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An affiliated group is a set of corporations connected through common ownership that are eligible to file a single consolidated federal income tax return with the U.S. Internal Revenue Service. The consolidated return treats the entire group as one taxpayer, allowing profitable entities in the group to offset losses in other entities, and eliminating intercompany transactions from taxable income until those transactions involve an outside party. The legal framework for affiliated groups is defined in Section 1504(a) of the Internal Revenue Code.
To qualify as part of an affiliated group, a corporation must meet a two-part stock ownership test. The common parent of the group must directly own stock representing at least 80% of the total voting power and 80% of the total value of at least one other includible corporation in the chain. Each subsidiary in the chain must then have at least 80% of its voting power and value held directly by one or more other corporations in the same affiliated group.
Ownership through a partnership does not count for affiliation purposes, even if the parent effectively controls 100% of the downstream corporation through the partnership. The connection must run directly through stock ownership between corporations.
The Internal Revenue Code defines an "includible corporation" as any corporation other than those specifically excluded. Excluded entities include tax-exempt organizations under Section 501, life insurance companies taxed under Section 801, foreign corporations, regulated investment companies, real estate investment trusts, domestic international sales corporations, and S corporations. A partnership cannot be included in a consolidated return even if it is 100% owned by group members, because it is not a corporation.
Foreign subsidiaries are generally excluded even when 80% owned by the U.S. parent. Exceptions exist for certain Canadian and Mexican entities and certain foreign corporations that are treated as domestic for purposes of anti-inversion rules.
When an affiliated group elects to file a consolidated return, the parent corporation files a single Form 1120 on behalf of all members. Each subsidiary signs a Form 1122 to authorize its inclusion for the first year it joins the group. The consolidated taxable income is calculated by combining the income and losses of all members, eliminating intercompany transactions, and applying tax rules as if the group were a single entity.
The primary tax benefit is loss absorption. If one subsidiary generates a net operating loss while another generates significant income, the consolidated return allows the profitable subsidiary's income to be offset by the loss, reducing the group's overall tax liability. Filing separate returns would leave the loss trapped in the subsidiary until it can be used against that entity's own future income.
When a corporation sells goods or services to another member of the same affiliated group, that transaction is ignored for tax purposes at the consolidated level. Recognizing income on an intercompany sale would allow the group to create artificial profits or losses by transacting with itself. The gain or loss on an intercompany transaction is deferred until the property or service leaves the group through a transaction with an unrelated outside party.
This deferral rule is one of the more complex aspects of consolidated return compliance and requires careful tracking of basis, timing, and character of deferred amounts across the group's subsidiaries.
Once an affiliated group elects to file a consolidated return, it must continue filing on that basis in every subsequent year unless the group ceases to exist or the IRS grants permission to discontinue. The IRS rarely approves a switch back to separate filing without a compelling reason, such as a substantial negative impact caused by a change in the Internal Revenue Code or regulations. This commitment makes the initial decision to consolidate a significant one that requires careful analysis of each member's projected financial performance.
State income tax treatment of affiliated groups varies. Some states automatically follow the federal consolidated return. Others require or permit combined unitary reporting based on separate state affiliation standards. Some states specifically prohibit consolidated returns. A corporation in an affiliated group for federal purposes may face entirely different grouping and reporting requirements at the state level, which can create significant compliance complexity for multi-state operations.
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