Correspondent Banking: How It Works, Risks, and Regulations

Correspondent banking is the arrangement that lets a bank move money into a country where it has no branches of its own. Under a formal agreement, a large internationally connected institution (the correspondent) performs cross-border services on behalf of a smaller or more localized institution (the respondent), covering wire transfers, currency exchange, trade finance, and check clearing. It is how a community bank in the Midwest can help a manufacturing client pay a supplier in South Korea without ever setting foot in Asia.

How the Two Banks Divide the Work

The correspondent is the service provider. It brings the global network: multiple currency capabilities, branches or partnerships across major financial centers, and the operational plumbing to execute payments in local markets. The respondent is the client. It keeps the customer-facing relationship and plugs into the correspondent’s infrastructure to offer international products it could never build on its own.

The economics are simple. The correspondent earns fees for each service performed. The respondent marks those services up to cover its costs and margin, and holds on to the direct relationship with the end customer. That layered structure is how global liquidity reaches markets that the world’s largest banks would never serve directly.

Nostro and Vostro Accounts

The accounting backbone of every correspondent relationship is a pair of linked ledgers. A nostro account, from the Latin for “ours,” is a bank’s record of funds it holds at another institution in a foreign currency. If a U.S. bank keeps euros at a German bank, the U.S. bank’s euro balance is its nostro account. The same balance viewed from the German bank’s side is a vostro account, meaning “yours.” Both entries reflect identical funds; only the perspective differs.

When a customer sends money abroad, the respondent instructs the correspondent to debit the vostro account and pay the recipient. No physical currency crosses a border. The transaction settles through coordinated debits and credits on both banks’ books, and both institutions reconcile these records daily. If balances drift out of alignment or liquidity runs low, the system breaks down, so banks monitor these accounts continuously throughout the trading day.

Settlement Risk

The main operational danger is settlement risk, sometimes called Herstatt risk after a 1974 German bank failure that left counterparties holding losses on half-completed foreign exchange trades. The problem is that the two legs of a currency transaction settle independently, often in different time zones and at different times of day. One bank can pay out the currency it sold and never receive the currency it bought.

Settlement risk has two components. Credit risk materializes when a counterparty fails permanently after you have already paid your side. Liquidity risk appears when the counterparty will eventually pay but cannot do so on time, leaving you short of funds you expected to have.

The institutional answer is CLS Bank, which settles foreign exchange on a payment-versus-payment basis. Neither leg of a trade settles unless both can settle simultaneously. CLS credits the buyer’s account in the purchased currency and debits the seller’s account in the sold currency at the same moment, eliminating the window where one party is exposed. Settlement members must maintain a non-negative overall balance across all currencies on their CLS accounts at all times, and the system applies haircuts to exchange rates and imposes per-currency limits to absorb adverse rate movements during the settlement window.

What Flows Through the Relationship

International wire transfers are the most visible service. Funds move between countries through messaging networks, with the correspondent executing the payment leg in its local market. Currency exchange is tightly linked to this, since the correspondent provides access to foreign exchange markets for the respondent’s customers. Trade finance is another core function, particularly through letters of credit that guarantee a seller will receive payment once shipping conditions are met. Check clearing rounds out the standard offerings, letting customers deposit checks drawn on foreign banks and receive local funds after the correspondent processes the item.

Fees are not always transparent. When a wire passes through one or more intermediary correspondents on its way to the final destination, each intermediary may deduct a fee before forwarding the funds. The three standard fee arrangements in international payments are OUR (the sender pays all fees), BEN (the recipient absorbs all fees), and SHA (fees are shared). Businesses sending high volumes of international payments learn quickly that choosing the wrong fee structure can erode margins on tight-margin transactions.

SWIFT: The Messaging Rails

Nearly all correspondent banking transactions travel over the SWIFT network, a messaging system that connects more than 11,000 financial institutions worldwide. SWIFT does not move money itself. It transmits standardized payment instructions that tell banks what to debit and credit. The reliability of the whole system depends on both banks interpreting those instructions identically, which is why messaging standards matter.

The industry has been migrating from legacy SWIFT message formats (the MT series) to ISO 20022, a richer standard that carries more structured information about each transaction. The coexistence period for cross-border payment instructions ended on November 22, 2025, so banks can no longer send legacy MT103 or MT202 messages as primary formats. Banks that have not fully migrated now rely on contingency processing and inflow translation services, both of which became chargeable in January 2026.

SWIFT’s Global Payments Innovation (gpi) service has changed visibility into cross-border payments. Every gpi payment carries a Unique End-to-End Transaction Reference that lets every bank in the payment chain track its status in real time. Nearly 60% of gpi payments reach the beneficiary’s account within 30 minutes, and almost all are credited within 24 hours. A stop-and-recall feature lets banks halt payments in flight when fraud or error is detected, reducing losses that historically were difficult to recover once funds had left the originating institution.

