What is Source of Wealth (SoW)?
Last updated: 23 October 2026
What Is Source of Wealth?
Source of wealth (SoW) is the origin of a customer’s total assets and net worth, meaning how they built or acquired their wealth over time. Financial institutions establish and verify it as part of enhanced due diligence (EDD) to check that a customer’s wealth is plausible and comes from legitimate activity. It is one of the main ways to identify money laundering and corruption risk in higher-risk relationships.
What is the difference between source of wealth and source of funds?
Firms usually need both for higher-risk customers, and the two should be consistent with each other.
When is source of wealth required?
- For politically exposed persons. The FATF standards call for reasonable measures to establish both source of wealth and source of funds.
- In private banking and for high-net-worth customers
- For customers in or connected to higher-risk jurisdictions
- Where ownership is complex or opaque, as in UBO structures
- Where activity or adverse media raises concern
- Where a customer’s risk rating is high
What are common sources of wealth?
Typical examples include employment income, business ownership or sale, inheritance, investment gains, property sales, gifts and legal settlements.
What evidence verifies source of wealth?
Evidence should corroborate the customer’s explanation and, where possible, come from independent sources. Examples include:
- Sale agreements and completion statements
- Audited company accounts and tax returns
- Payslips and employment contracts
- Probate or inheritance documents
- Bank and investment statements
- Public records, company registries and reputable media
How do you establish source of wealth?
To establish source of wealth, it is easiest to follow a basic list:
- Collect a declaration from the customer, with enough detail to be tested.
- Corroborate it with documents and independent sources.
- Check that the explanation is plausible against the customer’s known income, profession and profile.
- Screen for adverse media and sanctions exposure for the customer and related parties.
- Record the rationale for the decision and obtain senior management approval where required.
- Refresh when risk changes, supported by ongoing due diligence.
What are the red flags?
- Wealth that does not fit the customer’s known income or profession
- Vague, inconsistent or changing explanations
- Reluctance to provide evidence
- Wealth linked to high-risk sectors or jurisdictions
- Funding from unexplained third parties
- Rapid, unexplained growth in assets
What are the challenges?
Verification is often manual and slow, documents can be hard to authenticate, cross-border evidence is difficult to obtain, and deciding whether an explanation is plausible takes judgment. Inconsistent standards between analysts create audit risk.
How does AI support source of wealth checks?
AI can pull together information from registries, filings and media, summarize it and compare it with the customer’s profile. Agentic AI can assemble the evidence for an analyst to review, while keeping a full audit trail. See how SymphonyAI KYC and CDD software supports this.
FAQs
Is source of wealth the same as source of funds?
No. Source of wealth explains how all of a customer’s wealth was built, and source of funds explains where the money for a particular transaction came from.
Who needs a source of wealth check?
Mainly higher-risk customers, such as PEPs and high-net-worth clients, though risk-based policies vary between firms.
What if a customer cannot provide evidence?
The firm should assess whether other evidence supports the explanation. If it can’t establish the source, it may need to decline or exit the relationship and consider a SAR.
For more, see customer due diligence (CDD) and KYC.