Stop Corporate Inversions Act of 2026

This bill amends U.S. tax law to prevent corporations from avoiding U.S. taxes through "inversions," where a foreign company acquires a U.S. business and moves its tax residence abroad. It treats certain foreign corporations as domestic for tax purposes if they acquire a U.S. entity after May 8, 2014, and either have over 50% of their stock held by former U.S. shareholders or maintain significant U.S. operations (at least 25% of employees, compensation, assets, or income in the U.S.). Exceptions apply if the corporation has substantial business activities in its original foreign country. The changes apply to taxable years ending after May 8, 2014, targeting tax avoidance strategies rather than affecting most standard multinational businesses.