Reserve Requirement: central bank policy tool explained
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
A reserve requirement is the minimum fraction of customer deposits that a commercial bank must hold as reserves at the central bank or as vault cash. By raising or lowering this ratio, a central bank tightens or loosens the credit a bank can extend, which influences money supply, interbank rates, and broader financial conditions.
What is reserve requirement?
The reserve requirement is a regulatory ratio set by a central bank that obliges commercial banks to keep a specified percentage of their deposit liabilities in reserve form, either as balances at the central bank or as physical cash. It is one of three classical monetary policy tools, alongside open market operations and the policy interest rate. A higher ratio constrains how much a bank can lend from each unit of deposit, reducing the credit multiplier. A lower ratio frees up balance sheet capacity, supporting lending growth. Different deposit classes can carry different ratios, and reserves may be remunerated or unremunerated depending on the jurisdiction.
How traders use reserve requirement
The desk treats reserve requirement changes as structural liquidity signals rather than directional trade triggers. The People’s Bank of China uses required reserve ratio cuts as a recurring easing channel, and currency traders watch RRR announcements for shifts in CNY funding conditions and onshore liquidity. In emerging markets such as Brazil and Turkey, reserve requirement adjustments often arrive alongside or in place of rate moves, so they affect carry trade economics and local currency volatility. In the United States, the Federal Reserve set reserve requirements to zero in March 2020, so the tool is dormant there. Retail traders should pair any reserve requirement headline with the local interbank rate, government bond yields, and credit growth data to read the true policy stance.
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Common misconceptions about reserve requirements
Many retail traders assume reserve requirements still bind lending decisions in major advanced economies. They do not. The Fed moved to an ample reserves framework in 2020 and set the ratio to zero, while the Bank of England, ECB, and Bank of Canada either operate with very low ratios or use other liquidity tools as the active lever. A second misconception is that a reserve requirement cut is automatically bullish for risk assets. The market reaction depends on whether the cut signals broader policy easing, targets a specific funding stress, or simply offsets shrinking central bank liabilities elsewhere on the balance sheet.
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Frequently asked
What is the difference between a reserve requirement and the policy interest rate?
The policy interest rate is the price of short term central bank money and steers borrowing costs across the yield curve. The reserve requirement is a quantity rule that dictates how much of each deposit a bank must park in reserves before it can lend the rest. Rate changes work through price signals and expectations, while reserve requirement changes work through balance sheet capacity. Many central banks now prefer rate tools and open market operations as their primary instruments.
Does the United States still use reserve requirements?
The Federal Reserve reduced reserve requirement ratios to zero on 26 March 2020 and has not reinstated them. United States banks operate inside an ample reserves regime where the Fed steers the federal funds rate using interest on reserve balances and the overnight reverse repo facility. The reserve requirement still exists as a legal framework, but it is not an active policy lever, so traders should focus on IORB, ON RRP, and balance sheet runoff instead.
Why does China still adjust its required reserve ratio?
The People’s Bank of China runs a managed monetary system where credit allocation, capital controls, and currency management interact. Adjusting the required reserve ratio releases or absorbs base money across the entire banking system in one step, which is politically and operationally cleaner than open market operations for large liquidity shifts. RRR cuts are also a public signal of supportive policy without committing the PBoC to a benchmark rate cut, giving authorities flexibility on the CNY fixing.
How does a reserve requirement change affect the currency?
A reserve requirement cut typically loosens domestic liquidity and lowers short term funding rates, which can narrow the rate differential against other currencies and weigh on the local FX. A hike does the opposite, tightening conditions and potentially supporting the currency through higher funding costs. The size of the move and the broader policy backdrop matter, since markets often anticipate the change and price most of the impact before the announcement lands.
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