When stamp duty can start before you complete a property purchase
When the SDLT date can change
Completion usually sets the SDLT date. Early possession or payment of substantially all the amount due can mean the contract counts earlier.
- This HMRC page is a contents page for related guidance.
- Options and rights of first refusal have separate rules.
- The agreement and the facts before completion are crucial.
Scroll down for the full analysis.
Read the original guidance here:
When stamp duty can start before you complete a property purchase
When stamp duty can start before you complete a property purchase
Stamp duty land tax usually looks to the day you complete your property purchase. That date does not always control, however.
If you take possession early or pay almost all the price early, SDLT can instead treat the contract as having happened at that earlier point.
What this rule is about
For SDLT, the date that counts is called the effective date. It matters because tax rules, reliefs and rates can depend on that date.
Most people assume that the date is always the completion date. Usually, it is.
The law has special rules for some contracts, options and rights of first refusal.
This HMRC page mainly serves as a signpost. It lists the manual sections covering those situations and directs readers elsewhere for the governing rules.
It neither creates a new tax rule nor calculates the tax due.
What the official source says
HMRC’s contents page directs readers to guidance on the effective date, contracts completed in the normal way, and contracts acted on before completion.
It also points to topics that may affect SDLT timing or the rate rules that apply. Those links identify related issues.
- The usual effective date is completion.
- A contract completed without earlier substantial performance is treated as one transaction.
- Taking possession before completion can amount to substantial performance.
- Paying substantially all the amount due can also amount to substantial performance.
- A later completion can create a further notifiable transaction after earlier substantial performance.
- If a substantially performed contract later ends, the legislation provides for repayment through an amendment to the return for that contract.
- Options and rights of first refusal have their own effective-date rule.
- The page directs readers to HMRC material on conditional contracts and higher-rate SDLT topics.
The key idea is “Substantial performance”. In everyday terms, it asks whether the deal has been carried out to a significant extent, despite legal completion not having happened.
For possession, the law treats a person as possessing the property where they receive rent from it, or have the right to receive that rent, whatever route led to possession. A temporary licence or lease can be that route.
What this means in practice
If you move in, gain control of the property, or pay nearly all the price before completion, do not assume SDLT can wait until completion.
The earlier event may set the relevant date.
That distinction can have a real effect. Moving the effective date can bring a different version of the SDLT rules into play.
- Keep a clear record of when you received keys or access.
- Check whether you could occupy the property before completion.
- Check whether you could collect rent before completion.
- Record every payment made before completion.
- Read any licence, lease or side agreement alongside the main contract.
- Do not treat an option as tax-free simply because no purchase has completed.
The page also points to separate material on higher rates for some home purchases, certain company or similar buyers, and non-resident transactions.
Those are separate subjects. A contents page cannot decide whether one applies to you.
How to analyse it
Examine the deal you actually have, not the label attached to it. Calling an arrangement a licence, deposit or early access agreement does not settle the SDLT position.
- Identify the contract, option or other right that was granted.
- Find the planned completion date.
- Ask whether completion happened before anything else significant.
- If not, ask when you first took possession of all or most of the property.
- Check whether you received, or could receive, rent.
- Work out what proportion of the amount due had been paid by each date.
- Check whether the contract was later completed, cancelled or changed.
- Then identify the SDLT rules in force on the effective date found.
What actually decides it? Often, it is the timing of access and payment.
What the parties expected the tax result to be carries less weight than the paperwork and bank records.
Example
Amir signs a contract to buy a flat. Completion is planned for later.
Before then, the seller lets Amir move in and gives him control of the whole flat. Formal completion has not yet occurred.
Amir’s early possession and control of the whole flat may mean that the contract has been substantially performed for SDLT purposes. The relevant SDLT date could therefore be when Amir moved in rather than the later completion date.
Change one fact: Amir only visits the flat to measure rooms and arrange furniture delivery, while the seller keeps possession and control. That is very different.
Limited access is not automatically possession of the property.
Why this can be difficult in practice
Early access arrangements are common when a move is delayed. They can appear informal, especially when the buyer and seller know each other.
Yet the detail can change the SDLT date.
You might think that handing over keys settles the question. It does not.
The important issue is what rights and control the buyer actually had.
- Access for viewings or surveys is not the same as possession.
- Part occupation may need a close look at how much of the property was available.
- Rent rights can count as possession even if nobody moves in.
- A large payment is not always enough; the statutory test looks at whether it is substantially all of the relevant amount.
- Options and rights of first refusal need separate consideration from a later purchase.
- HMRC’s manual explains its view, but the legislation is the law.
Because the supplied legislation text is current only to 17 November 2025, anyone dealing with a transaction after that date should check the current law where the answer could affect a rate or relief.
Do so.
Key takeaways
- Completion is usually the SDLT date, but not always.
- Early possession or payment can move the date forward.
- Keep the contract, access records and payment evidence together.
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 — completion without earlier substantial performance; contracts substantially performed before completion; events which count as substantial performance; meaning of taking possession before completion; when payment is a substantial amount; later completion after substantial performance; repayment where the contract later ends; meaning of contract and completion
- FA 2003 section 46 — options and pre-emption rights as separate transactions; effective date for options and pre-emption rights
- FA 2003 section 119 — usual effective date is completion date; special effective dates under other provisions
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 all or substantially all of the property can depend on the agreement and the facts.
- Whether a payment is substantially all of the amount due can depend on how the deal is structured.
- The linked HMRC manual pages may have been updated after the supplied legislation extract.
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 any side agreements
- The agreed completion date
- Evidence of keys, access, occupation or rent rights before completion
- Bank records showing payments made before completion
- Any option, right of first refusal or conditional agreement
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 When stamp duty can start before you complete a property purchase [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 - completion without earlier substantial performance https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 44 - contracts substantially performed before completion https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 44 - events which count as substantial performance https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 44 - meaning of taking possession before completion https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 44 - when payment is a substantial amount https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 44 - later completion after substantial performance https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 44 - repayment where the contract later ends https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 44 - meaning of contract and completion https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 46 - options and pre-emption rights as separate transactions https://www.legislation.gov.uk/ukpga/2003/14/section/46/2025-11-17 - FA 2003 section 46 - effective date for options and pre-emption rights https://www.legislation.gov.uk/ukpga/2003/14/section/46/2025-11-17 - FA 2003 section 119 - usual effective date is completion date https://www.legislation.gov.uk/ukpga/2003/14/section/119/2025-11-17 - FA 2003 section 119 - special effective dates under other provisions https://www.legislation.gov.uk/ukpga/2003/14/section/119/2025-11-17 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm07550 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 all or substantially all of the property can depend on the agreement and the facts. - Whether a payment is substantially all of the amount due can depend on how the deal is structured. - The linked HMRC manual pages may have been updated after the supplied legislation extract. 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: When stamp duty can start before you complete a property purchase
Search Land Tax Advice with Google
