Having implemented a substantial fiscal response to COVID-19, Thailand's government now faces the medium-term challenge of reducing elevated deficit and debt levels, and the structural challenge of meeting rising spending needs, including those associated with an aging population, while maintaining fiscal sustainability. In this context, this Public Revenue and Spending Assessment sets out revenue and expenditure choices that will help to ensure a more inclusive and sustainable economy. This will require raising revenue, improving the efficiency of public spending, and ensuring that revenue and spending policy measures support the most vulnerable and are responsive to climate-related challenges. Within this overall framework, the report provides several recommendations to improve the quality of spending in the health, education, and social protection sectors, as well as a detailed assessment of fiscal policies that will contribute to the achievement of climate mitigation and adaptation goals.