Correspondent Banking: How International Wire Transfers Actually Work

When you send an international wire transfer, most banking apps make it appear simple: enter the IBAN, confirm the SWIFT code, press send. What actually happens behind the scenes is considerably more complex — and that complexity is precisely why the transaction costs what it does, takes as long as it does, and occasionally disappears into a limbo that requires hours of investigation to resolve.

Understanding correspondent banking is not merely academic. For businesses transacting internationally, investors moving capital across jurisdictions, or HNW individuals managing multi-currency affairs, this knowledge helps you make smarter choices about how to execute payments, why intermediaries exist, and when specialist payment services offer genuine advantages over your bank.

The Core Problem Correspondent Banking Solves

Suppose your UK bank, Barclays, needs to pay a counterparty held at a small regional bank in Vietnam. Barclays almost certainly does not maintain a direct banking relationship with that Vietnamese institution — they do not hold accounts at one another, there is no direct settlement arrangement between them, and establishing one would be commercially impractical for what might be an infrequent payment corridor.

The correspondent banking network solves this by creating a chain of trusted intermediaries. Barclays maintains accounts at correspondent banks in major financial centres around the world. Those correspondents in turn maintain accounts at institutions deeper into regional markets. A payment from London to Vietnam might travel through Barclays → Deutsche Bank Frankfurt → a regional correspondent in Singapore → a domestic correspondent in Vietnam → the recipient's bank.

Each bank in this chain processes the instruction, deducts its fee, and forwards the remainder. This is efficient at scale but creates costs and delays that grow with each additional hop.

SWIFT: The Messaging System

SWIFT — the Society for Worldwide Interbank Financial Telecommunication — is not a bank and does not hold or move money. It is a secure messaging network that transmits standardised payment instructions between banks. Founded in 1973 and headquartered in Belgium, SWIFT connects over 11,000 financial institutions in more than 200 countries.

SWIFT codes (BIC — Bank Identifier Codes) identify the bank and, where relevant, a specific branch. An 8-character code (e.g. BARCGB22) identifies the bank; an 11-character code (BARCGB22XXX) identifies a specific branch. When making an international wire, the recipient must provide their bank's BIC together with their account's IBAN (International Bank Account Number).

Key SWIFT message types relevant to international payments:

• MT103: the standard customer-to-customer transfer instruction. This is the message your bank sends when you initiate an international wire. The MT103 carries all the details: ordering customer, beneficiary, currencies, amounts, and payment purpose. Requesting a copy of the MT103 from your bank is a standard first step in tracing a missing payment.
• MT202: a bank-to-bank transfer message, used when a correspondent sends funds to another correspondent on behalf of the underlying MT103 instruction.
• MT202 COV: an enhanced version of MT202 that now carries the underlying customer details — introduced to improve AML compliance across the chain.

SWIFT GPI (Global Payments Innovation) is a more recent development that adds real-time tracking to SWIFT transactions. Banks participating in SWIFT GPI provide a unique end-to-end transaction reference (UETR), enabling senders to track exactly where in the correspondent chain their payment sits at any given moment. The majority of major UK banks now participate in SWIFT GPI, and most USD transactions settle the same banking day; GBP and EUR transactions typically settle within 24 hours.

Nostro and Vostro Accounts

To send money abroad efficiently, banks pre-position funds in foreign currency accounts held at their correspondent banks. Understanding this mechanism demystifies a great deal of banking jargon.

Nostro accounts — from the Latin "ours" — are accounts that your bank holds in a foreign currency at an overseas correspondent. From Barclays' perspective, its USD account held at JPMorgan in New York is a nostro account. Barclays maintains a pool of dollars in this account which it draws down to fund outgoing USD transfers.

Vostro accounts — from the Latin "yours" — are simply the same accounts viewed from the correspondent's perspective. From JPMorgan's perspective, the account it holds for Barclays is a vostro account.

Banks actively manage their nostro balances. If a bank has run down its nostro position in a particular currency, it must replenish it through the FX market or by receiving inbound payments in that currency. During periods of market stress, nostro management becomes a significant treasury function.

How Charges Are Applied: OUR, SHA, and BEN

When initiating a SWIFT transfer, you are typically offered a choice of charging instruction. This is often underexplained by banks:

SHA (shared): the default at most banks. The sender pays their own bank's fee; each intermediary deducts its fee from the transferred amount; the beneficiary receives less than the gross amount sent. For a £50,000 transfer with two intermediary correspondents each charging £20–30, the beneficiary might receive £49,940–£49,960.

