As financing needs increase, domestic revenue levels remain low in many countries. Bold reforms are needed to raise more tax and enhance domestic resource mobilisation to turn national development aspirations into reality. Countries are using integrated national financing frameworks (INFFs) to pursue such reforms, ensuring costs and benefits are adequately assessed and policies are tailored to their specific systems and characteristics. This brief explores the specific challenges faced by developing countries in raising sufficient domestic revenues to fulfill their sustainable development ambitions, and provides insight into how INFFs are contributing to overcome such challenges, with a focus on three key areas: increasing domestic revenue mobilisation, aligning incentives with sustainable development priorities, and strengthening institutions and systems.