A reserve requirement (also called the cash reserve ratio, or CRR) is a monetary policy instrument that obliges commercial banks to keep a specified percentage of their deposit liabilities as reserves, either as vault cash or on deposit at the central bank. Because the unheld portion of deposits can be lent on, the ratio directly constrains the money multiplier and, in classical theory, the supply of broad money in the economy.
Raising the ratio tightens credit conditions by forcing banks to park more funds at the central bank; lowering it frees liquidity for lending. Historically this was a frontline tool, but in most advanced economies it has been displaced by open market operations, interest on reserves, and policy rate corridors. The U.S. Federal Reserve reduced reserve requirement ratios to zero percent in March 2020 and has not restored them, reflecting the shift to an "ample reserves" operating framework. The European Central Bank still applies a minimum reserve ratio (set at 1% since 2012) on certain short-term liabilities.
Reserve requirements remain a more active tool in emerging markets. The People's Bank of China adjusts its Reserve Requirement Ratio (RRR) several times a year as a primary lever of monetary stance, with separate ratios for large and small banks. The Reserve Bank of India similarly uses the CRR alongside its Statutory Liquidity Ratio (SLR).
For delegates and researchers, reserve requirements matter in three contexts:
- Macroeconomic stabilisation — managing inflation, credit booms, and capital inflows.
- Financial stability — providing a liquidity buffer, although Basel III's Liquidity Coverage Ratio now plays this role more directly.
- Capital flow management — some economies impose differentiated reserve requirements on foreign-currency deposits to dampen volatile inflows, a tactic studied by the IMF in its Institutional View on capital flows.
Critics note that high ratios act as an implicit tax on banks and can push intermediation into less-regulated shadow banking.
Example
In September 2024, the People's Bank of China cut the Reserve Requirement Ratio by 50 basis points to support the slowing Chinese economy, releasing roughly 1 trillion yuan in long-term liquidity.
Frequently asked questions
No. The U.S. Federal Reserve cut its ratios to zero in March 2020, and several advanced economies (Canada, the UK, Australia, New Zealand) abandoned the tool years earlier in favour of interest-rate-based frameworks. China, India, Brazil, and the euro area still use it.
Keep learning