LTT penalties for filing your Welsh property tax return late
Late LTT filing penalties
A required Welsh Land Transaction Tax return filed late may result in a £100 penalty. Further penalties can apply after six and twelve months, while interest continues on unpaid tax.
- Six and twelve month penalties are £300 or 5% of unpaid tax, if higher.
- Deliberately withholding relevant information can increase the penalty.
- Repeat late returns in the same penalty period may also increase penalties.
Scroll down for the full analysis.
Read the original guidance here:
LTT penalties for filing your Welsh property tax return late
LTT penalties for filing your Welsh property tax return late
If you file a required Land Transaction Tax return late after buying property in Wales, you may face a £100 penalty. Wait longer and the cost can rise. Daily interest also continues on tax you have not paid. LTT is the Welsh tax often compared with stamp duty.
What this rule is about
A return tells the Welsh Revenue Authority, or WRA, about a property transaction and the tax due. For a notifiable transaction, the buyer must make the return within 30 days beginning with the day after the effective date.
Late filing and late payment are separate problems. Sending the return late can bring a penalty. Leaving tax unpaid can also mean interest keeps building.
What the official source says
WRA says a required return sent after its filing date may result in a fixed £100 penalty. Further penalties may apply if the return remains outstanding for six months or more.
- Up to six months late: the penalty is £100.
- Between six and twelve months late, there is an extra £300, or, if 5% of unpaid tax is greater at that point, that higher amount. The comparison decides it.
- Twelve months late or more brings another £300, unless 5% of unpaid tax is greater at that point, in which case that higher amount applies. The higher figure wins.
- Daily interest continues throughout this period.
- Deliberately withholding helpful tax information can lead to a higher penalty.
- In that case, WRA says that a penalty of up to 95% of the tax due can result when helpful tax information is deliberately withheld. That is the stated maximum.
What this means in practice
Do not assume that filing the return eventually removes the problem, because the length of the delay and the tax still unpaid when the six-month and twelve-month points are reached both matter. Both must be considered.
This is the part people can miss: a late return may cost more even where the tax itself is not large.
- Check whether a return was required for your purchase.
- Find the filing date, rather than relying on an estimated deadline.
- Send the return as soon as possible if it is overdue.
- Check how much LTT remains unpaid.
- Keep records showing the information used in the return.
How to analyse it
Start with the date that matters for the transaction. Then compare the filing date with the date WRA received the return. Finally, check whether any tax remained unpaid at the later penalty points.
- Was this a notifiable Welsh land transaction?
- Was an LTT return required?
- What was the effective date of the transaction?
- What was the filing date?
- Was the return more than six months late?
- Was it more than twelve months late?
- How much tax was unpaid at each point?
- Was any relevant information deliberately withheld?
Example
Illustration: Megan files a required return seven months late. She has £8,000 of LTT still unpaid. The first penalty is £100. At six months, 5% of £8,000 is £400, which is more than £300. On these figures, the extra penalty is £400. Interest also continues while the £8,000 remains unpaid.
Why this can be difficult in practice
It may be unclear whether a return was required, especially where the transaction has unusual features. The dates also matter. A short delay past a six-month point can change the penalty position.
The official page also refers to increased penalties where more returns are filed late in the same penalty period, making the number of late returns relevant. That calculation is not explained on this page.
- Do not confuse the filing deadline with the date tax was paid.
- Do not assume £300 is always the later penalty.
- A 5% figure can be higher where unpaid tax is substantial.
- Deliberately withholding information can have much more serious consequences.
Key takeaways
- A late required LTT return may bring a £100 penalty.
- Further penalties can arise after six and twelve months.
- Interest continues on unpaid tax while it remains outstanding.
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 44 — duty and deadline for making an LTT return
- TCMA 2016 section 118 — fixed penalty for a late tax return
- TCMA 2016 section 119 — additional penalty after six months without a return
- TCMA 2016 section 120 — further penalty after twelve months without a return
- TCMA 2016 section 157 — interest on unpaid devolved tax
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 source does not explain how the penalty period is worked out or how increased penalties for repeat late returns are calculated.
- The source does not set out the detailed basis for calculating daily interest.
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 transaction’s effective date
- whether an LTT return was required
- the filing date for that return
- the date the return was actually sent
- the amount of LTT still unpaid at six and twelve months
- whether information was deliberately withheld
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 penalties for filing your Welsh property tax return late [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 44 - duty and deadline for making an LTT return https://www.legislation.gov.uk/anaw/2017/1/section/44 - TCMA 2016 section 118 - fixed penalty for a late tax return https://www.legislation.gov.uk/anaw/2016/6/section/118 - TCMA 2016 section 119 - additional 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 157 - interest on unpaid devolved tax https://www.legislation.gov.uk/anaw/2016/6/section/157 Guidance page from the Welsh Revenue Authority on this topic (guidance, not law): https://www.gov.wales/ltt-ldt-tax-penalties-guide#29383 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 source does not explain how the penalty period is worked out or how increased penalties for repeat late returns are calculated. - The source does not set out the detailed basis for calculating daily interest. 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 penalties for filing your Welsh property tax return late
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