A nested account in correspondent banking is an arrangement where a foreign financial institution, called the respondent, reaches the U.S. financial system by routing its transactions through another bank’s existing U.S. correspondent account rather than opening one of its own. The respondent piggybacks on the correspondent relationship, and its customers’ payments move through the U.S. bank under the respondent’s name. That layered structure gives smaller and regional banks a path into major dollar-clearing networks, but it also creates anonymity that federal regulators treat as high-risk for money laundering and terrorist financing. Willful violations of the rules governing these relationships can carry up to 10 years in prison.
How the Arrangement Works
Picture the setup as a chain. A large U.S. bank (the correspondent) opens a correspondent account for a foreign bank (the respondent). That respondent then lets its own customers, or even other smaller banks, move money through the correspondent’s account. The correspondent provides the payment rails; the respondent brings the clients. In most cases the respondent pools all of its customers’ funds into a single omnibus balance at the correspondent, so the correspondent sees one account with one name on it rather than hundreds of individual sub-accounts.
The problem is visibility. During routine processing, the correspondent bank often cannot see who is actually sending or receiving a given payment. It sees the respondent’s name on the transaction, not the identity of the underlying customer. When another foreign bank is also routing transactions through that same respondent’s account, a second layer of nesting appears, and the U.S. correspondent is now two steps removed from the person whose money is moving. That opacity is exactly why regulators impose enhanced requirements on these relationships.
How a Nested Account Differs From a Payable-Through Account
Nested accounts are often confused with payable-through accounts, but the two work differently. A payable-through account is a demand deposit account where a U.S. bank opens a master checking account in a foreign bank’s name, and the foreign bank then subdivides it into sub-accounts for its own customers. Those sub-account holders become signatories on the account and can write checks, receive wire transfers, and conduct other banking activities directly through the U.S. bank’s systems.
A nested account keeps the foreign bank’s customers invisible to the correspondent. The respondent bundles its customers’ transactions and sends them through its own correspondent account without giving the U.S. bank any direct relationship with those customers. Both structures raise money-laundering concerns, but the regulatory framework treats payable-through accounts as a distinct category with their own enhanced due diligence rules under 31 C.F.R. § 1010.610.
Who Uses Nested Access
The range of institutions relying on nesting is broader than most people expect. Money services businesses use nested arrangements to process international remittances for customers who lack traditional bank accounts. Foreign banks in regions with limited access to major dollar-clearing systems depend on correspondent relationships to settle cross-border payments. Fintech companies and banking-as-a-service providers use nesting to offer payment features without holding full bank charters of their own.
The Shell Bank Prohibition
Federal law draws a hard line at one type of institution: the foreign shell bank. A shell bank is a foreign bank with no physical presence in any country. Physical presence under the regulations means a fixed office address where the bank employs at least one person full-time, maintains operating records, and is subject to inspection by the banking authority that licensed it. A post office box or a website does not count.
Section 313 of the USA PATRIOT Act treats shell banks as posing such extreme money laundering risk that no correspondent relationship with them is acceptable. The ban, codified at 31 U.S.C. § 5318(j) and implemented through 31 C.F.R. § 1010.630, is absolute. A U.S. bank cannot maintain a correspondent account for a foreign shell bank, and it must also take reasonable steps to ensure its correspondent accounts are not being used by a respondent bank to indirectly serve a shell bank through nesting.
What U.S. Banks Must Do Before and During the Relationship
The Bank Secrecy Act and the USA PATRIOT Act require every U.S. financial institution maintaining a correspondent account for a foreign bank to run a risk-based due diligence program. Under 31 U.S.C. § 5318(i), that program must be designed to detect and report money laundering conducted through those accounts on an ongoing basis.
Baseline due diligence includes assessing each correspondent relationship by looking at the foreign bank’s home jurisdiction, its regulatory environment, the products and services it offers, and its anti-money laundering track record. The statute then goes further than basic know-your-customer duties. It specifically requires the correspondent bank to determine whether the foreign bank provides correspondent accounts to other foreign banks and, if so, to identify those downstream banks and conduct appropriate due diligence on them. This is the statutory hook for what the industry calls Know Your Customer’s Customer, and it is what makes nested accounts a distinct compliance challenge rather than just another account type.
Enhanced due diligence kicks in automatically for foreign banks operating under offshore banking licenses, and for those licensed in jurisdictions designated as noncooperative with international anti-money laundering standards. The correspondent must take reasonable steps to identify each owner holding 10 percent or more of the foreign bank’s shares (where those shares are not publicly traded), conduct heightened scrutiny of account activity, and report suspicious transactions.
When due diligence or transaction monitoring reveals that a respondent is allowing nested access by other foreign banks, the FDIC’s examination guidance says the correspondent should consider one of three responses: perform due diligence on the nested users directly, restrict what transactions the respondent can process through the account, or terminate the correspondent relationship. The right choice depends on the severity of the risk. Doing nothing is not an option regulators will accept.
