Know-your-customer (KYC) and customer due diligence (CDD) are essential components of a compliant anti-money laundering strategy. Together, they provide the information businesses need to make accurate anti-money laundering (AML) risk assessments and comply with AML reporting requirements.
Collecting identifying information and verifying customer identities are the foundation of KYC and CDD. However, financial institutions and other businesses subject to AML regulations may need to dig deeper into some customers’ financial histories to accurately assess risk.
Source of funds (SOF) and source of wealth (SOW) are among the most valuable checks for determining risk. They help regulated organizations better understand the risk profile presented by transactions and customers; they play a pivotal role in enhanced due diligence checks.
In this article, we’ll take a closer look at what SOF and SOW are, why they matter, and the circumstances in which they are required.
Key Highlights
- Source of funds (SOF) answers a narrow question: where did the money used in this specific transaction come from? Source of wealth (SOW) answers a broader one: how did this customer accumulate their overall net worth?
- Section 312 of the USA PATRIOT Act specifically requires U.S. financial institutions to determine the source of funds deposited into private banking accounts, which the regulation defines as accounts requiring a minimum aggregate deposit of $1 million or more for a non-U.S. person.
- Section 312 also requires enhanced scrutiny, including SOW checks, for private banking accounts held by senior foreign political figures, a category that overlaps closely with what FATF and most AML programs refer to as politically exposed persons (PEPs).
- FATF’s Recommendations call for verifying source of wealth as part of enhanced due diligence for PEPs and other higher-risk customers, not just as a US-specific requirement.
- SOF verification typically relies on transaction-specific documents (bank statements, pay slips, sale agreements), while SOW verification draws on a broader set of records (tax returns, business filings, investment statements) built up over a customer’s financial history.
- Red flags such as vague or shifting explanations, reluctance to provide documentation, and wealth concentrated in cash-intensive businesses or high-risk jurisdictions should prompt deeper SOF or SOW review even outside the customers where it’s strictly mandatory.
What is Source of Funds (SOF)?
Source of Funds (SOF) is the origin of the money involved in a transaction. It is the specific activity or event that generates the money a customer uses to conduct a transaction. Understanding the SOF enables financial institutions and other regulated entities to ensure that the funds do not result from illegal activity.
When a customer deposits a large sum of money, makes a significant investment, or purchases a high-value asset, the institution handling the transaction should verify the SOF. To do so, they ask the customer to provide evidence, such as bank statements, pay slips, or documents confirming the sale of an asset, that shows the funds come from a legitimate source.
Let’s say a customer wants to invest a large amount of money into a mutual fund. The financial institution managing the investment will need to check the SOF. They will ask the customer for proof, like bank statements or documents that show where the money came from, whether that’s the customer’s salary, a business sale, or a gift from a family member.
If the funds come from the customer’s business, the institution might ask for business financial statements or records of recent transactions showing the money was earned legally. If the money was a gift, the customer might need to provide a letter from the person who gave it.
Verifying the SOF aids in detecting, preventing, and reporting suspected money laundering. Money launderers often try to introduce their illicit funds into the financial system by disguising their origins in a process known as layering, which is the second stage of money laundering. As a result, verifying the SOF is a key process for detecting and preventing money laundering.
What is Source of Wealth (SOW)?
Source of Wealth (SOW) is about understanding a customer’s overall financial status. It looks at how customers accumulated their total wealth over time, including their past earnings, investments, inheritance, and any business dealings that have contributed to their current wealth.
For example, if a customer has a high net worth and wants to open a private banking account, the bank will look into the SOW. They might ask about the customer’s employment history, business ownership records, or inheritance documents. The goal is to build a profile showing the customer’s legitimate wealth.
Consider a customer with a net worth of several million dollars. The SOW check might reveal that the wealth was accumulated through a successful career as an executive, savvy stock market investments, and a substantial inheritance. The bank would then verify this information through employment records, investment statements, and inheritance paperwork.
