Source of Wealth (SOW): What Law Firms Need to Know

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If there’s one area of AML that tends to get misunderstood or quietly brushed over it’s Source of Wealth. Not because firms don’t care, but because it sits in that slightly grey space between what feels necessary and what feels excessive. It’s easy to focus on the transaction in front of you, especially when things appear straightforward on the surface. But Source of Wealth isn’t really about the transaction. It’s about the bigger picture behind it.

It’s part of how you assess the nature and purpose of your relationship with the client, one of the key things you need to establish during initial CDD.

At its simplest, it’s asking a reasonable question: how did this person build their wealth over time? That’s it; but like most things in AML, the simplicity of the question doesn’t always translate into a simple answer.

What tends to happen in practice is that Source of Funds gets the attention because it feels more immediate. There’s a transaction happening, money is moving, and naturally that becomes the focus. But Source of Wealth is what gives that transaction context. Without it, you’re only ever looking at part of the story.

And sometimes, that part looks perfectly fine. That’s the risk. Because funds can appear clean, consistent, and well-documented in isolation, but when you take a step back and look at the broader picture, things don’t always align as neatly as they should.

Most clients will fall into familiar categories. Employment income, property sales, business profits, investments, inheritance, none of this is unusual. In many cases, the explanation will be entirely legitimate and easy to follow. You might see payslips or employer confirmation for income, contracts and settlement statements for property sales, accounts or tax returns for business profits, or estate documentation in the case of inheritance.

It’s not about overcomplicating it or asking for everything under the sun. It’s about having enough information to support the story you’ve been given. And that’s where the shift needs to happen. Because Source of Wealth isn’t about collecting documents. It’s about understanding whether the explanation you’ve been given makes sense in the context of the client, the transaction, and what you know about them more broadly.

That might mean pausing for a moment and asking yourself whether the level of wealth being described is consistent with the information you’ve been provided. It might mean going one layer deeper if something doesn’t quite add up. Not in an aggressive or intrusive way, but in a way that reflects a genuine attempt to understand what’s going on.

Where firms tend to get caught out is when this becomes a checklist exercise.

Something gets noted. A document gets uploaded. A box gets ticked.

And then everyone moves on.

But AML doesn’t really work like that.

Having something on file isn’t the same as having properly considered it. And if you haven’t really thought about it, it’s very difficult to demonstrate that you’ve assessed the risk in any meaningful way.

This becomes more obvious in the slightly less straightforward scenarios. Gifts, for example, often get accepted at face value, but they raise an obvious follow-up question — where did the donor’s wealth come from? Loans are another common one. It’s not enough to know that funds have been borrowed; you need to understand whether there’s a legitimate facility in place and whether it aligns with the overall picture. Even something like a gambling win, which might sound plausible, still requires evidence if it’s being relied on as a source of wealth.

None of this is about being overly sceptical or creating friction with clients. It’s about applying a level of professional curiosity that’s proportionate to the situation you’re dealing with.

And importantly, it’s about being able to explain your thinking.

Because if you ever must justify your approach, the question won’t be whether you collected a document or asked a question. It will be whether you understood the explanation and whether your decision to proceed was reasonable in the circumstances.

That’s where Source of Wealth really comes into its own.

It’s the point where AML moves away from being purely process-driven and becomes something that relies on judgement. Not guesswork, not instinct, but informed, consistent judgement that’s grounded in what you’ve seen and what you’ve been told.

That does require a level of confidence, particularly in knowing when to ask a bit more, when something is sufficient, and when something doesn’t feel quite right. It also requires consistency across your firm, so that similar situations are approached in a similar way, rather than depending on who happens to be handling the matter.

With the upcoming AML changes in Australia, this is only going to become more relevant. Firms are moving into a space where it’s not enough to say that checks have been done. There needs to be a clear understanding of what those checks involved and what conclusions were reached as a result.

Source of Wealth sits right at the centre of that. It’s not about turning every matter into an investigation. It’s about being comfortable that the explanation you’ve been given holds together, and that you’ve taken reasonable steps to satisfy yourself of that before proceeding.

If that thinking isn’t there, no amount of paperwork will really fill the gap. And if it is there, the process becomes far more straightforward. If you want to get a clearer sense of how this works in practice, we run regular AML masterclasses where we walk through real examples and show how to approach this without overcomplicating it.

You can take a look and book a place here: https://www.eventbrite.com.au/o/aml-sorted-105692165241\

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