Suchergebnisse

We analyze the optimal nonlinear income tax schedule when taxpayers earn multiple incomes and differ along many unobserved dimensions. We derive the necessary conditions for the government's optimum using both a tax perturbation and a mechanism design approach, and show that both methods produce the same results. Our main contribution is to propose a numerical method to find the optimal tax schedule. Applied to the optimal taxation of couples, we find that optimal isotax curves are very close to linear and parallel. The slope of isotax curves is strongly affected by the relative tax-elasticity of male and female income. We make several additional contributions, including a test for Pareto efficiency and a condition on primitives that ensures the government's necessary conditions are sufficient and the solution to the problem is unique.

This paper characterizes the optimal income and wealth tax schedules when rates of return are endogenous. Individuals exert investment effort in order to increase the return on their investments. Agents are heterogeneous along two dimensions: their investment ability and their labour market productivity. I show that when individuals can exert investment effort, the Atkinson-Stiglitz theorem that capital income should not be taxed does not hold. When the government observes wealth and capital income, it is optimal to tax capital income and subsidize wealth. When wealth is not observed, it is optimal to tax capital Income. The marginal tax rates on labour and capital income should not be equal, but they should be positively related to each other. The results extend to a model where individuals can hire investment advisors to increase the rate of return and also to a model with heterogeneous inheritance, in which case both capital Income and wealth should be taxed.

This paper addresses transboundary environmental problems in the context of an optimal tax problem, when part of the labor force is mobile across countries. The policy instruments include both commodity taxation and nonlinear income taxation. We show how the tax policy in a noncooperative equilibrium differs from that corresponding to a cooperative equilibrium. The results also indicate how a 'global policy maker' must act in order to make the national policy makers replicate the cooperative equilibrium.

I analyze international tax competition in a framework of dynamic optimal taxation for strategically competing governments. The global capital stock is determined endogenously as in a neo-classical growth model. With perfect commitment and a complete tax system (where all factors of production can be taxed), governments set their capital taxes so that the net return is equal to the social marginal product of capital. Capital accumulation thus follows the modified golden rule. This is independent of relative country size, capital taxes in other countries, and the degree of capital mobility. In contrast, with an exogenous capital stock returns on capital are pure rents and a government's ability to capture them is limited through capital flight, triggering a race to the bottom. With an endogenous capital stock, capital is an intermediate good and taxes on it are not used to raise revenues, but to implement the optimal capital stock. Even in a non-cooperative game it is thus not individually rational for governments to engage in tax competition. I provide a general proof that if the modified golden rule holds in a closed economy, then it also does in an open economy.