Stamp duty when substantial performance happens at completion
When completion sets the SDLT date
If a property contract is not substantially performed before completion, the contract and completed purchase are treated as one SDLT transaction.
- The effective date is completion.
- Early possession or relevant payments can change the result.
- HMRC’s manual is guidance; the legislation is the law.
Scroll down for the full analysis.
Read the original guidance here:
Stamp duty when substantial performance happens at completion
Stamp duty when substantial performance happens at completion
If nothing counts as substantial performance before you complete a property purchase, stamp duty treats the signed deal and completion as one event. Completion is the key date. Timing matters.
What this rule is about
A property deal may begin with a contract and end when the transfer is completed. Usually, those are not two separate purchases for SDLT. They stay together in this situation.
“Substantial performance” is a tax label for certain important steps taken before completion, including possession or a payment that meets the test in the Act. This matters.
What the official source says
HMRC’s manual says that, if substantial performance happens only when the purchase is formally completed, the contract and transfer form one land transaction. In that case, the effective date for SDLT is the completion date.
- There must be a contract for a purchase to be completed by a transfer document.
- The contract must not have been substantially performed earlier.
- The purchase must then complete.
What this means in practice
You do not treat the contract date and completion date as separate SDLT events in this situation. Completion is the date that matters for the transaction.
- Keep clear records of the completion date.
- Check whether you had access to the property before then.
- Check payments made before completion.
How to analyse it
Focus on what actually happened rather than simply on what the paperwork calls it. Early access can change the answer.
- Read the contract and identify the planned completion date.
- Check whether the buyer took possession before that date.
- Check whether the statutory payment test was met before that date.
- If neither happened, treat completion as the effective date.
Example
Before completion, Maya neither takes possession nor makes a payment that meets the statutory test, despite having signed a contract to buy a house. On completion, the transfer is signed and she gets the keys. Together, the contract and completed purchase count as one land transaction, with completion as its effective date.
Why this can be difficult in practice
Checking for early keys is not enough. Access, rent and payments may show that substantial performance happened sooner than expected.
- Early occupation may count as possession.
- The right to receive rent may also count as possession.
- A payment before completion may matter even where completion follows shortly after.
Key takeaways
- Completion is the key date if nothing important happened earlier.
- The contract and completed purchase then count as one transaction.
- Check possession and payments before completion.
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 after no earlier substantial performance; defines when a contract is substantially performed
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 early access, receipt of rent, or a payment amounts to substantial performance can depend on the detailed facts and timing.
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 transfer document
- The completion date
- Records of payments made before completion
- Evidence of when the buyer received possession or rights to rent
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 when substantial performance happens at 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 - completion after no earlier substantial performance https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 44 - defines when a contract is substantially performed https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm07750 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 early access, receipt of rent, or a payment amounts to substantial performance can depend on the detailed facts and timing. 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 when substantial performance happens at completion
Search Land Tax Advice with Google
