歐洲議會在歐盟裡是最具民主代表性的機構，但統合初期，歐洲議會只扮演被諮詢角色。直至1970年的盧森堡條約（Treaty of Luxembourg）與1975年的布魯塞爾條約（Treaty of Brusell）才賦予歐洲議會對歐洲共同體預算擁有部分決定權，以及對整個預算有駁回權。歐洲議會所擁有的預算權自1975年至2009年34年間未曾變更過。歐盟27個會員國2007年在葡萄牙首都簽訂里斯本條約，是項條約於2009年12月1日正式生效。在新條約的規範下，預算程序大幅改變，歐洲議會預算權大幅提昇。但歐洲高峰會仍然主導預算議題，多年財政架構仍然必須由歐洲高峰會認可，加上自主財源仍然由部長理事會決定，因此里斯本條約並沒有讓歐洲議會的預算權擴大到與部長理事會完全平等地位。歐洲議會依舊存在民主赤字。
The European parliament is the most democratic and representative institute in the European Union. In the early years of the European Integration, the EP just played a consultative role. Not until the Treaty of Luxembourg and Treaty of Brussels were signed in 1970 and 1975, was the EP given the last word on what is known as non-compulsory expenditure and the power to reject the budget as a whole. The power of purse of the EP given by the treaties has still remained unchanged for the past four decades. The 27 member states signed the Lisbon Treaty in Portugal in 2007. The new Treaty was ratified by the 27 member states and entered into force on December 1 2009. The new treaty gives the European Parliament more powers on budgetary matters. The European Parliament will be on an almost equal footing with the Council of Ministers on budgetary matters. But It is because EU’s budgetary issues are still under the European Council’s thumb , the Multiannual Financial Framework must be sanctioned by European Council and the own resources are still decided by Council of Ministers that the European Parliament will not be on an equal footing with the Council of Ministers on budgetary matters. As result of this, the European Parliament is still haunted by democratic deficit in the process of the European Integration.