Documentation and Certification
Before a nested relationship can function, the U.S. correspondent must collect a specific set of records: the respondent’s written anti-money laundering program, proof that the respondent is actively licensed and supervised in its home jurisdiction, and the identities of all beneficial owners holding 10 percent or more of the respondent’s shares (for non-publicly traded institutions).
The centerpiece is the Certification Regarding Correspondent Accounts for Foreign Banks, required under 31 C.F.R. § 1010.630. In it, the foreign bank must declare that it is not a shell bank, that it does not provide correspondent services to shell banks, and it must identify a person residing in the United States who is authorized to accept service of legal process for records related to the account. The certification must be obtained at least once every three years. For accounts opened after October 28, 2002, the correspondent bank must obtain the certification within 30 calendar days of opening the account; failure to do so triggers a mandatory closure obligation.
If the correspondent bank later has reason to believe information in a certification is no longer accurate, it must ask the foreign bank to verify or correct it. If the foreign bank does not respond within 90 calendar days, the correspondent must close all accounts with that institution within a commercially reasonable time and cannot allow new transactions other than those needed to wind down the account. All original documents and copies must be retained for at least five years after the correspondent relationship ends.
Red Flags Correspondents Watch For
Correspondent banks are expected to monitor nested activity for warning signs. Federal examination guidance highlights several patterns:
- Payment messages missing required originator or beneficiary information, which undermines straight-through processing and suggests deliberate concealment.
- Payments flowing to or from shell companies that share the same registered-agent address, have no identifiable business purpose, or reference only invoice numbers without describing goods or services.
- A respondent bank describing its customers as operating in one industry while the actual transaction patterns involve entirely different goods, services, or geographic regions.
- An unusually large number of beneficiaries receiving funds from a single company, or multiple high-value transfers between shell companies with no apparent legitimate purpose.
- Frequent transactions across multiple countries, especially routings through higher-risk offshore financial centers.
- A respondent bank that delays or refuses to answer requests for information about its customers or the transactions flowing through the account.
When a correspondent spots these patterns and cannot resolve them through follow-up, federal regulations require filing a Suspicious Activity Report. If the correspondent cannot perform adequate due diligence at all, a SAR filing is mandatory.
Special Measures for High-Risk Jurisdictions
Beyond the baseline framework, the Treasury Department has authority under 31 U.S.C. § 5318A to impose special measures on foreign jurisdictions, financial institutions, or account types it finds to be of primary money laundering concern. At the lighter end, Treasury may require U.S. banks to apply additional due diligence to any correspondent account that could be processing transactions for a designated entity. At the heavier end, Treasury can prohibit U.S. banks from maintaining any correspondent relationship, direct or indirect, with a specific foreign institution.
The indirect prohibition is the one that matters most for nesting: a U.S. bank must ensure its correspondent accounts are not being used to route transactions for the designated entity through an intermediary. Recent designations have targeted institutions like the Huione Group (designated in October 2025), and earlier designations have covered banks in jurisdictions including North Korea and Myanmar.
Treasury can also issue subpoenas to any foreign bank that maintains a correspondent account in the United States, demanding records related to the account, including records held overseas. If the foreign bank fails to comply or to contest the subpoena, the U.S. correspondent must terminate the relationship within 10 business days of receiving written notice from the Secretary of the Treasury or the Attorney General.
Penalties When Compliance Fails
The penalty structure has both civil and criminal tracks. A financial institution or any partner, director, officer, or employee who willfully violates BSA requirements faces a civil penalty of up to the greater of the amount involved in the transaction (capped at $100,000) or $25,000 per violation. For ongoing compliance failures, a separate violation accrues for each day the violation continues and at each office or branch where it occurs, which is how penalties accumulate into the millions that enforcement actions regularly produce.
Criminal penalties are steeper. Under 31 U.S.C. § 5322, a willful violation carries a fine of up to $250,000 and up to five years in prison. If the violation is part of a pattern of illegal activity involving more than $100,000 in a 12-month period, or occurs while violating another federal law, the maximums jump to $500,000 and 10 years. These penalties apply to individuals as well as institutions, so compliance officers and senior management have direct personal exposure.
The Broader Environment: De-Risking
The compliance burden on correspondent banks has produced a side effect regulators did not fully anticipate. Rather than invest in the enhanced due diligence that nested relationships demand, many large banks have simply terminated their correspondent relationships wholesale, especially in emerging markets. Some of the biggest global banks have halved their correspondent relationships or exited entire countries.
For smaller banks and developing economies, the consequences are serious. When a regional bank loses its correspondent relationship, it may have to find an alternative partner on less favorable terms, a process that takes months and costs money. In some cases no alternative is available, and the bank loses its connection to the global payments system entirely. The products most affected include clearing and settlement, international wire transfers, cash management, and trade finance.
The downstream impact reaches ordinary people. When correspondent relationships disappear, remittances become more expensive and slower. Payments for medical care, education, and basic consumer goods get disrupted. People pushed out of the formal banking system often turn to less regulated channels, which increases the money laundering risk that de-risking was supposed to reduce. Anyone operating within a nested account structure should understand that the relationship exists in this environment of shrinking access and concentrated risk.