How to prove the source of funds for buying a house in the UK? What documents are required for remittances from parents?

"The money has been in my UK account for a year already. Why does the lawyer still ask me to write where it came from?"

Because the question the rules ask is never "do you have this money," but "how did you obtain this money." Regulation 28 of the Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017 imposes this obligation on lawyers: they must understand the source of the funds, and if they cannot understand it, they cannot complete the transaction for you. The balance sitting for a long time does not constitute an explanation.

At which step did the lawyer start asking for money?

The usual process is: the agent will conduct a first round of identity and purchasing ability verification when your offer is accepted; the lawyer will issue the Source of Funds questionnaire during the instruction phase; exchange will not arrange if the documents are incomplete. On the completion day, the remaining payment must be transferred from your personal UK account to the law firm's client account.

The problem is almost always about time. The overseas bank statements need to be certified and translated, which usually takes one or two weeks back and forth, while the seller only proceeds according to the chain's schedule.

Since June 30 this year, most provisions of The Money Laundering and Terrorist Financing (Amendment) Regulations 2026 (SI 2026/621) have come into effect, narrowing the trigger for enhanced due diligence (EDD) from "complex transactions" to "unusual complexity", and changing various thresholds from euros to pounds (for example, the original one-off transaction threshold of €1,000 has been changed to £800). Do not read this as a relaxation: funds from overseas remain on the high-risk list, the term "complex" is being narrowed, not the term "cross-border".

Documents required for the source of funds when buying a house in the UK, categorized by the source of money

The gift letter must clearly state three things: interest-free, no need to repay, and the donor does not claim any share of the property. A vague statement like "discuss later" will make the mortgage bank treat it as an implicit loan.

The part that really blocks the transaction is how the money comes in.

A long-standing saying in the circle is: if the money has been in the UK account for six months, the lawyer will only look at those six months and not go further back. This statement doesn't hold water. The six-months' transaction record addresses "where the funds are," while Source of Funds refers to "how the money was obtained." The account history merely pushes the issue one step forward, but cannot eliminate it. What truly allows the lawyer to approve is the document before that step.

The cleanest path is only one: from the donor's account → your account → the law firm's client account, without passing through any third party.

The LSAG anti-money laundering guidelines for the legal industry, April 2025 edition (v1.1, effective from April 23, 2025), specifically added the scope of due diligence for third-party funding: who the funder is, what relationship they have with you, and where their money comes from, all need to be investigated separately. For each additional funder, a complete set of documents is required.

So my judgment is clear: do not accept any arrangements where funds are transferred in batches through friends' or relatives' accounts, even if it's just one transaction, even if the other party is a close relative. This is not a moral issue, but a process cost issue - once there are multiple small deposits from different sources, the lawyer's risk rating will jump to a higher level, and what is required next is not just adding one document, but the complete background of an entire person. The handling fee saved is not worth the transaction being halted halfway. For cross-border transactions, keep all the purpose statements and original bank slips for each remittance according to current regulations, prepare certified translated copies of overseas bills, and clearly state the purpose in the remarks, without leaving it blank.

If you are unsure how to explain your funds or how to write a gift letter, you can pay £5 on justiscript.com to have a practicing UK lawyer answer a question in writing, either in Chinese or English, which is more convenient than trying to figure it out yourself.

The time required for the materials is almost always underestimated: certified translation, requesting historical bank statements from overseas banks, and having parents sign a properly formatted gift letter, all together take at least two or three weeks. If you start gathering them only after the offer is accepted, you'll have to rush within the countdown of the exchange. This article is for reference only; please consult a licensed attorney for specific issues.

[Data source] The Money Laundering and Terrorist Financing (Amendment) Regulations 2026 (SI 2026/621, legislation.gov.uk); Money Laundering Regulations 2017 regulation 28; LSAG "AML Guidance for the Legal Sector" April 2025 edition

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