TL;DR. A spinoff is when a parent company hands shareholders new stock in one of its subsidiaries, turning a single company into two independent public companies. If the deal meets the four tests in Internal Revenue Code Section 355 — control, active business, non-device, and a real business purpose — the shares land in your brokerage account without a tax bill. FedEx’s June 2026 separation of FedEx Freight is a textbook example.
What a spinoff actually is
In a spinoff, the parent (often called RemainCo) distributes shares of a wholly owned subsidiary (SpinCo) directly to existing shareholders on a pro-rata basis. If you owned 1,000 shares of the parent on the record date and the distribution ratio is 1-for-2, you wake up the morning of the distribution with 1,000 shares of RemainCo and 500 shares of SpinCo. No cash changes hands.
That distinguishes a spinoff from three close cousins:
- Equity carve-out (partial IPO): the parent sells a slice of the subsidiary’s stock to the public for cash and keeps majority control. T-Mobile’s 2007 IPO from Deutsche Telekom is the classic shape.
- Split-off: the parent offers existing shareholders the chance to exchange parent shares for subsidiary shares. It’s effectively a tender offer in stock.
- Sale or divestiture: the parent sells the unit to a strategic buyer or financial sponsor for cash. Yum Brands’ $2.7 billion Pizza Hut sale to LongRange Capital is one of those.
A clean spinoff is the only one of the four that gives existing holders ownership of the new entity without triggering a tax event or requiring them to part with capital. That tax efficiency is the heart of why boards reach for the spinoff structure.
Section 355: the four tests that buy you tax-free status
The default rule under U.S. corporate tax law is that any non-cash distribution to shareholders is taxed as a dividend. Section 355 is the exception that lets the parent push out subsidiary stock without triggering corporate-level gain or shareholder-level income — but only if every box is checked.
1. Control (the 80% test)
Before the distribution, the parent must own stock representing at least 80% of the total voting power of the subsidiary and 80% of every non-voting class. In the distribution, the parent must hand out either all of that stock or enough to constitute control, with the rest kept only if the IRS is satisfied the retention isn’t for tax avoidance (26 U.S.C. § 355(a)(1)(D)). This is why you frequently see a distribution percentage of 80.1% — it’s the minimum that satisfies the test while letting the parent retain a stub it can dispose of later for debt paydown.
2. Active trade or business (the 5-year test)
Both RemainCo and SpinCo must be engaged in an “active trade or business” that has been conducted for at least five years before the distribution, and that business cannot have been acquired in a taxable transaction during that window (26 U.S.C. § 355(b)). Holding-company-style structures with no real operations fail this. So do recently bought, lightly integrated businesses that someone is trying to flip back out tax-free.
3. Non-device requirement
The spinoff cannot be used “principally as a device for the distribution of the earnings and profits” — IRS-speak for dressing up a taxable dividend as a tax-free reorganization. Pre-arranged sales of either parent or SpinCo shares around the distribution date are a red flag. Importantly, this is a facts-and-circumstances test; subsequent unplanned sales by shareholders don’t automatically poison the deal.
4. Business purpose
The transaction needs a real corporate-level reason — operational focus, regulatory cleanup, capital-structure flexibility, freeing both pieces to pursue different M&A — that goes beyond “return cash to shareholders.” Boards typically spell this out in the spinoff prospectus (the Form 10 filing on EDGAR), and the IRS will issue a private letter ruling confirming the structure works.
| Section 355 test | What it requires | Common failure mode |
|---|---|---|
| Control | Parent owns ≥ 80% voting + 80% of each non-voting class before, and distributes that control | Retaining a stake too large to qualify; selling pre-distribution shares to third parties |
| Active trade or business | Both RemainCo and SpinCo run an operating business that has existed for 5+ years | Recently acquired unit; pure holding company with no real operations |
| Non-device | Distribution not used principally to deliver earnings to shareholders tax-free | Pre-arranged sales of SpinCo or RemainCo around the distribution |
| Business purpose | Real corporate reason: focus, capital structure, M&A optionality, regulatory | Documented purpose reads as “return capital” rather than operational |
The mechanics: from announcement to first trade
A typical U.S. spinoff runs on a 6–18 month timetable. Here are the dates that matter:
- Board announcement. The parent files an 8-K describing the intended separation, the rationale, and the target completion window. The stock typically reacts on the day of announcement; that reaction is what older event studies measure.
- Form 10 filing. SpinCo files a Form 10 with the SEC — the spinoff equivalent of an S-1. It is your most detailed source on what SpinCo actually owns, what its standalone financials look like, and what risks the parent is offloading.
- Private letter ruling and tax opinion. The parent obtains an IRS ruling or a tax opinion confirming Section 355 treatment.
- Record date. The date by which you must own the parent’s stock to receive SpinCo shares. For FedEx Freight, this was the close on May 15, 2026.
- Distribution date. SpinCo shares are credited to brokerage accounts and begin regular-way trading. FedEx Freight (NYSE: FDXF) started trading June 1, 2026.
- When-issued trading. In the 1–3 weeks before distribution, brokers often quote both RemainCo “ex-distribution” and SpinCo “when-issued” markets. These let you trade either piece before the official split.
