The difference between SoF and SoW
Source of funds (SoF) and source of wealth (SoW) are related but distinct compliance concepts. SoF refers to the origin of the *specific* money being used for a transaction or to fund a new account. For example, if you are depositing £100,000, the SoF is the history of that particular sum. Did it come from a client payment, the sale of a property, or a transfer from another corporate account? You prove this with invoices, sale agreements, or bank statements showing the inbound credit and subsequent debit.
Source of wealth (SoW) is a broader concept. It explains how you, the ultimate beneficial owner (UBO), accumulated your *total* net worth. It is the story of your entire financial journey. Did your wealth come from building and selling a previous company, from years of salaried employment and stock options, from inheritance, or from successful crypto investments? SoW documentation is more narrative, supported by evidence like tax returns over many years, audited company financial statements showing retained profits, or probate documents. Banks for high-risk industries care deeply about both, but SoW is often the bigger hurdle for founders with complex international histories.