Variable lease rent: how stamp duty uses the highest early rent
Variable lease rent and SDLT
For rent after the first five years of a lease, SDLT generally uses the highest rent in any consecutive 12-month period during the first five years.
- Use known first-five-year rent figures.
- Estimate or assume uncertain early rent under the statutory rules.
- Keep later lease variations separate from built-in rent changes.
Scroll down for the full analysis.
Read the original guidance here:
Variable lease rent: how stamp duty uses the highest early rent
Variable lease rent: how stamp duty uses the highest early rent
If your lease rent changes over time, stamp duty land tax can use a figure that is higher than the rent you expect to pay later. For rent after year five, the key figure is usually the highest rent in any 12-month period during the first five years. That can affect the SDLT bill on a commercial lease.
What this rule is about
The SDLT calculation for lease rent uses its net present value, or NPV, which gives today’s value to rent that is due across the full lease term. That is the basic calculation.
A fixed rent is fairly simple to put into that calculation. Difficulties arise where rent increases, is linked to sales, or cannot be determined when the lease is granted. That uncertainty matters.
The law has a special method for this. It stops the calculation depending on unknown rent far into the future.
What the official source says
HMRC’s manual explains that the special method applies where rent varies under the lease itself, or where it is contingent, uncertain or unascertained. HMRC’s manual is guidance, not law. The legislation sets the legal rule.
- For the first five years, where rent is known when the lease is granted, use the actual amount rather than an assumed or estimated figure.
- That includes fixed rent rises written into the original lease.
- If first-five-year rent depends on a future event, assume the event happens and the rent is payable.
- If the amount is uncertain or not yet known, use a reasonable estimate.
- For each year after year five, use the highest rent payable for any consecutive 12-month period in the first five years.
- Ignore a lease term that adjusts rent in line with the retail prices index for this purpose.
So the law does not simply use the rent that will actually be paid in year six, year seven, or later. It substitutes the early five-year high point instead.
What does “highest” mean here? Find each possible consecutive 12-month period starting from the grant date. Use known rent or, where needed, the assumed or estimated first-five-year rent. The largest result is the figure used after year five.
What this means in practice
A stepped-rent lease can produce an NPV calculation that feels surprising. Where a large increase is agreed within the first five years but rent then falls later, the lower later rent may not reduce the NPV input. It may therefore have no effect.
The reverse is also true. A very large increase after the first five years does not replace the statutory figure based on the first five years.
- Read the whole rent clause, not just the rent due on the first payment date.
- Separate fixed rises from rent that depends on sales, use, profit or another event.
- Build a year-by-year schedule for the first five years.
- Check whether the lease contains an RPI-linked adjustment.
- Keep later changes to the lease separate from rent changes already written into it.
This last point matters. This page concerns changes provided for in the original lease. A later agreement that changes the rent is a different issue. The law can treat certain later increases as a new lease transaction.
How to analyse it
Start with the lease as it stood when granted. Do not begin with what rent happened to be paid later. The wording and timing are what matter.
- Is this a grant of a lease in England or Northern Ireland?
- What is the lease term, starting from the grant date?
- What rent is due in each part of the first five years?
- Is each amount fixed, dependent on a future event, or still unknown?
- For unknown first-five-year rent, what assumption or reasonable estimate is required?
- Which consecutive 12-month period in those five years has the highest rent?
- Use that highest figure as the annual rent input for the remaining years.
- Has the rent later become known, so that the SDLT position needs reconsidering?
If the rent for the first five years later becomes certain, or the fifth year ends, the legislation provides for the tax position to be reconsidered. A higher result can create more SDLT. A lower result can support a repayment route.
Example
Amir takes a ten-year shop lease. The lease says rent is £20,000 a year for years one and two, then £30,000 a year for years three to five. It also says rent will be £50,000 a year from year six.
Using the stated amounts for the first five years, the NPV calculation takes £20,000, £20,000, £30,000, £30,000 and £30,000 in sequence. The highest rent for a consecutive 12-month period in those years is £30,000.
For years six to ten, the special rule uses £30,000 a year in the NPV calculation, not the £50,000 actually due under the lease. This example only shows the rent figures used. The tax due depends on the statutory NPV calculation and the rate rules that apply to the lease.
Why this can be difficult in practice
The awkward cases are not usually simple fixed increases. They are clauses where rent depends on turnover, a review, an index, an option, or a later agreement between landlord and tenant.
You might think any future rise is ignored after year five. It is not quite that simple. The first five years still set the figure used for every later year.
- A turnover-rent clause may need an assumption or a reasonable estimate.
- A review clause may be uncertain when the lease starts.
- An RPI adjustment has its own statutory treatment.
- A side letter may affect the analysis if it changes what rent is really payable.
- A later rent variation is not automatically part of the original lease calculation.
- Older leases may need separate checking because HMRC’s manual refers to historic abnormal-rent rules.
According to HMRC, the abnormal-rent provisions were abolished for leases whose effective date was on or after 17 July 2013, making this principally a historic issue. It is mainly historic. It should not distract from the main rule for a modern variable-rent lease: find the highest 12-month rent within the first five years.
Key takeaways
- Known first-five-year rent goes into the NPV calculation at its actual amount.
- Uncertain early rent needs an assumption or reasonable estimate.
- Later years usually use the highest 12-month rent from the first five years.
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 Schedule 5 para 2 — tax on rent uses its net present value
- FA 2003 section 51 — how contingent and uncertain payments are valued
- FA 2003 Schedule 17A para 7 — how variable and uncertain lease rent is treated
- FA 2003 Schedule 17A para 8 — reconsidering tax when uncertain rent becomes known
- FA 2003 Schedule 17A para 13 — rent increases caused by later lease variations
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 answer can depend on the exact wording of the lease, especially whether a rent change was built into the original lease or agreed later.
- The effective date and terms of the lease are needed before deciding whether historic rules could matter.
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 lease and any side letters
- A rent schedule for each part of the term
- Details of any turnover, index-linked or review-based rent
- The lease grant date and effective date
- Documents showing any later variation to the 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 Variable lease rent: how stamp duty uses the highest early rent [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 Schedule 5 para 2 - tax on rent uses its net present value https://www.legislation.gov.uk/ukpga/2003/14/schedule/5/paragraph/2/2025-11-17 - FA 2003 section 51 - how contingent and uncertain payments are valued https://www.legislation.gov.uk/ukpga/2003/14/section/51/2025-11-17 - FA 2003 Schedule 17A para 7 - how variable and uncertain lease rent is treated https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/7/2025-11-17 - FA 2003 Schedule 17A para 8 - reconsidering tax when uncertain rent becomes known https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/8/2025-11-17 - FA 2003 Schedule 17A para 13 - rent increases caused by later lease variations https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/13/2025-11-17 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm13135 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 answer can depend on the exact wording of the lease, especially whether a rent change was built into the original lease or agreed later. - The effective date and terms of the lease are needed before deciding whether historic rules could matter. 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: Variable lease rent: how stamp duty uses the highest early rent
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