Example of Tax Calculation for Linked Non-Residential Leases Pre-SDLT Implementation

Linked leases where one lease was granted before SDLT

Where two non-residential leases are linked as part of a single scheme, a lease granted before SDLT began can still affect the SDLT due on a later lease. The method is to calculate the net present value (NPV) of both leases, add them together, work out the tax on the combined figure using the rules in force when the later lease took effect, and then split that tax between the leases by their NPVs. Only the part allocated to the lease within SDLT is actually payable.

• A pre-SDLT lease is not itself charged to SDLT, but its NPV can still increase the SDLT on a later linked lease.
• The leases must first be shown to be genuinely linked, for example because they form part of a single scheme under Finance Act 2003, section 108.
• In the official example, NPVs of £80,000 and £120,000 are combined to £200,000, producing total tax of £500 under the 1 June 2005 rules.
• That £500 is apportioned by NPV ratio 80:120, so £200 is attributed to the earlier lease and £300 to the later lease.
• No SDLT is payable on the earlier lease, so the SDLT due is £300 on the later lease, with notification based on its effective date.
• In practice, the main issues are proving the leases are linked and calculating the NPV of the earlier lease, which may need to be done manually.

Scroll down for the full analysis.

Linked leases under a single scheme: how a pre-SDLT lease affects a later SDLT lease

This page explains what happens when two non-residential leases are linked because they form part of a single scheme, but one lease was granted before SDLT started and the other was granted afterwards. The point matters because the earlier lease can still affect the SDLT calculation on the later lease, even though the earlier lease itself was not subject to SDLT.

What this rule is about

SDLT has special rules for linked transactions. Where leases are linked, you do not always look at each lease in isolation. Instead, you may need to look at the transactions together and work out the tax position on a combined basis.

The source material deals with an awkward transitional case. One lease was granted on 1 November 2003, when stamp duty still applied. A second lease of different premises was granted on 1 June 2005, when SDLT applied. The leases are not successive leases of the same premises, but on the facts they are treated as linked because they are part of a single scheme under Finance Act 2003, section 108.

The practical question is this: if the first lease was not itself an SDLT lease, how far does it still affect the SDLT due on the second lease?

What the official source says

The official example says that you must calculate the net present value, or NPV, of both leases and aggregate them, even though the earlier lease was granted before SDLT began.

In the example:

• the NPV of shop 1, granted on 1 November 2003, is £80,000
• the NPV of shop 2, granted on 1 June 2005, is £120,000
• the total NPV is therefore £200,000

The source then says to ignore any tax that would have been chargeable on shop 1, because that lease was a stamp duty lease rather than an SDLT lease.

For shop 2, you calculate the tax that would be chargeable if the linked leases were a single transaction. Using the threshold in force on 1 June 2005, the tax on the combined NPV of £200,000 is:

• £200,000 less £150,000 threshold = £50,000
• £50,000 at 1% = £500

That total tax is then apportioned between the leases by reference to their NPVs. Since the NPVs are £80,000 and £120,000, the ratio is 80:120.

On that basis:

• £200 is attributed to shop 1
• £300 is attributed to shop 2

The source is clear that the amount attributed to shop 1 has no SDLT effect, because shop 1 was granted before SDLT. The SDLT due is therefore £300 in respect of shop 2. For notification purposes, the effective date is 1 June 2005.

What this means in practice

The key practical point is that a pre-SDLT lease can still increase the SDLT payable on a later linked lease.

That may seem surprising, because the earlier lease was never within SDLT. But where the later lease is linked to it, the earlier lease is still brought into the combined calculation through its NPV. The earlier lease is relevant to working out the overall tax burden on the linked arrangement, even though no SDLT is actually charged on that earlier lease.

So the process has two stages:

• first, work out the total tax on the linked leases as if they formed a single transaction
• second, split that total tax between the leases in proportion to their NPVs

Only the share attributed to the SDLT lease is actually payable under SDLT in this example.

This matters most where the earlier lease pushes the total NPV above the relevant threshold. Without the earlier lease, the later lease might produce little or no SDLT. With the earlier lease included, the later lease can bear a larger SDLT charge.

How to analyse it

If you are dealing with linked leases in a transitional period, a sensible way to analyse the issue is:

• Identify whether the leases are genuinely linked. In this example, they are linked because they form part of a single scheme, not because they are successive leases of the same property.
• Check the dates carefully. You need to know which lease falls before SDLT and which falls within SDLT.
• Work out the NPV of each lease. The source notes an important practical problem here: for a pre-SDLT lease, NPV was not a stamp duty concept, so the SDLT calculator may not do this for you. It may need to be calculated manually.
• Aggregate the NPVs of the linked leases.
• Apply the SDLT rules in force at the effective date of the later SDLT lease to the combined figure.
• Apportion the total tax between the leases by reference to their individual NPVs.
• Charge SDLT only on the amount attributed to the lease that is actually within SDLT.
• Use the effective date of the SDLT lease for notification purposes.

The source example is specifically about non-residential leases and about linkage through a single scheme. Those facts matter. You should not assume the same mechanics apply in exactly the same way to different facts without checking the relevant rules.

Example

Illustration based on the official example:

A business takes a lease of shop 1 in November 2003 and, as part of the same overall commercial arrangement, takes a lease of shop 2 in June 2005. The leases are of different premises, but the facts show they are part of a single scheme, so they are linked.

The NPV of shop 1 is £80,000. The NPV of shop 2 is £120,000. Combined, that gives £200,000.

Using the threshold in force on 1 June 2005, the tax on the combined NPV is £500. That £500 is split in the ratio 80:120:

• shop 1 is allocated £200
• shop 2 is allocated £300

No SDLT is charged on shop 1 because it was granted before SDLT applied. SDLT of £300 is due on shop 2.

Why this can be difficult in practice

The first difficulty is deciding whether the leases are in fact linked as part of a single scheme. That is a factual question. The source assumes the linkage has already been established. In real cases, that can be the main area of dispute.

The second difficulty is the NPV calculation for the earlier lease. Because pre-SDLT leases were not taxed by reference to NPV, the figure may not already exist in the transaction records, and the standard SDLT tools may not calculate it automatically.

The third difficulty is that transitional cases can feel counterintuitive. A taxpayer may assume that a pre-SDLT lease is irrelevant to SDLT because it was outside the regime. The source shows that this is not necessarily correct where linked transaction rules apply.

The final point is that the example is narrow. It shows the mechanics for one fact pattern. It does not attempt to resolve every possible transitional or linked-lease issue.

Key takeaways

• A lease granted before SDLT can still affect the SDLT payable on a later lease if the leases are linked.
• In the example, you aggregate the NPVs, calculate the total tax on that basis, and then apportion the tax by reference to each lease’s NPV.
• The pre-SDLT lease does not itself bear SDLT, but it can increase the SDLT due on the later lease.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Example of Tax Calculation for Linked Non-Residential Leases Pre-SDLT Implementation

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