I recently conducted a literature review on the impact of tax reforms on private sector development as part of the Investment Climate Impact Project.1 My goal was to take stock of what is currently known about the impact of reforms that the World Bank is supporting in this area and to identify the gaps in knowledge that we ought to fill by conducting more impact evaluations. While tax reforms can have a broad range of effects in the economy, the focus here was on private sector outcomes only, as measured by investment, tax evasion by formal firms, formal firm creation, and firms’ economic performance.
It turns out that most papers in this area study the impact of changing tax rates. Both cross-country and micro-level studies suggest that lowering tax rates can increase investment, reduce tax evasion, promote formal firm creation and ultimately lead to an increase in firms’ sales and GDP growth overall. However, lowering tax rates also has important implications for government revenue and it is thus often difficult to balance the trade-offs between various goals of public policy.