 If the company is taxed as a C-Corporation, then it may have to pay income taxes to the state (or states) it has filed a foreign corporation, in proportion to the income generated in each state.US Tax Law is complicated all by itself, and adding foreign registrations to an existing company adds to the complication.An issue that occurred during the 1990s for some larger companies involved tax treaties which allowed a corporation to change its jurisdiction as a domestic corporation from a U.S. State to the country of Bermuda, allowing it to save huge amounts of tax payments.