This article investigates how Members of the European Parliament (MEPs) allocate resources between their parliamentary and constituency work, focusing on their staffing decisions. Specifically, it examines the distribution of MEPs’ staff between accredited assistants, based in the European Parliament (EP), and local staff working in their constituency. The study seeks to explain why some MEPs allocate a larger share of their staff to constituency work compared to others by testing several hypotheses related to the individual characteristics of MEPs while controlling for variations across Member States. Using a newly developed database with data on MEP assistants at three points during the 9th EP, the analysis reveals that Member State differences do not solely explain the variation in staff distribution. While there is no evidence that staff allocation is driven by strategic considerations to secure re-election, it depends significantly on their ideology and past political experience.