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 up until the reign of Charles I, to whom Parliament only granted it for a year out of concerns over the free-spending habits of Charles and Charles' desire to become involved in the Thirty Years' War on the continent. This restriction was seen as a provocative step by Parliament as it was the King's main source of revenue, and Parliament intended the one-year limit to curb Charles' autonomy by forcing him to request money from Parliament every year thereafter. Although Parliament passed this bill, the Duke of Buckingham led a successful effort in the House of Lords to block it. As a result, Parliament granted Charles no tonnage and poundage rights at all, which, combined with Parliament's efforts to impeach the Duke of Buckingham, led to Charles' first Parliament being dissolved.
Charles, however, continued to collect unauthorized tonnage and poundage duties, and this action became a chief complaint of Charles' failed second Parliament. When Charles moved to adjourn the Parliament, members held the speaker, John Finch, in his seat until three resolutions could be read, one of which declared anyone who paid unauthorized tonnage and poundage to be a betrayer and enemy of England.
Charles I's levying of tonnage and poundage without parliamentary sanction continued to be one of the complaints of his Long Parliament. The refusal of and subsequent disputes about tonnage and poundage rights is seen as one of the many events bearing responsibility for the English Civil War. Tonnage and poundage were swept away by the Customs Consolidation Act of 1787.