Casino KYC vs Source of Funds vs Source of Wealth: What’s the Difference?

KYC, Source of Funds and Source of Wealth Explained

KYC, Source of Funds and Source of Wealth often appear together in casino verification discussions, but they answer different questions.

The simplest way to separate them is:

• KYC: Who are you?
• Source of Funds: Where did the money being used come from?
• Source of Wealth: How was your wider wealth built?

The checks can overlap because the same financial information may help an operator understand more than one part of the customer's profile.

However, they should not be treated as interchangeable labels.

What Is Casino KYC?

KYC — Know Your Customer — is the broad process of identifying and understanding the customer.

For remote gambling, UKGC Licence Condition 17.1.1 requires operators to obtain and verify identity information before allowing a customer to gamble.

At minimum, that includes:

• name
• address
• date of birth

The operator must also take reasonable steps to keep identity information accurate.

KYC can therefore involve identity documents or electronic checks, but the concept is broader than simply uploading a passport.

For the full process, see How Casino Verification & KYC Really Works .

UKGC guidance makes clear that remote operators must verify core identity information before gambling starts.

What Is Source of Funds?

Source of Funds — often shortened to SOF — asks where the money used for a transaction or gambling activity came from.

The UK Gambling Commission defines Source of Funds as: the source from which the funds, money or cash used to finance the transaction originated.

Examples could include:

• salary or employment income
• self-employed income
• savings
• investment proceeds
• sale of an asset
• inheritance
• a business payment

The important point is that Source of Funds focuses on the money being used, rather than every asset the customer owns.

UKGC guidance says casinos should carry out ongoing monitoring and, where necessary, examine Source of Funds to make sure transactions are consistent with what they know about the customer and the customer's risk profile.

Regular or higher-risk activity may therefore require more information than was needed at initial identity verification.

What Is Source of Wealth?

Source of Wealth — SOW — is broader.

The Gambling Commission defines it as the origin of the customer's overall body of wealth or total assets, including how that wealth was acquired.

For example, Source of Wealth might involve understanding whether a person's overall financial position resulted mainly from:

• long-term employment
• business ownership
• investments
• property ownership
• inheritance
• other accumulated assets

A Source of Wealth check is therefore not simply asking: “Where did this £1,000 deposit come from?”

It is closer to asking: “How does the customer's overall financial position make sense?”

Source of Wealth checks are particularly relevant in higher-risk situations. For example, UKGC guidance states that casinos must take adequate measures to establish Source of Wealth and Source of Funds for Politically Exposed Persons, and there are additional obligations in other higher-risk cases.

What Documents Might Be Relevant?

There is no single document that proves every type of financial background.

The information required depends on what the operator is trying to establish.

KYC documents

These may include documents or electronic data used to confirm identity, such as:

• passport
• driving licence
• address evidence
• electronic identity-verification records

Source of Funds evidence

Depending on the circumstances, relevant evidence could include:

• bank statements
• payslips
• employment information
• evidence of a sale
• investment or savings records

Source of Wealth evidence

Because Source of Wealth concerns a wider financial picture, the evidence may need to explain the origin of accumulated assets rather than only one transaction.

The UKGC consumer guidance specifically notes that gambling businesses may ask for bank statements to assess whether Source of Funds is legitimate and may also look at income patterns.

When Can These Checks Happen?

KYC should not be thought of as one single check that happens once and is then finished forever.

Identity verification happens at the beginning of the customer relationship, but operators also have ongoing monitoring obligations.

A customer initially considered lower risk may later display activity that changes the operator's risk assessment.

That can result in enhanced customer due diligence or additional Source of Funds or Source of Wealth enquiries.

UKGC guidance specifically says operators should monitor accounts on an ongoing, risk-sensitive basis and obtain Source of Wealth and/or Source of Funds information where necessary and proportionate to the risks posed.

Can a Casino Ask for Source of Funds at Withdrawal?

Potentially — but timing matters.

UKGC Licence Condition 17.1.1 says a withdrawal request must not trigger an additional information requirement where the operator could reasonably have requested that information earlier.

However, the rule also recognises that an operator may need additional information at that point because of another legal obligation.

The Gambling Commission has repeatedly stressed that operators should not continue accepting deposits indefinitely and then rely on AML procedures to obstruct a withdrawal where the relevant information should have been sought earlier.

That means the correct question is not simply: “Can they ask for Source of Funds?”

It is: “Why is the information needed now, and could the operator reasonably have asked for it earlier?”

See Casino Withdrawal Pending: What Does It Actually Mean? for the withdrawal-specific rules.

This distinction is directly supported by current UKGC rules and withdrawal guidance.

The A2Z KYC / SOF / SOW Framework

A2Z separates these checks into three layers:

1. Identity — KYC
   Is the operator satisfied that the customer is who they say they are?
2. Transaction money — Source of Funds
   Does the operator understand where the money used for gambling came from?
3. Overall financial position — Source of Wealth
   Where the risk level requires it, does the customer's wider wealth make sense in light of what the operator knows?

Keeping these concepts separate makes it easier to understand why one customer may only complete identity verification while another is asked for additional financial information.

It also prevents every financial check from being described loosely as “KYC”.