LTT deferral: choosing the expected end date
Expected end date at a glance
An LTT deferral for a future payment needs an expected end date. Use the predicted date when the event happens or the amount becomes known. If that cannot be predicted, use the relevant five-year anniversary.
- A known expected date must be used.
- The deferral can end earlier if the event happens sooner.
- A later change needs a request to WRA.
Scroll down for the full analysis.
Read the original guidance here:
LTT deferral: choosing the expected end date
If part of the price for Welsh property may change later, you may be able to delay some Land Transaction Tax (LTT). LTT is Wales’s property tax. It is not stamp duty land tax (SDLT). The expected end date sets the planned end of that delay.
What this rule is about
Later events can alter some property payments. For example, a seller may receive more if planning permission is granted. Or future figures, still unknown, may determine the final amount.
The law describes these payments as contingent or uncertain. A contingent payment depends on an uncertain event. An uncertain payment has an amount that depends on future events.
You must base the date on when you expect the event to happen or, where the amount remains uncertain, when you expect to know it. Convenience is irrelevant.
What the official source says
The Welsh Government guidance explains how to set the expected end date in a request to defer LTT. The law sets the framework, and the guidance illustrates its operation in common situations.
- Use the expected event date for a contingent payment.
- Use that date when non-occurrence becomes clear.
- For an uncertain payment, use the date when you expect to work out its amount.
- If you cannot predict a date, use the fifth anniversary of the transaction’s effective date.
- If an agreed date changes and you cannot predict a new date, use the fifth anniversary of the previous expected end date.
The filing date for the first LTT return starts the deferral period. It ends when either date arrives first.
That final point is easy to overlook. A predicted date does not promise that the deferral will continue until then. If the payment becomes fixed earlier, the deferral period ends earlier.
What this means in practice
The expected end date controls deferred-tax timing. Once WRA agrees a deferral, you must pay the deferred amount before the end of the day after the deferral period ends, which is why choosing that date matters. Timing is strict.
- Choose a known future date where you can reasonably predict one.
- Do not use the five-year fallback merely because it gives more time.
- Use the five-year fallback only when you cannot predict the end date.
- Keep tracking the event after you file the return.
- Check whether WRA imposed payment conditions during the deferral period.
- Remember that WRA can set a different end date from the one requested.
If your deal includes a possible extra payment, check this point early. The payment clause may appear to be a contract detail. It affects LTT returns and payment timing.
How to analyse it
Start with the payment clause. Ask what must happen before anyone knows the final position.
- Is any part of the amount you pay contingent or uncertain?
- What event will trigger the payment, stop it, or fix its amount?
- Can you reasonably predict when that event will happen?
- If yes, what specific date do the deal and available evidence support?
- If no, what is the fifth anniversary of the effective date?
- Has WRA already agreed a deferral and set an expected end date?
- Have circumstances changed so that a variation should be requested?
- After a variation, if you cannot predict a new date, what date falls five years after the previous expected end date?
Explain the changed circumstances in any request to change the date. WRA may agree the request, but it may also set a different date. A request alone does not extend the deferral.
Example
In the official guidance, C Ltd had an effective date of 1 March 2020. It knew that a future payment could lead to more LTT, but it could not predict a due date for that payment. C Ltd therefore chose 1 March 2025. That date was the fifth anniversary of the effective date and its expected end date.
Suppose the relevant event still has not happened by then. C Ltd can ask WRA to vary the deferral. If it still cannot predict a date, the new expected end date is 1 March 2030: five years after the previous expected end date.
Compare that position with a deal in which the future event is expected on 31 August 2027 and, because that date can be predicted, the guidance requires you to use it even though it is more than five years after the effective date. The five-year fallback does not apply.
Why this can be difficult in practice
Prediction can be difficult in practice. The hard question is often whether you can really predict a date. A contract may set an outside deadline, yet that deadline does not always show when you will know the payment amount. The answer turns on the wording and the facts.
- An outside contractual deadline may differ from the expected date of the event.
- A hoped-for date is not necessarily a predictable date.
- The event may happen earlier than expected, ending the deferral early.
- A delay after the original request may need a variation rather than silence.
- Using five years despite having a known date does not follow the guidance or statutory rule.
- Changing the date is subject to WRA’s decision.
Keep the documents that explain your forecast. They may show why the original date was reasonable and why circumstances later changed.
Key takeaways
- Use the expected date when you will know the event or final amount.
- Use the five-year date only when you cannot predict that end date.
- Ask WRA to vary an agreed deferral if circumstances change.
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 19 — when part of the price depends on events
- LTTA 2017 section 20 — when the amount paid cannot yet be known
- LTTA 2017 section 57 — when land transaction tax normally must be paid
- LTTA 2017 section 58 — deferring tax on contingent or uncertain amounts
- LTTA 2017 section 61 — when deferred tax must be paid
- LTTA 2017 section 62 — changing an agreed deferral end 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
- Whether a future date can genuinely be predicted depends on the facts and the terms of the deal.
- The supplied guidance does not set out every document or fact WRA will expect when deciding whether a date is adequately supported.
- The supplied statutory bundle has no currency notice available to verify its current consolidation date. Current operation of the provisions should be checked before relying on this page for a new transaction.
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 contract and any agreement explaining the future payment.
- A clear account of the event that triggers, removes, or fixes the payment.
- Dates, forecasts, and supporting records showing why the proposed end date is expected.
- The original deferral decision and any conditions set by WRA.
- Evidence of a change in circumstances for any request to vary the date.
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 deferral: choosing the expected end date [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 19 - when part of the price depends on events https://www.legislation.gov.uk/anaw/2017/1/section/19 - LTTA 2017 section 20 - when the amount paid cannot yet be known https://www.legislation.gov.uk/anaw/2017/1/section/20 - LTTA 2017 section 57 - when land transaction tax normally must be paid https://www.legislation.gov.uk/anaw/2017/1/section/57 - LTTA 2017 section 58 - deferring tax on contingent or uncertain amounts https://www.legislation.gov.uk/anaw/2017/1/section/58 - LTTA 2017 section 61 - when deferred tax must be paid https://www.legislation.gov.uk/anaw/2017/1/section/61 - LTTA 2017 section 62 - changing an agreed deferral end date https://www.legislation.gov.uk/anaw/2017/1/section/62 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#5581 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 future date can genuinely be predicted depends on the facts and the terms of the deal. - The supplied guidance does not set out every document or fact WRA will expect when deciding whether a date is adequately supported. - The supplied statutory bundle has no currency notice available to verify its current consolidation date. Current operation of the provisions should be checked before relying on this page for a new transaction. 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 deferral: choosing the expected end date
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