Source of wealth explains how you built your overall wealth; source of funds explains where the specific money in one transfer came from. On a large or higher-risk transfer, a UK bank or broker may ask for both — and source of wealth is usually the harder one to evidence, and the one that most often causes delays.
This guide explains what source of wealth means, how it differs from source of funds, when you will be asked for it, and the documents that satisfy the check — so a large payment clears without avoidable hold-ups.
What is source of wealth?
Source of wealth is the origin of your entire body of wealth — the accumulated assets you hold and the activities and events that generated them over time, such as a career, a business sale, an inheritance, property, or investment returns.
It is a wider picture than any single payment. Where source of funds looks at one transaction, source of wealth asks how you came to have money in the first place. A firm carrying out enhanced checks wants to see that your overall wealth has a legitimate, explainable origin that is consistent with what it already knows about you.
The concept is written into UK law. Under the Money Laundering Regulations 2017, firms dealing with politically exposed persons must “take adequate measures to establish the source of wealth and source of funds” involved in the relationship (regulation 35). Industry guidance from the Joint Money Laundering Steering Group (JMLSG) applies the same distinction more widely.
What is the difference between source of wealth and source of funds?
Source of funds is the origin of the specific money used in a single transaction — for example, the UK account it is paid from and the event that produced it, such as a property sale or a pension lump sum. Source of wealth is the origin of your total wealth across your life, not just the money in front of the firm today.
The two overlap but are not the same. You can evidence source of funds for one payment — here is the completion statement from my house sale — while a firm still asks about source of wealth: how did you come to own that house, and the rest of your assets? The table below sets out the practical difference.
| Source of funds | Source of wealth | |
|---|---|---|
| Question it answers | Where did the money in this transfer come from? | How was your overall wealth built up? |
| Scope | One transaction | Your entire financial position |
| Typical evidence | Completion statement, sale contract, payslip, dividend voucher, the account showing the funds | Employment history, business accounts, inheritance papers, investment statements, property records over time |
| When it is asked | Most transfers above a firm’s threshold | Larger or higher-risk transfers, PEPs, or where funds look inconsistent with the customer |
| Difficulty | Usually straightforward | More involved — it can span years |
When will you be asked for source of wealth?
Checks are risk-based, not a fixed pound figure. A firm decides how much to ask for by weighing the size of the transfer, the currencies and countries involved, and how well the payment fits what it already knows about you.
Source of wealth is most likely to come up in a few situations. The Money Laundering Regulations 2017 require enhanced due diligence in higher-risk cases — which the rules say include transactions that are complex or unusually large, or that have no apparent economic or legal purpose (regulation 33). In practice, source of wealth tends to be requested when:
- you are making a large one-off transfer, such as the proceeds of a property sale or a business exit;
- the payment is linked to a high-risk third country on the UK government’s list, which triggers enhanced checks automatically;
- you are a politically exposed person, or their family member or close associate, where the law specifically requires source of wealth to be established;
- a payment does not obviously match your known profile or income.
The FCA’s Financial Crime Guide sets the expectation that firms gather source-of-funds information as standard and build a source-of-wealth picture for higher-risk customers. For most people, that means the question arrives on the large, infrequent transfers — exactly the ones where the exchange rate matters most.
What documents evidence source of wealth?
There is no single document that proves source of wealth. You build a picture from records that match how you say your wealth arose, and the evidence a firm accepts depends on the origin.
| How the wealth arose | Evidence that typically satisfies the check |
|---|---|
| Employment income and savings | Payslips, employment contract, and bank statements showing salary accumulating |
| Sale of a property | Completion statement, the sale contract, and proof the proceeds reached your account |
| Sale of a business | Sale and purchase agreement, company accounts, and an accountant’s or solicitor’s confirmation |
| Inheritance | Grant of probate, the will, or a letter from the estate’s solicitor |
| Investments or a share portfolio | Broker or fund statements showing holdings and gains over time |
| Pension | Pension provider statements or a lump-sum payment letter |
| A gift | A letter from the person giving the gift, plus their own source-of-funds evidence |
Documents should be recent, legible and in your name, and a firm may ask for a certified translation where they are not in English. Providing clear evidence up front is the single biggest factor in how quickly a large payment clears — see our guide to the documents you will be asked for, and to proof of funds and source of funds for the transaction-level checks that sit alongside this.
