Buying a home with someone else: when higher LTT rates can apply
Joint buyers and higher LTT rates
For a joint purchase in Wales, the higher LTT rates can apply to the whole transaction if they apply to one buyer.
- Check every owner’s other property interests.
- A spouse or civil partner may affect the result.
- Living in the new property is not the only issue.
Scroll down for the full analysis.
Read the original guidance here:
Buying a home with someone else: when higher LTT rates can apply
Buying with someone else: higher LTT rates
Buying a home with a friend or relative does not protect you from the higher Land Transaction Tax rates. One qualifying joint buyer is enough. The entire purchase can therefore fall within the higher rates. That can change the stamp duty bill for everyone.
What this rule is about
Higher LTT rates can apply when you buy a residential property while you already have an interest in another home. The law looks at each individual buyer. It does not average their positions or ignore one person’s other property.
This is the point people often miss: a joint purchase has one tax result. One buyer’s position can affect both buyers.
What the official source says
Welsh Revenue Authority guidance says the higher rates apply to every person buying the property, and to their spouse or civil partner. Where either buyer meets the conditions, the official guidance treats the whole transaction, rather than only that buyer’s share, as subject to the higher rates.
- This can matter when you buy with a friend.
- It can matter when you buy with a family member.
- It can matter when you buy to help someone else.
- It may still matter if you will not live in the property.
- The guidance says these rules may apply where the title deeds record you as a legal owner of the property.
What this means in practice
Look beyond your own position; the other buyer’s position matters as well. You may own no home yourself, yet a co-buyer’s existing ownership can still trigger higher rates for the purchase as a whole.
Nor can a married couple usually treat one partner’s purchase as separate. Where spouses or civil partners are living together, the law can test the purchase as though the other partner were also a buyer.
- Check every person who will own the property.
- Check whether any buyer owns an interest in another home.
- Check the position of a buyer’s spouse or civil partner.
- Check the facts at the end of the completion day.
- Check whether an exception for replacing a main home may apply.
How to analyse it
Begin with ownership. Leave occupancy and mortgage questions until later. The key question is: who is actually acquiring an interest in the property?
- List all people acquiring the property.
- Read the transfer and title documents.
- For each buyer, identify any other home interest they hold.
- Consider a spouse or civil partner who is living with them.
- Apply the higher-rate test to each buyer separately.
- If it applies to one buyer, treat the joint purchase as a higher-rate purchase.
- Then consider whether a statutory exception changes that answer.
Example
Amira and Ben buy a flat together. Amira owns no other home. Ben already owns a house and will keep it when the flat purchase completes. Ben meets the higher-rate conditions because he keeps his house, so higher rates apply to the purchase by Amira as well as Ben. It does not matter that Amira is a first-time owner.
Why this can be difficult in practice
You might think putting someone on the title is a harmless way to help a child or relative buy. It may not be. The official guidance says legal ownership can bring the higher-rate rules into play, even where that person will not live there.
Money alone and ownership are different things. Someone who helps with a deposit may not be a buyer, but the documents and the real ownership arrangement need to be clear.
- A small share in another home can still matter.
- A home outside Wales can still be relevant to the higher-rate test.
- Spouses and civil partners may be treated together.
- Plans to live elsewhere do not settle the tax result.
- An exception can be fact-sensitive, especially when replacing a main home.
Key takeaways
- One joint buyer’s position can affect the whole purchase.
- Check all owners, not just the person moving in.
- Check spouses and civil partners as well as named buyers.
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 section 7 — who counts as the buyer in a land transaction
- LTTA 2017 Schedule 5 para 3 — when higher rates apply to one home purchases
- LTTA 2017 Schedule 5 para 5 — owning another home when buying a property
- LTTA 2017 Schedule 5 para 6 — higher rates where there are joint buyers
- LTTA 2017 Schedule 5 para 25 — how spouses and civil partners are treated
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
- Simply helping with money does not, by itself, show whether someone has acquired an interest in the property. The ownership arrangements need checking.
- Being named on the title is an important fact, but the legal analysis also depends on what interest each person has acquired.
- This page does not decide whether a particular buyer qualifies for an exception to the higher rates.
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 and title documents showing every legal owner
- Details of each buyer’s existing home interests on the completion date
- Information about any spouse or civil partner and whether they were living together
- Documents showing whether the purchase replaces an only or main home
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 Buying a home with someone else: when higher LTT rates can apply [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 section 7 - who counts as the buyer in a land transaction https://www.legislation.gov.uk/anaw/2017/1/section/7 - LTTA 2017 Schedule 5 para 3 - when higher rates apply to one home purchases https://www.legislation.gov.uk/anaw/2017/1/schedule/5/paragraph/3 - LTTA 2017 Schedule 5 para 5 - owning another home when buying a property https://www.legislation.gov.uk/anaw/2017/1/schedule/5/paragraph/5 - LTTA 2017 Schedule 5 para 6 - higher rates where there are joint buyers https://www.legislation.gov.uk/anaw/2017/1/schedule/5/paragraph/6 - LTTA 2017 Schedule 5 para 25 - how spouses and civil partners are treated https://www.legislation.gov.uk/anaw/2017/1/schedule/5/paragraph/25 Guidance page from the Welsh Revenue Authority on this topic (guidance, not law): https://www.gov.wales/higher-rates-land-transaction-tax-guide 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 - Simply helping with money does not, by itself, show whether someone has acquired an interest in the property. The ownership arrangements need checking. - Being named on the title is an important fact, but the legal analysis also depends on what interest each person has acquired. - This page does not decide whether a particular buyer qualifies for an exception to the higher rates. 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: Buying a home with someone else: when higher LTT rates can apply
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