To send a large international transfer from the UK, you’ll usually need to prove your source of funds — documentary evidence of where the money came from, such as a property completion statement, a signed sale contract, payslips, or inheritance papers. UK-regulated payment providers are required to verify this under the Money Laundering Regulations 2017 before releasing a high-value payment. Preparing the right documents early is the single biggest thing that keeps a large transfer moving.
Who this guide is for
This guide is for anyone moving a large sum across borders from the UK — property buyers and sellers, people repatriating overseas sale proceeds, those receiving an inheritance or gift, business owners, and individuals emigrating with their savings. If your transfer is well into five or six figures, expect a source-of-funds check, and read on so you’re ready for it.
What is source of funds?
Source of funds is the origin of the specific money used for a single transaction — for example, the proceeds of a house sale, accumulated salary savings, an inheritance, a company dividend, or the sale of investments. It answers one question: where did this money come from?
A regulated provider cannot accept a source of funds by your word alone. If you say the money came from a property sale, the provider must see evidence that the sale happened, that the proceeds match the amount described, and that the funds can be traced to that event. Verification doesn’t demand forensic certainty — it requires reasonable steps to confirm your explanation is plausible and consistent with the evidence.
Source of funds vs source of wealth: what’s the difference?
These two terms are often confused, and the distinction matters when you’re moving a large amount.
Source of wealth is how you built your overall wealth over time; source of funds is the origin of the money in one particular transaction. A retired professional might have a source of wealth built from decades of salary, pension contributions and property — while the source of funds for today’s £500,000 transfer is specifically the sale of a second home.
| Source of funds (SoF) | Source of wealth (SoW) | |
|---|---|---|
| What it covers | The money behind one specific transaction | How your total wealth was accumulated |
| Typical question | “Where did this £400,000 come from?” | “How did you come to have your wealth?” |
| When it’s asked | Most large or unusual transactions | Higher-risk clients, PEPs, very high-value relationships |
| Example evidence | Property completion statement | Career history, business sale, long-term investment growth |
For most people sending a large transfer, the check focuses on source of funds. Source of wealth questions tend to arise for politically exposed persons (PEPs), very high-net-worth clients, or where the wider picture needs to make sense alongside the single payment.
When do you need to prove your source of funds?
UK-regulated firms work to a risk-based framework set out in the Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017. Customer due diligence is required under Regulation 27, and enhanced due diligence under Regulation 33. The Financial Conduct Authority supervises how firms apply these rules, supported by the HM Treasury–approved JMLSG guidance.
In practice, you can expect a source-of-funds check when:
- The amount is large or high-value. There’s no single legal threshold — firms set their own risk-based triggers — but large transfers are routinely reviewed. At Cambridge Currencies, our minimum transfer is £5,000, and checks scale up with the size and nature of the payment.
- The transaction looks inconsistent with your known profile. A payment far larger than your usual activity will prompt questions.
- The transfer involves a higher-risk country or a complex chain of ownership.
- You’re classified as a politically exposed person. Enhanced due diligence — including both source of funds and source of wealth — is mandatory for PEPs and their close associates.
These checks aren’t a sign anyone suspects wrongdoing. They are a standard, legally required part of moving money, and every reputable provider runs them. You can read more on how much money you can transfer abroad from the UK and the wider documents needed for large international transfers.
What documents count as proof of funds?
The right evidence depends on where your money came from. The key principle is consistency: the document should clearly show the amount, the date, and a trail you can follow into your bank account. Here’s what’s typically accepted by source.
| Where the money came from | Documents that usually satisfy a source-of-funds check |
|---|---|
| Property sale | Completion statement from the conveyancer or notary, signed sale contract, and the bank statement showing the proceeds arriving |
| Salary and savings | Recent payslips, employment contract, and bank statements showing the funds building up over time |
| Inheritance | Grant of probate, a letter from the executor or solicitor, and the statement showing the distribution |
| Gift | A signed gift letter from the donor, plus evidence of the donor’s own source of funds |
| Business sale or dividends | Sale agreement or share purchase documents, company accounts, or dividend vouchers |
| Investment or share sale | Broker contract notes or a sale confirmation, and the statement showing settlement |
| Pension lump sum | The provider’s statement or drawdown letter |
| Divorce or legal settlement | The court order or settlement agreement |
| Compensation award | The award letter or settlement documentation |
A declaration on its own is never enough. “It’s from savings” needs bank statements that actually show those savings accumulating; “it’s from a house sale” needs the completion statement that matches the figure landing in your account. Where documents are in another language, a certified translation may be requested. For a fuller checklist, see our guidance on the documents required for an international money transfer.
Proof of funds for buying property abroad
Property purchases are the most common reason people face a source-of-funds check, because the sums are large and the timeline is tight. If you’re sending money overseas for a property purchase, your conveyancer’s completion statement is usually the cleanest single piece of evidence — it shows the sale, the figure, and the date in one place.
