LTT from 1 April 2018: when Welsh property stopped being subject to SDLT
LTT replaced SDLT for Welsh land
For a deal effective on or after 1 April 2018, land in Wales falls within LTT rather than SDLT.
- Check where the land is located
- Check the effective date
- Take extra care with border-crossing land
Scroll down for the full analysis.
Read the original guidance here:
LTT from 1 April 2018: when Welsh property stopped being subject to SDLT
LTT from 1 April 2018: when Welsh property stopped being subject to SDLT
If your property deal had an effective date on or after 1 April 2018 and involved land in Wales, Welsh land transaction tax replaced stamp duty land tax. This change matters because the Welsh Revenue Authority, rather than HMRC, administers LTT.
What this rule is about
Wales took control of land-deal tax. The key question does not concern where you live or sign documents. The answer depends on whether the deal includes Welsh land and when its effective date falls.
Completion usually provides the effective date. However, the law can set a different date in some situations. That detail can decide which tax system applies.
What the official source says
The Welsh Government’s transitional guidance describes the change from SDLT to LTT and explains that, where the effective date is on or after 1 April 2018, LTT rather than SDLT covers the Welsh part of the deal. That distinction governs the Welsh part.
- The transaction must have an effective date on or after 1 April 2018.
- It must include an interest in land in Wales.
- A cross-border deal includes only the Welsh land within it.
- SDLT does not treat that Welsh transaction as an SDLT land transaction.
- The guidance does not link it for SDLT with the transactions listed in the guidance.
- The Welsh Revenue Authority administers LTT.
What this means in practice
Do not assume that SDLT applies to a property deal just because part of it relates to England or another part of the UK. From the stated date, land in Wales has its own tax system.
To help identify whether land or property is in Wales, the Welsh Government provides a postcode tool. It is a sensible first check when arranging a purchase or lease. Use it first.
- Check the postcode before deciding which land tax return you need.
- Record the date when the deal became effective, usually completion.
- Flag any purchase that includes land on both sides of the Wales-England border.
How to analyse it
Begin with the location and date. Then separate the Welsh part from anything outside Wales. This approach avoids applying the wrong stamp tax to the wrong land.
- Which land, rights or leasehold interests does the deal cover?
- Is any of that land in Wales?
- What is the transaction’s effective date?
- Does the deal cover land in both Wales and England?
- For a border-crossing deal, which part relates to Welsh land?
Example
Rhodri completes a purchase on 2 April 2018. The property is entirely in Wales. On the facts given by the official source, SDLT does not apply to that Welsh transaction, which falls within LTT instead.
Now change one fact: the purchase includes land in Wales and England. The Welsh legislation treats the Welsh and English land as separate transactions, with the amount paid divided on a just and reasonable basis.
Why this can be difficult in practice
Border cases are usually hardest. These deals involve a field, accessway or other land close to the border. A single contract can cover land in two tax areas.
You might think the contract heading settles the matter. It does not. What matters is the land that the contract covers, its location and the effective date.
- A postcode may not explain every boundary issue.
- A cross-border price may need to be divided between Welsh and English land.
- An earlier event may affect the effective date in an unusual transaction.
Key takeaways
- From 1 April 2018, Welsh land moved from SDLT to LTT.
- The location of the land is central, not the buyer’s address.
- Cross-border deals may need separate Welsh and English treatment.
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
- FA 2003 section 43 — when stamp duty land tax can apply
- FA 2003 section 108 — when SDLT transactions are treated as linked
- LTTA 2017 section 2 — the charge and Welsh Revenue Authority role
- LTTA 2017 section 3 — what counts as a land transaction
- LTTA 2017 section 4 — interests in land in Wales within LTT
- LTTA 2017 section 9 — treatment of land crossing the Wales-England border
- LTTA 2017 section 71 — the usual effective date of a transaction
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 Government, Transitional guidance: introduction of land transaction tax, paragraph 1.1
Where this is not settled
- A postcode check may identify whether a property is in Wales, but a border case can require closer review of the land included in the transaction.
- This source does not explain every rule that may affect a transaction completed under an earlier contract or arrangement.
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 completion date and any earlier event that could set the effective date.
- The property address, postcode and title plan.
- For a cross-border purchase, details showing which land lies in Wales and which lies in England.
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 from 1 April 2018: when Welsh property stopped being subject to SDLT [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 - FA 2003 section 43 - when stamp duty land tax can apply https://www.legislation.gov.uk/ukpga/2003/14/section/43/2025-11-17 - FA 2003 section 108 - when SDLT transactions are treated as linked https://www.legislation.gov.uk/ukpga/2003/14/section/108/2025-11-17 - LTTA 2017 section 2 - the charge and Welsh Revenue Authority role https://www.legislation.gov.uk/anaw/2017/1/section/2 - LTTA 2017 section 3 - what counts as a land transaction https://www.legislation.gov.uk/anaw/2017/1/section/3 - LTTA 2017 section 4 - interests in land in Wales within LTT https://www.legislation.gov.uk/anaw/2017/1/section/4 - LTTA 2017 section 9 - treatment of land crossing the Wales-England border https://www.legislation.gov.uk/anaw/2017/1/section/9 - LTTA 2017 section 71 - the usual effective date of a transaction https://www.legislation.gov.uk/anaw/2017/1/section/71 Guidance page from the Welsh Revenue Authority on this topic (guidance, not law): https://www.gov.wales/transitional-guidance-introduction-of-land-transaction-tax 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 - A postcode check may identify whether a property is in Wales, but a border case can require closer review of the land included in the transaction. - This source does not explain every rule that may affect a transaction completed under an earlier contract or arrangement. 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 from 1 April 2018: when Welsh property stopped being subject to SDLT
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