This work has three objectives: first, to provide a comprehensive review of administrative fees; second, to construct a comparative data set for 53 countries; and third, to perform an empirical analysis that highlights the main determinants of pension fees from a world-wide perspective. The paper provides an econometric analysis by using panel data techniques. It finds the greater statistical significance of market size, result that is reinforced by mandatory pension schemes. Other factors, such as structural country conditions, market's vertical integration and the presence of an occupational pension scheme, seem to be less relevant.