Source of funds
This money
Where did the specific money being used for gambling or a transaction come from, and how did it reach the operator?
Example
Salary → bank account → gambling deposit
Think about the origin and route of the particular funds.
Compare · SOF vs SOW
The phrases sound similar, but they are not asking the same question. Source of funds follows particular money. Source of wealth looks at the wider financial story behind the person using it.
Source of funds
Where did the specific money being used for gambling or a transaction come from, and how did it reach the operator?
Example
Salary → bank account → gambling deposit
Think about the origin and route of the particular funds.
Source of wealth
How did the person build the wider assets, income or net worth that sit behind their current financial position?
Example
Career + business + property + investments
Think about whether the overall financial position makes sense in context.
Quick comparison
Common misunderstandings
That tells the operator where the money was held. It does not necessarily explain where the money originally came from.
Income can be part of the picture, but salary alone may not explain a much larger overall level of wealth.
A document helps only if it supports the explanation the operator is trying to verify.