Revenue mobilization is a key constraint to economic development in the Republic of Guinea. The government’s five-year development plan (2016-2020) aims at fostering higher and more inclusive growth through public investments that require financing beyond current fiscal capacity. In this context, Guinea is seeking to efficiently raise additional domestic revenues and external investment financing. Development partners are supporting Guinea with technical assistance for revenue mobilization. The International Monetary Fund (IMF) and the European Union are supporting authorities with direct tax policy, non-tax revenue, and administration issues. The objective of this report is to shed light on indirect taxes, particularly value-added tax (VAT) and excise taxes. The report provides an overview of the main features of tax policy and administration in Guinea, followed by a more detailed analysis of VAT and excise taxes. The focus on indirect taxation is a result of both its significant revenue potential and coordination with other development partners. The analysis presented fills an important gap in the understanding of how Guinea can increase its tax revenues. On VAT, the study finds that addressing policy and administrative constraints can mobilize additional revenues while improving the business climate. On excise taxation, the study finds that existing excise rates are unevenly applied, with scope for raising rates in the future. To systematically address its revenue challenges across all tax types, Guinea should also consider development of a medium-term revenue strategy (MTRS). The report is structured as follows: in the first section, an overview of the evolution and composition of domestic revenues in Guinea is presented. In the second section, VAT is analyzed. The final section reviews excise tax policy and its implementation on international goods and domestic goods.