Start with the story, not the document checklist

Suppose a customer declares a net worth of S$10 million and says most of it came from running a private business. My first instinct would be to ask for several years of the company’s audited financial statements or profit and loss accounts. If the company has been making close to S$1 million in profits every year, particularly across the more recent years, that supports the explanation that the business was a major driver of the customer’s wealth.

We would still check the customer’s ownership share and how profits reached the customer through dividends or distributions, or contributed to the value of the business. Five years of S$1 million profits totals S$5 million, so the longer business history or other supported sources may also matter.

The numbers do not need to add up neatly to exactly S$10 million. People reinvest, spend, buy property, receive dividends and make other investments. SOW corroboration is not an accounting reconciliation exercise.

But if the same company has shown mediocre profits or losses for years, and the customer still says all S$10 million came from that business, then something is missing. That is where compliance should ask more questions.

A useful starting worksheet for source of wealth corroboration in Singapore could look like this. These are examples of different wealth sources and amounts, rather than components of one customer’s net worth. The source of wealth documents to request should depend on the customer’s story and risk. On a small screen, the table is displayed as labelled entries for each wealth source.

Wealth source Approximate amount Evidence to review Corroboration
Private business S$6m Audited financial statements, P&L statements, dividend records, corporate ownership records Has the business made enough profit over the last five or more years to make S$6m of wealth believable? Check the customer’s ownership share, dividends or distributions and the longer business history where relevant. The numbers do not need to match exactly. But if the business has been making losses or has only earned around S$1m in total over five years, we would need to understand how the customer reached S$6m.
Sale of a business S$6m Sale agreement, corporate records, bank receipt, tax or transaction documents Can we confirm that the business was actually sold and roughly how much the customer received? Check the customer’s ownership share and net proceeds after costs or debts. The amount received should broadly match the amount the customer says came from the sale.
Property S$2m Title deed, purchase agreement, sale agreement, property transaction records Check when the property was bought, how much it cost and, if it was sold, when and at what price. Compare the selling price with market values around the sale date. Separate the property’s value, the gain and the cash received after any mortgage repayment or costs.
Employment / salary savings S$1m Payslips, employment records, tax assessments Start with monthly salary × 12 × years worked, allowing for salary changes, taxes and normal spending. S$10,000 a month for ten years gives S$1.2m of gross income, so S$5m of savings would need another explanation. Review any investment growth separately.
Investment portfolio S$2m Brokerage statements, custody statements, portfolio history, transaction records Look at the amount originally invested and whether the account history shows a believable path to the current value. We do not need to check every trade if the overall portfolio history clearly shows how the wealth grew.
Salary savings + investments S$3m Employment income records together with brokerage or investment statements Salary alone may not explain the full amount, but savings invested over many years can grow significantly. Check whether the starting savings and investment returns together make the final amount believable. Very large gains should be supported by portfolio records.
Listed company shares S$20m Annual reports, exchange filings, shareholding disclosures Can public records confirm how many shares the customer owns? If yes, use the market price on the relevant date to estimate the value of the stake. Also understand how the customer acquired the shares and funded the purchase, or received them through the business, a gift or inheritance.
Inheritance S$5m Probate documents, will, estate distribution records, bank receipts Do the documents show that the customer was entitled to the inheritance and roughly how much was received? A clear probate or estate record can provide strong support. Consider the deceased person’s wealth and any unexplained risk in the inheritance, where relevant.
Gift S$2m Gift documentation, bank transfer, legal records where applicable Is there proof that the gift was actually made? We should also consider whether the person giving the money appears able to afford a gift of that size and whether there are any AML, sanctions or adverse-news concerns involving that person.
Cryptocurrency / digital assets S$5m Regulated exchange statements, transaction histories, wallet records, transfer records A S$5m wallet balance tells us what the crypto may be worth today, but not where it came from. Look for records showing how the customer first funded the account and how the holdings grew. Large unexplained transfers from other wallets may need more investigation.

The point of the worksheet is not to create a rigid checklist. It is to make the reviewer answer a simple question for every important source of wealth:

What evidence would make this story reasonably believable?

What source of wealth evidence actually proves

Different documents answer different questions. An ACRA record may prove that the customer owns a company. It does not prove that the company generated S$10 million of personal wealth.

A property title proves ownership. Public transaction records can help show what the property may be worth and when it was acquired.

A brokerage statement proves that an investment portfolio exists. A longer trading history may help show how that portfolio actually grew.

For listed companies, corroboration can sometimes be relatively straightforward. We have reviewed clients who were substantial shareholders or directors of public companies where the audited annual reports publicly showed their shareholdings. If someone owns 10% of a listed company and that stake is worth more than S$20 million, that can already explain a large part of the person’s wealth. We would still understand how the shares were acquired and any initial funding, with checks proportionate to the risk.

Private companies are harder because there may be much less public information. That is where audited accounts, P&L statements, dividend records or banking evidence become much more useful.

The question should always be:

What does this document actually prove?

Plausibility matters as much as paperwork

Suppose someone says:

I earned S$300,000 a year for 20 years and now have S$15 million.

Salary alone probably does not explain it. That does not mean the wealth is suspicious. It just means there is another part of the story.

Maybe the customer invested very successfully. Maybe property appreciation contributed substantially. Maybe there were large dividends or business interests. If the customer says investments were the main driver, we should be able to see enough portfolio history to show how the wealth broadly grew.

