Proof of Funds and SWIFT Messaging: A Clarification of Banking Reality 

In the realm of international finance, it is not uncommon for counterparties to demand a so-called “SWIFT confirmation of funds” as a precondition to engage in a transaction. The phrase has acquired a certain currency in commercial circles, yet it is surrounded by confusion and, regrettably, by exploitation in fraudulent contexts. International Finance Bank Ltd considers it a matter of professional duty to dispel these misconceptions and to articulate what the global SWIFT framework can and cannot achieve. 

The Nature of SWIFT Communication 

SWIFT is a secure interbank messaging system: it transmits instructions and statements, but it does not constitute money itself. Each message type serves a defined function within the architecture of international banking. Crucially, none of these formats authorises one bank to disclose to another the real-time account balance of a private client. Such data is protected by law and banking secrecy, and its disclosure via SWIFT is categorically prohibited. 

The Illusion of “Balance Confirmations”  

A recurrent fallacy is the belief that a bank may send a message – often styled as an MT199 or MT799 – to confirm that billions are held on deposit in favour of a client. In reality, such a construct has no legal force. An MT199 or MT799 is merely a free-text message, without any intrinsic weight as a financial undertaking. No regulated institution would rely on it as evidence of liquidity. 

What the Core Message Types Actually Mean 

• MT103 (Customer Transfer): The only incontestable demonstration of funds is actual settlement. An executed MT103 is not a promise, but a fact: value has moved.
• MT199 / MT999 (Free Format): Prone to misuse in fraudulent schemes. They convey messages, not money.
• MT760 (Guarantee / Standby LC): This is not a balance statement but a binding commitment of the issuing bank. It is the bank itself – not the client – that becomes obligated.
• MT799 (Pre-Advice): A courtesy declaration, sometimes used to signal intent, but devoid of binding effect and never a balance confirmation.
• MT940: Provides detailed end-of-day statement information (opening balance, transactions, closing balance). Sent by a bank to its customer (usually corporate treasuries or large institutional clients) via SWIFT. Enables corporates to reconcile their bank accounts automatically in treasury systems or ERP platforms. It is not used between correspondents for Nostro/Vostro reconciliation. It is customer-facing.
• MT950 (Statements): Used in Nostro/Vostro reconciliation between correspondents. Provides a daily statement of an account (opening, closing, and booked entries). Typically exchanged between banks in the correspondent/Nostro-Vostro relationship. Used by a correspondent bank to advise an account holder bank of balances and movements in its Nostro account. This is the true Nostro/Vostro reconciliation tool, cannot serve as “proof of funds” to external counterparties.

The Legitimate Path to Verification 

In regulated banking practice, verification of funds follows lawful, well-defined instruments: 

• Formal Bank Comfort Letters (BCLs), executed on letterhead and authenticated.
• Blocked-funds confirmations in escrow (please see below), where sums are ring-fenced and the blocking is duly notified.
• Settlement itself, the ultimate arbiter of liquidity.

Each of these channels carries legal weight and regulatory recognition. None requires – nor would tolerate – the disclosure of a client’s balance through an unauthorised SWIFT message. 

IFB’s Position 

At International Finance Bank Ltd, we categorically decline to engage in spurious “SWIFT balance confirmations.” We operate exclusively through the architecture of lawful banking: settlement messages, binding undertakings, escrow arrangements, and verified advisory instruments. This disciplined approach safeguards not only our institution but also the integrity of our clients’ transactions. 

International banking is a domain that tolerates no ambiguity. The mirage of “SWIFT proof of funds” dissipates upon contact with regulatory reality. What endures – and what we practise – are the instruments that carry true legal and financial force. 

For parties in possession of a financial instrument, or confronted with a proposed transfer whose authenticity requires examination, we provide a dedicated service of verification, valuation, and legal advisory: 

Blocked Funds Letters 

A blocked funds letter in escrow is not a SWIFT message category of its own – it is a formal bank undertaking communicated in one of three regulated ways, depending on the transaction structure and the jurisdiction. 

1. Escrow Account with Blocking Instruction  

• Mechanism: The client’s funds are placed in an escrow account, under a tripartite agreement between the client, the bank, and the escrow agent (law firm, notary, or regulated fiduciary).
• Communication:The bank issues a Bank Letter of Confirmation (BCL) or Escrow Confirmation Letter, stating that X amount is credited and blocked until release conditions are met. This letter is signed, stamped, and sent directly (often by encrypted PDF or courier) to the beneficiary’s bank or legal counsel. 

2. SWIFT Blocking Message 

• MT760 (Guarantee / Standby LC): The strongest and most formal channel. The issuing bank blocks funds and creates a direct obligation toward the beneficiary. This is effectively an escrow by guarantee.
• MT799 (Free Format Pre-Advice): Sometimes used to advise of blocked funds, but non-binding. A proper bank will usually refuse to rely on an MT799 without an accompanying MT760 or formal escrow deed.

3. On-Letterhead Blocking Confirmation  

• Instrument: “Letter of Blocked Funds” or “Escrow Letter.”
• Form: Written on bank letterhead, signed by two authorised signatories, often notarised or apostilled for cross-border use.
• Content: Must specify amount, currency, and account number, blocking period or expiry date, escrow conditions (release upon delivery of documents, counter-performance, or joint instruction), governing law and jurisdiction.
• Delivery: Usually transmitted directly between compliance/legal departments via encrypted e-mail or SWIFT MT799 for courtesy notification.

Best Practice 

• For transactions above USD/EUR 50 million, counterparties typically insist on MT760 or a notarised escrow confirmation from a bank of first-class standing.
• For mid-range corporate deals (USD/EUR 5–50 million), a bank letter of blocked funds coupled with a lawyer-held escrow deed is often deemed sufficient.

Critical Note 

• Any “blocked funds letter” without escrow, or issued via MT199/MT999, is economically inert and almost certainly fraudulent.
• Legitimate blocked funds confirmations are either (a) a legal escrow deed, or (b) a bank guarantee/standby LC communicated over SWIFT.