Guidance on SDLT for Non-Resident Transactions: Contract Completion and Substantial Performance

SDLT non-resident surcharge when a contract is substantially performed before completion

If a property contract is substantially performed before legal completion, the key date for the SDLT non-resident surcharge is the date of substantial performance, not the later completion date. Where the later conveyance is also chargeable, it follows the residence outcome already fixed at the earlier stage.

• Substantial performance can bring an SDLT charge forward before legal title is formally transferred.
• For the non-resident surcharge, the buyer’s residence status is tested when substantial performance happens.
• If the transaction is later completed by conveyance, the residence position is not tested again at completion.
• Where section 44(8) Finance Act 2003 applies, the later completion is a non-resident transaction only if the earlier substantial performance transaction was non-resident.
• In practice, it is important to identify whether substantial performance has occurred, the exact date, and the buyer’s residence status at that time.
• Common difficulty arises because people often assume residence is tested on legal completion, but this rule makes the earlier substantial performance date decisive.

Scroll down for the full analysis.

SDLT non-resident surcharge where a contract is substantially performed before completion

This page explains how the SDLT non-resident surcharge works if a land contract is substantially performed before the formal transfer is completed. The key point is that, for surcharge purposes, residence is tested when substantial performance happens, not again when the later conveyance is completed.

What this rule is about

Under SDLT, a land transaction is not always taxed only when legal title is formally transferred. In some cases, the contract is treated as taking effect earlier because it has been substantially performed. Broadly, substantial performance is an SDLT concept that can bring the transaction into charge before completion.

This matters because the non-resident surcharge depends on whether the transaction is a non-resident transaction. If there is an earlier substantial performance event and a later completion by conveyance, the law needs a clear rule for deciding when residence is tested.

What the official source says

The HMRC manual says that where a contract is substantially performed before completion, and the same transaction is later completed by a conveyance, both stages are notifiable transactions for SDLT.

It then states the specific rule for the non-resident surcharge: residence is tested at the date of substantial performance of the contract.

The manual also says that if the later completion is itself a chargeable notifiable transaction under section 44(8) Finance Act 2003, that later transaction is a non-resident transaction if and only if the earlier substantial performance was a non-resident transaction.

In other words, the later completion follows the residence result already established at the substantial performance stage. The residence position is not re-tested afresh at completion for this purpose.

What this means in practice

If a buyer takes possession early, or otherwise substantially performs the contract before legal completion, SDLT may arise at that earlier point. For the non-resident surcharge, the important date is that earlier date.

This can affect the amount of SDLT due. A buyer who is non-resident at the substantial performance date may be within the surcharge, even if they are resident by the time the conveyance is completed. Equally, if the transaction was not a non-resident transaction at substantial performance, the later completion does not become a non-resident transaction just because the buyer’s residence status has changed by completion.

The practical consequence is that anyone dealing with an early possession or similar arrangement should identify whether substantial performance has occurred and, if so, record the buyer’s residence position at that time. That date may control the surcharge outcome for both the initial SDLT treatment and the later completion stage.

How to analyse it

A sensible way to approach the issue is:

• First, ask whether there is a contract that was substantially performed before formal completion.
• Second, identify the date of substantial performance. That is the critical date for testing residence for surcharge purposes.
• Third, decide whether the transaction at that date was a non-resident transaction under the relevant surcharge rules.
• Fourth, check whether the later conveyance falls within section 44(8) Finance Act 2003 as a later chargeable notifiable transaction.
• Finally, carry the earlier residence result through to the later completion. The later transaction is treated as a non-resident transaction only if the earlier substantial performance transaction was one.

This is a timing rule. It does not create a new residence test for completion. It tells you which earlier point controls the surcharge analysis.

Example

Illustration: a buyer exchanges contracts to buy a property, is allowed into possession before legal completion, and that early possession amounts to substantial performance for SDLT purposes. Legal completion then takes place some months later by conveyance.

For the non-resident surcharge, the buyer’s residence status is tested when substantial performance occurred. If the buyer was non-resident at that earlier date, the later completion is treated as a non-resident transaction if section 44(8) applies. If the buyer later becomes UK resident before completion, that later change does not alter the surcharge result for the completed transaction.

Why this can be difficult in practice

The main difficulty is often not the residence rule itself, but identifying whether substantial performance has actually happened, and on what date. That can be fact-sensitive.

The source material points readers to HMRC’s general guidance on contracts and substantial performance. That is important because the surcharge rule here depends on the transaction having crossed that threshold before completion.

Another practical difficulty is that people may assume the later completion date is the obvious date for testing residence because that is when legal title passes. This rule says otherwise. Where section 44(8) applies, the later completion follows the earlier substantial performance result.

It is also important not to confuse HMRC’s manual with the legislation itself. The manual explains HMRC’s view of how paragraph 17 of Schedule 9A to Finance Act 2003 operates alongside the contract rules in section 44. The legal effect ultimately depends on the legislation applied to the facts.

Key takeaways

• If a contract is substantially performed before completion, SDLT can be engaged at that earlier stage as well as on later completion.
• For the non-resident surcharge, residence is tested at the date of substantial performance, not re-tested at completion.
• Where the later completion is chargeable under section 44(8), it is a non-resident transaction only if the earlier substantial performance transaction was one.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Guidance on SDLT for Non-Resident Transactions: Contract Completion and Substantial Performance

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