SDLT overlap relief when a business lease is replaced
Overlap relief at a glance
When a qualifying replacement lease overlaps an old lease, SDLT can reduce the new lease rent used for the shared period.
- The old rent must already have been counted for SDLT.
- The reduction cannot make new lease rent negative.
- Lease dates, plans and old SDLT records matter.
Scroll down for the full analysis.
Read the original guidance here:
SDLT overlap relief when a business lease is replaced
When you replace a lease before the old one would have ended, SDLT may otherwise count rent twice, because both leases can cover the same time. Overlap relief prevents that result in qualifying cases. It reduces the rent used in the SDLT calculation for the shared period. It does not erase rent or produce a cash refund by itself.
What this rule is about
HMRC can charge SDLT on lease rent as well as on any upfront payment. To calculate that rent figure, SDLT uses a net present value that gives less weight to rent due further in the future.
Problems can arise if an old lease ends early and a replacement begins straight away. Both leases then cover the same premises for a time. Without a reduction, SDLT could count rent for that same time twice.
Overlap relief addresses that narrow problem. Instead, ask whether the replacement fits the statutory situations and covers the same, or substantially the same, premises, rather than simply asking whether you have signed another lease. That statutory test governs.
What the official source says
HMRC’s manual says overlap relief is available when a lease, or a lease treated as existing for SDLT, is replaced or followed by another lease of substantially the same premises. Their periods must overlap.
Parliament sets out the particular situations where this treatment applies. For the overlap period, the legislation reduces rent under the new lease by the rent that SDLT already counted under the old lease.
- The old lease is surrendered and the landlord grants the same tenant a replacement lease.
- A tenant requests and receives a new tenancy under the business-tenancy rules.
- A sub-tenant receives a replacement lease after the head lease ends in specified circumstances.
- A guarantor receives a lease under the guarantee after the tenant’s lease ends.
- The new lease must cover the same or substantially the same premises.
- The overlap runs from the grant of the new lease until the old lease would have ended for SDLT purposes.
- The reduction uses the old rent already included in its SDLT calculation.
- The new lease rent for any period cannot be reduced below zero.
What this means in practice
This calculation rule changes the rent used to work out SDLT on the new lease. It does not mean that rent under the new lease disappears for the overlap period.
First identify the old lease’s SDLT rent figure. Compare rents throughout the shared period. Only the amount that SDLT already counted on the old lease can reduce the new amount.
- Keep the old SDLT return and its rent calculation.
- Check the dates when the old lease would have ended.
- Compare the lease plans, not just the postal address.
- Check whether all of the old premises appear in the new lease.
- Do not reduce the new rent below nil.
- Do not expect overlap relief if the old lease was subject to stamp duty rather than SDLT.
How to analyse it
Start with the legal event. A variation may create a new lease. For SDLT, a document described as a variation can end the old lease and create a new one. Adding floors, for example, may lead to that result.
Next, work through the dates and the rent. People often get this part wrong because the old lease end date may include an extension that SDLT treats as part of its term.
- Identify the old lease and the new lease.
- Ask why the old lease ended or was treated as ending.
- Check that the facts fit one of the statutory situations.
- Compare the premises covered by both leases.
- Find the new lease grant date.
- Find the old lease’s end date for SDLT purposes.
- Work out the shared period between those dates.
- Find the rent included in the old lease’s SDLT calculation.
- Apply that rent reduction to the new lease’s shared period.
- Apply the separate variable-rent rules, where relevant.
Example
Sam holds a lease of floors 1 to 3 of an office building. Sam paid SDLT when that lease began. Sam surrenders it, and the landlord grants Sam a new lease of floors 1 to 6.
The whole of the old space is in the new lease, so HMRC’s manual says the premises test can be met even though the new lease is much larger.
For one year of the overlap, if SDLT counted £60,000 of old-lease rent and the new lease requires £90,000 rent, the rent used for that year of the new lease’s SDLT calculation falls to £30,000. That is the reduction. This shows the reduction only, not the final SDLT bill.
Why this can be difficult in practice
“Substantially the same” does not demand identity. But calling a new deal a renewal is not enough. The plans, excluded areas, added areas and dates matter.
Variable rent adds another layer. When SDLT uses the highest-rent rule, it ignores overlap relief while finding that highest rent. The reduction cannot make the highest rent smaller.
- A lease taxed under old stamp duty does not supply SDLT rent to offset.
- An SDLT exemption on the old lease may mean no old rent was counted.
- RPI increases are ignored for SDLT, so they do not prevent full overlap relief by themselves.
- More than one old lease may be surrendered for one new lease.
- A tenant staying after expiry may trigger the separate holding-over rules.
- A backdated new lease needs careful checking of its stated start date and actual grant date.
Key takeaways
- Overlap relief prevents the same rent period being counted twice for SDLT.
- The new lease must fit a statutory replacement-lease situation.
- Old SDLT calculations and lease plans are central evidence.
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 17A para 9 — reduces rent where qualifying lease periods overlap
- FA 2003 Schedule 17A para 9A — covers backdated leases after a tenant holds over
- FA 2003 Schedule 17A para 3 — treats a continuing fixed-term lease as extended
- FA 2003 Schedule 17A para 4 — sets SDLT treatment for leases without fixed terms
- FA 2003 Schedule 17A para 7 — sets the highest-rent rule for variable rent
- FA 2003 Schedule 5 para 2 — uses net present value to tax lease rent
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
- Whether premises are substantially the same can depend on the lease plans and the property actually included.
- A lease variation may need careful analysis to establish whether it amounts to a surrender and new lease.
- The calculation depends on the rent that was in fact taken into account for SDLT on the old lease.
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 and new leases, including plans and dates.
- The SDLT return and rent calculation for the old lease.
- Details of any holding-over period and the date of the new lease.
- The rent schedule, including variable-rent and RPI clauses.
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 SDLT overlap relief when a business lease is replaced [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 17A para 9 - reduces rent where qualifying lease periods overlap https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/9/2025-11-17 - FA 2003 Schedule 17A para 9A - covers backdated leases after a tenant holds over https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/9A/2025-11-17 - FA 2003 Schedule 17A para 3 - treats a continuing fixed-term lease as extended https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/3/2025-11-17 - FA 2003 Schedule 17A para 4 - sets SDLT treatment for leases without fixed terms https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/4/2025-11-17 - FA 2003 Schedule 17A para 7 - sets the highest-rent rule for variable rent https://www.legislation.gov.uk/ukpga/2003/14/schedule/17A/paragraph/7/2025-11-17 - FA 2003 Schedule 5 para 2 - uses net present value to tax lease rent https://www.legislation.gov.uk/ukpga/2003/14/schedule/5/paragraph/2/2025-11-17 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm16010 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 - Whether premises are substantially the same can depend on the lease plans and the property actually included. - A lease variation may need careful analysis to establish whether it amounts to a surrender and new lease. - The calculation depends on the rent that was in fact taken into account for SDLT on the old lease. 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: SDLT overlap relief when a business lease is replaced
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