Worked example: FedEx Freight (FDXF)
On June 1, 2026, FedEx (NYSE: FDX) completed the spinoff of FedEx Freight Holding Company, its North American less-than-truckload (LTL) business, under the ticker FDXF. The mechanics:
- Distribution ratio: one share of FDXF for every two shares of FDX held at the close on the record date (May 15, 2026).
- Pro-rata distribution percentage: 80.1% of FDXF shares distributed to FDX holders.
- Retained stake: FedEx kept 19.9% of FDXF, with the stated intention of using that stub for debt-for-equity exchanges within roughly 24 months. That post-distribution disposal of the retained piece is itself structured to remain tax-efficient under Section 361.
- Tax treatment for shareholders: the FDXF distribution is expected to be tax-free to U.S. holders, with the only taxable element being cash paid in lieu of fractional shares.
If you owned 200 shares of FDX before the record date, your post-distribution position is 200 shares of FDX plus 100 shares of FDXF — and your cost basis in the original 200 FDX shares gets allocated between the two, based on the relative fair market values of FDX and FDXF on the distribution date. The IRS requires the parent to publish that allocation, typically in an IRS Form 8937 posted to investor relations.
Why spinoffs have an academic reputation for outperforming
The headline result that fuels the “spinoffs beat the market” thesis comes from Cusatis, Miles, and Woolridge (1993), published in the Journal of Financial Economics. The authors looked at 146 pure, non-taxable spinoffs over 1965–1988 and measured returns out to 36 months. Spinoff shares delivered 52.0% mean raw returns over 24 months and 76.0% over 36 months; adjusted for matched control firms (same size, same industry), the abnormal returns were 25.0% over 24 months and 33.6% over 36 months, both statistically significant at the 5% level. Parent companies that completed spinoffs also outperformed, with 24-month and 36-month matched-firm-adjusted abnormal returns of about 21.8% and 9.9% for the broader sample.
An important nuance buried in the paper: the outperformance is concentrated in spinoffs and parents that were eventually taken over. Of the 146 spinoffs, 21 became targets within three years, and those alone delivered 99.3% matched-firm-adjusted returns over 36 months. Strip out the takeovers, and the remaining sample’s abnormal performance is much smaller and not statistically significant. In other words, the spinoff “edge” is not magic — it is the option value created when a focused, cleanly capitalized business becomes attractive to a strategic acquirer.
More recent work has been mixed. McConnell, Sibley, and Xu (Journal of Portfolio Management, 2015) extended the sample through 2007 and found the spinoff abnormal return shrank materially once you control for size, value, and momentum factors. The implication is that a naive “buy every spinoff” strategy is no longer a free lunch — you have to be selective about which spinoffs you buy. The takeover-target lens that Cusatis identified is still a useful filter.
How a spinoff can “bust” — and why it matters to you
Failing any of the Section 355 tests turns the distribution into a taxable event, and the bill can be large because it operates at two levels: the parent is treated as having sold the subsidiary at fair market value (a corporate-level tax), and shareholders are treated as having received a dividend equal to the value of the SpinCo shares (an individual-level tax).
Two common reasons spinoffs run into trouble:
- The “Morris Trust” trap. If, within two years of the spinoff, more than 50% of either RemainCo or SpinCo is acquired in a related-party transaction, the IRS will treat the deal as a disguised sale and tax it under Section 355(e). Boards build merger lock-ups into the separation agreement to manage this; that is why deals like the Dana / Eaton “Reverse Morris Trust” arrangement are structured the way they are.
- Active-business shortfalls. If SpinCo’s operating business is too thin or too newly acquired, the IRS can refuse the private letter ruling. The parent then either restructures (often by injecting more operating assets into SpinCo before the distribution) or abandons the tax-free structure.
As a shareholder, the practical risk is contingent: you generally do not owe tax up front, but if a spinoff later busts because of post-distribution M&A, the IRS can clawback tax through the parent’s indemnification. That is why bust risk shows up as a tail risk in RemainCo, not the SpinCo shares already in your account.
What to learn next
- Form 10 reading. SpinCo’s Form 10 is the single most useful document for understanding standalone economics — capital structure, customer concentration, parent-cost allocations, and how synergies were carved out.
- Reverse Morris Trust deals. A spinoff plus an immediate merger of SpinCo with a third party, structured to keep the package tax-free. Mechanically tricky and a regular source of M&A activity in industrials.
- Tracking stocks. A cousin structure where the parent issues a separate class of common stock that “tracks” a subsidiary’s performance without distributing the subsidiary itself.
- SpinCo index investing. Funds and indices that systematically own recent spinoffs (the original Beacon Spin-Off Index, now the S&P U.S. Spin-Off Index, and the Invesco S&P Spin-Off ETF, CSD) try to capture the historical pattern that Cusatis described.
Sources
- 26 U.S.C. § 355 — Distribution of stock and securities of a controlled corporation (Cornell Legal Information Institute).
- Cusatis, Miles & Woolridge, “Restructuring through spinoffs: The stock market evidence,” Journal of Financial Economics 33 (1993): 293–311.
- FedEx Investor Relations: Board approves spin-off of FedEx Freight (2026).
- FedEx Freight Holding Company, Form 10-12B/A, SEC EDGAR.
- IRS Form 8937, Report of Organizational Actions Affecting Basis of Securities.
Disclosure: This article was produced with AI assistance and reviewed before publication. It is for informational purposes only and is not investment advice.