The study shows the potential of behavioural microsimulation models as powerful tools for the ex ante evaluation of public policies. In particular, we focus on the effect of fiscal policies which could encourage Spanish mothers living in couples to enter in the labour market. The simulated reform consists in replacing the present in-work benefit by a benefit per children of 100 Euros per month for each child younger than 16 years old if the mother is working. The analysis is performed using the last updated version of the behavioural microsimulation model Gladhispania. To estimate labour supply reactions we follow the discrete choice approach of Aaberge et al. (1995) and van Soest (1995). The results reveal an increase in 6.45% the number of working mothers living in couples (reaching a 60% of participation) and a small reduction of the hours of work of their partners (0.11%). The total financial cost of the reform is around 2 million Euros (10% of the initial tax collection).
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