We had one client who was effectively a successful solo trader. He traded options from home and built his portfolio up to around S$5 million. It was an extremely high-risk way to invest, but that was not the compliance issue. The important part was that his brokerage history showed the initial deposits and the subsequent growth of the account.

We did not need to inspect every single options trade. The broad account history was enough to make the story credible. That is what a good SOW review should do. Find the evidence that explains the wealth without turning the exercise into a forensic audit.

Cryptocurrency is where traceability becomes much more important

We increasingly see customers trying to establish SOW by showing large Bitcoin or Ethereum holdings. A screenshot showing S$10 million of cryptocurrency may indicate a current balance. It does not establish the customer’s control of the wallet or where that S$10 million came from.

If the assets moved through private wallets, unregulated exchanges, mixing services or numerous transfers, it can become very difficult to establish how the initial capital entered the ecosystem and whether the customer genuinely traded his way to the current amount. We have rejected cryptocurrency holdings as the sole SOW evidence where there was simply no reliable way to trace the origin of the assets.

That does not mean cryptocurrency can never form part of SOW. A customer who can provide reliable exchange histories, wallet records and transfer evidence showing how the portfolio accumulated over time is in a much stronger position. Depending on the risk, checks may also cover wallet control, fiat deposits and withdrawals, and the source of incoming transfers, as discussed in ACIP’s source of wealth due diligence paper.

The difference is not whether the customer owns crypto. The difference is whether the wealth is traceable.

What if the client no longer has the old documents?

This is where compliance needs some judgement. Suppose someone sold a company in 2008 but no longer has every bank statement or transaction record. It is probably unreasonable to insist on documents that simply no longer exist.

We would first look for alternatives such as corporate records, sale documents, old banking evidence, public information, tax records or later investment records that support the story. MAS’s 2026 circular also supports considering reliable alternatives and reasonable, relevant benchmarks before requesting old records. A benchmark helps assess plausibility; it does not by itself prove that the customer earned or received the money.

If the entire explanation is:

I sold a private company twenty years ago and made S$8 million.

and there are no documents, no public records, no bank evidence and no other independent information, then we may simply be unable to rely on that event. The customer may need to establish his SOW using other sources that can actually be corroborated. The reviewer should document the evidence gaps, assumptions and remaining risk, including how any material unexplained source affects the decision.

The same principle applies to gifts. Saying “my father gave me S$5 million” is not enough. There should be some evidence that the transfer happened, and depending on the circumstances, the donor may also need to be screened and assessed. Otherwise we have merely moved the unexplained wealth one person backwards.

The real balancing act is compliance versus business

This is probably the part of SOW reviews that does not get discussed enough. Compliance wants to protect the institution. Business wants the client onboarded. The client wants to know why a financial institution suddenly wants his entire life story.

A junior compliance officer can easily solve the problem by asking for everything. Ten years of bank statements. Every old payslip. Every property document. Every trade statement. That may make compliance feel safer, but it is not necessarily better compliance.

The more useful skill is knowing which documents give you the clearest picture of the customer’s material wealth. That is also why MAS’s more recent risk-proportionate guidance matters. Compliance does not need 100% mathematical corroboration of every dollar. It needs enough reliable evidence to form a reasonable basis for accepting the customer’s SOW, with more scrutiny where the source is material or higher risk.

So before asking for another document, I would ask:

  1. What are the main sources of this customer’s wealth?
  2. Which ones actually account for most of it?
  3. What is the strongest document or independent source that could corroborate each material component?
  4. Does the overall story make financial sense?
  5. Is there still a real risk question left unanswered?

If the answer to the last question is no, asking for another five documents may not add much. Where red flags remain, the MAS 2026 circular calls for escalation to senior management, consideration of additional risk controls and close ongoing oversight if the relationship proceeds.

What should the final SOW conclusion say?

A good SOW write-up should allow someone who has never seen the file before to understand why compliance is comfortable. For example:

The customer has an estimated net worth of approximately S$10 million, primarily accumulated through ownership of ABC Pte Ltd. Corporate records confirm his ownership, while audited financial statements for the preceding five years show consistent profitability. Dividend records and evidence of the longer business history support the explanation that the business was the main contributor to his wealth. He also owns two Singapore properties, supported by title and publicly available transaction information, with related borrowing taken into account. The material sources reviewed broadly explain the declared net worth without double-counting business value and distributions. Based on the evidence reviewed and the absence of unresolved material red flags, the customer’s declared SOW is considered broadly plausible and sufficiently corroborated.

That is much more useful than writing:

SOW verified.

A good SOW review is not the one with the thickest file. It is the one where the customer’s wealth story makes sense, the important parts have been independently corroborated and the reviewer can clearly explain why the remaining risk is acceptable.

Need help reviewing difficult SOW cases?

Advisors Assemble helps financial institutions review complex source of wealth cases, improve SOW corroboration methodologies and strengthen AML/CFT onboarding controls. Our ongoing compliance support can assist with difficult customer cases, source of wealth evidence standards, internal SOW frameworks and practical approaches to balancing regulatory expectations with workable onboarding.

For relevant AML/CFT support, see our DPT compliance services and fund manager compliance services. You can also review our Services & Fees or contact Jackie to discuss how to verify source of wealth in a difficult case.

Important: This guide provides general regulatory information and does not constitute advice on a particular customer relationship. The appropriate level of SOW due diligence depends on the customer, the institution’s risk assessment, applicable MAS requirements and the circumstances of the relationship.

Reviewed on 13 October 2026.