Understanding SOW helps banks and businesses manage risk by ensuring their clients have lawfully acquired their wealth. It’s a vital part of due diligence, especially for high-net-worth individuals or those involved in complex financial transactions. By verifying SOW, institutions protect themselves from being used as a vehicle for financial crimes like money laundering or fraud.
Source of Funds vs. Source of Wealth
SOF and SOW help businesses understand the risk a customer or transaction presents, but they serve different purposes and address different questions.
SOF concerns the origin of the specific money used in a transaction. It answers the question, “Where did this money come from?”
In contrast, SOW deals with the broader question of how a customer accumulated their wealth. It answers the question, “How did this customer become wealthy?” SOW checks look at the customer’s financial history, including their career, business activities, investments, and other significant events that have contributed to their wealth over time.
The key differences between SOF and SOW can be summarized as follows:
- Scope: SOF is transaction-specific, while SOW is about the customer’s entire wealth.
- Purpose: SOF checks ensure that the funds for a particular transaction are not linked to illegal activities. SOW checks help to build a profile of the customer’s financial history and ensure their wealth is consistent with their background and income sources.
- Documentation: SOF verification might require bank statements, payment receipts, or loan agreements related to the transaction. SOW verification might require a broader range of documents, such as tax returns, business records, or proof of investment returns, to paint a picture of the customer’s financial journey.
Why Do SOF and SOW Matter?
In the United States, SOF checks are specifically required by Section 312 of the USA PATRIOT Act for private banking accounts, defined under the regulation as accounts requiring a minimum aggregate deposit of $1 million or more for the benefit of a non-U.S. person. Institutions maintaining these accounts must take reasonable steps to determine the source of funds deposited into them, and must apply enhanced scrutiny to accounts held by senior foreign political figures specifically, a category that closely overlaps with what most AML programs refer to as Politically Exposed Persons (PEPs), individuals who are or have been entrusted with prominent public functions and may represent higher risks due to their position and the potential for corruption.
Enhanced due diligence (EDD) is required for these customers and others where a preliminary risk assessment suggests a higher risk of money laundering or terrorist financing. EDD is a more thorough process of investigation that goes beyond standard identity verification and KYC processes. It involves a deeper examination of a customer’s background, financial activities, and the risks they may pose.
It includes SOF and SOW checks to ensure the business fully understands the nature of the customer’s transactions and wealth and detects any potential red flags indicating illicit activities.
Additionally, collecting and verifying SOF and SOW is part of the Financial Action Task Force’s recommendations for combating anti-money laundering and terrorist financing, meaning this expectation extends well beyond U.S.-regulated institutions to any business operating under a FATF member country’s AML framework.
Common SOF and SOW Red Flags
Not every customer needs a full SOF or SOW review, but certain patterns should prompt a closer look even when a formal EDD trigger, such as a Section 312 private banking account or a PEP relationship, isn’t clearly present. Common red flags include:
- Explanations for the source of funds or wealth that are vague, inconsistent, or change over the course of the relationship
- Reluctance or refusal to provide supporting documentation, or documentation that appears altered or inconsistent with other records on file
- Wealth or income that is disproportionate to the customer’s stated occupation, employer, or business activity
- Funds originating from, or wealth concentrated in, jurisdictions with weak AML/CFT frameworks or known for high levels of corruption
- Reliance on cash-intensive businesses, shell companies, or complex ownership structures to explain the source of wealth
- Third parties, rather than the customer, providing or controlling the documentation used to support SOF or SOW
When these patterns appear, escalating to a full SOF or SOW review, even for a customer who wouldn’t otherwise require one, is a reasonable and defensible risk-based decision.
SOW and SOF Checks with Alessa
Alessa is a modular anti-money laundering software platform with comprehensive customer due diligence and enhanced due diligence features, including SOW and SOF information gathering and verification.
Contact our AML experts today to learn how Alessa can streamline and optimize your business’s AML compliance processes.
