Bank reserves are banks' holdings of deposits in accounts with their central bank (for instance the European Central Bank or the Federal Reserve, in the latter case including federal funds), plus currency that is physically held in the bank's vault (vault cash). The central banks of some nations set minimum reserve requirements. Even when no requirements are set, banks commonly wish to hold some reserves, called desired reserves, against unexpected events such as unusually large net withdrawals by customers or even bank runs.
The Bank of England uses the term rest to describe the same concept.
- Reserves on deposit – deposit accounts at the central bank, owned by banks.
- Vault cash – reserves held as cash in bank vaults rather than being on deposit at the central bank.
- Borrowed reserves – bank reserves that were obtained by borrowing from the central bank.
- Non-borrowed reserves – bank reserves that were not obtained by borrowing from the central bank.
- Required reserves – the amount of reserves that banks are required to hold, determined by the central bank as a function of a bank's deposit liabilities.
- Excess reserves - bank reserves in excess of the reserve requirement. A portion of excess reserves (or even all of them) may be desired reserves.
- Free reserves - the amount by which excess reserves exceed borrowed reserves. (Vogel 2001:421)
- Total reserves – all bank reserves: vault cash plus reserves on deposit at the central bank, also borrowed plus non-borrowed, also required plus excess.
See also 
Vogel, Harold L. (2001). Entertainment Industry Economics: A Guide for Financial Analysis. New York: Cambridge University Press. ISBN 0-521-79264-9
- Documents, bibliographies, and statistical releases related to banking reserves available on FRASER