The Institute for Fiscal Studies (IFS) is an independent economic research institute based in London, United Kingdom, which specialises in UK taxation and public policy. It produces both academic and policy-related findings.

In the United Kingdom, taxation may involve payments to at least three different levels of government: central government, devolved governments and local government. Central government revenues come primarily from income tax, National Insurance contributions, value added tax, corporation tax and fuel duty. Local government revenues come primarily from grants from central government funds, business rates in England, Council Tax and increasingly from fees and charges such as those for on-street parking. In the fiscal year 2014–15, total government revenue was forecast to be £648 billion, or 37.7 per cent of GDP, with net taxes and National Insurance contributions standing at £606 billion.