Non-Residential Lease Agreement: Substantial Performance and SDLT Implications Explained

SDLT on an Agreement for Lease After Substantial Performance

SDLT can become due before a lease is formally granted if an agreement for lease has been substantially performed, such as where the tenant goes into occupation early. In that case, HMRC treats the agreement as a lease for SDLT purposes from that earlier date, and the later formal grant of the lease will usually not create a second SDLT charge if tax has already been paid on the full term.

• A non-residential agreement for lease can become notifiable for SDLT when it is substantially performed, not just when the lease deed is signed.
• At that point, the agreement is treated as a lease running for the full contractual term, and SDLT is calculated by reference to the rent over that term using net present value rules.
• If the rent figure exceeds the relevant SDLT threshold, tax is payable at the date of substantial performance.
• When the formal lease is later granted, it is treated as linked to the earlier notional lease rather than as a wholly separate transaction.
• Where SDLT has already been paid on the full term, HMRC’s view is that no further SDLT return or extra tax should be due on the later grant.
• In practice, care is needed because whether substantial performance has happened, and whether the later lease matches the earlier agreement, can be fact-sensitive.

Scroll down for the full analysis.

SDLT on substantial performance of an agreement for lease: where the final lease is later granted

This page explains how SDLT can arise before a lease is formally granted, if an agreement for lease is substantially performed. It also explains what happens when the actual lease is then completed later. The point matters because tax may become payable earlier than many parties expect, and the later grant of the lease does not necessarily create a second SDLT charge.

What this rule is about

In SDLT, an agreement for lease can be treated as giving rise to a charge before the lease itself is formally granted. That happens if the agreement is substantially performed. In broad terms, substantial performance means the transaction has moved beyond a purely executory contract and the tenant has effectively begun to enjoy the benefit of the lease arrangement.

The source material deals with a common situation: a non-residential agreement for lease is substantially performed first, and the formal lease document is granted later. The question is how SDLT applies at each stage.

What the official source says

HMRC’s example says that where a non-residential agreement for lease is exchanged, then substantially performed, the agreement becomes notifiable at the point of substantial performance. It is treated as a lease running to the contractual expiry date.

In the example, the agreement for lease is exchanged on 1 January 2015, substantially performed on 1 February 2015, and the lease is later granted on 1 May 2015. The lease term ends on 30 April 2025, with a rent review to market rent at the end of the fifth year.

HMRC’s stated treatment is:

• on substantial performance, the agreement for lease is notifiable as a lease expiring on 30 April 2025;
• SDLT is payable at that stage to the extent that the net present value of the rent exceeds the relevant threshold; and
• when the actual lease is granted on 1 May 2015, that grant is a linked transaction with the notional lease already treated as arising on substantial performance, but no further return or tax should be due because SDLT has already been paid on the full term.

What this means in practice

The practical effect is that SDLT timing follows substantial performance, not just formal completion. If the tenant takes possession or otherwise substantially performs the agreement for lease before the lease is formally completed, the SDLT filing and payment position may crystallise at that earlier stage.

For a non-residential lease, the tax charge in HMRC’s example is based on the rent element, calculated by reference to the net present value of the rent over the full term ending on 30 April 2025. The later formal grant of the lease does not restart the SDLT analysis if it is simply giving legal effect to the same lease already brought into charge on substantial performance.

This is important for conveyancers and taxpayers because the document signed later may not be the event that creates the main SDLT obligation. If the transaction has already been substantially performed, the SDLT return may already be due.

How to analyse it

A sensible way to analyse this type of case is to ask the following questions.

• Is there an agreement for lease rather than an immediately granted lease?
• Has that agreement been substantially performed before the formal lease is granted?
• If so, what lease is treated as arising at that point, including its expiry date and rent terms?
• For a non-residential lease, what is the net present value of the rent over that term?
• Does that amount exceed the SDLT threshold so that tax becomes payable?
• When the formal lease is later granted, is it in substance the same transaction already brought into charge, so that it is linked with the earlier notional lease?
• Has SDLT already been paid on the full term, so that no further return or tax is required on the later grant?

The key analytical point in the source is that the earlier substantial performance creates a notional lease for SDLT purposes. The later grant of the actual lease is then viewed in light of that earlier charge, rather than as a wholly separate fresh lease charge.

Example

Illustration: a tenant agrees to take a 10-year non-residential lease ending on 30 April 2025. The agreement for lease is signed on 1 January 2015, but the tenant goes into occupation on 1 February 2015 before the formal lease is completed. If that occupation amounts to substantial performance, SDLT is considered at 1 February 2015, not 1 May 2015 when the lease deed is finally granted.

The lease is treated as running to 30 April 2025. SDLT is then worked out on that basis, including the rent over the full term and applying the net present value rules. If tax is due and paid at that point, the formal lease granted on 1 May 2015 is linked to the earlier notional lease and, on HMRC’s example, should not trigger a further SDLT return or additional tax.

Why this can be difficult in practice

The source example is short, but real cases can be more complicated.

First, whether there has been substantial performance can be fact-sensitive. The example assumes that substantial performance has happened on 1 February 2015, but in practice that may require careful analysis of what the tenant was allowed to do and what actually occurred.

Secondly, the tax result depends on treating the agreement as a lease for the full contractual term. If the later lease differs materially from what was contemplated at substantial performance, the position may need closer analysis. The source example does not explore that issue because it assumes the later lease corresponds to the earlier arrangement.

Thirdly, the source says there is a rent review at the end of the fifth year, but does not expand on how that affects the rent calculation. The main point being illustrated is timing and the relationship between the notional lease and the later actual lease, rather than the detailed computational treatment of rent review provisions.

Finally, the source is HMRC manual guidance. It explains HMRC’s view of how the SDLT rules apply in this example. The legal effect ultimately depends on the legislation, but the example is useful in showing HMRC’s practical approach to a substantially performed agreement for lease followed by formal grant.

Key takeaways

• An agreement for lease can become chargeable to SDLT before the lease is formally granted if it is substantially performed.
• In HMRC’s example, SDLT is calculated at that earlier stage by reference to the full lease term ending on the stated expiry date.
• When the formal lease is later granted, it is treated as linked to the earlier notional lease, and no further return or tax should be due if SDLT has already been paid on the full term.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Non-Residential Lease Agreement: Substantial Performance and SDLT Implications Explained

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