Conventions A bank counts a
nostro account with a debit balance as a cash asset in its
balance sheet. Conversely, a
vostro account with a credit balance (i.e. a deposit) is a liability, and a
vostro with a debit balance (a loan) is an asset. Thus in many banks a credit entry on an account ("CR") is regarded as negative movement, and a debit ("DR") is positive - the reverse of usual commercial accounting conventions. With the advent of computerized accounting, nostros and vostros just need to have opposite signs within any one bank's accounting system; that is, if a nostro in credit has a positive sign, then a vostro in credit must have a negative sign. This allows for a reconciliation by summing all accounts to zero (a
trial balance) – the basic premise of
double-entry bookkeeping.
Typical usage Nostro accounts are mostly commonly used for
currency settlement, where a bank or other financial institution needs to hold balances in a currency other than its
home accounting unit. For example: First National Bank of
A does some transactions (loans, foreign exchange, etc.) in USD, but banks in
A will only handle payments in AUD. So FNB of
A opens a USD account at foreign bank Credit Mutuel de
B, and instructs all counter-parties to settle transactions in USD at "account no. 123456 in name of
FNBA, at
CMB,
X Branch". FNBA maintains its own records of that account, for reconciliation; this is its
nostro account. CMB's record of the same account is the
vostro account. Now, FNBA sells AUD1,000,000 to
C (a
counterparty who has an AUD account with FNBA, and a USD account with CMB) for a net consideration of USD2,000,000. FNBA will make the following entries in its own accounting system: Over at CMB, they record the following transaction: If C does not have an account directly with FNBA's corresponding bank, the funds may be transferred within the banking system of country B by cheque or some form of
electronic funds transfer (EFT). In this case CMB will make entries on several other accounts, such as a teller's receiving account, or a
clearing account with the third bank holding C's account. ==See also==