Tonnage and poundage Tonnage and poundage Tonnage and Poundage were certain duties and taxes first levied in Edward II's reign on every tun (cask) of imported wine, which came mostly from Spain and Portugal, and on every pound weight of merchandise exported or imported. Traditionally tonnage and poundage was granted by Parliament to the king for life until the reign of Charles I. Tonnage and poundage were swept away by the Customs Consolidation Act of 1787. Charles I's first Parliament, known as the Useless Parliament, broke with tradition and granted the king tonnage and poundage for a year rather than life out of
Net tonnage than 13, N and N shall be taken as zero." In the United States, net tonnage is used to determine eligibility for registering boats with the federal government. Vessels with net tonnage of five or more are eligible for federal registration and not required to display state registration numbers. Most vessels longer than 25 feet are five tons or more. Net tonnage Net tonnage (often abbreviated as NT, N.T. or nt) is a dimensionless index calculated from the total moulded volume of the ship's cargo spaces by using a mathematical formula. Defined in "The International Convention on Tonnage Measurement of