What Is an F Reorganization? Requirements, Steps, and S Corp Uses

An F reorganization is a tax-free corporate restructuring under Section 368(a)(1)(F) of the Internal Revenue Code that lets a corporation change its legal identity, its form, or its state of incorporation without any tax consequence to the company or its shareholders. The statute calls it “a mere change in identity, form, or place of organization of one corporation, however effected.”¹ What sets it apart from the other six reorganization types in Section 368 is that the IRS treats the resulting corporation as the same taxpayer that existed before the transaction. Tax attributes carry over intact. The tax year stays open.

What “Mere Change” Actually Means

The language is deceptively simple. In practice, the legal wrapper changes while everything underneath stays the same: the same shareholders own the same proportional interests, the same assets sit inside the entity, and the same business keeps running. The typical fact patterns are a name change, reincorporation from one state to another, or a conversion from one corporate form to another where the entity remains taxed as a corporation.

Two doctrines that police most tax-free reorganizations are waived here. Treasury regulations explicitly do not require continuity of interest or continuity of business enterprise for F reorganizations occurring on or after February 25, 2005.² Those tests exist to catch disguised sales. They’re unnecessary when, by definition, nothing of economic substance has changed.

The Six Requirements to Qualify

Treasury Regulation 1.368-2(m) lists six conditions. Miss any one and the transaction doesn’t qualify.

All stock in the resulting corporation must be issued in exchange for stock in the old corporation. A trivial amount of stock issued solely to form the new entity and keep it legally alive is disregarded.
The same people must own stock in the resulting corporation, in the same proportions, as they did in the old corporation immediately before the transaction. Shareholders can swap into stock with different terms (voting for nonvoting of equivalent value, for instance) or receive distributions of cash or property without breaking this rule.
The resulting corporation must be a clean shell. It cannot hold property or carry tax attributes before the reorganization, other than a trivial amount of assets needed to incorporate or borrowings taken to fund the reorganization itself.
The old corporation must completely liquidate for federal tax purposes. It doesn’t have to dissolve under state law and can keep minimal assets to preserve its legal existence.
Only the resulting corporation can end up holding the old corporation’s property and inheriting its tax attributes.
The resulting corporation can inherit assets and tax attributes from one predecessor only. It cannot simultaneously absorb another corporation’s history.³

The final two requirements enforce a single-operating-entity principle. Revenue Ruling 2008-18 states that an F reorganization “involves a single operating entity.”⁴ A shell or holding company without real operations can participate alongside the operating entity. Two genuine businesses cannot combine and call the result an F reorganization.

How the Transaction Gets Done

Meeting the tax requirements is only half the work. The restructuring also has to be executed under the relevant state’s business laws. Three methods are common.

Statutory Merger

The old corporation merges into a newly formed corporation, typically incorporated in the desired new jurisdiction. Assets and liabilities pass by operation of law when the articles of merger are filed, which avoids individually transferring deeds, contracts, or other property. This has long been the most common approach.

Domestication or Conversion

Many states now allow a corporation to change its jurisdiction or legal form through a domestication statute, skipping the merger step. The corporation files paperwork switching its state of incorporation, and the state treats it as the same entity continuing under new law. When available, this is often the cleanest route because no second entity exists and no merger formalities apply.

A statutory conversion works the same way but changes the entity’s legal form rather than its jurisdiction. A corporation converting to an LLC that elects corporate taxation can qualify, because the entity remains taxed as a corporation throughout.

Holding Company Formation

An F reorganization can also insert a new holding company above an existing operating business. The mechanics: form a new corporation and a short-lived subsidiary, merge the subsidiary into the operating company, and issue holding-company stock to the shareholders in exchange for their operating-company stock. The IRS disregards the transitory subsidiary and treats the sequence as a restructuring of the corporate chain. This technique appears constantly in acquisition planning, especially with S corporations.

What Survives the Transaction

The payoff for meeting all six conditions is that the resulting corporation inherits every tax attribute the old corporation had. Section 381 governs the carryover and treats F reorganizations more favorably than any other type.⁵

The Tax Year Stays Open

In every other Section 381 reorganization, the transferor’s tax year ends on the date of the transfer. The F reorganization is the sole exception. Section 381(b) begins “Except in the case of an acquisition in connection with a reorganization described in subparagraph (F),” then lists the rules that close the year and block net operating loss carrybacks.⁵ The resulting corporation files a single, uninterrupted return for the full year. No short-period returns. No mid-year cutoffs.

Net Operating Losses Come Through Uncapped

For corporations carrying forward losses, the F reorganization avoids a trap that catches almost every other restructuring. Section 382 normally imposes a strict annual cap on the use of pre-change net operating losses after an ownership change. The statute explicitly excludes F reorganizations from the definition of “equity structure shift,” so the transaction cannot trigger an ownership change under Section 382.⁶ Inherited losses come through without any annual limitation. This is often the single biggest reason to structure a deal as an F reorganization.

