SDLT Calculation: Abnormal Rent Increases and Scottish Tax Changes

SDLT on Leases with Abnormal Rent Increases

SDLT on a lease can be charged on the rent as well as any premium, and special rules may apply if the rent rises in an unusual or “abnormal” way. The extract confirms the issue exists, but it does not give the full legal test or calculation method, so you need to check the detailed SDLT legislation or fuller HMRC guidance. It also highlights that SDLT does not apply to Scottish land transactions from April 2015 onwards, which fall under LBTT instead.

• SDLT on leases may depend on the pattern of rent payable over the term, not just any premium paid.
• If rent increases are treated as abnormal, a special calculation may apply to the rental element of SDLT.
• You should first check whether the transaction is actually within SDLT, or whether LBTT or LTT applies instead.
• For Scottish land transactions from April 2015 onwards, SDLT is replaced by LBTT.
• In practice, it is important to map the rent year by year, including stepped rents, reviews, concessions, and large jumps.
• The supplied material identifies the topic but does not set out the full rules, so further legal or HMRC guidance is needed.

Scroll down for the full analysis.

SDLT and abnormal rent increases: how the tax is calculated

This page explains a narrow SDLT point that can arise on leases where the rent increases in an unusual way. The official material here is very brief, but the issue matters because SDLT on leases is not based only on any premium paid. It can also depend on the rent payable over the term, and unusual rent patterns can affect that calculation.

What this rule is about

Under SDLT, the grant of a lease can be taxed by reference to the rent as well as any premium. In some cases, the rent does not rise in a normal or predictable pattern. The official source labels this as “abnormal rent increases”.

The practical point is that where rent increases are treated as abnormal, special calculation rules may apply when working out the SDLT charge on the rental element of the lease. This is part of the wider SDLT rules for lease consideration.

The source also notes an important territorial limit. From April 2015, SDLT no longer applies to land transactions in Scotland. Transactions involving Scottish land from that point are instead dealt with under Land and Buildings Transaction Tax, not SDLT.

What the official source says

The official page identifies the topic as the calculation of SDLT on rent where there are abnormal rent increases. It also states that the page is archived because SDLT ceased to apply to Scottish land transactions from April 2015, which are instead subject to LBTT.

The material supplied does not set out the detailed computational steps or the legal test for deciding when a rent increase is “abnormal”. So the source establishes the subject matter, but not the full rule in this extract.

What this means in practice

If you are dealing with a lease for SDLT purposes, you should not assume that all rent increases are treated in the same way. The pattern of rent over the lease term may matter.

In practice, this means you need to identify:

• whether the transaction is within SDLT at all, rather than LBTT or LTT
• whether the chargeable consideration includes rent
• whether the rent increases follow a pattern that the SDLT rules may treat as abnormal
• which calculation method the legislation requires for that kind of rent pattern

For Scottish land transactions from April 2015 onwards, this SDLT material is not the governing regime. The equivalent issue, if relevant, would need to be considered under LBTT rules instead.

How to analyse it

A sensible way to approach this issue is:

• Start with the location of the land and the effective date of the transaction. That tells you whether SDLT is the right tax.
• Confirm that the transaction is a lease grant, variation, or other lease event where rent is relevant to the tax calculation.
• Map out the rent payable year by year, including stepped rents, review clauses, concessions, and any large jumps.
• Ask whether the increase is simply part of the ordinary lease terms or whether the SDLT rules may categorise it as an abnormal increase requiring special treatment.
• Check the detailed SDLT legislation or fuller HMRC material for the actual computational rule, because the supplied extract does not include it.

This is important because lease SDLT calculations are highly mechanical. A small change in how the rent profile is classified can change the tax result.

Example

Illustration: a tenant takes a lease at a modest initial rent, but the lease provides for a sharp increase after a short period that is not just an ordinary fixed uplifts clause. When calculating SDLT on the rental element, the parties should not assume the standard approach automatically applies. They would need to check whether the increase falls within the SDLT rules on abnormal rent increases and, if so, apply the specific calculation required by those rules.

If the property is in Scotland and the transaction is from April 2015 onwards, this would not be an SDLT question. It would need to be considered under LBTT instead.

Why this can be difficult in practice

The main difficulty with the supplied source is that it names the issue but does not contain the operative detail. That means the label “abnormal rent increases” is clear, but the exact legal consequences are not available from this extract alone.

There can also be factual judgement in deciding how to characterise the rent pattern. Lease rents may change because of stepped increases, turnover arrangements, rent reviews, concessions, side agreements, or variations. Whether a particular increase is treated as abnormal for SDLT purposes depends on the detailed statutory rules, not just on whether it looks unusual in commercial terms.

A further complication is that SDLT no longer applies to Scottish land transactions from April 2015. So older SDLT material may still be relevant historically, but not for later Scottish transactions.

Key takeaways

• Abnormal rent increases are a specific SDLT lease-calculation issue, not just a general description of rent going up sharply.
• The supplied source confirms the topic and the Scotland carve-out, but not the full calculation rule.
• For Scottish land transactions from April 2015, look to LBTT rather than SDLT.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: SDLT Calculation: Abnormal Rent Increases and Scottish Tax Changes

View all HMRC SDLT Guidance Pages Here