In recent decades processes of partisan dealignment and professionalisation have taken place. But how do political parties adapt their financial behaviour to these changes in the political-electoral system? We answer this question by analysing two indicators. First, we examine to what extent parties spend their available financial means (saving versus spending strategy). Secondly, we study how parties spend their available financial means (bureaucratic versus electoral strategy). Based on these two indicators we set up a two-dimensional model describing the financial behaviour of political parties, which we apply to data of Belgian parties in the period 1999-2015. The results illustrate that most parties generally adopt a bureaucratic saving strategy, but that there has not been a linear evolution between 1999 and 2015 towards a specific financial behaviour as a reaction to dealignment and professionalisation.