Taking on a mortgage when property is transferred: LTT
Debt and LTT
Taking on a mortgage or other secured debt can count as payment when property is transferred in Wales, even if no cash changes hands.
- Check the debt balance and loan documents.
- Check whether responsibility changes because of the transfer.
- Use the relevant ownership share for secured debt and joint ownership.
Scroll down for the full analysis.
Read the original guidance here:
Taking on a mortgage when property is transferred: LTT
When someone transfers property to you, you may take on all or part of a mortgage, and that debt can count as payment for Welsh land transaction tax, or LTT. LTT is Wales’s version of stamp duty. This can matter even where little, or no, cash changes hands.
What this rule is about
When someone transfers property, a person may also assume responsibility for debt secured against it, including a mortgage, and that assumption can affect LTT. It can matter.
The tax looks at what you give in return for your share of the property. Taking on debt can be one part of that amount. It is easy to miss.
This often arises when a couple add one person to the title, remove one person from it, or change how they own a home.
What the official source says
Schedule 4 paragraph 8 treats debt as payment. It does so for an LTT transaction. This includes debt that is paid off or released as part of the transfer, and existing debt that the buyer takes on.
The Welsh Revenue Authority’s technical guidance explains how it reads this rule. The guidance is not the law, but it helps show how the authority approaches common mortgage transfers.
- If you take on existing debt, the amount taken on can count as payment for LTT.
- If you take on debt and the transfer releases the seller from it, count it once.
- A direct promise to the lender can show that you have taken on the debt.
- A lender’s release of the seller from their promise can also matter.
- An agreement to cover the seller’s debt payments can also point to you taking on the debt.
- These points apply where rights or duties for debt secured on the property change because of the transfer.
What this means in practice
You may be giving something of value even if the transfer deed says no money is changing hands. The mortgage balance, rather than a cash gift, may be the important figure.
That does not mean the whole mortgage always counts. Where the property is or becomes jointly owned, the law uses the relevant ownership share to work out the debt treated as taken on.
- For joint tenants, divide the secured debt equally between the joint owners.
- For tenants in common, split the secured debt using each owner’s stated share.
- Use the ownership position before and after the transfer.
- Check whether a charge secures the debt against the property being transferred.
A lender may be able to ask either joint borrower for the full mortgage. That is a lender issue. For this LTT rule, the official guidance uses the relevant share of the debt instead.
How to analyse it
Start with the debt and the transfer documents, not just the cash price. The key question is: what responsibility for the debt moves because of this property transfer?
- Identify every debt connected with the transfer.
- Check whether the debt was already in place before the transfer.
- Check whether a charge secures it on the property.
- Find the outstanding amount when the transfer takes effect.
- Read the lender’s documents for any new borrower, release or change in responsibility.
- Check the ownership shares immediately before and immediately after the transfer.
- Work out the share of the debt that the incoming owner takes on.
- Add any separate cash or other payment given for the transfer.
Do not assume that changing a name on the title is enough to answer the tax question. The related mortgage arrangements can change the result.
Example
Amir owns a home alone. It has an outstanding mortgage of £200,000. He transfers the home into joint ownership with Priya, and they become joint tenants. Priya takes on responsibility for the mortgage and gives no other payment.
There are two equal joint owners after the transfer. Under the rule explained in the official source, because Priya takes responsibility for the mortgage and makes no other payment, she is treated as giving £100,000: one half of the outstanding debt. That is her relevant share. The example does not work out any LTT due. It shows the amount that can count as payment for the transfer.
Change one fact and the figure may change. If they owned the property as tenants in common, with Priya holding 40%, her relevant share would be 40% of the debt instead.
Why this can be difficult in practice
Tax paperwork often uses different language. A transfer deed, mortgage offer and private agreement may each describe responsibility differently, even though each can concern the debt responsibility that changes under the tax rule. The wording can mislead.
