Lease extensions and SDLT: when a change may create a new lease
Lease changes can have SDLT consequences
HMRC says that extending a lease term or adding land can end the old lease and create a new one. The result depends on the legal effect of the documents, not just their title.
- Compare the old and new terms
- Check plans and any extra land
- Identify all payments and obligations
Scroll down for the full analysis.
Read the original guidance here:
Lease extensions and SDLT: when a change may create a new lease
Lease extensions and SDLT: when a change may create a new lease
Changing your lease can sometimes end the old lease and start a new one. That can matter for stamp duty land tax, or SDLT, even if you and the landlord call the document a variation.
What this rule is about
Parties can change a lease in many ways. You might extend its length, add land, alter the rent, or add another tenant. Most people assume every major change creates a new lease. That is not HMRC’s view.
The key question is whether the old lease can still continue after the change. If it cannot, the law may treat it as surrendered. The landlord then grants a new lease.
This can happen in two ways. The parties may expressly agree to give up the old lease and replace it. Or the legal effect of their actions may produce that result.
What the official source says
HMRC’s manual says that extending the length of an existing lease normally causes a surrender and regrant. So does extending the area covered by that lease. The manual treats both changes as inconsistent with the old lease continuing.
- An extension of the lease term can create a replacement lease.
- An increase in the area covered by the lease can create a replacement lease.
- A reversionary lease is different if it starts only when the old lease ends.
- A lease of separate property is different from adding land to the existing lease.
- A rent change alone does not, in HMRC’s view, create a surrender and regrant.
- HMRC’s view is that reducing the leased area does not create a surrender and regrant.
- Adding another tenant to an existing lease does not, in HMRC’s view, create one.
That is HMRC’s published view, not a rule written in the manual itself.
The legislation treats a lease variation as a land transaction only where it takes effect, or is treated as taking effect, as the grant of a new lease.
What this means in practice
If a change creates a new lease, do not treat the paperwork as a simple update. You need to consider the SDLT position for the surrender and for the new lease.
That does not mean SDLT will always be due. You need to analyse the new arrangement as a possible new land transaction.
The amount, if any, depends on the full terms and what is given in return.
- Keep the old lease as well as the new documents.
- Check whether the term has been extended.
- Compare the old plan with the new plan.
- List every payment, premium and rent obligation.
- Check whether the same landlord and tenant remain involved.
- Do not assume a document headed “deed of variation” settles the point.
Where the same parties exchange an old lease for a new one, the legislation stops either lease from counting as payment for the other. That rule does not remove the need to check other payments or obligations.
How to analyse it
Begin by identifying what has changed in real terms. Do not rely on the document label. Then trace the lease history and compare the plans. People often miss this.
- Read the original lease and identify its original end date.
- Read the new document and identify its legal effect.
- Ask whether the old lease could continue as it stood.
- Check whether the new term runs on from the old term.
- Compare the land covered before and after the change.
- Ask whether added land forms part of the same lease or is separately leased.
- Separate a rent change from a term or area change.
- Identify any cash payment or other value given by either side.
- Work out whether there is an express surrender, an implied one, or neither.
What actually decides it? Usually, the term, the land and the effect of the drafting. Calling the deal an extension is not enough on its own.
Example
Amir holds a lease of a shop and its 1,000 square metre yard. On the terms currently in force, the lease is due to end in 2030. Those are the original terms.
In 2026, the landlord signs a deed giving Amir a further five years and adding 200 square metres beside the yard. HMRC’s manual indicates that, where a lease term is extended or the land within the lease is enlarged, either change can cause a surrender and regrant by operation of law.
That can happen by operation of law.
Now change one fact. The landlord instead grants Amir a separate lease of the extra 200 square metres, while the old shop lease stays unchanged.
HMRC draws a distinction between separately leased property and land added to an existing lease. The documents and plans matter.
Why this can be difficult in practice
A single lease deal may simultaneously involve a variation, a new lease, a separate lease and a surrender, depending on how the documents operate together and what each one covers. The overlap matters. Plans can also be unclear.
You might think a rent increase is always harmless. It is not safe to stop there. HMRC says a rent change alone does not cause a surrender and regrant, but SDLT has separate rules for some rent changes.
- An “extension” may be a new lease or a lease that starts later.
- Extra space may be added to the old lease or let under a separate lease.
- A reduced area may be documented as a part surrender or a variation.
- A new tenant may join an existing lease without replacing it.
- Several documents signed together may need to be read as one arrangement.
- Payments outside the stated rent can affect the SDLT analysis.
Key takeaways
- Extending a lease term can create a new lease for SDLT purposes.
- Adding land to an existing lease can have the same result.
- A changed rent, smaller area or extra tenant does not automatically replace the lease.
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 43 — when lease changes count as land transactions
- FA 2003 section 48 — land interests that can fall within SDLT
- FA 2003 Schedule 17A para 16 — treatment of a new lease after surrender
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 boundary between a variation and a new lease can be difficult where several changes are made in one document.
- Whether added land is part of an enlarged existing lease or is instead covered by a separate new lease depends on the drafting and the land affected.
- The statutory material checked is current only through 17 November 2025. A transaction after that date needs a current legislation 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 old lease and every deed, licence, variation or new lease
- Plans showing the land before and after the change
- The start and end dates for both leases
- Details of rent, premiums and any other payment
- Evidence of whether the parties intended one continuing lease or a replacement
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 Lease extensions and SDLT: when a change may create a new lease [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 43 - when lease changes count as land transactions https://www.legislation.gov.uk/ukpga/2003/14/section/43/2025-11-17 - FA 2003 section 48 - land interests that can fall within SDLT https://www.legislation.gov.uk/ukpga/2003/14/section/48/2025-11-17 - FA 2003 Schedule 17A para 16 - treatment of a new lease after surrender https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/16/2025-11-17 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm17080 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 boundary between a variation and a new lease can be difficult where several changes are made in one document. - Whether added land is part of an enlarged existing lease or is instead covered by a separate new lease depends on the drafting and the land affected. - The statutory material checked is current only through 17 November 2025. A transaction after that date needs a current legislation 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: Lease extensions and SDLT: when a change may create a new lease
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