Abstract:  This paper studies optimal fiscal policy in a small open economy model under incomplete financial markets, where interest rates, government spending and productivity are stochastic and taxes are distortionary. The contributions of the paper are twofold. First, I solve the Ramsey problem and characterize the properties of the optimal fiscal policy. Second, I show that the optimal fiscal policy consists in smoothing tax distortions over time. The income tax rate, and the public debt are very persistent irrespective of the degree of autocorrelation of the shocks generating aggregate fluctuations. The government finances an increase in government spending or a decrease in the tax base partly by increasing debt and partly by increasing the tax rate.