This article explores the impact European Union (EU) integration has had on methods and processes of budgeting in France and Britain from 1970 to 1995. It assesses whether convergence of budgetary institutions occurs and, if so, whether it is promoted by an obligation of compliance or by an hybridization effect. Compliance refers to changes in national budgetary institutions made compulsory by membership in the EU. Hybridization emphasizes that national and EU budgetary processes are increasingly interwoven and indivisible. Public budgeting is no longer purely national because part of the decision-making on national expenditure is made at the EU level and because the national budget is closely linked to the EU budget in financial and policy terms. Based on an institutional analysis, combined with elite interviewing, the article suggests that hybridization is a significant factor contributing to a convergence of budgetary practices in Britain and France. Underlying the argument is the fact that an increasingly important function of departmental actors involves negotiating with their EU counterparts at the EU level, in addition to the conventional budgetary game at the domestic level. Regarding compliance, there is an influence as testified by significant formal institutional convergence. However, compliance seems a less effective factor in influencing convergence than hybridization because it conveys a "negative" approach to convergence, based on enforcement and sanctions. The article suggests that the convergence of administrative systems is promoted by the growing similarity of administrative practices more than by the harmonization of rules.