Stamp duty when you build on land before completion
Early entry can bring forward stamp duty
HMRC’s example shows how a buyer who enters land under a licence and starts work may face an earlier SDLT date than expected.
- Entry can amount to substantial performance
- Work after that date may be excluded from the land price
- The contract and site facts decide the outcome
Scroll down for the full analysis.
Read the original guidance here:
Stamp duty when you build on land before completion
Starting building work before you legally own a plot can bring forward your stamp duty land tax bill. In HMRC’s example, entry under a licence brought the tax date forward.
Specific conditions excluded building costs. The price was £1 million.
What this rule is about
Most people expect tax on completion. That is often right.
Yet a contract can be treated as completed early for tax purposes if you take possession of all, or almost all, of the land.
This is called substantial performance. A short-term licence can still trigger it. That includes entry under a short-term licence rather than under the purchase contract itself.
The date matters. It fixes when the tax position is worked out.
Building work raises a separate issue. Its value may count as what you have given for the land.
The law has a special rule for construction, repair and improvement work.
What the official source says
HMRC’s manual gives an example involving a company that agrees to buy a freehold plot for £1 million.
Before the formal transfer, it enters under a licence and starts construction work, and HMRC says those facts mean the company substantially performed the contract when it entered the land.
The entry date is the tax date.
- Where the company enters the plot under a licence before formal completion, the tax date is the entry date rather than the later completion date for the transfer.
- HMRC says the return at that point should show the £1 million agreed price.
- The manual says the later building work does not increase that amount.
- For that result, the work must be done after the tax date.
- It must involve qualifying land.
- For the result to apply, the contract must not require the seller, or anyone connected with the seller, to do the work on any of the qualifying land. This condition is separate.
Qualifying land can cover not only land bought under the deal but also other land held by the buyer or by a connected person at that time. It is wider.
Those three conditions come from Finance Act 2003, Schedule 4, paragraph 10. If one is not met, the open-market value of the work can be included in the amount paid for the land.
What this means in practice
Early access can matter more than a builder’s start date. Once your use of the site amounts to taking possession, stamp duty may need dealing with before the legal transfer takes place.
Not every pound spent on the site becomes part of the land price. Later qualifying work can be left out.
All conditions must be met.
- Check the licence carefully before entering the site.
- Record the date you first had practical possession of the land.
- Keep the purchase price separate from your building budget.
- Check whether the seller has any duty to arrange, fund or carry out work.
Although a licence may appear to be no more than a practical arrangement for site access, it can alter the date on which tax falls due. That matters.
How to analyse it
Start with the sequence of events, not the document labels. Ask what happened on the ground and when it happened.
A long licence, site control and the start of major works may point in a different direction from a brief visit to inspect the plot.
- What land did the contract say you would buy?
- When did you enter, and what rights did the licence give you?
- Did you take possession of all or substantially all of that land?
- What was the agreed price before any building work began?
- When did each part of the work take place?
- Was the work on the purchased land or on other qualifying land?
- Did the seller, or anyone linked to the seller, have to carry out the work?
Then apply the construction-work conditions separately. Do not assume a separate-project label decides the issue.
The written deal and the facts must support that description.
Example
Company A agrees to buy a freehold plot from B for £1 million. Before legal completion, A enters under a licence and begins construction.
HMRC’s example treats the entry date as the tax date because A has taken possession. The tax calculation therefore starts with £1 million.
The building work began after that date, on the plot A was buying. Nothing required B, or someone connected with B, to do the work.
On the stated facts, applying the construction-work rule does not add the value of that work to the £1 million.
Change one fact and the answer may change. If the purchase deal made B responsible for providing the construction work, that condition would not be met.
Why this can be difficult in practice
Possession is a question of fact. A document headed “licence” does not answer it by itself.
What matters is whether you had control of the whole, or nearly the whole, plot in a way that amounts to possession.
The manual’s statement about the later return also needs care. It says a further SDLT1 is needed only if a change affects the tax due.
However, the legislation says both the early contract transaction and the later completion are notifiable where the contract was substantially performed.
- Do not assume formal completion is always the tax date.
- Do not add building costs automatically to the property price.
- Do not rely only on the licence title or the builder’s invoice date.
- Check the current return process where completion follows early possession.
Key takeaways
- Early entry onto a plot can bring forward the stamp duty date.
- Later construction work may be left out of the land price.
- That result depends on the timing, land and contract terms.
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 50 — schedule rules for amounts paid for land
- FA 2003 section 44 — early possession can trigger the tax date; treatment when an early contract later completes
- FA 2003 section 76 — deadline for filing a land transaction return
- FA 2003 section 77 — which land transactions need a tax return
- FA 2003 Schedule 4 para 10 — when building work is excluded from the price
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 HMRC manual says a further SDLT1 is needed only where a change between early performance and completion affects the tax due. However, Finance Act 2003 section 44(8) says that both the contract and the later completion are notifiable transactions. The current return position should be checked against the legislation and HMRC’s current filing process.
- The supplied legislation is current only to 17 November 2025. A transaction after that date needs a current-law check.
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
- The licence allowing entry onto the land
- Evidence of the date possession began
- Building contracts, invoices and site records
- Terms showing whether the seller had to carry out work
- Details of any connected people or companies involved
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 you build on land 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 50 - schedule rules for amounts paid for land https://www.legislation.gov.uk/ukpga/2003/14/section/50/2025-11-17 - FA 2003 section 44 - early possession can trigger the tax date https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 44 - treatment when an early contract later completes https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 section 76 - deadline for filing a land transaction return https://www.legislation.gov.uk/ukpga/2003/14/section/76/2025-11-17 - FA 2003 section 77 - which land transactions need a tax return https://www.legislation.gov.uk/ukpga/2003/14/section/77/2025-11-17 - FA 2003 Schedule 4 para 10 - when building work is excluded from the price https://www.legislation.gov.uk/ukpga/2003/14/schedule/4/paragraph/10/2025-11-17 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm04060b 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 - The HMRC manual says a further SDLT1 is needed only where a change between early performance and completion affects the tax due. However, Finance Act 2003 section 44(8) says that both the contract and the later completion are notifiable transactions. The current return position should be checked against the legislation and HMRC's current filing process. - The supplied legislation is current only to 17 November 2025. A transaction after that date needs a current-law check. 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 when you build on land before completion
Search Land Tax Advice with Google
