This study investigates the capacity of governments to reallocate spending across different functions of the government. It mobilises the COFOG dataset for the period 1996 - 2017, which allows comparing public spending mixes at detailed levels in ways that are consistent across countries and over time. Three main empirical findings are established. Firstly, countries differ in their propensity to reallocate public spending across functions and countries that reallocate more are also countries with sounder governance and tighter fiscal rules in place. Secondly, obstacles to reallocation are identified, with governments avoiding nominal cuts, especially in health and social expenditures. Thirdly, while the analysis underlines some degree of convergence among OECD countries in terms of public spending allocation, this convergence is not universal. A cluster of Nordic countries persists, and Greece is identified as diverging from the rest of countries included in the sample.