Source of wealth explains how the customer's overall assets were accumulated; source of funds explains the money used for a particular investment or transfer. Regulation 35 requires adequate measures for both in PEP relationships, and other higher-risk cases may require them under the applicable EDD framework.
Evidence should be tailored to the explanation: for example business ownership and sale documents, income or inheritance records and supporting financial information. A bank statement can show a transfer without establishing the underlying origin of the wealth.
Practical application
Test the plausibility of the narrative against independent evidence and resolve material inconsistencies. Record why the evidence is sufficient for the assessed risk.