Welsh land transaction tax: when market value replaces your agreed price
Market value for LTT
Welsh land transaction tax uses the market-value approach in capital gains tax law. The agreed price alone may not answer a rule that asks for market value.
- Section 70 imports the capital gains tax approach.
- VAT can affect the amount used for LTT.
- Check the specific LTT rule first.
Scroll down for the full analysis.
Read the original guidance here:
Welsh land transaction tax: when market value replaces your agreed price
Welsh land transaction tax: when market value replaces your agreed price
For Welsh land transaction tax, the Welsh version of stamp duty, market value has a specific tax meaning. It is more than a label for the price stated in your contract. The law directs you to the market-value rules used for capital gains tax.
What this rule is about
Some LTT rules require a market-value figure. This can matter when the amount agreed does not resolve the tax question. Section 70 of the LTT Act is the starting point.
That section does not establish a distinct Welsh valuation test. Instead, it imports the approach found in capital gains tax law.
What the official source says
The official guidance states that market value for LTT is determined under sections 272 to 274 of the Taxation of Chargeable Gains Act 1992. It makes another point too. VAT can form part of the amount used for LTT.
- Use the capital gains tax rules to work out market value.
- Do not assume the agreed price always answers a market-value question.
- Include VAT where the relevant LTT rule requires it.
What this means in practice
First, identify whether the LTT rule that applies to your transaction calls for market value, rather than simply using the amount recorded in the contract. Then use the imported valuation rules.
- Keep the agreed price separate from the market-value question.
- Check whether VAT affects the amount being considered.
- Read the specific LTT rule that calls for a value.
How to analyse it
Consider the questions in this order. Doing so prevents value, price and VAT from being confused.
- Which LTT rule applies to your transaction?
- Does that rule need market value?
- What evidence supports that value?
- Is VAT part of the relevant amount?
Example
Nia agrees to buy a property for £250,000. Where the LTT rule in question requires market value, she must follow the capital gains tax valuation approach instead of treating the contract price as decisive. The price is only evidence. If VAT is also due, she must check whether the relevant LTT provision includes it.
Why this can be difficult in practice
People often concentrate only on the headline price. That approach can overlook the real issue. The challenge is to establish which LTT provision applies, and whether it calls for market value or a different amount.
- A contract price and market value may need separate consideration.
- VAT is a separate check, not an afterthought.
- The source does not list every situation where market value matters.
Key takeaways
- LTT uses capital gains tax rules for market value.
- Check the exact LTT rule before valuing property.
- Check whether VAT is included in the relevant amount.
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 70 — imports capital gains tax market value rules
- Taxation of Chargeable Gains Act 1992 ss.272-274 — rules used to work out market value (could not parse a provision)
- LTTA 2017 Schedule 4 para 2 — when VAT is included in the amount paid
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
- The source page does not identify every LTT rule that may require a market-value figure.
- The supplied skill does not contain the currency notice requested in the brief, so the current status of the legislation needs checking before publication.
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.
- A valuation basis and supporting property evidence where a market-value figure is needed.
- VAT records, including the date of any option to tax, where VAT may affect the amount used.
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 Market value for Welsh stamp duty: how LTT works it out [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 70 - imports capital gains tax market value rules https://www.legislation.gov.uk/anaw/2017/1/section/70 - LTTA 2017 Schedule 4 para 2 - when VAT is included in the amount paid https://www.legislation.gov.uk/anaw/2017/1/schedule/4/paragraph/2 Guidance page from the Welsh Revenue Authority on this topic (guidance, not law): https://www.gov.wales/chargeable-consideration-technical-guidance#5119 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 - The source page does not identify every LTT rule that may require a market-value figure. - The supplied skill does not contain the currency notice requested in the brief, so the current status of the legislation needs checking before publication. 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: Welsh land transaction tax: when market value replaces your agreed price
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