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We evaluate reforms to the U.S. tax system in a life-cycle setup with heterogeneous married and single households, and with an operative extensive margin in labor supply. We restrict our model with observations on gender and skill premia, labor force participation of married females across skill groups, children, and the structure of marital sorting. We concentrate on two revenue-neutral tax reforms: a proportional income tax and a reform in which married individuals file taxes separately (separate filing). Our findings indicate that tax reforms are accompanied by large increases in labor supply that differ across demographic groups, with the bulk of the increase coming from married females. Under a proportional income tax reform, married females account for more than 50% of the changes in hours across steady states, while under separate filing reform, married females account for all the change in hours.

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What are the macroeconomic effects of transfers to households with children? How do alternative policies fare in welfare terms? We answer these questions in an equilibrium life-cycle model with household labour supply decisions, skill losses of females associated to non-participation, and heterogeneity in terms of fertility, childcare expenditures, and access to informal care. Calibrating our model to the U.S. economy, we first provide a roadmap for policy evaluation by contrasting transfers that are conditional on market work (childcare subsidies and childcare credits) with those that are not (child credits), when both types can be means tested or universal. We then evaluate expansions of current arrangements for the U.S. and find that expansions of conditional transfers have substantial positive effects on female labour supply, that are largest at the bottom of the skill distribution. Expanding childcare credits leads to long-run increases in the participation of married females of 10.6%, while an equivalent expansion of child credits leads to the opposite ($-$2.4%). Expanding existing programs generates substantial welfare gains for newborn households, which are largest for less-skilled households. Expanding childcare credits leads to the largest welfare gains for newborns and achieves majority support.

In the past decades, elimination of the pay-as-you-go system in U.S. has been extensively discussed and studied. Such an elimination would also eliminate the intra-cohort redistribution done by the following policies of social security. Due to spousal and survivor's benefit provisions, the system redistributes (mostly) to single-earner married households (not necessarily progressive). Retirement benefits are a concave function of past mean earnings. Hence, the system redistributes from high earners to low earners. Finally, the existence of a cap on social security taxable earnings makes the system regressive. This is the first paper that quantifies redistributive, labor supply, and welfare implications of these policies using a general equilibrium life-cycle model. Agents start out as permanently married or single and with education levels and wage profiles, where the latter depend both on education and gender. The household is the decision maker and decides on the labor supply of its member(s) and saving. The aggregate production function has as inputs capital and labor aggregated by efficiency. Elimination of these policies results in a 6.1% increase in married female labor force participation rate. The middle-income single-earner married households experience the largest welfare losses whereas the high-income two-earner households together with high-income single households experience the largest welfare gains.JEL Classifications: E62, H31, H55, J12