Tax Legal Services · Primary-source case analysis

National Carbide: A Controlled Subsidiary Is Not Automatically the Parent’s Tax Agent

By Aneeta Mishra and Timothy Chan

Published May 14, 2026

National Carbide Corp. v. Commissioner examined whether subsidiaries operating under parent-company agreements could disregard their separate taxable income as agents.

Corporate control did not erase separate existence

The parent owned and directed the subsidiaries, but ownership and control alone did not make their business income the parent's income.

Agency requires more than labels

An agreement calling a corporation an agent does not control when the entity conducts business, holds assets, and earns income in its own name.

The subsidiaries used parent-provided assets

The Court considered whether income was attributable to the subsidiaries' operations rather than simply to assets furnished by the parent.

The Tax Court's allocation stood

The subsidiaries were taxable on the earnings attributed to their separate activities.

Key takeaways

• Respect entity-level books, contracts, and operations.
• Test agency substance rather than corporate-family labels.
• Identify who owns assets and who performs income-producing activity.
• Consider current consolidated-return and transfer-pricing rules separately.