What each term usually means
Source of wealth (SOW) asks: how did your overall assets accumulate over time?
It looks at the longer story — career, business, investments, inheritance, property, and other legitimate origins of what you hold today.
Source of funds (SOF) asks: where did the money for this specific payment or investment come from, and what activity produced it?
It focuses on the cash (or assets) used for a particular contribution, subscription or transfer — and the path those funds took into the account that pays.
A useful shorthand: wealth is the history; funds are the transaction. Reviewers often want both so the story of who you are financially matches the story of the money moving now.
