This paper considers some aspects of the effects of fiscal policy on macroeconomic adjustment in developing countries. First, the paper reviews the notion of the fiscal deficit in the partic ular context of developing countries. It then spells out the conditions under which the internal and external debts are sustainable and points out the role of the “twin deficits”. The paper then presents some evidence on the sustainability of the internal and external deficits in the context of some developing countries. Finally the paper develops the theme of endogeneity of money supply to fiscal policy and international capital flows and points out the difficulties faced by stabilization policy under these conditions.