Tax revenues are used to invest in sustainable development and economic growth in order to strengthen the effective functioning of the state, combat poverty, deliver public services and achieve other goals. This also applies to developing countries. However, developing countries and, in particular, the so-called Small Islands Development States (SIDS), including Curaçao, face many challenges in achieving these goals. SIDS additionally face other challenges because of their specific social, economic and environmental vulnerabilities. SIDS should focus on strengthening domestic resource mobilization. Despite their progress in improving tax systems, international regulations such as CRS, FATCA, BEPS have brought new challenges.