The PNG Goverment increased its tax ratio from 6.6 to 15% over the period, 1965–1977. Estimates of the buoyancy and the elasticity of the major taxes are also high compared to those obtained for other less developed countries. There are significant differences between the tax bouyancy and the tax elasticity to show that considerable efforts were made to collect more tax revenue through discretionary fiscal policies. However, a possible weakness exists in these discretionary policies, in that the collection of more revenue was brought about mainly by raising the tax rates of the existing major taxes and little attention was paid to the search for new tax bases.