Before you file Land Transaction Tax online
Before filing online
Your organisation must be registered before it can use the Welsh online LTT filing service.
- Set up a personal login if needed.
- Check the property postcode if Wales is uncertain.
- Do not leave account access until the last minute.
Scroll down for the full analysis.
Read the original guidance here:
Before you file Land Transaction Tax online
Before you can file Land Transaction Tax, or LTT, online, your organisation needs access to the Welsh service. LTT is Wales’s stamp tax on land deals. Register first, then secure your login.
What this rule is about
Because online filing is carried out through an organisation rather than through a personal login alone, the organisation must be registered before a return can be submitted. This matters if a return is due soon. A missing account can hold up the person preparing the return.
What the official source says
The Welsh Government says you must register your organisation before you can use its online LTT filing service. It also gives routes for an existing organisation and for checking a postcode.
- Register your organisation before using the online service.
- Create a user account if your organisation is registered but you lack a login.
- Use the postcode checker if you need help deciding whether a postcode is in Wales for LTT.
What this means in practice
Do not wait until the return is ready to check access. First find out whether your organisation already has an account. Then make sure the person doing the filing has their own login.
- Ask whether the organisation has already registered.
- Set up a new user account where needed.
- Check the postcode early if the property’s location is unclear.
How to analyse it
Start with the practical questions, in order. The checker is a useful first step for a postcode. This short official page does not explain every location issue.
- Is the property postcode in Wales?
- Is the organisation already registered for online LTT filing?
- Does the person filing have their own user account?
Example
Although Sam works for a firm that has registered before, Sam has never used the service, so the firm does not need to register again. Sam needs a user account. Sam should create one, then can use that login when preparing the online filing.
Why this can be difficult in practice
Organisation registration is not personal access. They are not the same thing. A postcode check can help with location, but where the land involved raises wider questions, it is not a full review of that land. It has limits.
- An existing organisation account does not give every worker a login.
- A missing personal login can delay online filing.
- The source does not cover filing dates, payment or how to work out the tax.
Key takeaways
- Register the organisation before using the online service.
- Create your own login if the organisation is already registered.
- Use the postcode checker as an early location check.
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.
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
- A postcode checker can help with location, but this short source does not explain how it deals with unusual boundaries or land crossing a border.
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.
- Confirmation that the organisation is registered for the online LTT service.
- A working user login for the person who will file.
- The property postcode, where location in Wales needs checking.
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 Before you file Land Transaction Tax online [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.] Guidance page from the Welsh Revenue Authority on this topic (guidance, not law): https://www.gov.wales/file-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 - A postcode checker can help with location, but this short source does not explain how it deals with unusual boundaries or land crossing a border. 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: Before you file Land Transaction Tax online
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