OUR: the sender instructs all charges to be borne by them. In theory, the beneficiary receives the gross amount. In practice, some correspondents do not honour OUR instructions and deduct regardless — particularly in less-regulated corridors — making the outcome unpredictable. Generally the appropriate choice for property completions and other transactions requiring exact amounts.

BEN: all charges borne by the beneficiary. Used rarely in commercial contexts; sometimes used for urgent small transfers where the sender wants certainty about their outgoing costs.

De-risking: The Hidden Cost of Compliance

A significant and growing problem in global correspondent banking is de-risking: major correspondent banks exiting high-risk country corridors to reduce their AML (anti-money laundering) compliance obligations and regulatory exposure.

The compliance cost of maintaining correspondent relationships in jurisdictions with weak AML frameworks, high rates of financial crime, or US sanctions exposure is substantial. For many large banks, the revenues generated by these corridors no longer justify the compliance investment. Since 2011, the number of active correspondent banking relationships globally has declined by approximately 20%.

The consequence for businesses and individuals transacting with affected countries is severe: fewer correspondents means fewer routes, less competition on fees, and slower execution. In extreme cases, banking access for an entire country is effectively cut off. Small island economies, certain African markets, and jurisdictions perceived as high-risk have been disproportionately affected.

For you, practically: if you regularly transact with countries where correspondent relationships are thin, expect higher costs, longer settlement times, and potentially the need to use specialist payment services rather than conventional SWIFT.

The Cost Comparison: Bank vs Specialist

A standard UK bank SWIFT transfer to an overseas account typically costs:

• A flat fee of £15–35 charged by your bank
• An FX margin of 2–4% if currency conversion is required
• Correspondent deductions of $10–40 per intermediary (under SHA)

On a £50,000 transfer requiring FX conversion, total costs can reach £1,500–£2,500.

Specialist payment institutions — Wise, OFX, Currencies Direct, moneycorp, and similar — typically route payments via local payment rails rather than SWIFT where possible. Rather than sending GBP via a correspondent chain to be converted abroad, they hold local currency accounts in the destination country and effect a local payment from those accounts, funding the position via their own FX book. This eliminates intermediary fees and reduces FX costs to 0.3–1.5% depending on the corridor and volume.

For businesses with high-volume payment needs, the savings over twelve months can be very significant indeed.

Domestic Alternatives: SEPA, CHAPS, and Faster Payments

Not all international-looking transfers require SWIFT:

SEPA (Single Euro Payments Area): covers more than 40 European countries and territories (as of 2026). EUR transfers between SEPA member countries are treated as domestic payments — no correspondent fees, typically no additional FX margin on EUR-to-EUR transfers, and settlement within one business day (standard SEPA Credit Transfer) or within ten seconds (SEPA Instant). Businesses operating across Europe should route EUR payments via SEPA, not SWIFT.

CHAPS: the UK's same-day high-value settlement system for sterling. Domestic, no correspondent chain. Used for property completions and large sterling transfers between UK accounts.

Faster Payments: the UK's near-instant retail payment system for sterling transfers up to £1 million per transaction. Free at most banks; widely used for routine domestic sterling transfers.

Emerging Alternatives to SWIFT

Several SWIFT alternatives have emerged, primarily driven by geopolitical tensions and a desire to reduce dependence on US dollar-denominated correspondent networks:

CIPS (Cross-Border Interbank Payment System): China's international payment system, launched 2015. Primarily serves RMB-denominated cross-border transactions. Growing adoption in Belt and Road partner countries.

SPFS: Russia's domestic alternative to SWIFT, developed after the 2014 threat of SWIFT exclusion. Limited to rouble transactions and Russia-affiliated corridors; excluded from mainstream international use.

India's UPI (Unified Payments Interface) has been extended to international payments for non-resident Indians and is increasingly interoperable with systems in Singapore, the UAE, and elsewhere.

These alternatives remain supplementary to SWIFT rather than replacements in mainstream international finance, but their growth reflects a broader trend towards multi-polar payment infrastructure.

Correspondent banking structures, SWIFT GPI coverage, and specialist payment provider capabilities evolve rapidly. Fees and settlement times described in this guide reflect the position as at 2026. Always verify current charges with your bank or payment provider before executing large transfers. Rules around AML and source-of-funds documentation change; seek professional advice for complex cross-border transactions.

How Global Investments Can Help

Managing international capital flows efficiently is central to cross-border investment. Whether you are completing a property acquisition, repatriating rental income, or moving capital between jurisdictions, the choice of payment route materially affects your costs. Global Investments can advise on payment strategy as part of our broader service to internationally mobile clients and property investors, and can introduce you to specialist providers suited to your payment corridors and volumes.

Contact us to discuss your international payment requirements.