2026 Cross-Border Tax Planning: How Permanent U.S. Rate Changes Affect International Owners

Why the 2026 U.S. changes matter globally

Cross-border businesses often model tax using a combination of local-country tax, U.S. federal tax, withholding tax, treaty relief, and controlled-foreign-company rules. The OECD’s 2026 review describes significant U.S. legislation enacted on July 4, 2025, with several provisions applying or becoming important during 2026. Although the changes are U.S. rules, they can materially affect foreign founders, non-U.S. parent companies, U.S. subsidiaries, and globally mobile executives.

Main planning areas

The OECD identifies a permanent U.S. federal rate schedule based on the prior Tax Cuts and Jobs Act structure, an expanded standard deduction, and changes to itemized-deduction limits. For owners of pass-through businesses, the qualified business income deduction is also identified as a continuing feature. These provisions can alter the relative attractiveness of operating through a corporation, partnership, or other pass-through structure.

For multinational groups, the OECD highlights changes to foreign-derived deduction eligible income and net controlled foreign corporation tested income. It also reports that the Base Erosion and Anti-Abuse Tax rate is permanently set at 10.5% beginning in 2026, rather than the 12.5% rate that would have applied under prior law. The business-interest limitation also returns to an EBITDA-based calculation, replacing the EBIT-based approach in effect since 2022.

Practical example

Assume a foreign parent owns a U.S. operating company that pays interest to related parties and earns income from customers outside the United States. The group should recalculate:

• The U.S. company’s interest-deduction capacity under the EBITDA-based approach.
• Potential BEAT exposure on deductible payments to related foreign persons.
• The interaction between foreign-derived income deductions and foreign tax credits.
• Treaty withholding rates on dividends, interest, royalties, and service fees.
• Whether the existing legal entity still produces the intended after-tax result.

Action checklist

1. Rebuild the 2026 effective-tax-rate model by entity and jurisdiction.
2. Separate permanent rules from provisions scheduled to expire after 2028 or 2029.
3. Review intercompany financing and pricing documentation.
4. Test whether projected deductions create BEAT or interest-limitation exposure.
5. Confirm that treaty claims, beneficial-ownership evidence, and withholding certificates remain current.

These calculations should be coordinated with local-country rules because a U.S. deduction or exemption may not receive matching treatment abroad.