When you must review stamp duty on estimated lease rent
Estimated lease rent and SDLT
Where SDLT was calculated using uncertain rent, the calculation may need a later review. This normally happens when first-five-year rent becomes known, or when the fifth year ends.
- Use actual first-five-year rent figures
- Recalculate the whole lease NPV
- Check for extra SDLT or a repayment
Scroll down for the full analysis.
Read the original guidance here:
When you must review stamp duty on estimated lease rent
If lease rent was estimated when you first dealt with stamp duty land tax, or SDLT, and the rent for the first five years later becomes clear, you may have to recalculate the tax. That recalculation may be required.
You may need to pay more tax, or you may be due money back.
What this rule is about
Not every lease gives a fixed rent for every year. Rent may depend on sales, a later rent review or another future event. In some cases, the law permits an estimate at the start.
The estimate cannot remain unchanged indefinitely. Rent in the first five years determines the assumed rent used later. Those figures affect the net present value, or NPV, used for SDLT.
NPV brings future rent payments into a single value at the start date. You do not need to work it out by hand to understand the main point: facts established later can change the original SDLT answer.
What the official source says
HMRC’s manual explains the review required by Schedule 17A. At the end of the fifth year of the lease term, unless rent payable in those first five years has become certain earlier through an agreed or decided rent review, you must revisit the rent calculation. Do so sooner.
- Review the rent sooner if a rent review is agreed or decided within the first five years.
- Use the actual rent paid or payable for the first five years, not the earlier estimate.
- Find the highest rent for any consecutive 12-month period in those first five years.
- Use that figure when working out assumed rent after year five.
- Recalculate the NPV for the full lease term.
- Compare the new NPV and SDLT result with the original return.
The law treats the rent as certain when a condition occurs, when it becomes clear that it will not occur, or when the amount is finally known. That is the point at which the review starts.
If the result makes the lease notifiable for the first time, a return is due within 14 days of the review date. Extra SDLT has a 30-day deadline.
The review date starts the clock. A further return and payment are required.
What this means in practice
Rent reviews can reopen SDLT calculations. They concern more than landlords and tenants. The review date can fall years after the lease began.
Any extra tax uses rates from the original date. The rates in force when the rent is reviewed are irrelevant.
- Keep the original SDLT calculation with the lease papers.
- Record each rent payment during the first five years.
- Keep notices, agreements and decisions that fix a rent review.
- Check whether the new result makes the lease notifiable for the first time.
- Pay any extra SDLT by the filing deadline for a required later return.
- Check for a repayment where the recalculation reduces the tax.
HMRC’s manual says that interest on extra tax runs from 30 days after the original effective date. It says overpayment interest runs from the first payment.
This is HMRC’s published view of the administrative result.
How to analyse it
Begin with the figures used in the original return. Then trace events forward from the lease start date. The issue is not merely whether rent changed. It is whether uncertain rent in the first five years has since become known.
- Identify every part of the first five years’ rent that was estimated, contingent or uncertain.
- Find the date on which each uncertain amount became known.
- Check whether that date is earlier than the end of year five.
- Replace estimates with the actual rent paid or payable.
- Identify the highest consecutive 12-month rent in the first five years.
- Recalculate the later-years rent assumption and the full NPV.
- Compare the tax with the amount already paid.
- Decide whether a first return, further return, amendment or repayment claim follows.
HMRC says changes to the lease term after the original transaction do not alter this calculation, and its manual also says that later changes in VAT treatment should be ignored for this purpose. These statements set out HMRC’s view.
They are not wording contained in the review provision itself.
Example
Amira takes a ten-year lease. Her first SDLT calculation uses estimated rent of £50,000 a year for the first five years. A rent review is agreed in year three. It confirms rent of £70,000 for year three and fixes the rent for the remaining first five years.
Amira must then review her SDLT calculation. She uses the actual figures for the first five years. If £70,000 is the highest rent in any consecutive 12-month period, it also becomes the assumed annual rent after year five.
The full NPV may increase. Extra SDLT triggers a 30-day deadline. The review date starts that deadline. A further return and payment are required.
Why this can be difficult in practice
Identifying the review date is often the difficult part. A lease may contain complex formulas. It may include a turnover-rent clause. Review processes may take time to settle.
The date on which rent becomes certain may differ from the date someone first expects.
- A rent review clause does not always mean the rent is already known.
- A provisional payment may not be the final rent figure.
- The highest 12-month rent can matter even if rent later falls.
- A lower NPV can lead to a repayment claim, not simply an informal correction.
- There is no requirement under this rule to revisit rent after the five-year period.
Most people make one error: they focus only on the rent that changed. The recalculation also changes the assumed rent for the rest of the lease.
A first-five-year review can therefore have a larger SDLT effect than expected.
Key takeaways
- Review estimated or uncertain first-five-year rent when it becomes known, or when year five ends.
- Use actual first-five-year rent and recalculate the whole lease NPV.
- A higher result can require a return and payment; a lower result can support a repayment claim.
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 51 — how contingent and uncertain rent is initially valued
- FA 2003 Schedule 5 para 2 — net present value used to calculate rent tax
- FA 2003 Schedule 17A para 7 — treatment of variable and uncertain lease rent
- FA 2003 Schedule 17A para 8 — review of tax when uncertain rent becomes known
- FA 2003 section 87 — interest on unpaid tax from the original effective date
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 supplied legislation is current only to 17 November 2025. Current-law verification is needed for a review date after that date.
- The exact form HMRC will accept for a repayment claim or later return can depend on the facts and HMRC’s current process.
- Whether rent has become certain can depend on the lease wording and the event that fixes the amount.
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 lease and any side agreements
- the original SDLT return and calculation
- rent review notices, agreements or determinations
- a year-by-year record of rent actually payable for the first five years
- the original effective date and tax payment date
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 When you must review stamp duty on estimated lease 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 section 51 - how contingent and uncertain rent is initially valued https://www.legislation.gov.uk/ukpga/2003/14/section/51/2025-11-17 - FA 2003 Schedule 5 para 2 - net present value used to calculate rent tax https://www.legislation.gov.uk/ukpga/2003/14/schedule/5/paragraph/2/2025-11-17 - FA 2003 Schedule 17A para 7 - treatment of variable and uncertain lease rent https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/7/2025-11-17 - FA 2003 Schedule 17A para 8 - review of tax when uncertain rent becomes known https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/8/2025-11-17 - FA 2003 section 87 - interest on unpaid tax from the original effective date https://www.legislation.gov.uk/ukpga/2003/14/section/87/2025-11-17 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm13155 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 supplied legislation is current only to 17 November 2025. Current-law verification is needed for a review date after that date. - The exact form HMRC will accept for a repayment claim or later return can depend on the facts and HMRC's current process. - Whether rent has become certain can depend on the lease wording and the event that fixes the amount. 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: When you must review stamp duty on estimated lease rent
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