Onboarding a Correspondent Relationship

Before any transactions flow, the respondent must survive a rigorous onboarding review. The global standard is the Wolfsberg Group’s Correspondent Banking Due Diligence Questionnaire (CBDDQ), which collects detailed information about the respondent’s ownership structure, anti-money-laundering controls, and sanctions compliance.¹ The respondent must disclose its ultimate beneficial owners, describe how it detects suspicious activity and prevents terrorist financing, and show that its monitoring systems are functional and tested.²

Inaccurate or incomplete disclosures can result in immediate rejection or, if discovered later, termination of an existing relationship. Depending on the complexity of the respondent’s structure and the jurisdiction involved, due diligence costs can run from several thousand dollars to well over $50,000.³ Risk-based periodic reviews then keep the respondent’s information current, with higher-risk relationships reviewed more frequently.⁴

U.S. Regulatory Framework

The legal architecture governing correspondent banking in the United States rests on the Bank Secrecy Act, which requires financial institutions to keep records and file reports useful for detecting money laundering, tax evasion, and terrorism financing.⁵ Two provisions added by the USA PATRIOT Act in 2001 target correspondent relationships specifically. The Financial Crimes Enforcement Network (FinCEN) oversees enforcement.

Section 312: Enhanced Due Diligence

Section 312 requires every U.S. bank that maintains a correspondent account for a foreign financial institution to run a due diligence program with risk-based policies designed to detect and report money laundering. The program must assess the risk each correspondent account presents based on the foreign institution’s business, the jurisdictions it operates in, the quality of its home country’s anti-money-laundering regime, and its compliance track record.⁴

Enhanced due diligence kicks in for foreign banks operating under offshore banking licenses or licensed by countries designated as non-cooperative with international anti-money-laundering standards. For these higher-risk accounts, the U.S. bank must take reasonable steps to identify the foreign bank’s owners (if it is not publicly traded), conduct heightened scrutiny of account activity, and determine whether that foreign bank itself provides correspondent services to other foreign banks.⁶ The statute flatly prohibits U.S. banks from maintaining correspondent accounts for shell banks, defined as institutions with no physical presence in any country.

Section 311: Special Measures

Section 311 gives the Treasury Secretary authority to designate foreign jurisdictions, institutions, or transaction types as primary money laundering concerns. Once a designation issues, the Secretary can impose special measures on U.S. financial institutions ranging from additional recordkeeping to an outright prohibition on maintaining correspondent accounts with the designated entity.⁷

The Travel Rule

Banks involved in correspondent transactions must also comply with the Travel Rule, which requires collecting and transmitting identifying information about the sender and recipient for funds transfers of $3,000 or more. A 2020 proposed rule would have lowered this threshold to $250 for transfers that begin or end outside the United States, but that proposal has not been finalized.⁸ The $3,000 threshold remains in effect for 2026.

Penalties

The consequences for getting this wrong are severe. Civil penalties for violating the correspondent account due diligence or shell bank provisions can reach $1,000,000 per violation, with a floor of twice the transaction amount.⁹ Criminal penalties apply when violations are willful: up to five years in prison and a $250,000 fine for a standalone violation, or up to ten years and $500,000 when the conduct is part of a pattern of illegal activity involving more than $100,000 in a twelve-month period. Institutions themselves face criminal fines of up to $1,000,000 for violating the correspondent account provisions.¹⁰ The Anti-Money Laundering Act of 2020 added a provision requiring convicted individuals to forfeit any profits gained from the violation and repay any bonuses received during the year the violation occurred.

De-Risking

The compliance burden has produced a side effect known as de-risking: terminating or restricting correspondent relationships with entire countries or categories of customers to avoid compliance risk altogether, rather than managing it. The Financial Action Task Force has said this approach violates the spirit of its standards, calling wholesale account closures without individualized risk assessment inconsistent with the risk-based approach that international anti-money-laundering rules are built on.¹¹

The consequences for affected regions are real. When major banks cut correspondent ties with local institutions in small or developing countries, those institutions lose access to the global financial system. Money transfer operators lose their banking relationships, driving remittance costs up and pushing transactions into unregulated channels that are harder to monitor. The World Bank has flagged the Caribbean as particularly vulnerable and has warned that continued de-risking could cut off humanitarian organizations from the banking services they need to deliver aid in conflict zones and disaster areas.¹²

FATF guidance encourages correspondent banks to exhaust alternatives before closing accounts. Those alternatives include restricting specific products or transaction types, filing suspicious transaction reports while keeping the relationship open, and sustained dialogue with the respondent’s management about what improvements are needed to maintain the account. Termination should be a last resort, and when it does happen, the correspondent should provide enough notice for the respondent to find alternatives.¹¹

1
The Wolfsberg Group. Correspondent Banking and Payments
2
The Wolfsberg Group. Wolfsberg Correspondent Banking Principles 2022
3
Library of Congress. CRS In Focus IF10873 – Correspondent Banking
4
FFIEC BSA/AML InfoBase. Due Diligence Programs for Correspondent Accounts for Foreign Financial Institutions
5
Office of the Law Revision Counsel. 31 USC 5311 – Declaration of Purpose
6
Office of the Law Revision Counsel. 31 USC 5318 – Compliance, Exemptions, and Summons Authority
7
Office of the Law Revision Counsel. 31 USC 5318A – Special Measures for Jurisdictions, Financial Institutions, International Transactions, or Types of Accounts of Primary Money Laundering Concern
8
Federal Register. Threshold for the Requirement To Collect, Retain, and Transmit Information on Funds Transfers and Transmittals of Funds That Begin or End Outside the United States
9
Office of the Law Revision Counsel. 31 USC 5321 – Civil Penalties
10
Office of the Law Revision Counsel. 31 USC 5322 – Criminal Penalties
11
Financial Action Task Force. Guidance on Correspondent Banking Services
12
World Bank. De-Risking in the Financial Sector