Treasury Proposes OBBBA Pro‑Rata Rules for CFC Income
New Treasury rules would change how U.S. shareholders compute their share of controlled foreign corporation income.
The Treasury Department has unveiled a proposal to implement statutory amendments from the One Big Beautiful Bill Act (OBBBA) that would impose pro‑rata rules on controlled foreign corporation (CFC) income for U.S. shareholders. Under the current scheme, shareholders can allocate CFC income between business, passive, and attributable categories; the proposal mandates a uniform “pro‑rata” calculation intended to simplify compliance but could increase the U.S. tax burden for entities that previously benefited from preferential treatment. The rules would also broaden the definition of eligible CFCs and tighten reporting requirements, reducing flexibilities regarding income shifting and foreign asset ownership. Major multinational clients—especially those with subsidiaries in low‑tax jurisdictions—will need to reassess their CFC structures and potentially adjust transfer pricing, tax reserve calculations, and carryback/ carryforward strategies. Key takeaways for counsel include studying the impact on existing CFC elections, preparing for increased compliance costs, and lobbying for legislative fixes or clarifications before the final rule issues. Firms should also monitor proposed model CFC tax treaty provisions that may be negotiated to mitigate the impact.