Source of wealth evidence: what documents prove how wealth was built

What source of wealth means

Source of wealth describes the economic activity that generated a person's total net worth. It is about the person, usually a beneficial owner, settlor or major shareholder, and it looks backwards over their life and career.

It is often confused with source of funds, which looks at the specific money moving through an account. The two are related but answer different questions. If a family office in the Isle of Man sends EUR 2 million to buy a property in Portugal, source of funds asks where that EUR 2 million came from. Source of wealth asks how the family accumulated the wealth that the office manages in the first place. Our companion guide on source of funds evidence covers the transactional side.

Regulated firms are expected to take reasonable, risk-based steps to establish source of wealth where the risk calls for it. In practice, for anyone using a structure in an international financial centre, a provider will usually want at least a written explanation and some supporting evidence.

How to set out the narrative

Start with a short written statement, typically one to two pages, signed by the individual or prepared by their adviser. It should cover:

• Education and career history in outline, with dates.
• The main wealth-generating events: businesses founded or sold, significant inheritances, investment successes, property transactions.
• Approximate values at each stage, and approximate current net worth broken down by asset type.
• How the wealth is held now, including any trusts, holding companies or family office arrangements.

The statement does not need to be polished. It needs to be specific enough that each claim can be matched to evidence. "Built up a manufacturing business over 20 years and sold it in 2019" is better than "successful entrepreneur". "Sold 100 per cent of the shares in a packaging manufacturer to a trade buyer for approximately EUR 30 million, with net proceeds after tax of approximately EUR 22 million" is better again.

Then attach evidence for the significant events. The analyst will judge whether the evidence supports the total. Gaps are fine if they are small relative to the whole and explained; unexplained gaps in the largest components are what cause problems.

Sale of a business

Business sales are one of the most common sources of significant wealth and one of the easiest to evidence well, because the transaction leaves a paper trail. Useful documents include:

• The share purchase agreement or asset purchase agreement, or a certified extract showing the parties, date and consideration.
• A completion statement or closing memorandum.
• A bank statement showing receipt of the proceeds into the seller's account.
• Public announcements or press coverage of the sale, where it was publicly reported.
• A letter from the lawyer or accountant who acted on the sale, confirming the key facts.
• Tax filings showing the capital gain, where relevant.

Where consideration was paid partly in shares of the buyer, or in instalments, or through an earn-out, explain this and evidence each element. Providers sometimes see a headline price in the press that does not match the money actually received, and an explanation in advance prevents a query.

The provider may also want some evidence of how the business was built, for example historic accounts showing its growth. For a business sold many years ago, a brief summary is usually enough.

Inheritance and gifts

For inherited wealth, the provider needs to establish that the inheritance happened and roughly what it was worth, and may want a short account of how the deceased built their own wealth. Typical evidence:

• A grant of probate, letters of administration or the equivalent in the relevant country.
• The will, or the relevant extract identifying the bequest.
• Estate accounts showing distributions to the beneficiary.
• A letter from the estate's lawyer or executor confirming the amount received.
• Bank statements showing receipt of the inheritance.

Where the inheritance is old, or came from a jurisdiction where formal probate documents are not routinely produced, a solicitor's letter summarising the position is often acceptable. For lifetime gifts, a deed of gift or a signed letter from the donor plus evidence of the transfer, and a brief account of the donor's own source of wealth, are the usual starting points.

Wealth that has passed through several generations and is held in family trusts can be evidenced at the level of the trust: the trustee's confirmation of the trust's history and assets, supported by trust accounts. Our page on trusts describes how providers usually approach these structures.

Salary, bonuses and professional income

Employment income is straightforward to evidence but rarely explains large wealth on its own. A senior executive may have accumulated meaningful savings, but the provider will compare the claimed wealth with a realistic picture of earnings over the career. Useful documents:

• Recent payslips or an employment contract showing salary.
• Tax returns or tax assessments for several years.
• Bonus letters, share plan statements or option exercise confirmations.
• A letter from the employer confirming position, length of service and remuneration.
• For partners in professional firms, partnership profit statements or tax returns showing partnership income.

