Stamp duty on conditional property contracts
Conditional contracts and SDLT
HMRC says a conditional property contract can trigger SDLT before final completion if it has been substantially performed.
- Possession can trigger the rule.
- Major payments can also trigger it.
- Dates and evidence matter.
Scroll down for the full analysis.
Read the original guidance here:
Stamp duty on conditional property contracts
An unfulfilled condition in your property contract will not necessarily postpone stamp duty where the agreement has already been substantially performed before the final transfer occurs. This matters. SDLT may, HMRC says, arise before the final transfer once that level of performance has occurred. The timing can matter.
What this rule is about
A conditional contract is an agreement that depends on something happening first. For example, planning permission may be needed. It may seem that no SDLT point can arise until the condition is met and the sale completes. That is not always right.
The key question is whether the deal has already moved far enough to count for SDLT. The law calls this substantial performance.
What the official source says
HMRC’s manual states that a conditional contract may still be chargeable to SDLT once it has been substantially performed. The legislation identifies two main ways this can happen before completion.
- You, or someone connected with you, take possession of all or nearly all of the property.
- All or nearly all of the amount you pay is paid or provided.
- Where rent is the only payment, the first rent payment can be enough.
- Where there is rent and another payment, either relevant event can trigger the rule.
What this means in practice
SDLT may become due at substantial performance instead of on the later completion date. An unresolved condition does not, by itself, stop that result.
- Check when you first received possession or the right to rental income.
- Check every payment made under the contract.
- Do not treat an unfinished sale as automatically outside SDLT.
How to analyse it
Begin with the actual events rather than the contract label. What occurred on the ground is often the important part.
- Read the contract and identify each condition.
- Check whether it is meant to end in a final transfer.
- Work out when possession, income rights or access began.
- Match each payment and rent payment to its date.
Example
Mina agrees to buy land, subject to a planning condition. Before the final transfer, she takes control of nearly all the land and pays nearly all the price while the contract remains subject to the planning condition. That can be enough. In HMRC’s view, the conditional contract may trigger SDLT at that stage, although the final transfer follows later.
Why this can be difficult in practice
This is where people get it wrong: describing an arrangement as a conditional contract does not determine the tax answer. Minor details concerning access, control, rent and payments can alter the result.
- Having keys may matter, but the extent of possession matters too.
- A payment schedule may hide that nearly all of the price has been paid.
- Rights to rents or profits can count as possession.
Key takeaways
- A condition does not automatically postpone SDLT.
- Possession or major payments can bring the SDLT point forward.
- Record the dates when control and payments actually changed.
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 becomes a taxable land transaction
- FA 2003 section 119 — when a transaction’s effective date is set
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 is substantially the whole of the price may also need close review.
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 its conditions
- Dates when keys, access, rents or income rights were given
- Records of payments and any rent paid
- The date of final completion
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 on conditional property contracts [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 becomes a taxable land transaction https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 119 - when a transaction's effective date is set 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/sdltm00880 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 is substantially the whole of the price may also need close review. 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 on conditional property contracts
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