Cross-border business sales are among the most complex transactions in tax law. When a Canadian resident sells a U.S. business, two countries assert taxing rights over the same gain, and without proper treaty planning, the seller can end up paying far more than either country intended.

The Default: Double Taxation

The U.S. taxes the gain because the business is located in the U.S. Canada taxes the gain because the seller is a Canadian resident. Without intervention, both countries tax the full amount.

The U.S.-Canada Tax Treaty (Article XIII) provides relief through foreign tax credits and specific allocation rules. But the treaty doesn't apply automatically, it requires deliberate elections and proper filing.

FIRPTA Withholding

Under FIRPTA (Foreign Investment in Real Property Tax Act), the buyer is required to withhold 15% of the gross purchase price when purchasing a U.S. real property interest from a foreign person. This withholding applies to:

  • Direct real property sales
  • Sales of stock in U.S. real property holding corporations (USRPHCs)
  • Certain partnership interest dispositions
On a $10M sale, default FIRPTA withholding is $1.5M, held by the IRS as a credit against the seller's eventual U.S. tax liability. We routinely apply for withholding certificates to reduce this amount to the actual expected tax, freeing up hundreds of thousands in cash flow at closing.

Treaty Elections That Matter

Several treaty provisions can significantly reduce the total tax burden:

  • Article VII (Business Profits): If the gain is characterized as business profits rather than capital gains, different allocation rules may apply
  • Article XIII (Capital Gains): Specific rules for real property, business assets, and shares
  • Article XXIV (Foreign Tax Credit): Credits for U.S. taxes paid against Canadian liability
  • Article XXV (Non-Discrimination): Ensures foreign sellers aren't taxed more harshly than domestic ones

The ordering and interaction of these provisions matters enormously. A different characterization of the same gain can shift hundreds of thousands in tax between the two countries.

California Complications

California taxes nonresidents on California-source income. If the business is located in California, the seller faces up to 13.3% California income tax on the gain, and California does not recognize foreign tax credits the same way the federal government does.

For Canadian sellers of California businesses, we model three layers: U.S. federal, California, and Canada. Each layer has its own rules, and the foreign tax credit calculations must be sequenced correctly to avoid under-crediting.

Our Approach

Max Panchuk is a triple citizen (US/Canada/EU), cross-border tax isn't a service line for our firm, it's how he thinks. We approach cross-border sales with a framework that models all jurisdictions simultaneously:

  • Structure the transaction to optimize treaty benefits
  • Apply for FIRPTA withholding reduction certificates
  • Sequence foreign tax credit elections across all jurisdictions
  • Coordinate with Canadian tax counsel on CRA filing requirements
  • Model California as a separate layer with its own sourcing rules
Cross-border sales aren't just more complex. They're differently complex. The planning that works for a domestic seller can actively harm a cross-border seller. Start with the treaty, not the return.

This article is for general informational purposes only and does not constitute tax, legal, or investment advice. Business owners should consult qualified tax and legal advisors before entering into a transaction.