Land Transaction Tax: late return costs £100, then £300 or 5% after six and 12 months
Late return penalties at a glance
A missed LTT or LDT return can bring a £100 penalty immediately, followed by larger penalties if it remains outstanding.
- Most LTT returns are due within 30 days of completion.
- Six- and 12-month penalties use £300 or 5% of unpaid tax, whichever is higher.
- LDT has higher penalties for repeated missed returns.
Scroll down for the full analysis.
Read the original guidance here:
Land Transaction Tax: late return costs £100, then £300 or 5% after six and 12 months
Land Transaction Tax: late return costs £100, then £300 or 5% after six and 12 months
Missing an LTT return deadline can bring a £100 penalty straight away. LTT is the Welsh land tax that many people call stamp duty. If the return is still missing, the bill can rise sharply after six and twelve months.
What this rule is about
These penalties apply when someone required to make a Welsh tax return does not do so on time. They cover Land Transaction Tax (LTT) and landfill disposals tax (LDT).
For most property purchases, the LTT return is due within 30 days of the effective date. Usually, that is completion day. So the deadline is close, even when everything else about the move feels finished.
A late return is a different issue from late payment. This page concerns failure to send the return. Any unpaid tax still matters because it can increase later penalties.
What the official source says
The Welsh Revenue Authority (WRA) says a person required to make a return gets a £100 penalty if it is not made by the filing date. It then sets out further penalties where the failure continues.
- At one day late, the penalty is £100.
- Once a return is six months late, a further penalty is due of £300 or 5% of unpaid tax, whichever is higher, if the unpaid amount makes that percentage larger.
- At 12 months late, another penalty applies: £300 or 5% of unpaid tax, whichever is higher.
- If information was withheld that would have helped the WRA assess Welsh tax, the 12-month penalty can be higher than the usual amount.
- It is at least £300 and can be up to 95% of the tax that would have been due.
- According to the source, a penalty must normally be paid within 30 days from the date on its notice.
Where a person later provides information that was withheld because the return was missed, the WRA may reduce the penalty after considering that information and the circumstances. A reduction is not promised.
What this means in practice
Completion is not the last tax task for an LTT purchase. The return deadline normally runs from that date. Even a return that is one day late can bring the £100 penalty.
The six-month point is where a small delay can become expensive. Where tax remains unpaid, 5% may exceed £300. The larger figure is used.
- Keep a record of the completion date and the date the return was sent.
- Check whether a return was required, rather than assuming someone else sent it.
- Read any WRA penalty notice carefully, including its issue date.
- Check whether the missing return would show unpaid tax.
- Do not hold back information that would help the WRA work out the tax.
LDT follows a separate pattern. Repeated missed LDT returns within a penalty period attract higher fixed penalties. Those rules are not an extra charge for a late LTT property return.
How to analyse it
Begin with the return itself. Then work forwards from its deadline. That order avoids confusing a late return with a late tax payment.
- Was a return required for the transaction or accounting period?
- What was its filing date?
- When, if at all, did the WRA receive it?
- Has six months passed after the filing date?
- Has 12 months passed after the filing date?
- What tax would have remained unpaid if the return had been made?
- Was useful information withheld from the WRA?
- For LDT, were earlier missed returns within the same penalty period?
What is the key date for an LTT return? Usually, it is completion. The law sets the deadline as 30 days beginning with the day after the effective date, and the effective date is normally completion.
Example
Company A has an LDT return due on 31 July 2018 but does not send it. The WRA charges £100. Its penalty period starts on 1 August 2018 and would end on 31 July 2019.
It then misses another return for the period ending 31 December 2018. Because that second failure falls inside the existing penalty period, the source says the penalty is £200. The period is extended to 31 January 2020.
If Company A misses a third return within that period, the penalty is £300. A fourth and later failure within the period each lead to a £400 penalty.
Why this can be difficult in practice
Many people focus on the first £100 and overlook the later dates. That is the costly mistake. A missing return can trigger a penalty at once, followed by further penalties as time passes.
Calculating the higher penalty also needs care. You need the unpaid tax figure because the rule compares 5% with £300. It does not simply add both amounts together.
- A return may be prepared but never actually sent.
- The effective date may not always be completion where a special rule applies.
- The higher 95% limit depends on withheld information and the tax that would have been due.
- An LDT penalty period can be extended by a further missed return.
- A request for a review or an appeal changes the payment position described in the official source.
Key takeaways
- A required Welsh tax return that is late can trigger a £100 penalty.
- Further penalties can apply after six months and again after 12 months.
- For most LTT purchases, count the 30-day filing period from completion.
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
- TCMA 2016 section 118 — initial penalty for a missed tax return
- TCMA 2016 section 119 — further penalty after six months without a return
- TCMA 2016 section 120 — further penalty after twelve months without a return
- TCMA 2016 section 121 — higher penalties for repeated landfill tax failures
- TCMA 2016 section 125 — WRA power to reduce certain penalties
- TCMA 2016 section 154 — time limit for paying a penalty
- TCMA 2016 section 182 — payment of penalties during reviews and appeals
- LTTA 2017 section 44 — duty and deadline for making an LTT return
- LTTA 2017 section 71 — effective date usually being the completion 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 contains amendments to the relevant TCMA provisions, rather than the full current text of each provision. The current wording should be checked before relying on a point affected by later change.
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 date the return was due
- the date the WRA received the return
- any unpaid tax shown by the missing return
- the penalty notice and its issue date
- information withheld and the date it was later disclosed
- for LDT, dates of earlier missed returns
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 Late Welsh tax returns: penalties for missing the deadline [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 - TCMA 2016 section 118 - initial penalty for a missed tax return https://www.legislation.gov.uk/anaw/2016/6/section/118 - TCMA 2016 section 119 - further penalty after six months without a return https://www.legislation.gov.uk/anaw/2016/6/section/119 - TCMA 2016 section 120 - further penalty after twelve months without a return https://www.legislation.gov.uk/anaw/2016/6/section/120 - TCMA 2016 section 121 - higher penalties for repeated landfill tax failures https://www.legislation.gov.uk/anaw/2016/6/section/121 - TCMA 2016 section 125 - WRA power to reduce certain penalties https://www.legislation.gov.uk/anaw/2016/6/section/125 - TCMA 2016 section 154 - time limit for paying a penalty https://www.legislation.gov.uk/anaw/2016/6/section/154 - TCMA 2016 section 182 - payment of penalties during reviews and appeals https://www.legislation.gov.uk/anaw/2016/6/section/182 - LTTA 2017 section 44 - duty and deadline for making an LTT return https://www.legislation.gov.uk/anaw/2017/1/section/44 - LTTA 2017 section 71 - effective date usually being the completion 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/tax-collection-and-management-wales-act-2016-penalties-technical-guidance#6515 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 contains amendments to the relevant TCMA provisions, rather than the full current text of each provision. The current wording should be checked before relying on a point affected by later change. 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: Land Transaction Tax: late return costs £100, then £300 or 5% after six and 12 months
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