Stamp duty and pre-completion property transactions
Pre-completion transactions at a glance
A pre-completion transaction can arise where a buyer under an unfinished property contract gives another person the right to require the seller to transfer all or part of that property.
- It can change the normal SDLT analysis.
- Completion is not the only key event: substantial performance can matter first.
- Check the agreements, the rights they create and the timeline.
Scroll down for the full analysis.
Read the original guidance here:
Stamp duty and pre-completion property transactions
If you agree to buy a property, then arrange for somebody else to take it before completion, stamp duty may not follow the simple sale you expected. People call this a pre-completion transaction. It can affect who HMRC treats as making a land purchase.
What this rule is about
Most house purchases are simple: one buyer signs a contract, then completes and receives the property. A pre-completion transaction involves an extra step before that happens.
In this arrangement, the original buyer makes another agreement that gives someone else the right to require the seller to transfer all or part of the property to them. People often call the original buyer the transferor. People call the final buyer the transferee.
Those labels can make this sound more complicated than it is. Ask a simple question: before the first deal finished, did somebody else gain the right to make the seller transfer the property?
What the official source says
According to HMRC’s manual, the starting point is a contract for a land transaction which will be completed by a conveyance. A conveyance is the legal document or process that transfers the property.
Before completion or substantial performance of that original contract, its buyer may enter a further agreement. A buyer can substantially perform a contract before completion, for example by taking possession or paying almost all of the amount due.
- There must first be an original contract for a property transaction.
- The contract must be one intended to finish with a transfer of the property.
- The original contract must not yet be completed.
- It also must not yet have been substantially performed.
- The original buyer must enter into a further agreement.
- That agreement must entitle another person to call for a transfer.
- The right may cover all or only part of the property in the original deal.
HMRC says the detailed rules are in Finance Act 2003, section 45 and Schedule 2A. The manual says they apply to pre-completion transactions entered into on or after 17 July 2013, but adds that transitional rules may matter.
What this means in practice
This is not limited to a document headed “assignment”. It can include a sub-sale or another arrangement that gives a new person the right to call for the transfer before the first contract finishes.
Why does timing matter? The special pre-completion rules may change the normal SDLT rules for a contract and completion. Do not assume that only the person named on the first contract matters.
- Keep the first contract and every later agreement together.
- Check whether the later deal gives a real right to require the transfer.
- Check whether it covers the whole site or only a defined part.
- Record when anyone paid money or took possession.
- Do not treat completion day as the only date that matters.
- Do not rely just on the title of the later document.
Here is the part people get wrong: a deal can change the SDLT position before the legal transfer takes place.
How to analyse it
Start with the documents and the order of events. Names that the parties use can help, but the rights that the agreements create matter more.
- What property does the original contract cover?
- Was it due to be completed by a legal transfer?
- What later agreement was made?
- Who made that agreement, and who benefited from it?
- Could the new person require the seller to transfer the property to them?
- Did that right cover all or part of the original property?
- Had the first contract already been completed?
- Had it already been substantially performed through possession or payment?
- Was the later agreement entered into on or after 17 July 2013?
- Could transitional rules affect the answer?
Answer these in date order. If parties create a right after completion, HMRC’s introduction does not describe that situation.
Example
Amira signs a contract to buy a plot for £300,000. Before she completes, she agrees that Ben can require the seller to transfer the whole plot directly to him. At that point, the arrangement may be a pre-completion transaction because Ben has gained the right to call for the transfer before Amira’s contract has finished.
Change one fact and the answer may change. If Amira had already completed the purchase before agreeing to sell it to Ben, this would not be a pre-completion transaction of the type described by HMRC. It would be a later sale by Amira.
Why this can be difficult in practice
Finding the real arrangement is often the hard part. Parties may use several documents, change who pays, or split a site into parts. The legal effect of those documents matters more than informal descriptions.
There is also a timing trap. “Substantially performed” can happen before legal completion. Taking possession or paying almost all the price can be enough under the contract rules.
- An agreement may transfer rights even if it is not called an assignment.
- A later buyer may have rights over only part of the original property.
- Possession can matter even without the final legal transfer.
- Paying nearly all the price can matter before completion.
- HMRC’s manual does not itself decide the legal result.
- The detailed Schedule 2A rules need checking against the law in force on the relevant date.
Key takeaways
- A pre-completion transaction involves a new right to call for a property transfer.
- It must arise before the original contract is completed or substantially performed.
- Documents, rights and dates are more important than the label used for the deal.
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 completed by conveyance and substantial performance
- FA 2003 section 45 — schedule rules for transactions before contract completion
- FA 2003 Schedule 2A — rules for pre-completion 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
- The result can depend on the exact terms and timing of both agreements, including whether the original contract was completed or substantially performed first.
- The supplied material does not set out the transitional rules mentioned by HMRC.
- Current Schedule 2A wording and any changes after 17 November 2025 need verification before applying this page to a later transaction.
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 original purchase contract.
- The later agreement, assignment or sale agreement.
- Dates of exchange, completion, payment and possession.
- Details of who could require the seller to transfer the property.
- Whether the later agreement covers all or only part of the property.
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 and pre-completion property transactions [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 completed by conveyance and substantial performance https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 45 - schedule rules for transactions before contract completion https://www.legislation.gov.uk/ukpga/2003/14/section/45/2025-11-17 - FA 2003 Schedule 2A - rules for pre-completion land transactions https://www.legislation.gov.uk/ukpga/2003/14/schedule/2A/2025-11-17 HMRC's guidance page on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm21510 HOW I WANT YOU TO ANSWER 1. Work from the legislation above. Read it before answering. HMRC guidance is HMRC's 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 - The result can depend on the exact terms and timing of both agreements, including whether the original contract was completed or substantially performed first. - The supplied material does not set out the transitional rules mentioned by HMRC. - Current Schedule 2A wording and any changes after 17 November 2025 need verification before applying this page to a later transaction. 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: Stamp duty and pre-completion property transactions
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