This article examines the determinants of the annual overall spending levels of political parties from a comparative perspective. On the basis of a dataset with 1,317 observations from 99 parties in nine European parliamentary democracies, we illustrate that the spending levels of parties – calculated on the basis of Nassmacher’s index of political spending – have not systematically increased over the past decade. A multilevel analysis shows that, at the country level, spending levels are higher in countries with a longer tradition of public funding, a higher effective number of parties and a shorter democratic tradition. They are also higher in election years, but this effect is moderated when campaign spending limits apply. At the party level, spending levels increase with party strength and party age. Party ideology and government participation, on the other hand, do not have an effect.
