Stamp duty when an agreement for lease completes later
In short
Starting a lease arrangement before the final document is signed can create an earlier SDLT event. A later lease may change the tax due and trigger another return.
- The final lease date determines which system applies.
- Extra tax after a reported notional lease generally means a further return within 30 days.
- Older leases granted before 17 July 2013 followed a different overlap-relief system.
Scroll down for the full analysis.
Read the original guidance here:
Stamp duty when an agreement for lease completes later
If you move in or start paying under an agreement for lease before anyone signs the final lease, and substantial performance occurs, SDLT may arise before that signature. Timing matters. The date of the final lease matters.
What this rule is about
Most people assume that a lease starts for tax when everyone signs it. That is not always so. An agreement for lease can undergo substantial performance first.
In simple terms, the parties have already put the arrangement into real and meaningful effect before they grant the formal lease.
This can happen if you take possession of all, or almost all, of the property. It can also happen when you make a substantial payment. Where rent is the only payment, paying the first rent can be enough.
When this happens, the law treats the agreement as a temporary tax lease, called a notional lease. Its effective date is the date of substantial performance. That date may come before the date on the signed lease.
What the official source says
HMRC’s manual explains two different systems. The date on which the parties granted the actual lease determines which system applies: before, or on or after, 17 July 2013. HMRC’s manual is guidance, not law, but its explanation reflects the statutory structure now in force.
- For an actual lease granted on or after 17 July 2013, HMRC updates the notional lease using the full term, rent and other payments under both arrangements.
- For this limited purpose, the law links the actual lease and notional lease.
- If that update increases the SDLT due, the tenant under the actual lease must pay the extra amount.
- If the tenant already reported the notional lease, the tenant must send a further return within 30 days of the actual lease’s effective date.
- HMRC says the tenant should send this further return as a letter to its Stamp Office, giving the original return reference, the new calculation and payment.
- If the tenant did not report the notional lease, but the final lease now makes tax due, the tenant must file an SDLT1 within 14 days.
The legislation requires a further return where a later linked transaction creates extra tax. It also directs the tax calculation by reference to the effective date of the earlier transaction.
So do not assume that the date of the signed lease controls the tax calculation.
What this means in practice
The final lease can alter the result because it may reveal a longer term, more rent, or another payment that did not feature in the earlier tax calculation. The later document does not simply replace the earlier return and make it disappear.
What if the revised calculation produces no extra tax? For leases granted on or after 17 July 2013, HMRC says you need make no further notification. Keep the calculation and lease papers.
They show why you filed nothing.
- Check whether you began occupation before the parties granted the final lease.
- Check the date of the first rent payment and any premium payment.
- Compare the term and rent in the agreement with the final lease.
- Find the unique transaction reference number from any original SDLT return.
- Recalculate before assuming the final lease needs no action.
How to analyse it
Start with dates, not the label on the documents. Calling something a licence, side letter or agreement does not settle whether substantial performance has happened.
- Was there an agreement for a lease?
- Did you take possession of the whole, or substantially the whole, property before completion?
- Did you make rent or another substantial payment before the final lease?
- What was the date of that substantial performance?
- When did the parties grant the actual lease?
- Was that date before or on or after 17 July 2013?
- Did you file a return for the notional lease?
- Does the final lease increase the tax when its full terms are used?
This is the part people get wrong: do not ask only whether the final lease has changed. Ask whether its grant changes the SDLT due on the earlier notional lease.
Example
Illustration: Priya signs an agreement for a shop lease, takes possession, and pays the first rent before the formal lease is granted. Priya calculates SDLT on the notional lease at £1,200 and reports it.
The parties grant the final lease after 17 July 2013. Its longer term and total rent raise the revised SDLT figure to £1,500. Priya owes the extra £300.
HMRC’s manual says Priya should send a further return as a letter within 30 days, with the original return reference, revised calculation and payment.
Change one fact and the result changes. If the revised calculation remained £1,200, HMRC says Priya would not need to make a further notification. Keep the papers to show how that answer was reached.
Why this can be difficult in practice
The hard question is often factual. Possession can include the right to receive rent and profits. You can also take possession under a temporary licence or lease.
A short gap between occupation and signing can therefore matter.
Older cases need particular care. For actual leases that parties granted before 17 July 2013, HMRC says the final grant formed a separate linked transaction. Overlap relief could reduce the rent counted twice when calculating the tax.
- For these older grants, HMRC says taxpayers used a new SDLT1 rather than a letter.
- If overlap relief reduced the net present value of the rent to nil, HMRC says no notification was required.
- Net present value means the tax method for putting future rent into a present-day figure.
- Overlap relief cannot produce a negative figure.
- A lower later calculation cannot create a refund merely because tax was paid after substantial performance.
Key takeaways
- Taking possession or paying rent can start the SDLT position before anyone signs a lease.
- A final lease that parties grant on or after 17 July 2013 can require a recalculation and further return.
- Keep the agreement, final lease, dates, original return and revised calculation together.
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 has been substantially performed
- FA 2003 Schedule 17A para 12A — notional leases after substantial performance of lease agreements
- FA 2003 section 81A — return when a later linked transaction makes tax due; further return and payment where extra tax arises
- FA 2003 Schedule 5 para 2 — net present value used to calculate tax on rent
- FA 2013 Schedule 41 para 6 — 2013 change to treatment of completed lease agreements
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
- A lease document may not make clear when possession began, when rent was first paid, or whether the final lease follows the earlier agreement.
- The supplied legislation is current only to 17 November 2025. The current statutory position must be checked for an actual lease granted after that date.
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 agreement for lease and the signed final lease
- dates of possession, access and first rent payment
- the original SDLT return and its unique transaction reference number
- the original tax calculation and a recalculation using the final lease terms
- evidence of rent, premiums and any other amount paid
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 an agreement for lease completes later [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 has been substantially performed https://www.legislation.gov.uk/ukpga/2003/14/section/44/2025-11-17 - FA 2003 Schedule 17A para 12A - notional leases after substantial performance of lease agreements https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/12A/2025-11-17 - FA 2003 section 81A - return when a later linked transaction makes tax due https://www.legislation.gov.uk/ukpga/2003/14/section/81A/2025-11-17 - FA 2003 section 81A - further return and payment where extra tax arises https://www.legislation.gov.uk/ukpga/2003/14/section/81A/2025-11-17 - FA 2003 Schedule 5 para 2 - net present value used to calculate tax on rent https://www.legislation.gov.uk/ukpga/2003/14/schedule/5/paragraph/2/2025-11-17 - FA 2013 Schedule 41 para 6 - 2013 change to treatment of completed lease agreements https://www.legislation.gov.uk/ukpga/2013/29/schedule/41/paragraph/6 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm50260 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 - A lease document may not make clear when possession began, when rent was first paid, or whether the final lease follows the earlier agreement. - The supplied legislation is current only to 17 November 2025. The current statutory position must be checked for an actual lease granted after that date. 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 an agreement for lease completes later
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