Stamp duty when a lease rent review changes the rent
Uncertain rent after a lease review
A lease rent estimate used for stamp duty may need updating when a market review settles or the first five years end.
- HMRC’s example uses estimated rent in the first return.
- A higher revised rent can lead to another return.
- The fifth year matters even if the review remains disputed.
Scroll down for the full analysis.
Read the original guidance here:
Stamp duty when a lease rent review changes the rent
When a rent review sets a higher figure after a lease begins, you may need to update the stamp duty calculation because the original calculation used an estimate rather than the rent that ultimately applied. That can mean another SDLT return and more tax.
Timing matters.
What this rule is about
Stamp duty land tax on a lease can be charged on its rent as well as any upfront premium. To calculate the rent element, you use its net present value, often called NPV.
In simple terms, this brings rent due at different times into one figure for the tax calculation.
A market rent review creates a problem: nobody may know the later rent when the lease starts. You can use the information available then for the first return.
You must also revisit the position at a later point.
That is the key point.
What the official source says
HMRC’s example concerns a seven-year lease granted on 1 January 2018. At first, the rent was £100,000. A market review was due after four years, but nobody knew the later rent when the lease began.
- Annual rent of £100,000 was known for the first four years.
- For years five to seven, the initial estimate was £125,000.
- The review eventually set the rent at £150,000.
- HMRC’s example used £100,000 for years one to four in the original return, due by 31 January 2018.
- It used the £125,000 estimate for years five to seven.
- HMRC calculated the NPV from those known and estimated figures.
For variable or uncertain rent, the law treats the first five years as especially important. After that point, the calculation uses the highest rent payable for any consecutive 12-month period in those first five years.
When the fifth year ends, or when uncertainty ends earlier, the law requires a reconsideration of the tax position.
What this means in practice
You do not simply file once and forget the rent figure. If a review settles during the first five years, it may replace the estimate used in the original calculation.
If it remains unresolved, the fifth anniversary still triggers a reconsideration.
- Keep the estimate used in the original SDLT return.
- If it settles early, record the date of the rent review settlement.
- Check the end date of the lease’s first five years.
- Compare the new rent figure with the figure used before.
- Recalculate the NPV using the required known or estimated rent figures.
- Check whether the new calculation produces extra SDLT.
In the official example, a higher figure means you need to make a further return. HMRC says taxpayers sent this by letter to Stamp Taxes.
That is HMRC’s guidance for this historic example, rather than a rule created by the manual itself.
How to analyse it
Start with the lease, not the final rent figure. The review clause often contains the detail that decides the answer: when it takes effect, what period it covers, and when the parties established the amount.
- Find the lease start date and confirm its term.
- List the rent due in each year of the lease.
- Separate amounts known at the start from later estimates.
- Identify the first five years of the term.
- Check whether the review concluded before that period ended.
- If it did not, make a revised estimate at the end of year five.
- Use the revised figures to reconsider the NPV calculation.
- Check the deadline for any further return and extra tax.
What if the market rent is still disputed at year five? You still cannot wait indefinitely.
HMRC’s example says you must reconsider the estimate at that point, then update again once you know the actual figures for the first five years.
Example
Take HMRC’s seven-year example. The lease starts on 1 January 2018. Years one to four cost £100,000 each.
The tenant initially estimates £125,000 for each of years five to seven and uses that estimate in the return due by 31 January 2018.
If the review ends on 1 July 2022, the actual rent is £150,000. That is within the five-year period.
HMRC says you must file a further return by 31 July 2022, using £100,000 for years one to four and £150,000 for years five to seven.
Change one fact. The dispute does not end until 1 July 2023. By the end of the fifth year, the rent is still unknown.
HMRC says you must then reconsider the estimate and revise it to £145,000. As this exceeds £125,000, HMRC says you must file an additional return by 30 January 2023.
Once you know the actual rent for the first five years, update the return again and pay any extra tax.
Why this can be difficult in practice
People often focus on the date parties sign a rent review. That may not be enough.
You also need to know when the new rent applied and whether it changed the rent for part of the first five years.
- A disputed market review may leave the rent uncertain at the five-year point.
- An estimate must be realistic and may need revision as facts develop.
- A later agreement can affect rent that applied from an earlier date.
- The correct NPV depends on the rent figures used for each period.
- The source gives return dates but not the final SDLT amount.
- A late update can lead to extra tax and potential penalties.
This is the part people get wrong: the fifth year is not merely a useful checkpoint. Under the legislation, you may need to reconsider the SDLT treatment even where the market review has not finished.
Key takeaways
- Use the best available rent estimate in the first SDLT return.
- Revisit uncertain rent when it becomes known or year five ends.
- A higher revised rent may require another return and extra SDLT.
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 — calculating stamp duty on lease rent using NPV
- FA 2003 Schedule 17A para 7 — treating variable and uncertain rent during lease terms
- FA 2003 Schedule 17A para 8 — updating stamp duty when uncertain lease rent becomes known
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 correct treatment can depend on the lease wording, including when a rent review takes effect and whether the amount has truly become known.
- The HMRC manual’s direction to send a letter to Stamp Taxes is an instruction in this historic example, not a general statement of today’s filing method.
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 its rent-review clause
- The lease start date and length of term
- The original SDLT return and rent estimate
- The review notice, agreement, award or other evidence fixing rent
- Evidence of when rent for the first five years became known
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 a lease rent review changes the 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 - calculating stamp duty on lease rent using NPV https://www.legislation.gov.uk/ukpga/2003/14/schedule/5/paragraph/2/2025-11-17 - FA 2003 Schedule 17A para 7 - treating variable and uncertain rent during lease terms https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/7/2025-11-17 - FA 2003 Schedule 17A para 8 - updating stamp duty when uncertain lease rent becomes known https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/8/2025-11-17 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm13235 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 correct treatment can depend on the lease wording, including when a rent review takes effect and whether the amount has truly become known. - The HMRC manual's direction to send a letter to Stamp Taxes is an instruction in this historic example, not a general statement of today's filing method. 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 a lease rent review changes the rent
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