LTT when you buy a bigger share in your main home
Buying another interest in your main home
The LTT higher rates may not apply where you buy a further or different ownership interest in the home that is already your main home.
- You or your spouse or civil partner must already own an interest there.
- The property must be your only or main home before and after completion.
- The exception does not cover a further interest in a second home.
Scroll down for the full analysis.
Read the original guidance here:
LTT when you buy a bigger share in your main home
Buying a further share of the home you live in does not always trigger the LTT higher rates. This can matter when you own other property too. Land Transaction Tax is Wales’s property tax, often called stamp duty, and the higher rates can otherwise apply when you already own another home.
What this rule is about
This rule addresses a narrow but common problem. You already have an ownership interest in your main home and then buy another or different interest in that same home.
For example, you may buy out a co-owner. You may instead surrender an old lease and receive a new one. Neither arrangement is the same as buying another home.
Under the law, a freehold or qualifying leasehold ownership interest is called a major interest. For this rule, a lease of seven years or less does not count as one.
What the official source says
Welsh Revenue Authority guidance explains the exception. That exception concerns the LTT higher rates. Legislation is the law; the guidance explains the authority’s view of how the exception works.
Where the transaction concerns an ownership interest in the same property, the exception applies if both residence conditions are met:
- Immediately before the effective date, you or your spouse or civil partner already held another major interest in that property.
- The property was your only or main home immediately before that date.
- The property remains your only or main home immediately after that date.
- The interest being bought is in that same home, not a different property.
Usually, the effective date is the completion date. In simple terms, the test considers your position immediately before and immediately after completion.
Several arrangements in the guidance can fall within the exception:
- One spouse transfers their whole share in the couple’s jointly owned main home to the other spouse.
- You surrender a lease of your main home and receive a new lease.
- You obtain a lease extension that is granted as a new, separate reversionary lease.
What this means in practice
Even if you own other homes, you can still use this exception. What matters is the property involved in this transaction. It must be your only/main home throughout.
Multiple properties alone do not decide it. A transaction that only changes your interest in your existing main home may be outside the higher rates.
- Buying your co-owner’s share in your main home can qualify.
- A lease change can qualify, even where you own other homes.
- Buying or extending an interest in a holiday home does not qualify under this exception.
- The amount you pay and the other higher-rates conditions still need checking.
Official guidance draws a clear line. Non-main-home lease extensions cannot use this exception.
How to analyse it
Begin with the property in the transaction. Do not begin by counting every property you own. Then consider the position at completion.
- Identify exactly what interest you are buying, receiving or replacing.
- Check whether you already held an ownership interest in that same property just before completion.
- Check whether your spouse or civil partner held that earlier interest instead.
- Ask whether the property was your only or main home immediately before completion.
- Ask whether it remained your only or main home immediately after completion.
- Check whether the transaction is a single-home or multiple-home transaction.
- Check the amount paid and the remaining higher-rates conditions.
Do not assume the exception applies if any residence point is missing. Planning to live there later is not the test described in this guidance.
Example
Arun and Beth own their home together, and Beth lives there as her main home. Arun transfers his whole share to Beth. Beth held an interest before completion. It remains her main home after completion. Under the official guidance, the LTT higher rates do not apply to that transaction under this exception, even if Beth owns other homes.
Now change one fact. Beth pays £40,000 to extend the lease of a flat she owns but does not live in. She also owns several homes. Because the flat is not her main home, the same-main-home exception does not apply. On the facts in the official example, the LTT higher rates apply.
Why this can be difficult in practice
Often, the answer turns on paperwork and real life rather than the name given to the deal. A document described as a lease extension may involve surrendering one lease and granting another.
Main residence may also be a question of fact. Where you actually lived around completion matters more than a label on a form.
- A property may be jointly owned, but only one owner may live there.
- Spouse and civil partner ownership can matter even where only one person buys the new interest.
- A second home does not become a main home simply because work is carried out there.
- A lease document may create a new interest rather than merely alter the old one.
- Short leases need separate care because they may not count as major interests for this rule.
Key takeaways
- A further interest in your existing main home may be outside the LTT higher rates.
- You or your spouse or civil partner must already hold an interest in that same home.
- The property must be your only or main home immediately before and after completion.
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 24 — higher rates residential property transactions under schedule 5
- LTTA 2017 section 68 — what counts as a major interest in land
- LTTA 2017 section 71 — the effective date is usually completion date
- LTTA 2017 Schedule 5 para 3 — higher rates test for a single home purchase
- LTTA 2017 Schedule 5 para 7 — exception for an interest in the same main home
- LTTA 2017 Schedule 5 para 11 — higher rates test for multiple home purchases
- LTTA 2017 Schedule 5 para 15 — higher rates test where one home qualifies
- LTTA 2017 Schedule 5 para 16 — same main home exception for multiple home purchases
- LTTA 2017 Schedule 5 para 37 — short leases excluded from major interest definition
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.
- Welsh Revenue Authority technical guidance, LTTA/8150 Interest acquired in the same main residence
Where this is not settled
- Whether a property is someone’s only or main residence can depend on the facts. The guidance does not give a full list of evidence or factors.
- The guidance gives examples of lease arrangements, but the transaction documents are needed to identify exactly what interest has ended and what new interest has been granted.
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, lease surrender, regrant or lease-extension documents.
- Proof of who held an interest in the home immediately before completion.
- Evidence that the property was your only or main home immediately before and after completion.
- The completion date and the amount paid for the transaction.
- Details of other homes owned by you and, where relevant, your spouse or civil partner.
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 LTT when you buy a bigger share in your main home [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 24 - higher rates residential property transactions under schedule 5 https://www.legislation.gov.uk/anaw/2017/1/section/24 - LTTA 2017 section 68 - what counts as a major interest in land https://www.legislation.gov.uk/anaw/2017/1/section/68 - LTTA 2017 section 71 - the effective date is usually completion date https://www.legislation.gov.uk/anaw/2017/1/section/71 - LTTA 2017 Schedule 5 para 3 - higher rates test for a single home purchase https://www.legislation.gov.uk/anaw/2017/1/schedule/5/paragraph/3 - LTTA 2017 Schedule 5 para 7 - exception for an interest in the same main home https://www.legislation.gov.uk/anaw/2017/1/schedule/5/paragraph/7 - LTTA 2017 Schedule 5 para 11 - higher rates test for multiple home purchases https://www.legislation.gov.uk/anaw/2017/1/schedule/5/paragraph/11 - LTTA 2017 Schedule 5 para 15 - higher rates test where one home qualifies https://www.legislation.gov.uk/anaw/2017/1/schedule/5/paragraph/15 - LTTA 2017 Schedule 5 para 16 - same main home exception for multiple home purchases https://www.legislation.gov.uk/anaw/2017/1/schedule/5/paragraph/16 - LTTA 2017 Schedule 5 para 37 - short leases excluded from major interest definition https://www.legislation.gov.uk/anaw/2017/1/schedule/5/paragraph/37 Guidance page from the Welsh Revenue Authority on this topic (guidance, not law): https://www.gov.wales/higher-rates-purchases-residential-property-technical-guidance#5254 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 property is someone's only or main residence can depend on the facts. The guidance does not give a full list of evidence or factors. - The guidance gives examples of lease arrangements, but the transaction documents are needed to identify exactly what interest has ended and what new interest has been granted. 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: LTT when you buy a bigger share in your main home
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