A corporate spinoff separates a division or subsidiary from its parent company into a standalone, publicly traded entity by distributing shares of the new company to the parent’s existing shareholders. If you own the parent stock on the record date, the new company’s shares land in your brokerage account on the distribution date, in proportion to what you already hold. When the transaction meets the requirements of Internal Revenue Code Section 355, neither you nor the parent company owes tax on the distribution itself, though your cost basis in the original shares has to be split between the two positions going forward.
How the Share Distribution Works
The parent’s board declares the spinoff and sets a distribution ratio that reflects the relative size of the subsidiary being separated. A one-for-ten ratio means 100 shares of the parent gets you 10 shares of the new company. The distribution is pro-rata, so every parent shareholder receives new shares in the same proportion.
Spinoffs do not require a shareholder vote. The distribution functions like a dividend rather than a merger or sale, so the board declares it, sets the terms, and executes it. After separation, the new company operates with its own board, executive team, and reporting obligations. The former parent has no authority over its decisions.
For the transaction to qualify as tax-free, the parent has to distribute either all of the subsidiary’s stock or at least an amount representing 80 percent of the voting power and 80 percent of every other class of stock. Retaining any shares beyond that 20-percent ceiling puts the tax-free status at risk. Many parents distribute 100 percent to sidestep the issue; some retain a small stake and must satisfy the IRS that the retention has a legitimate non-tax purpose.
What Makes a Spinoff Tax-Free
Section 355 of the Internal Revenue Code is the provision that makes both the distribution and the shareholder receipt tax-free. Without it, distributing subsidiary stock would be treated as a taxable dividend. Qualifying is the central objective of virtually every major spinoff, and the requirements are strict enough that companies spend months structuring the transaction to comply.
Active Trade or Business for Five Years
Both the parent and the new company must be engaged in an active trade or business immediately after the distribution, and each business must have been actively conducted for the entire five-year period ending on the distribution date. Neither business can have been acquired in a taxable transaction during that window. The rule blocks a company from buying a business specifically to spin it off and extract tax-free value.
Not a Device for Distributing Earnings
The transaction cannot function primarily as a mechanism to distribute corporate earnings and profits at capital gains rates instead of dividend rates. The IRS looks at whether shareholders of either company are likely to sell their stock shortly after the distribution, which can signal a disguised cash-out. A pre-arranged post-spinoff sale is strong evidence of a device; sales that happen independently after the fact do not automatically disqualify the transaction.
A Real Business Purpose
The distribution must be motivated by a substantial business purpose other than reducing federal taxes. Qualifying purposes commonly include allowing each business to be valued independently, resolving management conflicts between divisions with different strategic needs, or facilitating a transaction that requires the businesses to be separate. The IRS weighs the strength of the stated purpose against any tax-avoidance benefit.
The 80-Percent Distribution Threshold
The parent must distribute stock representing at least 80 percent of the subsidiary’s total voting power and 80 percent of each other class of stock. The threshold comes from the definition of control under Section 368(c). Any stock the parent keeps must not be retained as part of a plan to avoid federal income tax, and the parent bears the burden of proving that.
The Dates That Determine Who Gets Shares
Two dates control the mechanics. The record date determines which shareholders are entitled to receive shares of the new company. If you own parent stock at the close of business on the record date, you receive the distribution. The distribution date is when the shares actually appear in your brokerage account, delivered electronically through the Depository Trust Company. No action is required from you.
Between those two dates, a when-issued trading market typically opens on the stock exchange. Investors can buy and sell the right to receive the new company’s shares before they are physically delivered. The window helps establish a preliminary market price for the spinoff before it begins trading on its own.
If you sell parent shares after the record date but before the distribution date, the trade settles with a “due bill” attached. The due bill obligates the seller to deliver the pending distribution to the buyer, because the buyer purchased shares that were still entitled to it at the time of the trade. DTC tracks these interim settlements automatically so the correct party ends up with the shares on the payable date.
What Happens to Your Cost Basis and Holding Period
On the first trading day after the distribution, the parent’s stock price drops by roughly the value of the business that was separated. This is not a loss. Your total portfolio value stays approximately the same because the decline in parent shares is offset by the value of the new shares you received. The market is simply re-pricing the parent to reflect its smaller asset base.
The consequential adjustment happens with your cost basis. Under Section 358 of the Internal Revenue Code, your original cost basis in the parent shares must be allocated between the parent stock you still hold and the new spinoff shares you received, based on the relative fair market values of the two stocks on the distribution date. If the parent represents 75 percent of the combined value and the spinoff represents 25 percent, then 75 percent of your original basis stays with the parent and 25 percent shifts to the new shares.
Getting this right matters for every future sale. An incorrect basis means you will overstate or understate your capital gain. The new company typically publishes a Form 8937 (Report of Organizational Actions Affecting Basis of Securities) or a similar allocation worksheet, and most brokerages adjust basis automatically. Verify your brokerage records against the published allocation anyway, especially if you bought parent shares in multiple lots at different prices.
Your Holding Period Carries Over
Section 1223 of the Internal Revenue Code treats a Section 355 distribution as an exchange for holding-period purposes. Your spinoff shares inherit the holding period of the parent shares they came from. If you held the parent stock for three years before the spinoff, your new shares are also treated as held for three years on the day you receive them. That determines whether a future sale qualifies for long-term capital gains rates, which require holding for more than one year.
