Consolidated Tax Returns

Figures: tax year 2026

A consolidated Form 1120, U.S. Corporation Income Tax Return, combines eligible corporations under federal consolidated-return rules. Ownership establishes eligibility; a valid election establishes consolidated filing, and tax adjustments determine the income reported.

An affiliated group consists of includible corporations connected through qualifying stock ownership to an includible common corporate parent.

• The common parent must directly own at least 80% of voting power and at least 80% of stock value in at least one includible subsidiary.
• For every other includible subsidiary, one or more includible group corporations must directly own, collectively, stock satisfying both thresholds.
• Each percentage uses the stock counted under the affiliation rules. A voting-power percentage cannot compensate for an insufficient value percentage.
• Once included, a subsidiary contributes its entire applicable tax items. Consolidated income is not multiplied by the parent's ownership percentage.

The ownership chain below qualifies for consolidated Form 1120:

For consolidated Form 1120, Cedar's indirect economic interest in Maple equals $80\% \times 80\% = 64\%$. That multiplication does not defeat affiliation because Birch directly holds the required voting power and value in Maple.

Common mistakes

• Multiplying every ownership link. The chain's 64% indirect economic interest does not defeat Maple's membership when both direct ownership links satisfy the tests.
• Deferring the entire inventory gain. Full deferral leaves $\$114{,}000 - \$60{,}000 = \$54{,}000$, understating Example 1's group profit by $\$90{,}000 - \$54{,}000 = \$36{,}000$.
• Deducting only one royalty side. The staff draft's unsupported $30,000 subtraction must be reversed because both corresponding amounts were already included.

Bottom line

• Affiliation generally requires an includible corporate parent and qualifying direct ownership of at least 80% of both voting power and stock value through the group.
• Consolidated filing is initially elective, requires member consent and generally continues for all eligible members while the group remains in existence.
• The return includes all applicable member income and deductions without ownership-percentage scaling.
• Intercompany matching coordinates recognition with corresponding items; depreciation and current expenses can trigger matching before any outside asset sale.

Exam shortcut

Draw the ownership chain first. Mark vote and value separately, then check entity exclusions, excluded preferred stock and the election. Label each supplied amount as already included, already deducted or awaiting group computation. This prevents duplicate dividend exclusions and duplicate recognition of matched inventory gain. For homogeneous inventory, multiply the seller's transfer profit by the unsold proportion.

The full lesson (about 6,406 words, 43 min read) adds 8 worked examples, all 6 common mistakes, a self-check, free in the app.

Learning objectives

• II.A3

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