We derive a general optimal income tax formula when individuals respond along both the intensiveand extensive margins and when income effects can prevail. Individuals are heterogeneous across twodimensions: their skill and their disutility of participation. Preferences over consumption and...

We characterize optimal redistributive taxation when individuals are heterogeneous in their skills and their values of non-market activities. Search-matching frictions on the labor markets create unemployment. Wages, labor demand and participation are endogenous. Average tax rates are increasing...

We consider an optimal nonlinear income tax problem in a model with search-matching unemployment and where the negotiated pre-tax wage decreases with mar-ginal tax rate but increases with the level of tax. By omitting labor supply responsesand assuming bene?t for the unemployed and an e¢ cient...