Example of Tax Calculation for Linked Leases on House and Garage

SDLT on linked leases in a single scheme

When two or more leases are linked because they form part of one arrangement, SDLT is not always worked out for each lease separately. Instead, the net present values (NPVs) of the rents may need to be added together, and any tax is then allocated between the leases based on their relative NPVs, using the threshold in force on each lease’s effective date.

• Linked lease transactions must be considered together, so a lease below the SDLT threshold on its own can still become taxable.
• The usual method is to calculate each lease’s NPV, add them to get a total NPV, and test that total against the SDLT threshold for each lease.
• Any SDLT due is not charged twice; it is apportioned between the leases according to each lease’s share of the total NPV.
• In the example, the house lease and garage lease had a combined NPV of £62,343, which created SDLT on the house lease but none on the garage lease because different thresholds applied on their different effective dates.
• A later linked lease can change the SDLT position of an earlier lease, so notification, amendment or further filing obligations may need to be checked.
• The example uses historic 2005 thresholds, but the main legal point remains that linked leases are aggregated and the resulting tax is apportioned.

Scroll down for the full analysis.

Linked leases under a single scheme: how SDLT is worked out when leases are connected

This page explains how Stamp Duty Land Tax can apply where two leases are linked because they form part of a single scheme, arrangement or series of transactions. The main point is that each lease is not always taxed in isolation. If the leases are linked, their values may need to be added together when deciding whether SDLT is due and how much is attributable to each lease.

What this rule is about

For SDLT on leases, the charge is often based on the net present value, usually shortened to NPV, of the rent payable over the term. In some cases, two or more transactions are treated as linked transactions. Where that happens, the tax rules do not simply ask whether each lease, viewed alone, falls below the relevant SDLT threshold.

Instead, the linked transactions rules require the leases to be aggregated. This is designed to stop the SDLT result being distorted where what is really one connected arrangement has been split into separate transactions.

The example in the official material deals with two leases granted close together: one for a house and one for a neighbouring garage. Each lease would have fallen below the threshold if looked at separately. But because they are linked, the combined NPV is used to test the SDLT position.

What the official source says

The official example says:

• A ten-year lease of a house is granted on 1 March 2005 at £7,000 a year rent.
• A ten-year lease of the neighbouring garage is granted on 1 April 2005 at £500 a year rent.
• Both leases end on 28 February 2015.

The house lease has an NPV of £58,216. The garage lease has an NPV of £4,127. The total NPV of the linked leases is therefore £62,343.

For the house lease, the official example applies the threshold in force on 1 March 2005. On that date, the threshold used in the example is £60,000. So the amount above the threshold is £2,343, taxed at 1%, giving total tax of £23.43 on the linked amount.

That total tax is then apportioned to the house by reference to the fraction:

house NPV ÷ total NPV

So the tax attributed to the house is:

£23.43 × £58,216 ÷ £62,343 = £21.86

No tax had already been paid, so £21.86 is the amount due on the house calculation.

For the garage lease, the same total NPV of £62,343 is considered, but the threshold in force on 1 April 2005 is used. In the example, that threshold is £120,000. Since the total NPV is below that threshold, no SDLT is attributable to the garage.

The official material also states that, for notification purposes, the effective date is 1 April 2005.

What this means in practice

The practical effect is that a later lease can change the SDLT position of an earlier one if the transactions are linked.

Here, the house lease did not produce a charge when looked at on its own. The garage lease also did not produce a charge when looked at on its own. But once the two leases were treated as linked, the combined NPV crossed the threshold relevant to the first lease, so tax became payable on part of the overall arrangement.

The example also shows an important feature of the linked transactions rules for leases: the total tax is not simply charged twice. Instead, the combined tax result is apportioned between the leases by reference to their relative NPVs.

It also matters that the threshold can differ depending on the effective date of the particular lease being assessed. In this example, the threshold had changed between 1 March 2005 and 1 April 2005. That is why the house bears some tax while the garage bears none, even though both are part of the same linked arrangement.

How to analyse it

If you are dealing with more than one lease and think they may be linked, a sensible approach is:

• First, identify whether the leases are linked transactions. The example assumes they are linked because they form part of a single scheme or arrangement.
• Work out the NPV of each lease separately.
• Add the NPVs together to find the total NPV of the linked leases.
• For each lease, apply the threshold in force at that lease’s effective date, using the total NPV rather than only that lease’s own NPV.
• Calculate the total tax that would arise on that basis.
• Apportion that tax to the particular lease by using that lease’s NPV as a fraction of the total NPV.
• Deduct any SDLT already paid in relation to that lease calculation if the legislation requires that step.
• Check the notification position, especially where a later linked transaction changes the earlier SDLT analysis.

The key question is not just “does this lease exceed the threshold on its own?” but also “is there another linked lease or transaction that must be taken into account?”

Example

Illustration based on the official example:

A tenant first takes a lease of a house for ten years. One month later, after further negotiation, the same tenant takes a lease of the garage next door for the same period. If the two leases are linked, the rent values are not tested separately for threshold purposes.

The combined NPV is £62,343. For the house lease, the threshold at its effective date is £60,000, so there is £2,343 above the threshold. At 1%, that gives £23.43 total tax on the linked amount. Most of that is attributed to the house because almost all of the total NPV relates to the house. The result is SDLT of £21.86 on the house lease.

For the garage lease, the threshold at its later effective date is £120,000, so the same combined NPV does not exceed the threshold. No SDLT is attributed to the garage.

Why this can be difficult in practice

The arithmetic in the example is straightforward. The harder issue is often deciding whether the leases are linked at all. The official page assumes that point rather than analysing it. In real cases, that can be fact-sensitive.

Another difficulty is timing. A later transaction can affect the SDLT treatment of an earlier one, and different effective dates may bring different thresholds into play. That means the answer may depend not only on the economic substance of the arrangement, but also on when each transaction became effective.

There can also be procedural consequences. If a later linked transaction changes the SDLT position, you may need to consider whether a return, amendment or further notification is required. The example notes the notification effective date, but does not set out the wider compliance steps.

Finally, this is a historic example using thresholds in force in 2005. The legal point about aggregation and apportionment remains the important feature. The actual thresholds and rates depend on the law in force at the relevant time.

Key takeaways

• Linked leases are not always taxed separately; their NPVs may need to be aggregated.
• A lease that would be below the threshold on its own can still bear SDLT because of a linked lease.
• When leases are linked, tax is worked out on the combined amount and then apportioned between the leases by reference to their NPVs.

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 Leases on House and Garage

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