The design of intergovernmental fiscal relations can help to ensure that tax and spending powers are assigned in a way to promote sustainable and inclusive economic growth. Decentralisation can enable sub-central governments to provide better public services for households and firms, while it can also make intergovernmental frameworks more complex, harming equity. The challenges of fiscal federalism are multi-faceted and involve difficult trade-offs. This synthesis paper consolidates much of the OECD’s work on fiscal federalism over the past 15 years, with a particular focus on OECD Economic Surveys. The paper identifies a range of good practices on the design of country policies and institutions related strengthening fiscal capacity delineating responsibilities across evels of government and improving intergovernmental co-ordination.