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This paper addresses vulnerability of revenue to external shocks using export composition to capture economic structure and differentiating countries according to income levels, resource endowments and political regimes. This gives a richer characterisation than previous studies. Lower income countries are vulnerable to shocks, especially in terms of trade (associated with the greatest revenue loss): democratic regimes seem to be less vulnerable to revenue losses due to shocks than non-democracies whereas revenue in resource rich countries is more vulnerable to shocks (except natural disasters) than non-resource rich countries. We find a negative relationship between manufacturing exports and revenue in lower income countries.

A growing body of literature suggests that political regime type matters in determining taxation. However, research on the relationship of political regimes to taxation yields mixed results. To what extent does the democratic or authoritarian character of the polity impact on the level of taxation? The paper investigates the relationship between political regimes and tax-to-gross domestic product ratio, using a panel dataset of 131 countries and covering the period 1990-2008. Findings suggest that the character of the polity affects taxation, but there is no linear trend in favour of democracy. Rather, the results indicate a U-shaped relationship between polity and tax ratio.

Over the last two decades, semi-autonomous revenue agencies (SARAs) have become a key element of public administration reform. They are supposed to improve revenue mobilisation and stabilise state-taxpayer relations. But do SARAs really outperform conventional tax administrations? This article argues that they do. Presenting the results of a panel analysis of local tax collection in Peru between 1998 and 2011, it shows that municipalities with SARAs collect more revenue than those with conventional tax administrations. The results also indicate that local revenue is more stable in municipalities with SARAs, which is good for budget policy and planning.

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