You might think only a new name on the mortgage matters. It does not. When the seller is released from responsibility, or you agree to protect them from the debt, either arrangement may be relevant to the transfer and its LTT treatment. Both can matter.
- A transfer can involve debt even where no cash is paid.
- Joint ownership does not automatically mean half the debt in every case.
- Equal shares apply to joint tenants, not necessarily to tenants in common.
- The lender’s ability to recover a debt is different from the LTT calculation.
- The facts and documents must show what changed because of the transfer.
Key takeaways
- Taking on a mortgage can count as payment for LTT.
- Debt that also releases the seller is counted only once.
- For joint owners, use the ownership share to split secured debt.
Technical analysis
For advisers, and for anyone who wants to check the law behind this page. You do not need this section to understand the guidance above.
Legislation
- LTTA 2017 Schedule 4 para 8 — when debt counts as payment for LTT
Official guidance
The pages below are the Welsh Revenue Authority’s guidance. Guidance is not law. It sets out how the Welsh Revenue Authority reads the legislation, and it is not binding on you, on a tribunal or on a court. Where guidance and the legislation differ, the legislation wins. the Welsh Revenue Authority can also change or withdraw guidance, and it may not cover your facts.
Where this is not settled
- Whether a change in loan documents or an agreement between the parties changes responsibility for a debt can depend on the documents and facts.
- The supplied statutory material does not record a currency date, so the rule should be checked against legislation in force for the transaction date.
Evidence you would need
This kind of case is decided on the facts of the individual property. These are the records that usually settle it, and the ones an adviser would ask you for.
- The transfer deed and ownership details before and after the transfer.
- The mortgage or other debt documents.
- The debt balance when the transfer takes effect.
- Any agreement releasing the seller or requiring the buyer to cover the debt.
Explore this with an AI
Readers often want to test their own situation. Copy the prompt below into ChatGPT, Claude or Gemini. It hands the model the actual legislation for this page rather than letting it answer from memory, and tells it to be explicit about what is uncertain. What comes back is information, not advice – check it against the links above.
I am researching Land Transaction Tax (LTT), the tax on property in Wales. It replaced Stamp Duty Land Tax in Wales on 1 April 2018, and SDLT does not apply in Wales. MY QUESTION Taking on a mortgage when property is transferred: LTT [Replace this with your own situation: what you are buying, the price, the dates, who the buyer is, and what you plan to do with the property.] THE LAW THIS TURNS ON - LTTA 2017 Schedule 4 para 8 - when debt counts as payment for LTT https://www.legislation.gov.uk/anaw/2017/1/schedule/4/paragraph/8 Guidance page from the Welsh Revenue Authority on this topic (guidance, not law): https://www.gov.wales/chargeable-consideration-technical-guidance#5152 HOW I WANT YOU TO ANSWER 1. Work from the legislation above. Read it before answering. Guidance from the Welsh Revenue Authority is its view of the law, not the law, and does not bind a tribunal or a court. 2. Tell me what the rule actually requires, in plain English. 3. Tell me which facts decide the answer, and which facts would change it. 4. Tell me what evidence I would need to support the position. 5. Be explicit about anything unsettled or fact-sensitive. Do not guess. 6. Your training data has a cutoff and SDLT rates and reliefs change at fiscal events. Say so if you are not sure the law is current. POINTS ALREADY KNOWN TO BE UNCERTAIN ON THIS TOPIC - Whether a change in loan documents or an agreement between the parties changes responsibility for a debt can depend on the documents and facts. - The supplied statutory material does not record a currency date, so the rule should be checked against legislation in force for the transaction date. Do not give me a conclusion you cannot support from the provisions above.
Legislation links show the Land Transaction Tax and Anti-avoidance of Devolved Taxes (Wales) Act 2017 as it stood on 2025-11-17. The law may have changed since, and the rules that apply are those in force on the date of your transaction. The official guidance this page is based on is here.
This page was last updated on 3 September 2026
Useful article? You may find it helpful to read the original guidance here: Taking on a mortgage when property is transferred: LTT
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