This paper produces regression estimates of the elasticity of taxable income in New Zealand using two new instruments applied to a substantial tax reform ‘experiment’. Instrumental variable methods are required to deal with endogeneity of the tax rate and taxable income in a non‐linear tax...

This paper examines estimation of the elasticity of taxable income using instrumental variable regression methods. It is argued that the standard instrument for the net-of-tax rate - the rate that would be applicable post-reform but with unchanged income levels - is unsatisfactory in contexts...