Non-resident SDLT surcharge: old contracts and transition rules
In short
An old property contract may be outside the non-resident SDLT surcharge, even if completion was after 1 April 2021. The answer depends on the exchange date and on whether the deal later changed.
- Check the contract date first.
- Review every later change and transfer of rights.
- Use HMRC’s return instructions only where the transition applies.
Scroll down for the full analysis.
Read the original guidance here:
Non-resident SDLT surcharge: old contracts and transition rules
Non-resident SDLT surcharge: old contracts and transition rules
The non-resident stamp duty surcharge began for relevant home purchases with an effective date on or after 1 April 2021. But a buyer may rely on transition rules to protect an older contract. The dates of exchange, later changes and any transfer of rights can decide the result.
What this rule is about
The government introduced the surcharge after some property deals had already been agreed. The transition rules prevent it from applying automatically to every old deal that completed after the start date.
That sounds simple. In practice, it is not always so.
The key date is usually the effective date: normally completion, but it can be earlier if a contract was substantially performed. For example, early possession or payment of nearly all the price can matter.
What the official source says
HMRC’s manual says that, where it applies, the non-resident surcharge covers home purchases with an effective date on or after 1 April 2021. It then describes two routes by which an earlier contract can fall outside the surcharge.
- A contract entered into and substantially performed before 1 April 2021 is protected.
- A contract entered into before 11 March 2020 can also be protected.
- The second route does not work if the deal is an excluded transaction.
- A contract change on or after 11 March 2020 can make it excluded.
- An assignment of rights under the contract on or after that date can also make it excluded.
- If a buyer uses an option, pre-emption right or similar right on or after that date, the same result can follow.
- A later assignment, sub-sale or similar arrangement may also end the protection if somebody else gains the right to call for the transfer.
What this means in practice
Do not look only at the completion date. With an old contract, first check when it was exchanged. Then check what happened to it afterwards.
For a contract made before 11 March 2020, HMRC’s examples include later changes to the property, the parties, the amount paid, or the length of a lease, any of which can become the point that matters most. The details matter.
- Keep the original signed contract and proof of its exchange date.
- Collect every variation, side letter and replacement agreement.
- Check whether anyone assigned rights or introduced a new buyer.
- Consider whether early possession or a major payment brought forward the effective date.
How to analyse it
Work through the dates in order. This avoids a common mistake: treating every old contract as protected without checking later events.
- Is the purchase one to which the non-resident surcharge would otherwise apply?
- What is its effective date?
- Was the contract both made and substantially performed before 1 April 2021?
- If not, was it made before 11 March 2020?
- After 11 March 2020, was the contract changed or were rights under it assigned?
- Did an option, pre-emption right, sub-sale or similar arrangement lead to the purchase?
- If the protection applies, does the SDLT return match HMRC’s manual instructions?
Example
Amir exchanged contracts to buy a flat on 5 March 2020. The deal completed after 1 April 2021. Nothing changed after exchange, and Amir did not assign his rights or use an option. On the facts given, the transition rule protects this type of old contract.
Now change one fact. If the parties made a material change to the flat or the price after 11 March 2020, the special protection may be lost. The size and effect of that change would need careful checking.
Why this can be difficult in practice
In practice, a contract can be edited through formal documents or informal arrangements in several ways without every alteration amounting to a variation that ends the protection. Some will not. HMRC treats a change to a prescribed colour scheme, or a simple move to the completion date, as potentially too minor. Its manual does not set a fixed line.
This is where the paperwork matters. Labels are secondary; the real question is what the parties agreed and the way it changed the deal.
- A new completion date does not automatically mean the contract was varied in a material way.
- A change of buyer, property or price is more likely to need close review.
- An arrangement can matter even where it is described as a sub-sale rather than an assignment.
- HMRC’s view on the SDLT return is guidance, not the law itself.
Key takeaways
- The surcharge started for relevant purchases with an effective date from 1 April 2021.
- Some contracts made before 11 March 2020 have transitional protection.
- Later changes, assigned rights and similar arrangements can remove that protection.
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
- FA 2003 section 44 — when a contract has been substantially performed
- FA 2003 section 75ZA — increased rates for non-resident land purchases
- FA 2003 section 119 — the effective date of a land purchase
- FA 2021 Schedule 16 para 6 — start date and transitional protection for surcharge
Official guidance
The pages below are HMRC’s guidance. Guidance is not law. It sets out how HMRC 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. HMRC can also change or withdraw guidance, and it may not cover your facts.
Where this is not settled
- Whether a later change is important enough to vary a contract depends on its facts.
- A change to a completion date or colour scheme may be too minor, but HMRC’s examples are not a complete legal test.
- The source does not explain how to decide whether a particular buyer is non-UK resident.
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 signed contract and exchange date.
- Evidence of any early possession or substantial payment.
- All later contract changes, side letters and transfer documents.
- Documents showing whether an option, pre-emption right, assignment or sub-sale was used.
- The SDLT return and the dates entered in it.
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 UK Stamp Duty Land Tax (SDLT), which applies in England and Northern Ireland. MY QUESTION Non-resident SDLT surcharge: old contracts and transition rules [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 - FA 2003 section 44 - when a contract has been substantially performed https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 75ZA - increased rates for non-resident land purchases https://www.legislation.gov.uk/ukpga/2003/14/section/75ZA/2025-11-17 - FA 2003 section 119 - the effective date of a land purchase https://www.legislation.gov.uk/ukpga/2003/14/section/119/2025-11-17 - FA 2021 Schedule 16 para 6 - start date and transitional protection for surcharge https://www.legislation.gov.uk/ukpga/2021/26/schedule/16/paragraph/6 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm09855 HOW I WANT YOU TO ANSWER 1. Work from the legislation above. Read it before answering. Guidance from HMRC 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 - Whether a later change is important enough to vary a contract depends on its facts. - A change to a completion date or colour scheme may be too minor, but HMRC's examples are not a complete legal test. - The source does not explain how to decide whether a particular buyer is non-UK resident. Do not give me a conclusion you cannot support from the provisions above.
Legislation links show Finance Act 2003 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 1 September 2026
Useful article? You may find it helpful to read the original guidance here: Non-resident SDLT surcharge: old contracts and transition rules
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