Taxation and the Taylor principle

A nominal tax system is added to a sticky-price monetary business cycle model. When nominal interest income is taxed, the coefficient on inflation in a Taylor-type monetary policy rule must be significantly larger than one in order for the model economy to have a determinate rational-expectations equilibrium. When effective tax rates are raised by inflation, the stability of the economy's equilibrium can be adversely affected. Finally, when depreciation is treated as a charge against taxable income, an even larger weight on inflation is required in the Taylor rule in order to obtain a determinate and stable equilibrium.