How is source of wealth checked on a large currency transfer?
A specialist currency broker gathers this information once, at onboarding, and again where a specific transfer triggers enhanced due diligence. You are identified, the purpose of the payment is confirmed, and the source of the money — and, where needed, of your wider wealth — is evidenced before funds move.
Cambridge Currencies is a UK specialist currency broker that handles large transfers by phone with a dedicated specialist, so the compliance side is explained rather than left to a form. Client funds are safeguarded by our FCA-authorised payment partners, Currencycloud and ScioPay, and held at a credit institution — you can read how that safeguarding works. Some corridors also add their own documentation on the receiving side; sending money to India, for example, involves specific account and purpose requirements.
A worked example: why the timing of the check matters
Imagine a buyer converting £750,000 from a completed property sale into euros. At an illustrative rate of 1.17, that is €877,500.
Suppose the transfer is held for several days while source-of-wealth documents are gathered, and the rate drifts around 2% against the buyer, to about 1.1466. The same £750k now buys roughly €859,950 — about €17,550 less, purely because of timing.
The figures are illustrative, not a forecast. The point is that a compliance delay on a large sum is not only an inconvenience — it is exposure to the market. Fixing your rate in advance can lock the euro amount while the paperwork completes, and tools such as the currency converter and our currency forecasts help you see where the market sits before you commit. You can also check the current GBP/EUR rate as a benchmark.
Common mistakes with source-of-wealth evidence
- Confusing the two checks — sending proof of one payment when the firm asked how your overall wealth arose.
- Evidence that does not match the explanation — a stated business sale supported only by payslips.
- Out-of-date or unnamed paperwork — statements that are months old, or in a joint or company name with no explanation.
- Leaving it to the last minute, so the check runs while the rate moves and a deadline approaches.
- Assuming a question means suspicion — enhanced checks are a legal requirement for regulated firms, not an accusation. See why a transfer can be placed on hold and how to clear it.
How a specialist broker helps with source-of-wealth checks
The value of a specialist is that the compliance conversation happens with a person who does it every day. A dedicated dealer can tell you in advance which documents will satisfy the check for your situation, so you gather them once rather than in stages.
That preparation keeps a large transfer moving and lets you fix your rate at the right moment rather than waiting on paperwork. It also means the verification that protects you — confirming who you are dealing with and where the money is going — runs smoothly. For very large sums, our guide to options for large transfer support covers the wider process.
Frequently asked questions
Is source of wealth the same as source of funds?
No. Source of funds is where the money in one specific transfer came from; source of wealth is how your overall wealth was built up over time. A firm may ask for both, and source of wealth is usually the more involved of the two.
When do I need to prove source of wealth for a transfer?
Checks are risk-based rather than tied to a fixed amount. Source of wealth is most likely to be requested on large or complex transfers, for politically exposed persons, or where a payment is linked to a high-risk country or does not match your known profile.
What documents count as source-of-wealth evidence?
Records that match how your wealth arose — payslips and savings for employment income, a completion statement for a property sale, a sale agreement and accounts for a business exit, or a grant of probate for an inheritance. Investment and pension statements are also commonly used.
Why is my currency broker asking where my money came from?
Because UK law requires it. Under the Money Laundering Regulations 2017, regulated firms must carry out due diligence and, in higher-risk cases, establish source of wealth and source of funds. It is a legal obligation, not a judgement about you.
Can source-of-wealth checks delay my transfer?
They can, if evidence is missing or unclear. Gathering the right documents before you trade is the best way to keep a large payment on schedule — and fixing your rate in advance protects you from market moves while the checks complete.
Do all transfers need source-of-wealth evidence?
No. Many routine transfers need only identity and source-of-funds checks. Source of wealth tends to apply to the larger, less frequent payments, and to the higher-risk situations defined in the regulations.
Speak to a specialist
Planning a large or higher-value transfer where compliance checks may apply? Speak to a Cambridge Currencies specialist about preparing your source-of-wealth evidence and fixing your rate — every transfer is handled by phone with a dedicated dealer. Request a quote or get in touch.
