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The reserve requirement (or required reserve ratio) is a bank regulation that sets the minimum reserves each bank must hold to customer deposits and notes. These reserves are designed to satisfy withdrawal demands, and would normally be in the form of fiat currency stored in a bank vault (vault cash), or with a central bank.

The reserve ratio is sometimes used as a tool in monetary policy, influencing the country's economy, borrowing, and interest rates.[1] Western central banks rarely alter the reserve requirements because it would cause immediate liquidity problems for banks with low excess reserves; they prefer to use open market operations to implement their monetary policy. The People's Bank of China does use changes in reserve requirements as an inflation-fighting tool,[2] and raised the reserve requirement nine times in 2007. As of 2006 the required reserve ratio in the United States was 10% on transaction deposits (component of money supply "M1"), and zero on time deposits and all other deposits.

An institution that holds reserves in excess of the required amount is said to hold excess reserves.

Effects on money supply

Reserve requirements affect the potential of the banking system to create transaction deposits. If the reserve requirement is 10%, for example, a bank that receives a $100 cash deposit can lend up to $90 of that deposit, keeping only a $10 cash deposit within the bank. If the borrower then writes a check to someone who deposited the $90, the bank receiving that deposit can lend out $81. As this fractional-reserve banking process continues, the banks can expand the initial deposit of $100 into a maximum of $1,000 of money ($100+$90+81+$72.90+...=$1,000). In contrast, with a 20% reserve requirement, the banking system would be able to expand the initial $100 deposit into a maximum of $500 ($100+$80+$64+$51.20+...=$500). Thus, higher reserve requirements should result in reduced creation of transaction deposits.

Reserve requirements apply only to transaction accounts, which are components of M1, a narrowly defined measure of money. Deposits that are components of M2 and M3 (but not M1), such as savings accounts and time deposits such as CDs, have no reserve requirements and therefore can expand without regard to reserve levels. Furthermore, the Federal Reserve operates in a way that permits banks to acquire the reserves they need to meet their requirements from the money market, so long as they are willing to pay the prevailing price (the federal funds rate) for borrowed reserves. Consequently, reserve requirements currently play a relatively limited role in money creation in the United States.