split-offs are often paired with a preceding carve-out IPO.

What are recent examples of spin-offs?

Several large-cap breakups illustrate the mechanics. General Electric split into three: GE HealthCare separated January 3, 2023, and GE Vernova and GE Aerospace began regular-way trading April 2, 2024 (one Vernova share per four GE shares). 3M spun off its healthcare business as Solventum on April 1, 2024 (SOLV, one Solventum share per four 3M shares, with 3M retaining 19.9%). GSK completed the demerger of Haleon on July 18, 2022 (one Haleon share per GSK share, London-listed). Comcast completed its spin-off of Versant Media Group effective January 2, 2026 (VSNT on Nasdaq from January 5, 2026, one Versant share per 25 Comcast shares).

Why do companies spin off divisions?

Companies spin off divisions to let each business be valued and managed on its own terms. A conglomerate discount — where the market values a diversified group at less than the sum of its parts — often reverses when units trade separately, so pure-play focus and clearer valuation are common motives. Management bandwidth is another: a slower, cash-generative business and a fast-growing one need different capital allocation, incentives, and investor bases. Spin-offs can also respond to activist-investor pressure, sharpen strategic focus, or resolve regulatory and portfolio-fit questions. The wave of large-cap separations from 2023 to 2026 — GE, Johnson & Johnson, 3M, Honeywell, Comcast — reflects boards deciding that focused companies attract clearer valuations than sprawling ones.

Is a spin-off the same as a demerger?

Yes — 'demerger' is the term used in the UK, Europe, and much of the Commonwealth for what US practice calls a spin-off. The mechanics are the same: a parent separates a business and distributes it to existing shareholders as an independent listed company, with no cash paid to the parent. GSK's separation of its consumer-health business Haleon in July 2022 was structured as a demerger and admitted to the London Stock Exchange, with shareholders receiving one Haleon share for each GSK share held. If you see 'demerger' in a European filing or 'spin-off' in a US one, they describe the same basic transaction.

Do you need a data room for a spin-off?

In practice, yes — a separation runs on organized document workspaces. The deal side holds the information-statement backup, carve-out financials, and the tax analysis supporting Section 355 treatment. The operational side manages what actually moves: the perimeter file list, TSA schedules, contract consents, and Day-1 runbooks that the parent, the SpinCo, and their advisors all need to see under different permissions. Granular access control is the whole game, because bankers, auditors, and two management teams each get a different slice. Peony is built for that multi-party pattern — unlimited rooms at $52 per admin per month, visitor groups per workstream, and full audit trails — which is how separation teams keep a two-year project inspectable.

Related resources

• Corporate Divestiture Data Room — the operational guide to running a divestiture or carve-out room: the perimeter problem, the entanglement map, stranded costs, carve-out financials, and TSA schedules.
• Carve-Out Data Room — the carve-out case specifically, from defining what travels with the unit to walling the retained parent off from bidders.
• Types of Mergers and Acquisitions — the wider M&A taxonomy that spin-offs, split-offs, and divestitures sit inside.
• What Is a Hostile Takeover? — the sibling glossary on tender offers, proxy fights, and takeover defenses.
• What Is a Reverse Merger? — the sibling glossary on the back-door route to going public, and how it differs from a de-SPAC.