Fractional Shares Turn Into Cash
When the distribution ratio does not produce whole numbers, you end up with a fractional share entitlement. Most companies sell those fractions on the open market and send you a cash payment for the proceeds. These cash-in-lieu payments are taxable, typically as a capital gain or loss calculated using the allocated basis for the fractional portion. Watch your year-end tax forms for these entries, because brokerages do not always report them correctly.
If You Hold Employee Stock Options
Employees holding options in the parent face a mechanical adjustment. The goal is to preserve the total economic value of your options despite the parent’s stock price dropping. Companies calculate an adjustment ratio by dividing the parent’s closing price on the last trading day before the spinoff by its opening price on the first trading day after. Both the number of option shares and the exercise price are then recalculated using that ratio: the share count is multiplied by the ratio (increasing quantity) and the exercise price is divided by it (lowering the strike). Fractional shares from the adjustment are dropped, and the adjusted exercise price is carried to four decimal places.
The specific formula varies by company and plan terms. Some spinoffs convert parent options into two separate grants covering both the parent and the spinoff stock. The plan administrator publishes the adjustment details, and the calculations are documented in SEC filings. Compare the published ratio against what your records show; do not assume the adjustment flows through your plan account perfectly.
Regulatory Filings Behind the Scenes
The new company must register its stock with the Securities and Exchange Commission by filing Form 10, the general registration form for securities under the Securities Exchange Act of 1934. Form 10 requires detailed disclosure of business operations, risk factors, executive compensation, and audited financial statements. Foreign companies listing on U.S. exchanges file Form 20-F instead, which serves the same function for foreign private issuers.
Most companies also seek a Private Letter Ruling from the IRS confirming that the transaction qualifies under Section 355. The IRS continues to issue these rulings and published updated procedures in Revenue Procedure 2025-30 governing submissions made after September 2025. Alternatively, companies can rely on a formal tax opinion from outside counsel rather than waiting on an IRS ruling, which can take months.
Once the SEC declares the registration effective, the parent sends an information statement to all shareholders of record. It explains the transaction terms, the new company’s financial condition, risk factors, and the mechanics of the distribution. Because spinoffs do not require a shareholder vote, the information statement substitutes for a proxy statement.
The Hart-Scott-Rodino Act requires premerger notification filings with the Federal Trade Commission for certain transactions above specified dollar thresholds. For 2026, the adjusted size-of-transaction threshold is $133.9 million, and transactions valued above $535.5 million require an HSR filing regardless of the parties’ size. Pro-rata distributions to existing shareholders of a single corporate family often qualify for an exemption, but spinoffs paired with third-party transactions, or where the separated entity immediately merges with another company, may trigger the filing requirement.
Liability Allocation and Creditor Risk
How debt and liabilities get divided between the parent and the new company is one of the most contentious aspects of any spinoff. The separation agreement specifies which entity assumes each obligation, covering long-term debt, pension liabilities, pending litigation, and environmental cleanup costs. This is where spinoffs can go badly wrong for creditors and for the new company’s shareholders.
Fraudulent conveyance laws are the primary check on abusive liability dumping. If a parent loads the spinoff with disproportionate debt or strips it of assets before separation, creditors can challenge the transaction. To defend against those claims, companies obtain solvency opinions from independent financial advisors confirming that the new entity’s assets exceed its liabilities at the time of separation. Courts have held that as long as the spinoff was solvent when separated, the capital structure is generally defensible, even if aggressive.
The consequences of getting this wrong are severe. In one prominent case, a spun-off chemical company filed for bankruptcy and sued its former parent, alleging inadequate capitalization; a court found the parent acted with intent to hinder creditors, and the settlement reached $5.15 billion. In another matter, the parent contributed an additional $250 million to the separated entity and took a 30-percent equity stake as part of the bankruptcy resolution.
Existing bond covenants add another layer. Many corporate bonds restrict asset sales, stock transfers of subsidiaries, and transactions with affiliates. A spinoff can trigger these provisions, potentially requiring bondholder consent, accelerating debt repayment, or forcing redemption at par or a premium. Every outstanding debt instrument has to be reviewed before the separation is structured.
Spinoff Versus Equity Carve-Out
A spinoff distributes shares to existing shareholders and generates no cash for either company. An equity carve-out sells shares to new investors through an IPO, raising capital for the parent, the new entity, or both. The regulatory paths diverge accordingly. A carve-out requires a full IPO prospectus with audited carve-out financial statements and underwriter involvement; a spinoff relies on Form 10 registration and an information statement. Carve-outs tend to close faster, averaging around eight months from announcement to listing. Spinoffs generally take longer, often more than a year, because of the additional tax structuring required under Section 355 and the complexity of separating shared operations.
Some transactions combine both approaches. A parent might first sell a minority stake through a carve-out IPO, then distribute its remaining shares in a tax-free spinoff. The hybrid lets the parent raise cash while eventually achieving full separation. The choice between structures depends on whether the parent needs capital, how quickly the market can absorb a new public company, and whether the transaction can satisfy Section 355.