When must you file a Land Transaction Tax return in Wales?
LTT return deadline in Wales
A buyer must make an LTT return for a notifiable land transaction within 30 calendar days starting on the day after its effective date.
- Completion is normally the effective date.
- Early possession or payment can make an earlier date apply.
- A chargeable transaction needs a tax calculation in the return.
Scroll down for the full analysis.
Read the original guidance here:
When must you file a Land Transaction Tax return in Wales?
If you buy land or property in Wales, you may need to send an LTT return to the Welsh Revenue Authority (WRA). LTT is Wales’s version of stamp duty on property. The usual deadline is 30 calendar days after the key date for the deal. Missing that date can matter.
What this rule is about
The return tells WRA about a land deal and, where tax is due, the amount you have worked out. The law puts this duty on the buyer.
The key question is not invariably, “when did I get the keys?”, because completion is usually the key date, although an earlier event can sometimes start the clock. Completion usually controls.
What the official source says
WRA’s guidance says you must file a return for every notifiable land transaction that has completed or been substantially performed. The law requires the return within 30 days beginning on the day after the effective date.
- The deadline uses calendar days, not working days.
- Day one is the day after the effective date.
- A return for a chargeable transaction must include your tax calculation.
- A notifiable deal is not necessarily one on which tax is payable.
In most ordinary purchases, the effective date is completion. If a contract is completed without earlier substantial performance, the law treats completion as the effective date.
Substantial performance can happen before completion. This includes taking possession of all, or almost all, of the property. Payment can trigger substantial performance. This may occur when all, or almost all, of the amount due has been paid or provided.
What this means in practice
Ask whether an LTT return is needed before completion, because although that may be fine in a straightforward purchase, it may not be where you move in early or pay most of the price early. Check early.
- Check whether the deal is notifiable before the deadline approaches.
- Write down the completion date and any earlier possession date.
- Check whether most of the price was paid before completion.
- Use calendar days when working out the filing date.
WRA’s examples show that the deadline ends at midnight. They also show why the length of the month matters. You count 30 days from the day after the effective date, rather than adding a calendar month.
How to analyse it
Work through the questions in this order. The first issue is whether a return is required at all. The next is which date starts the 30-day period.
- Is this a land transaction in Wales?
- Is it notifiable under the LTT rules, or does an exception apply?
- What is the effective date?
- Did completion happen before any substantial performance?
- If not, did early possession or early payment make the contract substantially performed?
- Starting with the next day, what is the 30th calendar day?
- If the deal is chargeable, has the return included a tax calculation?
A return can be due without tax. Whether it is notifiable is a separate question under the legislation.
Example
Ms A buys a new home and completes on 7 April 2020. She had not moved in or substantially paid for it before then. WRA’s guidance treats 7 April as the effective date. Since the 30-day period starts on 8 April, her return must reach WRA by midnight on 7 May 2020, with the date counted from the day after the effective date. That is the deadline.
Change the month and the result can look surprising. Mr B completes on 7 March 2020, with no earlier substantial performance. His 30-day period starts on 8 March and ends at midnight on 6 April 2020. It is not simply “the same date next month”.
Why this can be difficult in practice
Completion is easy to spot. Earlier substantial performance can be harder. A buyer may move in under a temporary arrangement, receive rent from the property, or make a large payment before the formal transfer.
- Getting keys or taking occupation may be relevant, even before completion.
- Receiving rent, or gaining the right to receive it, can count as possession.
- Paying most of the price early may change the effective date.
- A low-tax or no-tax deal can still need a return if it is notifiable.
WRA’s page is guidance, not the law itself. The deadline and self-assessment duty come from section 44. The detailed question of whether a deal is notifiable depends on the statutory rules and any relevant exception.
Key takeaways
- The usual LTT filing period is 30 calendar days from the day after the effective date.
- Completion is usually the effective date, but earlier possession or payment can change it.
- Check whether your deal is notifiable, even if you expect no LTT to pay.
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 10 — effective date where contracts complete or are substantially performed
- LTTA 2017 section 14 — when a contract is substantially performed
- LTTA 2017 section 17 — when a land transaction is chargeable
- LTTA 2017 section 44 — duty to make an LTT return and self-assessment
- LTTA 2017 section 45 — which land transactions are notifiable
- LTTA 2017 section 46 — exceptions from notification for certain land interests
- LTTA 2017 section 71 — general meaning of a transaction’s effective date
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 supplied statutory library does not include the currency notice requested in the brief. Current law should be checked before relying on this page for a transaction after the source examples from 2020.
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
- Any earlier date when possession was taken or most of the price was paid
- The contract and transfer documents
- Details needed to decide whether the transaction is notifiable
- The figures used for the tax calculation, if tax is due
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 When must you file a Land Transaction Tax return in Wales? [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 10 - effective date where contracts complete or are substantially performed https://www.legislation.gov.uk/anaw/2017/1/section/10 - LTTA 2017 section 14 - when a contract is substantially performed https://www.legislation.gov.uk/anaw/2017/1/section/14 - LTTA 2017 section 17 - when a land transaction is chargeable https://www.legislation.gov.uk/anaw/2017/1/section/17 - LTTA 2017 section 44 - duty to make an LTT return and self-assessment https://www.legislation.gov.uk/anaw/2017/1/section/44 - LTTA 2017 section 45 - which land transactions are notifiable https://www.legislation.gov.uk/anaw/2017/1/section/45 - LTTA 2017 section 46 - exceptions from notification for certain land interests https://www.legislation.gov.uk/anaw/2017/1/section/46 - LTTA 2017 section 71 - general meaning of a transaction's effective date 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/land-transaction-tax-returns-and-payments-technical-guidance#5527 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 supplied statutory library does not include the currency notice requested in the brief. Current law should be checked before relying on this page for a transaction after the source examples from 2020. 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: When must you file a Land Transaction Tax return in Wales?
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