The British Royal Family is financed mainly by the hereditary revenues of the Crown. The British Parliament uses a percentage of the Crown Estate, a part of the Crown's hereditary revenues belonging to the sovereign that is placed at the disposal of the House of Commons, to meet the costs of the sovereign's official expenditures. This includes the costs of the upkeep of the various royal residences, staffing, travel and state visits, public engagements, and official entertainment. The Keeper of the Privy Purse is Head of the Privy Purse and Treasurer's Office and has overall responsibility for the management of the sovereign's financial affairs.