Source of Funds Check Explained

Source of funds checks confirm where the money for your property purchase came from, and they are a legal requirement for UK solicitors and estate agents. Get the paperwork wrong and a purchase can stall for weeks right before exchange.

A source of funds check is the process of confirming the origin of the money used in a specific transaction, such as your deposit or the full purchase price. This guide explains what your solicitor needs, the documents that satisfy them, how far back the check goes, and how long it takes, so your conveyancing keeps moving.

What is a source of funds check?

A source of funds check is the verification a regulated firm carries out to understand where the money funding your transaction originated. According to HMRC's Economic Crime Supervision Handbook (ECSH33358), source of funds means the origins of the money used in a particular transaction.

It sits inside the wider customer due diligence a firm completes before acting for you. The aim is simple. Your solicitor or estate agent needs to be satisfied the money is legitimate before it moves through their accounts.

Source of funds vs source of wealth

Source of funds and source of wealth sound alike, but they answer different questions. Source of funds is the origin of the money in one transaction. Source of wealth is the bigger picture of how you built your money over time.

HMRC's guidance sets out that source of wealth refers to a customer's entire wealth and how it was accrued. That includes inheritance, a divorce settlement, a pension, the sale of an asset, a gift, salary, or dividends. So a buyer might evidence the source of funds for a deposit with three months of bank statements, while a politically exposed person may need to evidence their source of wealth across many years.

Why solicitors and estate agents must check your source of funds

The duty comes from anti-money laundering law, not from a firm being awkward. Regulation 28(11) of the Money Laundering Regulations 2017 requires ongoing monitoring of your transactions. Where necessary, that monitoring includes scrutiny of the source of funds, so a transaction stays consistent with what the firm knows about you and your risk profile.

The stakes are high. The UK government's National Risk Assessment 2025 reports the National Crime Agency estimate that over £10 billion is laundered through UK property each year. Property is a favoured route for criminal money, so firms that handle AML checks for estate agents and conveyancers carry real legal exposure.

Under section 327 of the Proceeds of Crime Act 2002, a person commits an offence if they conceal, convert, transfer, or remove criminal property from the UK. That is why your solicitor cannot simply take the money and proceed.

When is a source of funds check required?

A source of funds check is mandatory in certain cases and risk-based in the rest. Under regulation 35 of the Money Laundering Regulations 2017, firms must establish both source of funds and source of wealth in higher-risk cases. That covers any client who is a politically exposed person (PEP), or where either party is established in a high-risk third country.

Outside those triggers, the check is risk-based. But in practice almost every UK property buyer will face one, because conveyancing moves large sums and firms apply enhanced due diligence whenever a transaction looks complex or unusual. The same logic drives how firms verify identity at the start of a matter.

Is a source of funds check always needed?

A source of funds check is mandatory for politically exposed persons and high-risk third country cases, and is otherwise required on a risk-based approach. Most UK buyers will be asked for evidence, and a seller can be checked too, so it is safest to assume the check applies to you.

How do you check the source of funds?

A firm asks how you obtained the money, then checks that explanation against evidence. Acceptable proof includes bank statements, payslips, a property sale completion statement, or a gift letter, and the firm confirms it is consistent with your risk profile. The check is about consistency, not suspicion of you personally.

The steps usually run in this order:

1. Ask you to declare the origin of the funds, often through a short source of funds questionnaire.
2. Request supporting documents that match each part of your explanation.
3. Review whether the evidence is consistent with your stated income, savings, and risk profile.
4. Raise follow-up questions or seek extra documents where a lump sum is unexplained.
5. Record the conclusion on file, then release the funds towards exchange and completion.

What documents prove your source of funds?

The right evidence depends on where the money came from. The Solicitors Regulation Authority's AML guidance tells firms to take a proactive, well-documented approach to the origin of client funds. As part of client due diligence, that matters because a payment arriving from a bank is not by itself proof the money is clean.

Common documents include:

• Bank statements showing the build-up of savings or salary credits.
• Payslips that match the income on your statements.
• A completion statement from the sale of a previous property.
• A signed gift letter and the giver's evidence where you have a gifted deposit.
• Inheritance or probate documents for money left to you.
• Dividend vouchers or company accounts for business income.

If you have a gifted deposit, Propertymark's consumer guidance notes you will usually need a letter from whoever gifted the money, plus evidence of their own source of funds. And a payment from a partner who is also on the title means both buyers are checked, not just the one paying.

How far back does a source of funds check go?

There is no single rulebook period, which surprises many buyers. Armalytix's guide notes that three to six months of statements is commonly requested for salary or savings, but firms should go back as far as needed to evidence a specific lump sum. If an inheritance landed two years ago, the firm wants the inheritance papers from then, not just recent statements.

That variation is real, and buyers feel it. On the r/HousingUK forum, one buyer reported that "our solicitor required ten years bank statements" even though their mortgage lender had asked for only one year. Another replied that finding ten years of records would be "an admin nightmare" after switching banks several times.

The practical lesson is to gather more history than you think you need, especially for any large one-off credit. So if a relative transferred money for the deposit, trace it back to its origin before your solicitor asks.

How long does it take for solicitors to check the source of funds?

A source of funds check usually takes 5 to 10 days once you provide complete documents, though complex cases with several funding sources can take two to four weeks. Missing or mismatched paperwork is the main cause of delay, so completeness matters more than speed.

According to Jones Robinson's timeline guide, full AML checks on a purchase typically take one to two weeks, dropping to three to five working days for simple, well-documented cases. International transfers, multiple sources, or business income push the timeline towards the longer end.

Three myths that delay source of funds checks

Several common beliefs cost buyers time. Clearing them up early keeps your conveyancing on track.

Myth one: there is a £15,000 threshold below which no check is needed. Buyers often repeat this online, with one writing that "you only need to do this check if it is more than £15k". For regulated property work the check is risk-based, so even a modest deposit can be questioned.

Myth two: money from a bank is automatically clean. Both the SRA and the Law Society list this as a top misconception. A regulated account confirms where the money is now, not where it came from.

Myth three: once your identity is verified, the source of funds is covered. Identity and money are separate questions. Confirming who you are tells a firm nothing about whether the funds are legitimate, which is why enhanced due diligence treats them apart.

How Veyco speeds up source of funds checks

Veyco brings identity, AML, PEP, and sanctions checks into one workflow, so source of funds evidence is collected, reviewed, and recorded in a single place. Clients upload bank statements and documents securely, biometric identity verification confirms who they are, and the platform produces an audit-ready record for the file.

Most checks complete in minutes rather than days, which removes the back-and-forth that delays exchange. For firms handling the full transaction, Veyco also offers QEST for signing the Land Registry transfer deed, keeping identity, compliance, and signing in one secure journey. To see how it fits your conveyancing process, book a demo with the UK-based team.