Treasury Guide to nostro and vostro accounts Explained

Every cross-border payment a bank makes ultimately settles through a correspondent banking relationship, and at the heart of that relationship sit nostro and vostro accounts. For anyone preparing for the IIBF Treasury Management certification. Mastering these accounts is non-negotiable: they explain how rupees become dollars in a counterparty's books, how forex deals are funded, and how the back office spots a failed settlement before it becomes a loss. This guide walks through the definitions. The Latin logic behind the names, the reconciliation discipline that auditors scrutinise, and the exam-style nuances that trip up candidates.

The terms come from a banker's point of view. Nostro is Latin for "ours" and refers to our account held with a foreign bank, denominated in foreign currency. Vostro means "yours" and refers to an account a foreign bank maintains with us, usually in rupees. Understanding nostro and vostro accounts from this dual perspective is the single most important conceptual unlock in correspondent banking and a recurring theme in treasury question banks.

What Nostro and Vostro Accounts Actually Mean

A nostro account is an account that a domestic bank (say. An Indian bank) holds with a bank abroad, denominated in the foreign currency of that country. If State Bank holds a US dollar account with Citibank New York, that USD account is State Bank's nostro. It is how the Indian bank "parks" dollars so it can pay out foreign-currency obligations.

A vostro account is the mirror image: it is the account a foreign bank maintains with a domestic bank, typically in the domestic currency. When a German bank keeps an INR account with an Indian bank to settle its India-bound trade. That rupee account is, from the Indian bank's books, a vostro account.

• Nostro — "our account with you", held in foreign currency abroad.
• Vostro — "your account with us", held in home currency at home.
• Loro — "their account", a third-party reference to an account held by another bank, used when one bank refers to two others' arrangement.

The key examiner trap: the same physical account is a nostro to one party and a vostro to the other. Citibank New York sees State Bank's USD account as a vostro (an account a foreign bank holds with us); State Bank sees it as a nostro. The label depends entirely on whose ledger you are reading. Candidates who internalise this relativity rarely lose marks on nostro and vostro accounts. If you want structured drills on this, the CAIIB course and the practice tests cover correspondent banking in depth.

How These Accounts Power Forex Settlement

Treasury dealers buy and sell currencies all day, but a deal is only complete when funds actually move. That movement happens through nostro and vostro accounts. When an Indian bank sells USD/INR, it must pay dollars to the counterparty and receive rupees. The dollars leave its USD nostro abroad; the rupees arrive in its domestic account (or the counterparty's vostro is debited).

Consider a simplified flow for an import payment of USD 1 million:

• The importer instructs the Indian bank to remit USD 1 million to a US supplier.
• The Indian bank debits the importer's rupee account at the day's exchange rate.
• It then debits its USD nostro with the New York correspondent and instructs that bank to credit the supplier's bank.
• The correspondent confirms the debit via a SWIFT MT900/MT940 message, which feeds the reconciliation system.

Because settlement spans time zones, banks watch the funded position in each nostro carefully. Letting a nostro run a debit (overdraft) attracts steep charges and can breach the FEDAI and internal limits, so treasury runs a daily "nostro funding" exercise to keep balances adequate but not idle. Idle balances earn little and tie up capital; overdrawn balances cost interest. This balancing act sits at the core of liquidity management and links directly to the prevailing RBI rates that influence funding decisions. Settlement risk here is the well-known Herstatt risk — the danger of paying out one currency before receiving the other. Brushing up on forex basics via the JAIIB course helps connect these dots.

Mirror Accounts and the Reconciliation Discipline

Because a nostro is held in the books of a foreign bank, the domestic bank cannot directly see its real-time balance. So it maintains a mirror account — an internal shadow ledger in its own books that records every expected debit and credit to the nostro. Reconciliation is the daily process of matching the mirror account against the actual nostro statement received from the correspondent.

Reconciliation throws up outstanding items — entries in one ledger not yet matched by the other:

• Responded items — entries appearing in both the mirror and the nostro statement; these are matched and cleared.
• Unresponded items — entries the bank has booked in its mirror but which have not yet hit the correspondent's statement (or vice versa).

Persistent unreconciled items are a red flag: they can hide frauds, duplicate payments, or operational errors. RBI's guidance and bank audit policies require ageing analysis of outstanding entries, with senior sign-off on long-pending items. Strong reconciliation of nostro and vostro accounts is therefore both an operational-risk control and a compliance obligation. You can test your grasp of these concepts with a quick round on the match game.

Exam Pointers, RBI Norms and Common Pitfalls

For the IIBF Treasury Management paper, examiners reward precise definitions and the ability to apply them. Keep these points sharp:

• Direction of the label: always ask "whose books?" before calling an account nostro or vostro.
• Special Rupee Vostro Accounts (SRVA): under the RBI's 2022 framework for international trade settlement in INR, authorised dealer banks open SRVAs for partner-country correspondent banks, enabling cross-border trade to be invoiced and settled in rupees. This is a frequently tested current-affairs topic.
• Charges and float: nostro maintenance involves correspondent fees, value-dating and float; treasury optimises these.
• Reporting: nostro balances feed the bank's net foreign-currency position and onward regulatory returns.

Common pitfalls candidates should avoid include confusing the currency of each account (a vostro held with an Indian bank is normally in INR, not foreign currency), forgetting that the mirror account is internal and not a third correspondent account, and mixing up loro with vostro. Loro is simply a third-party reference — "their" account — used in tripartite correspondence, not a separate account category you would open. Staying current on regulatory changes through reliable sources such as the latest IIBF news and the official regulator keeps your answers exam-ready. A disciplined understanding of nostro and vostro accounts, mirror reconciliation and SRVA norms will comfortably cover the correspondent-banking weightage in the paper. For authoritative material, see the Reserve Bank of India and the Foreign Exchange Dealers' Association of India, and review the syllabus on the IIBF website.

Putting It Together: A Worked Settlement

Suppose Bank A in Mumbai must pay EUR 500,000 to a beneficiary in Frankfurt. Bank A holds a EUR nostro with a correspondent in Frankfurt. On the value date, Bank A instructs the correspondent (via SWIFT MT103) to debit its EUR nostro and credit the beneficiary's bank.

Simultaneously, Bank A passes a mirror entry debiting EUR 500,000. When the correspondent's MT940 statement arrives showing the debit, the back office matches it against the mirror entry and marks the item responded. The rupee leg — the cost of buying those euros at the card or interbank rate — hits the customer's account at home.

Now flip the perspective. A bank in Frankfurt that maintains an INR account with Bank A to receive India-bound flows sees that rupee account as its nostro; Bank A sees the very same account as a vostro. This is the relativity principle in action and exactly the kind of scenario examiners pose. Mastering nostro and vostro accounts at this applied level — tracing both currency legs and both ledgers — separates rote learners from candidates who genuinely understand correspondent banking and settlement.

Frequently Asked Questions

Conclusion: Lock In Your Treasury Marks

Nostro and vostro accounts are the plumbing of every cross-border settlement, and the IIBF Treasury Management exam tests them from definitions to applied reconciliation and the newer SRVA framework. Anchor your revision on the relativity principle, the mirror-account reconciliation cycle, and the difference between nostro, vostro and loro. Then put it to the test: attempt a timed quiz on the iibf.store practice tests and revisit any concept you miss. Consistent, scenario-based practice is what turns this high-yield topic into guaranteed marks. Explore more study guides on the iibf.store blog.