Old Welsh leases that continue: stamp duty filing rules
In brief
A Welsh lease granted before 1 April 2018 can remain subject to stamp duty land tax if it continues after its fixed term and extra tax becomes due.
- Check the end date of each later one-year period.
- A return may be due within 30 days after that end date.
- Historic filing instructions should be checked against the current process.
Scroll down for the full analysis.
Read the original guidance here:
Old Welsh leases that continue: stamp duty filing rules
If your Welsh lease started before 1 April 2018 and carried on after its fixed end date, stamp duty land tax may still be relevant. What matters is not when the lease first began. It is the end of the later one-year period created by the rule.
What this rule is about
Land Transaction Tax began in Wales on 1 April 2018. Later Welsh tax issues may seem to fall automatically under Land Transaction Tax. For this narrow group of old leases, that is not right.
Official transitional guidance says a lease of Welsh land that began before that date stays in the stamp duty land tax system if extra tax becomes due after that date because the lease continued.
This matters because a lease can outlive the fixed term written in the original agreement. Tax rules add one year. If it continues again, the rules consider another year.
What the official source says
Under the source, tax rules count a continuing lease as lasting for the fixed term plus one year, and then for further one-year periods if needed. That treatment can make tax, or extra tax, due.
- If tax or extra tax becomes due, a return or further return is due within 30 days after the relevant one-year period ends.
- Use this rule only where the Welsh lease began before 1 April 2018.
- If the continuing lease becomes reportable for the first time, the source says to file a return in the usual way.
- For that first return, the source says Box 4 should show the final day of the one-year period that caused the reporting duty.
- For that historic return process, the source directs users to enter special code LA 6998, rather than a Welsh local-authority code.
- If the lease was already reported and extra tax later becomes due, the source says the taxpayer must notify Birmingham Stamp Taxes by letter.
“Reportable” simply means a transaction that must be notified to the tax authority. It does not explain the wider test for deciding whether a lease is reportable.
What this means in practice
Look beyond the date the lease was signed. Check whether it continued after its agreed fixed term. Then date every later one-year period.
That later end date can trigger a filing deadline. Missing it may create a late filing problem even though the lease itself began years earlier.
- Keep the original lease and any documents showing that occupation continued.
- Find any stamp duty land tax return filed when the lease began.
- Work out whether continuation caused tax or extra tax to become due.
- Use the end of the relevant one-year period when considering the 30-day deadline.
- Treat the source’s form code and postal instruction as historic guidance that needs checking before use.
How to analyse it
Ask the questions in this order. Each answer affects the next one.
- Is the land in Wales?
- Did the lease start before 1 April 2018?
- Did it continue after its fixed term ended?
- Which one-year period matters?
- Did treating the lease as longer cause tax, or more tax, to become due?
- Had the tenant already reported the lease to the tax authority?
- What is the final day of the relevant one-year period?
If the lease was never previously reported, the source gives one route. If it was already reported, it gives another. That distinction is easy to miss.
Example
Illustration: A lease of Welsh land began before 1 April 2018 and had a fixed term ending on 30 June 2018. The tenant stayed on. For this rule, the lease is treated as running for the original fixed term plus a further year, ending on 30 June 2019.
If that treatment means tax or extra tax is due, the official source says the return or further return is due within 30 days after 30 June 2019. The original start date does not set this particular deadline.
This example does not say that tax is due. The source does not provide enough detail to make that calculation.
Why this can be difficult in practice
Paperwork is often the difficult part. A lease may have continued informally, with no new document that clearly labels the extra period.
A later Welsh tax start date might seem to move an old lease automatically into Land Transaction Tax. For this continuing-lease situation, the official source says otherwise.
- People may use the original lease date instead of the later one-year end date.
- A missing earlier return can make it unclear which reporting route applies.
- The lease may have changed, ended, or been replaced rather than simply continued.
- Its form box, code and postal address may no longer be current.
- The source does not provide the calculation needed to decide whether extra tax is due.
This is historic transitional guidance. Check the current filing process before relying on its administrative directions.
Key takeaways
- An old Welsh lease can remain in the stamp duty land tax system after 1 April 2018.
- For a continuing lease, the end of the relevant extra year can set the 30-day deadline.
- Check whether the lease was reported before, because the source gives different reporting directions.
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 Schedule 17A para 3 — tax treatment of leases continuing after fixed terms; deadline for returns when lease tax changes
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 historic guidance may not show current forms, online filing arrangements, postal addresses, or administrative codes.
- The current status and wording of the transitional stamp duty land tax provisions were not available in the supplied statutory library.
- Whether a particular continuing lease becomes reportable, and whether extra tax is due, depends on facts and calculations not included in the source.
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 signed lease and any later agreement showing its fixed term and whether it continued.
- Dates for the end of each relevant one-year period.
- Any earlier stamp duty land tax return and proof of how it was filed.
- The calculation showing why tax or extra tax became due.
- Current confirmation of the correct filing method and contact details.
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 Old Welsh leases that continue: stamp duty filing rules [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 Schedule 17A para 3 - tax treatment of leases continuing after fixed terms https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/3/2025-11-17 - FA 2003 Schedule 17A para 3 - deadline for returns when lease tax changes https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/3/2025-11-17 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 - The supplied historic guidance may not show current forms, online filing arrangements, postal addresses, or administrative codes. - The current status and wording of the transitional stamp duty land tax provisions were not available in the supplied statutory library. - Whether a particular continuing lease becomes reportable, and whether extra tax is due, depends on facts and calculations not included in the source. 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: Old Welsh leases that continue: stamp duty filing rules
Search Land Tax Advice with Google