Everything Else

Accumulated earnings and profits carry over. The current year’s E&P isn’t artificially split between two periods, so subsequent distributions are characterized against the full history. Asset basis carries over, preserving depreciation schedules and any built-in gains or losses. Shareholders keep the same stock basis. Accounting methods and prior tax elections continue without needing IRS permission to change. The corporation usually keeps the same Employer Identification Number, because the IRS views the resulting entity as the same taxpayer.⁴

The S Corporation Use Case

The F reorganization has become a standard tool in private equity acquisitions of S corporations, and this is probably where most practitioners see it today. It solves a problem other structures handle poorly: giving a buyer a step-up in asset basis while letting sellers defer tax on any equity they roll over.

The typical sequence: the S corporation’s shareholders form a new corporation (“Newco”) and elect S status for it. They contribute their old stock to Newco, and the old corporation (“Oldco”) simultaneously makes a Qualified Subchapter S Subsidiary election on Form 8869. That QSub election turns Oldco into a disregarded entity for federal tax purposes, with its assets and liabilities treated as owned directly by Newco. The overall transaction qualifies as an F reorganization because the same shareholders own the same business in the same proportions; only the corporate wrapper changed.

Once the structure is in place, the buyer purchases the QSub’s stock from Newco. That stock purchase is treated as an asset sale for tax purposes, giving the buyer a stepped-up basis in the target’s assets without a Section 338(h)(10) election and its 80% purchase threshold. Sellers rolling over equity into the buyer’s structure defer gain on the rollover portion. The S election carries over to Newco automatically; no new Form 2553 is required.⁴

One wrinkle: when the F reorganization creates a QSub, the QSub may need its own EIN for employment tax and information reporting, even though Newco continues using the original EIN for income tax. Revenue Ruling 2008-18 changed earlier guidance on this point because of how QSubs interact with the tax system.

Filing and Documentation

Every corporation that takes part in the reorganization must attach a statement to its federal income tax return for the year of the transaction. Treasury Regulation 1.368-3 prescribes the format. The statement must be titled using specific language identifying the taxpayer by name and EIN, and it must include the names and EINs of all parties, the date of the reorganization, and the value and basis of the assets or stock transferred.⁷ The statement goes with Form 1120 and effectively tells the IRS the corporation is claiming nonrecognition under Section 368.

Because the old corporation technically liquidates for federal tax purposes, it may also need to file Form 966 (Corporate Dissolution or Liquidation). Regulations require the form within 30 days after adopting a plan of liquidation, even when no actual winding-down is happening.⁸ Missing the 30-day window doesn’t invalidate the reorganization, but the IRS does expect it.

Watch the Step Transaction Doctrine

Because F reorganizations often happen as one step in a larger deal, timing matters. Under the step transaction doctrine, the IRS can collapse a series of formally separate steps into a single transaction. If the reorganization is part of a prearranged plan that, viewed as a whole, looks like something other than a mere change in form, the IRS can recharacterize the sequence.

The risk is highest in acquisitions. The holding-company F reorganization followed days later by a stock sale to a private equity buyer works precisely because the IRS blessed that sequence in Revenue Ruling 2008-18. Stretching the reorganization across multiple tax years, inserting unrelated transactions between the steps, or structuring the reorganization so different shareholders end up with different economic outcomes gives the IRS grounds to collapse the steps and deny F treatment. Complete the steps quickly and make each one genuinely interdependent with the others.

Cross-Border Limits

An F reorganization doesn’t stay tax-free at an international border. If a domestic corporation reincorporates abroad (an outbound F reorganization), Section 367(a) overrides the nonrecognition rules and generally requires the corporation to recognize gain on all appreciated property transferred to the foreign entity.⁹ Unless the transaction meets narrow exceptions involving control by five or fewer domestic corporations and specific basis adjustments, the full gain on every appreciated asset becomes immediately taxable.

Moving inbound, a foreign corporation redomiciling into the United States has historically triggered FIRPTA complications, which tax foreign persons on gains from U.S. real property interests. Even when ownership and business stayed identical, foreign shareholders could face unexpected gain recognition. In August 2025, the IRS released Notice 2025-45, signaling its intent to propose regulations relieving this FIRPTA burden for publicly traded foreign corporations that redomicile into the U.S. through an F reorganization, if the foreign corporation’s stock was regularly traded for the three years before the transaction and the domestic resulting corporation remains publicly traded for at least one year afterward.¹⁰ Those regulations are not yet final.

1
Office of the Law Revision Counsel. 26 U.S. Code 368 – Definitions Relating to Corporate Reorganizations
2
eCFR. 26 CFR 1.368-1 – Purpose and Scope of Exception of Reorganization Exchanges
3
eCFR. 26 CFR 1.368-2 – Definition of Terms
4
Internal Revenue Service. Revenue Ruling 2008-18
5
Office of the Law Revision Counsel. 26 U.S. Code 381 – Carryovers in Certain Corporate Acquisitions
6
Office of the Law Revision Counsel. 26 U.S. Code 382 – Limitation on Net Operating Loss Carryforwards and Certain Built-in Losses Following Ownership Change
7
eCFR. 26 CFR 1.368-3 – Records to Be Kept and Information to Be Filed with Returns
8
eCFR. 26 CFR 1.6043-1 – Return Regarding Corporate Dissolution or Liquidation
9
Internal Revenue Service. Outbound Transfers of Property to Foreign Corporation – IRS Practice Unit
10
Internal Revenue Service. Notice 2025-45 – Application of Sections 897(d) and (e) to Certain Inbound Asset Reorganizations