Linked LTT purchases: what happens when you buy a third property?
Linked purchases can change earlier LTT bills
When a third purchase links to two earlier ones, LTT is recalculated using the combined price of all three. The resulting tax is then split by price.
- A later purchase can trigger further returns for earlier purchases.
- Earlier payments reduce the extra amount due.
- Check the source illustration’s transaction labels carefully.
Scroll down for the full analysis.
Read the original guidance here:
Linked LTT purchases: what happens when you buy a third property?
Linked LTT purchases: what happens when you buy a third property?
When a third linked property is bought, the Land Transaction Tax (LTT) due on two earlier purchases can change. In Wales, Land Transaction Tax replaced stamp duty land tax in 2018. Across all linked purchases, the tax is calculated and then divided between them.
What this rule is about
Buying several properties under one wider deal can produce a higher LTT bill than looking at each purchase alone. This is because the law treats linked purchases as parts of one overall arrangement.
Where a later purchase forms part of the same arrangement, it can require the tax on an earlier purchase to be revisited even after a return and payment have been made. Extra returns and extra payment may follow.
What the official source says
In the official example, A Ltd makes three linked purchases. They cost £500,000, £350,000 and £1,100,000. Together, that is £1,950,000.
For that total, the source gives LTT of £95,500. It then shares that amount between the three purchases according to each purchase price.
- The £1,100,000 third purchase represents 22/39 of the total.
- The £500,000 purchase represents 10/39 of the total.
- The £350,000 purchase represents 7/39 of the total.
- The third purchase has tax of £53,871.79 in the illustration.
- The other two shares are £24,487.17 and £17,141.02 before final penny adjustments.
Under the law, the same method applies. First calculate tax on the total amount paid across the linked purchases. Then multiply that figure by each purchase’s share of the total.
What this means in practice
In practice, rather than calculating tax on the third property alone, you must recalculate the entire linked group because the later purchase can place more of the total in higher tax bands. Recalculate the whole group.
A Ltd had already paid tax for the first two purchases. The source therefore deducts those earlier payments from the revised bills. A Ltd pays only the extra amount now due.
- For one earlier purchase, the source gives a revised bill of £24,487.18.
- It says £18,235.29 had already been paid for that purchase.
- The extra payment shown is £6,251.89.
- For the other earlier purchase, the source gives a revised bill of £17,141.03.
- It says £12,764.71 had already been paid there.
- The extra payment shown is £4,376.32.
According to the source, A Ltd must submit a return for the third purchase. It must also submit two further returns for the earlier purchases. In the illustration, all returns and payments fall due by 1 December 2020.
How to analyse it
Begin with the relationship between the purchases. Do they form one scheme, arrangement or series? What matters is that wider link, rather than simply buying more than one property.
- List every purchase that may be part of the same deal.
- Check who bought and sold each property.
- Check whether any buyer or seller is connected to another.
- Add the amounts paid for all linked purchases.
- Calculate LTT on that combined total.
- Divide the total tax by each purchase’s share of the combined price.
- Compare each revised amount with tax already paid.
- Check whether the later purchase triggers further returns for earlier purchases.
Do not ignore the timing point. If a later linked purchase creates extra tax on an earlier one, the deadline runs from the later purchase’s effective date under the statute.
Example
Using the official figures, the three linked purchases total £1,950,000. Because the third costs £1,100,000, its fraction is £1,100,000 divided by £1,950,000: 22/39. Multiplying £95,500 by 22/39 gives £53,871.79.
That calculation does not mean the other purchases keep their original tax bills. Their shares must also be recalculated using the same £95,500 total. Although earlier payments reduce the extra cash now payable, they do not remove the need to correct the position when the linked purchases have been recalculated. The position still needs correction.
Why this can be difficult in practice
Most buyers focus on the new property. That is not enough here. A harder question is whether all the purchases belong to one wider arrangement.
Care is also needed with the official illustration, because its later figures label the earlier transactions differently from the fractions shown earlier, so the prices, fractions, earlier returns and payments must be matched before submitting a return. Check them carefully.
- Separate contracts can still be linked purchases.
- Buying on different dates does not by itself prevent a link.
- Earlier tax payments do not settle the final position if a later purchase changes it.
- Small rounding differences can arise when splitting tax between purchases.
- The 2020 date in the example is not a safe deadline for a new purchase.
Key takeaways
- A later linked purchase can increase LTT on earlier purchases.
- Calculate tax on the combined price, then split it between the purchases.
- Check earlier returns and payments before working out what remains due.
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 8 — when land purchases count as linked transactions
- LTTA 2017 section 28 — how to calculate tax on linked transactions
- LTTA 2017 section 44 — when a buyer must send an LTT return
- LTTA 2017 section 51 — further returns after a later linked purchase
- LTTA 2017 section 57 — when tax due with a return must be paid
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.
- Welsh Revenue Authority technical guidance, LTTA/3030 Transaction 3
Where this is not settled
- The source gives fractions that match £500,000 and £350,000, but later appears to attach the resulting revised tax figures to the earlier transactions in the opposite order. The actual facts and earlier returns should be checked before using those labels.
- The supplied source illustrates a 2020 deadline. It should not be used alone to confirm a deadline for a current purchase.
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.
- Contracts and completion dates for all three purchases.
- The buyers, sellers and any links between them.
- The amount paid for each purchase, excluding any rent.
- Copies of the earlier LTT returns and proof of tax already paid.
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 Linked LTT purchases: what happens when you buy a third property? [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 8 - when land purchases count as linked transactions https://www.legislation.gov.uk/anaw/2017/1/section/8 - LTTA 2017 section 28 - how to calculate tax on linked transactions https://www.legislation.gov.uk/anaw/2017/1/section/28 - LTTA 2017 section 44 - when a buyer must send an LTT return https://www.legislation.gov.uk/anaw/2017/1/section/44 - LTTA 2017 section 51 - further returns after a later linked purchase https://www.legislation.gov.uk/anaw/2017/1/section/51 - LTTA 2017 section 57 - when tax due with a return must be paid https://www.legislation.gov.uk/anaw/2017/1/section/57 Guidance page from the Welsh Revenue Authority on this topic (guidance, not law): https://www.gov.wales/calculation-land-transaction-tax-payable-technical-guidance#6944 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 source gives fractions that match £500,000 and £350,000, but later appears to attach the resulting revised tax figures to the earlier transactions in the opposite order. The actual facts and earlier returns should be checked before using those labels. - The supplied source illustrates a 2020 deadline. It should not be used alone to confirm a deadline for a current purchase. 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 4 September 2026
Useful article? You may find it helpful to read the original guidance here: Linked LTT purchases: what happens when you buy a third property?
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