Guide to Pre-Completion Transactions Under Section 45 and Schedule 2A FA 200

Pre-completion transactions for Welsh land: when LTT applies instead of SDLT

If a buyer passes on, assigns or restructures rights under a land contract for property in Wales before completion or substantial performance, the tax treatment may move from SDLT to LTT. In general, where the later arrangement is completed or substantially performed by the new buyer on or after 1 April 2018, the pre-completion transaction is dealt with under the Welsh LTT rules, not SDLT, even if the original contract started under the SDLT regime.

• A pre-completion transaction happens when the original buyer enters into a further arrangement before completion or substantial performance, giving another person the right to require transfer of all or part of the land.
• This can include an assignment of rights, a sub-sale or another stand-alone arrangement with the same legal effect.
• If the later arrangement is completed or substantially performed on or after 1 April 2018, SDLT generally does not apply to that later transaction; LTT does instead.
• Older SDLT transitional protection will usually not help unless the original contract was substantially performed on or before 17 December 2014.
• The legal effect of the documents and the timing of completion or substantial performance are critical in deciding which tax regime applies.
• Any available reliefs should be checked under Schedule 2 to the Welsh Act, especially paragraphs 18 and 19, rather than relying only on SDLT rules.

Scroll down for the full analysis.

Pre-completion transactions: when an SDLT contract is instead dealt with under LTT

This page explains what happens when a land contract is passed on or restructured before it is completed, and the land is in Wales. These arrangements are often called pre-completion transactions. They matter because the tax treatment can shift away from SDLT and into LTT, even if the original contract was entered into under the SDLT regime.

What this rule is about

A pre-completion transaction arises where there is an original contract for a land transaction, but before that original contract is completed or substantially performed, the original buyer enters into a further arrangement so that someone else becomes entitled to call for the transfer of all or part of the land.

In practice, this can happen in several ways. The source material mentions:

• an assignment of the buyer’s rights under the original contract
• a sub-sale
• another stand-alone arrangement that gives a different person the right to require the transfer

The key point is that the original buyer is no longer the only person relevant to completion. A second transaction intervenes before the first one is completed or substantially performed.

What the official source says

The source refers to section 45 and Schedule 2A of Finance Act 2003, which are the SDLT rules dealing with pre-completion transactions.

It says that where:

• there is a contract intended to be completed by a conveyance, and
• before that contract is substantially performed or completed, the original purchaser enters into a further agreement, and
• that further agreement gives another person the right to call for the conveyance of all or part of the land,

the arrangement falls within the pre-completion transaction rules.

The source then states that if the assignment or other free-standing transaction is completed or substantially performed by the transferee on or after 1 April 2018, SDLT does not apply to:

• the completion of the assignment or free-standing transaction, or
• a transaction or notional transaction entered into by the transferor

Instead, those matters fall within LTT.

The source also says that the Wales Act 2014 transitional rules in section 16(5) and (6) will generally not preserve SDLT treatment in these circumstances, unless the original contract was substantially performed on or before 17 December 2014. The reason given is that the later assignment of rights or free-standing transaction takes the case outside those transitional rules by virtue of section 16(6).

Finally, the source says that Schedule 2 to the Land Transaction Tax and Anti-avoidance of Devolved Taxes (Wales) Act contains the Welsh rules for pre-completion transactions, operating in the same way as the SDLT rules in force when the guidance was published. Any relief relevant to an assignment of rights, sub-sale or other free-standing transaction is found in paragraphs 18 and 19 of that Schedule.

What this means in practice

If land in Wales is being acquired through a chain of contractual steps before completion, you should not assume the tax position stays within SDLT just because the original contract began there.

Where the later arrangement is completed or substantially performed on or after 1 April 2018, the source makes clear that the later pre-completion transaction is dealt with under LTT, not SDLT.

This matters because:

• the filing and payment obligations may arise under the Welsh regime rather than the UK SDLT regime
• the relevant relieving provisions are the LTT rules in Schedule 2 to the Welsh Act, not the SDLT provisions alone
• you need to identify who the transferee is, what rights they acquired, and when the later arrangement was completed or substantially performed

The source also signals that transitional protection is narrow. If someone is trying to argue that an older contract should remain within SDLT because it predates the start of LTT, that argument will usually fail where there has been an assignment of rights or similar pre-completion transaction, unless the original contract had already been substantially performed on or before 17 December 2014.

How to analyse it

A sensible way to analyse this issue is to ask the following questions in order.

• Is there an original land contract that was to be completed by conveyance?
• Before that original contract was completed or substantially performed, did the original purchaser enter into another agreement?
• Did that later agreement give another person the right to call for the transfer of all or part of the land?
• Is the later arrangement an assignment, a sub-sale, or another free-standing transaction of the kind covered by the pre-completion rules?
• When was that later arrangement completed or substantially performed by the transferee?
• If that happened on or after 1 April 2018, does the Welsh LTT regime apply instead of SDLT?
• Is anyone relying on transitional treatment, and if so, was the original contract substantially performed on or before 17 December 2014?
• Do any of the specific relief provisions in Schedule 2 to the Welsh Act need to be considered?

This framework is important because the tax result depends heavily on timing and on the legal effect of the later agreement. The label used by the parties is less important than whether another person has become entitled to require the conveyance.

Example

Illustration: A agrees to buy Welsh land from B under a contract that has not yet been completed and has not been substantially performed. Before completion, A enters into a further agreement with C under which C becomes entitled to call for the transfer of the land from B. If that later arrangement is completed or substantially performed by C on or after 1 April 2018, the source indicates that the relevant pre-completion transaction is not charged under SDLT. It falls to be dealt with under LTT instead.

If A argued that the original contract should stay within SDLT because it was made before LTT began, that argument would usually not succeed under the transitional rules unless the original contract had already been substantially performed on or before 17 December 2014.

Why this can be difficult in practice

The difficult part is often identifying exactly what the parties have done in legal terms.

A transaction may not be described as an assignment or sub-sale, but still have the effect of giving another person the right to call for the conveyance. The source makes clear that a free-standing transaction can also be enough. That means the documents must be read for their legal effect, not just their heading.

Timing also matters. The source draws a sharp distinction based on whether the later arrangement is completed or substantially performed on or after 1 April 2018. It also preserves a narrow exception where the original contract was substantially performed on or before 17 December 2014. In real transactions, establishing those dates accurately may be essential.

Another practical difficulty is that the source points to reliefs in the Welsh legislation but does not set them out in detail. So identifying that a case is a pre-completion transaction is only the first step. The next step is to consider whether paragraphs 18 or 19 of Schedule 2 to the Welsh Act affect the tax result.

Key takeaways

• If a buyer passes on or restructures rights under a land contract before completion or substantial performance, the pre-completion transaction rules may apply.
• For Welsh transactions completed or substantially performed by the transferee on or after 1 April 2018, the source says the relevant charge is under LTT rather than SDLT.
• Transitional SDLT treatment is usually excluded in these cases unless the original contract was substantially performed on or before 17 December 2014.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Guide to Pre-Completion Transactions Under Section 45 and Schedule 2A FA 200

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