Further late payment penalties for Welsh land transaction tax
Further late payment penalties
Welsh land transaction tax left unpaid may attract a further 5% penalty at six months and another 5% at 12 months.
- Each penalty is based on the unpaid balance.
- Interest keeps running while tax is unpaid.
- Payment records and penalty dates matter.
Scroll down for the full analysis.
Read the original guidance here:
Further late payment penalties for Welsh land transaction tax
Further late payment penalties for Welsh land transaction tax
If Welsh land transaction tax remains unpaid, the bill can increase twice more: another 5% at six months and a further 5% at 12 months.
Interest also continues to run. This is a late-payment penalty, not a new stamp duty rate.
What this rule is about
These charges apply when tax stays unpaid for a long time. They make it more expensive to leave a tax bill outstanding. A longer delay can increase the amount the authority adds.
What the official source says
The Welsh Revenue Authority guide identifies two further late-payment penalties. The legislation sets the legal rule. The guide explains that the authority calculates each extra penalty from the tax still unpaid.
- An earlier late-payment penalty must already apply.
- At the six-month point, an extra 5% is charged on unpaid tax.
- At the 12-month point, another 5% is charged on unpaid tax.
- Daily interest continues throughout the unpaid period.
What this means in practice
When you pay part of the bill, you can reduce a later penalty because the authority calculates the charge from the amount that remains unpaid. It does not remove interest already running on the unpaid amount.
- Check the unpaid balance before each penalty point.
- Keep proof of every payment you make.
- Read any penalty notice alongside your payment record.
How to analyse it
Start with the amount of tax due. Then work forward through the payment history. The balance left at each stage matters.
- Identify the relevant penalty date.
- Check whether the first late-payment penalty applies.
- Work out the unpaid amount at six months.
- Work out the unpaid amount at 12 months.
Example
Rhodri has £10,000 of Welsh land transaction tax unpaid at the six-month point. The further penalty is £500.
If Rhodri still owes the full £10,000 at the 12-month point, having made no payment between the six-month point and that later date, the authority adds a second £500 penalty. Daily interest continues as well.
If he pays some tax before the later point, the authority calculates that later 5% charge only from the amount left.
Why this can be difficult in practice
Many people focus only on the original bill. That is the mistake. A part-payment changes the later penalty figure, but it may not prevent a penalty that the authority has already triggered.
- The interest rate is not given in the source.
- The dates need checking against the relevant penalty date.
- Penalty and interest figures may be shown separately on a notice.
Key takeaways
- Unpaid tax can lead to two further 5% penalties.
- Each charge uses the balance still unpaid.
- Interest continues while tax remains unpaid.
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 122 — initial penalty for unpaid devolved tax
- TCMA 2016 section 122A — further penalties for continuing late tax payment
- TCMA 2016 section 157 — late payment interest on 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.
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 amount of tax still unpaid at each penalty point
- The relevant penalty date and payment records
- Any Welsh Revenue Authority notice showing penalties or interest charged
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 Further late payment penalties for Welsh land transaction tax [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 122 - initial penalty for unpaid devolved tax https://www.legislation.gov.uk/anaw/2016/6/section/122 - TCMA 2016 section 122A - further penalties for continuing late tax payment https://www.legislation.gov.uk/anaw/2016/6/section/122A - TCMA 2016 section 157 - late payment interest on 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 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. 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: Further late payment penalties for Welsh land transaction tax
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