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The aim of the present study is to show the potential of behavioural microsimulation models as powerful tools for the ex ante evaluation of public policies. We analyse the impact of recent Spanish income tax reforms upon efficiency and household and social welfare and study the effects of various (basic-income and vital-minimum) flat tax schemes. The analysis is performed using a microsimulation model in which labour supply is explicitly taken into account. Instead of following the traditional continuous approach (Hausman, Labour supply, Aaron and Pechman (eds.), How Taxes Affect Economic Behaviour, The Brooking Institution, Washington, DC, 1981; Econometrica, 53: 1255–1282, 1985; Taxes and labour supply, Auerbach and Feldstein, (eds.), Handbook of Public Economics, North-Holland, Amsterdam, vol. 1, 1979), we estimate the direct utility function employing the methodology proposed by …