Thames & Mersey Marine Insurance v. United States

Background

A corporation that underwrites marine insurance paid stamp taxes under the War Revenue Act of 1898 on policies insuring goods during sea voyages to foreign ports. The company issued open policies, received shippers’ declarations when cargoes were set aside for export, and delivered certificates of insurance and bills of lading that exporters used to obtain payment and to discount bills of exchange. The company paid the stamps monthly, sought a refund under the Act of July 27, 1912, after the Commissioner denied payment, and the District Court sustained the Government’s demurrer and dismissed the suit as to the tax’s validity.

Reasoning

The central question was whether the stamp tax on those marine insurance policies was so closely tied to the process of exporting that it was effectively a tax on exportation, which the Constitution forbids. The Court explained that insurance during the voyage is an ordinary and necessary shipping document required by commerce and by buyers and banks to complete export sales. Because such policies are integral to making exports — like bills of lading and freight — taxing them imposes a burden on exportation itself. For that reason the Court found the tax within the constitutional prohibition and reversed the lower court’s judgment.

Real world impact

The decision removes the particular federal stamp tax burden on marine insurance tied to actual exports and supports the insurer’s claim for refund. It limits the Government’s ability to impose similar taxes on documents that are part of the export process. The opinion does not decide questions about general insurance taxation or a State’s authority to regulate insurance within its borders.