This report shows why Southeast Asian countries need to consider tax reforms after many struggled to finance massive public expenditure programs to combat COVID-19. The second in a four-part series, the report considers the impact of COVID-19 on Cambodia, Indonesia, Myanmar, the Philippines, and Thailand to lay out steps policymakers can take to create healthier fiscal spaces. It illustrates challenges faced around informality, tax collection, compliance, and progressivity. It emphasizes how preventing fraud, taxing wealth, and introducing environmental levies can help reduce poverty, tackle inequality, and contribute toward more sustainable growth. It is therefore crucial to understand the required policy responses as well as potential technologies that could help expand the tax base, increase tax compliance, and ease the process of paying taxes.