Stamp duty where you move in before completion
In brief
A contract can trigger SDLT before legal completion if it is substantially performed. If the sale later completes, both stages are notifiable, but the later tax is only any extra amount.
- Check possession and pre-completion payments.
- Keep both SDLT calculations.
- Do not assume completion creates a full second tax bill.
Scroll down for the full analysis.
Read the original guidance here:
Stamp duty where you move in before completion
If, before legal completion, you move in, take most of the property, or pay most of the price, stamp duty may arise at that earlier stage even though the transfer has not yet completed. Completion may follow. You do not simply pay the same tax twice; the later bill covers only any increase.
What this rule is about
A contract usually leads to legal completion, but a deal can effectively have gone far enough before that point. The law describes this as substantial performance. At that earlier point, it treats the contract as a transaction.
Although there is one planned purchase, the timing can create two SDLT reporting events.
What the official source says
HMRC’s manual reflects section 44 of the Finance Act 2003. If a substantially performed contract is later completed by a conveyance, both the earlier stage and the completion stage are notifiable transactions.
- You take possession of all, or almost all, of the property; or
- You pay all, or almost all, of the amount due.
- Possession can include a right to receive rent.
- A temporary licence or lease can still count as possession.
- For a rent-only deal, the first rent payment can substantially perform the contract.
What this means in practice
A land transaction return is needed for each notifiable transaction. However, legal completion does not bring a second full SDLT charge. Tax is payable at completion only when that calculation produces more tax than the earlier contract calculation.
- Keep the earlier SDLT calculation and return.
- Check the tax calculation again at completion.
- Pay only the difference, if the later amount is higher.
How to analyse it
Look first at what happened before completion rather than relying only on the date shown on the transfer document. This is often missed.
- Was there a contract for a property purchase?
- Did you take possession before legal completion?
- Had you paid most of the price, or made the first rent payment?
- Did completion occur between the same parties and broadly follow that contract?
Example
Sam takes possession under a contract before legal completion. SDLT on the contract is calculated at £5,000. The sale later completes, and the SDLT calculation for that completed transaction is £6,500. Sam must report both stages. The tax due at completion is £1,500, not another £6,500.
Why this can be difficult in practice
The Land Registry completion date may seem like the only date that matters. It is not. Facts arising before that date may bring the SDLT point forward.
- “Almost all” of a property or payment is not given a fixed percentage here.
- Informal occupation can still matter.
- Agreements for lease can have different rules.
Key takeaways
- Moving in or paying most of the price can trigger SDLT early.
- Later completion can require a second return.
- Completion tax is limited to any increase over the earlier tax.
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 — contracts substantially performed before later completion
- FA 2003 section 76 — returns required for notifiable land transactions
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 possession is of the whole, or substantially the whole, of the property can depend on the facts.
- Whether an amount paid is substantially the whole of the amount due can also be fact-sensitive.
- The supplied legislation is current only to 17 November 2025. Current-law status should be checked for a transaction after that date.
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 completion documents.
- Dates and evidence of possession, including any right to receive rent.
- Evidence of payments made before completion.
- The SDLT return and tax calculation for the substantially performed contract.
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 Stamp duty where you move in before completion [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 - contracts substantially performed before later completion https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 76 - returns required for notifiable land transactions https://www.legislation.gov.uk/ukpga/2003/14/section/76/2025-11-17 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm08000 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 possession is of the whole, or substantially the whole, of the property can depend on the facts. - Whether an amount paid is substantially the whole of the amount due can also be fact-sensitive. - The supplied legislation is current only to 17 November 2025. Current-law status should be checked for a transaction after that date. 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 31 August 2026
Useful article? You may find it helpful to read the original guidance here: Stamp duty where you move in before completion
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