Offshore Bank Tax Settlement Breaches: What the Banks Left Undisclosed

Bankers who keep hiding accounts after an agreement can expose an offshore bank tax settlement breach, as the Justice Department described at Credit Suisse. A later disclosure can also expose accounts that should have been included in the original resolution. If you worked on the account review, the customer files or the disclosure itself, you may know exactly where the bank’s account of its business parted company with the business it kept doing.

This page follows what offshore banks disclosed and did after their first resolution. Our offshore tax evasion page follows the banking services behind the concealment.

What Did the Offshore Banks Agree to Disclose?

Swiss Bank Program agreements required cooperation, account information and remedial controls. The Justice Department’s Tax Division resolved potential criminal liability through non-prosecution agreements, with assistance from IRS Criminal Investigation and the IRS Large Business and International Division. Those obligations reached beyond signing an agreement: account information and cooperation were part of what the banks owed afterward.

For someone who helped prepare a disclosure, the important comparison is between the accounts reviewed inside the bank and the accounts included in what it told the Justice Department. Ownership records, transaction histories and tax-compliance documents can explain why a particular customer belonged in that population. The later Bonhôte, Coutts and UBP agreements expressly acknowledged that additional accounts should have been disclosed when the original agreements were signed.

An account omitted from an earlier review raises questions about the information available then and the decisions that shaped the disclosure. Continued servicing after the resolution raises questions about what employees and managers kept doing. Credit Suisse’s later criminal case supplies a concrete example of that continued conduct.

Credit Suisse’s Earlier Plea Did Not End the Concealment

Credit Suisse AG’s guilty plea admitted helping U.S. taxpayers file false income tax returns and other documents with the IRS. The admitted business used sham entities, false beneficial-owner forms, destroyed records, cash delivery, structured transfers and offshore payment cards. These were banking services organized around keeping the customer and the money out of the tax authorities’ view.

In the separate May 2025 criminal resolution, Credit Suisse Services AG pleaded guilty to conspiring to hide more than $4 billion in at least 475 offshore accounts from the IRS. The admitted conduct ran from January 2010 through about July 2021. Credit Suisse AG entered the earlier plea and was the bank whose later conduct the Justice Department described as a breach.

The Justice Department’s account of the later criminal case described bankers falsifying records, processing fictitious donations and servicing accounts without tax-compliance documentation. It stated the connection to the earlier agreement directly:

We see a plea agreement on paper and, in the Justice Department’s account, bankers still servicing accounts without tax-compliance documents. For an employee who handled those files, the missing document and the decision to keep the account open belong in the same story. The agreement had arrived. The paperwork still had not.

The Senate Found Accounts Transferred Without Notice

The Senate Finance Committee’s investigation reported major violations of the earlier agreement, including nearly $100 million in family accounts transferred without notice to the Justice Department. It also reported 23 additional large undeclared accounts holding more than $20 million each.

For an insider, the transfer is a decision with a record behind it. The customer instruction, ownership information and bank’s disclosure history can connect the money leaving an account to the information the Justice Department received.

The Singapore Accounts Emerged After the Merger

The separate criminal non-prosecution agreement concerning Credit Suisse AG Singapore addressed another account population. The Justice Department described more than $2 billion in assets in Singapore accounts during the period from 2014 through June 2023. Its announcement said UBS identified apparently undeclared accounts after the merger, froze some, disclosed them and cooperated.

Records inherited from another institution can reveal accounts that earlier disclosures missed. Merger-review staff may know how those accounts came to light and what the institution did with them. Connecting those assets to unpaid tax requires the owner’s income and reporting history.

What Does a Swiss Bank Program Omitted Accounts Addendum Show?

A Swiss Bank Program omitted accounts addendum can identify accounts missing from the bank’s earlier disclosure. The supplemental agreements involving Lombard Odier, Bonhôte, Coutts and UBP show why the original account population needs a second look. Each belongs to its own criminal non-prosecution resolution.

The Justice Department announcements describe the additional accounts addressed by these supplemental agreements. Bonhôte, Coutts and UBP expressly acknowledged that accounts should have been disclosed when their original agreements were signed.

The Bonhôte announcement said:

An employee who reviewed the customer population may know which files were available at signing, which customers were classified as U.S.-related and what happened when an account did not make the disclosure. That knowledge connects the missing account to the decision that left it out.

The Bank Records That Explain the Missing Accounts

Useful bank records connect the customer the bank knew, the account it serviced and the information it disclosed. Banks and brokers create account-owner records, transaction histories and transmission records through their reporting work. Offshore reporting also depends on identifying beneficial owners and the information connecting an account to a U.S. person. Those records can explain why a customer disappeared from one account list while remaining visible elsewhere inside the institution.

The Customer File and the Tax Form

A beneficial-owner file identifies the person behind an account held in an entity’s name. A tax-compliance form records the identity and status used for tax reporting. In Credit Suisse AG’s earlier guilty plea, false beneficial-owner forms were part of the admitted concealment. In the later criminal case, the Justice Department described accounts serviced without tax-compliance documentation.

Someone who opened accounts, reviewed customer files or answered an internal tax inquiry may know how those records were produced. The valuable knowledge connects the discrepancy to a decision: who supplied the information, who questioned it and why the account continued to be serviced. We work with that account-specific knowledge when assessing the evidence behind a tax fraud claim.

The Transaction and the Disclosure

Transaction histories and authorization records connect account ownership to the movement of money. The fictitious donations described in the later Credit Suisse criminal case make that connection especially important. A transaction’s description is therefore part of the account history we examine, alongside the authorization and ownership records.

The same comparison applies when an account closes or moves. The Senate’s findings concerned transfers made without notice to the Justice Department, while the later Singapore account discovery arose from UBS’s review after the merger. For someone familiar with a transfer or review, the question is what those records disclosed about the customer and what information accompanied the bank’s account of the transaction.

What Reached the Reporting System

Bank transmission records can connect the internal account file to the information actually sent. Our page on FATCA, FBAR and Form 8938 follows the separate reporting records. Here, we examine what the bank knew, what it reported and what the customer’s tax records said about the same money.

Why Account-Level Evidence Matters After a Resolution

The IEB Report review Tax Evasion Through Offshore Accounts: a Review of the Empirical Evidence and Questions for Future Research explains why individual account records add something aggregate financial statistics cannot. It describes studies connecting customer information and disclosures to tax records to understand who held offshore wealth. Its distinction is blunt:

The review also describes evidence that early enforcement efforts prompted some offshore tax evaders to use anonymous holding companies or move assets to non-cooperating tax havens. That finding gives account histories and ownership changes a place beside the agreement itself. An insider can explain a change that an aggregate balance leaves invisible: the customer behind the account and the instructions behind the movement.

Can I File a Whistleblower Claim for Offshore Tax Evasion?

Yes, information about hidden offshore income and foreign-account reporting violations can support an IRS whistleblower award claim. We assess that connection with you, including what your records add about accounts omitted from an earlier disclosure or conduct that continued afterward.

The IRS award program handles federal tax information. The state tax False Claims Act route concerns a separate question where the evidence also involves state taxes. A whistleblower case under the False Claims Act can pay 15% to 30% of what the government recovers. We help determine which framework fits the tax conduct you know.

When You Know Which Accounts Were Left Out

If you worked on a bank’s disclosure, reviewed accounts after a merger or saw servicing continue without the required tax documents, speak with our tax whistleblower experts about what happened inside the bank. We build your case strategy around the accounts, the disclosure decisions and the tax revenue at stake, and bring in tax whistleblower lawyers who know offshore banking cases. We stay beside you from that first account discrepancy through the decisions ahead.