Two things are worth planning for. First, deposits and completion payments often need to move on a fixed date, so your documents need to be ready in advance rather than gathered under pressure. Second, large property transfers are a known target for fraud: always verify account details directly with your solicitor by phone, never act on payment instructions that arrive by email alone, and read our guidance on avoiding conveyancing fraud on property deposits.
If your completion date is weeks or months away, a forward contract lets you fix today’s exchange rate for a future payment — up to 12 months ahead — so the rate is locked while your funds and paperwork come together. Forward contracts are arranged over the phone with your dealer.
How long does verification take, and how to keep it moving
Most source-of-funds checks are quick when the evidence is clear and consistent. Delays almost always come from documents that don’t quite match — a figure that differs from the amount received, a missing page, or a gap in the trail.
To keep a large transfer on track:
- Gather your core document (completion statement, probate letter, or sale agreement) before you register.
- Make sure the figure on the document matches the amount arriving in your account.
- Keep a clear bank trail — avoid moving the money through several accounts before the transfer, which makes the trail harder to follow.
- Tell your specialist about anything unusual up front, so it can be explained rather than queried later.
In our experience arranging large international money transfers, the clients who clear compliance fastest are simply the ones who prepare their paperwork early. As a typical example, a client repatriating the proceeds of a Spanish property sale clears verification smoothly when they provide the notary’s completion document alongside the receiving bank statement — because the two figures reconcile at a glance.
Why a specialist broker makes this easier
A high-street bank will often hand you a generic checklist and leave you to work it out. A specialist currency broker does the opposite: at Cambridge Currencies, every client is assigned a dedicated specialist who guides you through exactly what’s needed for your situation, by phone, before anything is submitted.
Cambridge Currencies is a specialist UK currency broker founded in 2023. We are not ourselves an FCA-authorised firm; we arrange transfers through our FCA-authorised partners — Currencycloud (FRN 900199) and ScioPay (FRN 927951) — whose regulated infrastructure carries out the customer due diligence and holds client funds in safeguarded accounts. You can read more about how client funds are safeguarded and how we work.
Anthony Bull, CEO of Cambridge Currencies, puts it plainly: “The clients who find source-of-funds checks stressful are almost always the ones who hit them by surprise. When we know the shape of a transfer in advance, we can tell someone exactly which document will satisfy the check — and the whole thing becomes a formality rather than a hold-up. Compliance done well is invisible to the client.”
That human, phone-based approach is the difference. A specialist can look at your circumstances, tell you which single document will clear the check, and flag anything that needs explaining before it becomes a delay — support a checklist simply can’t give. If you want reassurance on the wider question of provider safety, see our guidance on whether currency brokers are safe.
Frequently asked questions
What is proof of funds for an international transfer?
Proof of funds is documentary evidence showing where the money for your transfer came from — for example a property completion statement, payslips and bank statements, or inheritance papers. UK-regulated providers must verify it before releasing a large payment.
Is there a transfer amount that triggers a source-of-funds check?
There’s no single legal threshold in the UK. Firms set their own risk-based triggers under the Money Laundering Regulations 2017, but large or unusual transfers are routinely checked. The bigger the amount, the more likely a check.
What’s the difference between source of funds and source of wealth?
Source of funds is the origin of the money in one specific transaction. Source of wealth is how you built your overall wealth over time. Most large transfers focus on source of funds; source of wealth is usually asked of higher-risk or very high-value clients.
Can I just declare where the money came from?
No. A declaration alone isn’t enough. The provider must see evidence that supports your explanation and matches the amount being transferred — for example a sale contract and the bank statement showing the proceeds arriving.
What documents prove source of funds from a property sale?
Typically the completion statement from your conveyancer or notary, the signed sale contract, and the bank statement showing the proceeds landing in your account. These should all show the same figure.
How long does source-of-funds verification take?
Usually a short time when the evidence is clear and consistent. Delays come from mismatched figures, missing pages, or a money trail that runs through several accounts. Preparing your core document in advance keeps it quick.
Do I need proof of funds when buying property abroad?
Almost always, because the sums are large. Your conveyancer’s completion statement is usually the cleanest evidence. Verify all payment details by phone to avoid conveyancing fraud, and consider fixing your rate with a forward contract.
Who actually carries out the checks at Cambridge Currencies?
The customer due diligence is carried out through our FCA-authorised partners, Currencycloud (FRN 900199) and ScioPay (FRN 927951), who also safeguard client funds. Cambridge Currencies arranges your transfer and guides you through what’s needed.
Moving a large sum soon?
If you’re preparing a large international transfer — a property purchase, a sale repatriation, or an inheritance — speak to a Cambridge Currencies specialist before you start. We’ll tell you exactly which documents will satisfy your source-of-funds check and arrange your transfer by phone with a dedicated dealer. Request a quote or call us on +44 (0)1223 608232.
