United States v. Stuart

Articles XIX and XXI of the Convention between the United States and Canada Respecting Double Taxation, Mar. 4, 1942, 56 Stat. 1405-1406, T. S. No. 983, oblige the United States, upon request and consistent with United States revenue laws, to obtain and convey information to Canadian authorities to assist them in determining a Canadian taxpayer’s income tax liability. The question presented is whether the United States Internal Revenue Service may issue an administrative summons pursuant to a request by Canadian au*356thorities only if it first determines that the Canadian tax investigation has…