The paper aims to identify the optimal size, speed and composition of the medium-term fiscal adjustment in the context of Sudan's limited oil reserves. The permanently sustainable non-oil primary balance approach suggests the need for significant fiscal adjustment over the medium term, requiring a widening of the tax base. Cross-country comparisons highlight VAT and personal income tax (as well as tax administration) as key areas for reform. The paper also suggests the need for complementary expenditure-side measures in the areas of petroleum pricing and anchoring fiscal policy in non-oil indicators.