Equity compensation often accounts for the large numbers. A technology executive whose wealth came mainly from shares vesting at an initial public offering should evidence the share awards, the vesting and the sale proceeds, rather than relying on salary history.

Investment returns and property

Investments. Where wealth has grown through investment, providers usually want brokerage or portfolio statements showing holdings and performance over time, plus evidence of where the original capital came from. Long-held portfolios can be evidenced with a current statement and a few historic ones at intervals, together with a letter from the investment manager. Concentrated gains from a single investment, such as an early stake in a private company, are best evidenced like a business sale.

Property. For property wealth, the useful documents are title deeds or land registry extracts, purchase and sale completion statements, mortgage statements, rental income records and tax filings. A recent valuation helps where the provider needs to understand current net worth. For a developer or landlord with many properties, a schedule of the portfolio with acquisition dates, costs, current values and any debt is far more useful to the analyst than fifty separate deeds.

In both cases, the provider wants to see how the starting capital was obtained. "Bought my first rental flat in 2004 with savings from employment, then refinanced to acquire further units" connects the property story back to an evidenced source.

Gains from digital assets

Wealth from digital assets is now common and providers have become more practised at assessing it, but it does require care. The usual difficulty is practical: the evidence trail can be fragmented across exchanges, wallets and years, and some early platforms no longer exist.

Helpful evidence includes:

• Exchange account statements or trade histories showing purchases, sales and withdrawals.
• Evidence of the fiat used for the original purchases, such as bank statements showing transfers to an exchange.
• Wallet addresses used, so the provider can carry out on-chain analysis.
• Tax filings or a report from a specialist crypto tax adviser reconciling acquisitions, disposals and gains.
• For mining or validator income, records of hardware or infrastructure, and payout histories.
• For tokens received in a project's early distribution, documents showing the person's role or investment.

Expect on-chain screening of the wallets concerned. If any funds have passed through high-risk services in the past, it is better to explain that upfront than to have it found. Our Digital asset conversion page gives further background.

Proportionality: how much is enough

Providers apply a risk-based approach, so the depth of evidence varies. Factors that usually increase the depth required:

• Large expected account activity relative to the stated wealth.
• Politically exposed persons and their family members or close associates. See our guide to politically exposed persons.
• Wealth originating in high-risk jurisdictions or sectors.
• Complex or layered structures.
• Adverse media about the individual or their businesses.

Factors that may reduce it include a straightforward structure, modest expected activity, wealth that is already well documented in public sources, and an introduction from a regulated professional who has carried out their own checks.

Illustrative example: a Cook Islands trust with assets of around EUR 15 million, settled by a retired founder who sold a well-known business, with expected flows of a few payments a year. A signed narrative, the sale agreement extract, a bank statement showing receipt of proceeds and trust accounts may be sufficient. The same founder setting up a structure to receive large monthly flows from new ventures would face further questions about those ventures.

Presenting the evidence pack

How the evidence is organised affects how quickly it is reviewed. A pack that an analyst can follow from start to finish without writing back is the aim. A few practical points:

• Number the evidence and refer to it in the narrative. "Sale of shares in 2019 (see documents 4 to 7)" lets the analyst jump straight to the proof for each claim.
• Redact sensitively. It is usually acceptable to redact unrelated transactions on a bank statement or personal details of other parties in a sale agreement, as long as the parts that matter remain visible. Explain what has been redacted and why.
• Translate the key passages of documents in other languages. A full certified translation of a long sale agreement is rarely needed; a translated extract of the parties, date and price, with the original attached, often is enough.
• Reconcile the numbers. If the narrative says net worth is around EUR 40 million, the components should add up to roughly that figure, with an honest line for anything not separately evidenced.
• Keep it for next time. Source of wealth rarely changes dramatically between reviews. A well-built pack can be updated with new events rather than rebuilt from scratch.

Before you act

This guide is general information. It does not constitute legal, tax or financial advice, and the evidence a provider asks for depends on its own risk assessment. Where wealth has a complicated history, it is worth having an accountant or lawyer prepare the narrative and assemble the evidence before you apply.

If you are opening an account for a family office, trust or holding structure with CCYFX, our family offices page and the onboarding checklist builder explain what we usually need.