Anti-Money Laundering
Anti-Money Laundering (AML) refers to the body of laws, regulations, and procedures that financial institutions must maintain to detect, prevent, and report the laundering of illegally obtained funds through the financial system.
Money laundering is the process of disguising the illicit origin of criminal proceeds — typically from drug trafficking, fraud, corruption, tax evasion, or terrorism financing — by moving funds through layered financial transactions that make dirty money appear legitimate. The U.S. AML framework is built on a foundation laid by the Bank Secrecy Act of 1970 (BSA), which first required financial institutions to maintain records and file reports to help government agencies detect and prevent money laundering and other financial crimes.
The primary U.S. AML regulator is the Financial Crimes Enforcement Network (FinCEN), a bureau of the Treasury Department. FinCEN collects and analyzes financial intelligence from the mandatory reports that banks and other financial institutions file — primarily Currency Transaction Reports (CTRs) for cash transactions above $10,000 and Suspicious Activity Reports (SARs) for transactions that appear to involve money laundering, fraud, or other criminal activity. Banks file hundreds of thousands of SARs annually, and law enforcement agencies use this data to build financial crime investigations.
The USA PATRIOT Act of 2001 significantly expanded AML obligations, requiring all financial institutions to establish formal AML compliance programs with four key pillars: internal policies, procedures, and controls; a designated compliance officer; ongoing employee training; and independent testing of the AML program. The Anti-Money Laundering Act of 2020 modernized the framework further, introduced beneficial ownership reporting requirements through the Corporate Transparency Act, and enhanced penalties for compliance failures.
AML compliance is one of the most resource-intensive regulatory obligations for banks. Major institutions employ thousands of compliance staff and spend hundreds of millions of dollars annually on transaction monitoring systems, investigations, and regulatory reporting. Failures in AML compliance have resulted in some of the largest financial penalties in banking history — including multi-billion-dollar settlements for HSBC, Deutsche Bank, and other global institutions.
For investors in financial institutions, AML compliance risk is a significant ongoing consideration, as enforcement actions can result in deferred prosecution agreements, profit disgorgement, and operational restrictions.