Example of Calculating Stamp Duty Land Tax for Variable Rent

SDLT on Lease Rent That Is Variable or Uncertain

This archived HMRC material refers to how SDLT may be calculated when lease rent is not fully known when the lease starts. The missing example does not give the full method, but it shows that special care is needed where rent depends on future events, formulas or contingencies, and that the guidance is not current for Scottish land transactions from April 2015 onwards, where LBTT applies instead.

• SDLT on leases can include tax on rent, and the calculation is usually simpler where the rent is fixed from the outset.
• If rent is variable or uncertain at the effective date, the tax treatment may differ from a lease with a known rent schedule.
• It is important to distinguish between rent that is genuinely uncertain and rent that can still be worked out from the lease terms.
• Common problem areas include turnover rent, rent review clauses, index-linked rent, stepped rents and amounts depending on future events.
• The archived HMRC page only identifies the topic, so it should not be treated as a complete statement of the law or current HMRC practice.
• For Scottish land transactions from April 2015, SDLT no longer applies and the relevant tax is generally LBTT.

Scroll down for the full analysis.

SDLT on variable or uncertain rent: understanding the archived HMRC example

This page concerns an older SDLT rule about rent that is not fixed at the start of a lease. Although the source text here is only a heading for an archived HMRC example, the underlying issue is important: when lease rent is variable or uncertain, SDLT is not always worked out in the same way as it would be for a lease with a fixed rent schedule.

What this rule is about

For SDLT purposes, rent under a lease can form part of the chargeable consideration. Where the rent is known in advance, the tax calculation is usually based on that known rent. The difficulty arises where the lease says the rent may change in a way that cannot be fixed with certainty when the lease is granted.

The archived HMRC page title shows that this part of the manual was dealing with an example of “variable or uncertain rent”. That points to a calculation issue rather than a special relief or exemption. The legal question is how SDLT should be calculated when the rent payable over the lease term is not fully known at the effective date of the transaction.

What the official source says

The supplied source does not contain the body of the example. It identifies only that this was HMRC manual page SDLTM18570, under the topic “Calculation of stamp duty land tax: Rent: Variable or uncertain rent: Example 1”. It also states that the page is archived and notes that, from April 2015, SDLT no longer applies to land transactions in Scotland, which instead fall under Land and Buildings Transaction Tax.

From that, two points can safely be taken:

• the page formed part of HMRC’s SDLT guidance on calculating tax where lease rent is variable or uncertain; and
• the page is part of the pre-2015 SDLT material for Scotland and should not be read as current Scottish transaction tax guidance.

What this means in practice

If lease rent is variable or uncertain, the SDLT calculation may require more than a simple reading of the lease’s initial rent clause. The practical task is to identify whether the rent can be treated as known at the outset, or whether it depends on future events, turnover, reviews, formulas, or contingencies that make the total rent uncertain when the lease is granted.

This matters because SDLT on lease rent is tied to the rent actually relevant under the legislation and HMRC’s approach to uncertain or variable amounts. If the rent cannot be fixed at the start, the calculation may need to proceed on a basis set by the legislation for uncertain consideration, with later adjustment if the position becomes clear. The exact method cannot be reconstructed from the heading alone, so care is needed not to assume too much from this archived page by itself.

The archive warning also matters. For transactions involving Scottish land from April 2015 onwards, SDLT is not the relevant tax. The equivalent question would arise, if at all, under LBTT rather than SDLT.

How to analyse it

When looking at a lease with non-fixed rent, the sensible questions are:

• Is the transaction within SDLT at all, or is it in Scotland and therefore potentially within LBTT for post-April 2015 transactions?
• Is the rent genuinely uncertain at the effective date, or is it actually ascertainable from the lease terms?
• What makes the rent variable: review provisions, turnover rent, indexation, stepped increases, contingent events, or something else?
• Does the legislation treat that type of rent as uncertain consideration, or as rent that can still be calculated under a defined formula?
• Is a later return amendment, further return, or recalculation required once the rent position becomes known?

The key analytical point is that “variable” and “uncertain” are not always the same thing in practice. Some rent changes are built into the lease and can be modelled from day one. Others depend on future facts that are not yet known. The tax treatment may differ depending on that distinction.

Example

Illustration: a tenant takes a lease under which the rent is the higher of a fixed base rent and a percentage of annual shop turnover. At the grant date, the future turnover figures are unknown. That raises the question whether the rent, for SDLT purposes, is partly uncertain when the lease is granted. An HMRC example under this heading would likely have been directed at that kind of issue: how to calculate SDLT where the final rent liability depends on future events rather than a fixed schedule.

Why this can be difficult in practice

The main difficulty is classification. A lease may contain a rent formula that looks uncertain commercially, but may still be sufficiently defined for tax purposes. Equally, a clause may appear mechanical but still depend on facts that are unknown at the effective date.

A second difficulty is that this source is only a page heading. It signals the topic, but not the worked example itself. So it should not be used as a complete statement of the law or HMRC practice. The detailed legislative rules, and any fuller HMRC guidance on uncertain or contingent consideration for leases, would need to be checked before drawing conclusions on a real transaction.

A third difficulty is jurisdiction and date. Because the page is archived and specifically notes the end of SDLT for Scottish land transactions from April 2015, readers must not assume that this material applies unchanged across SDLT, LBTT, and LTT.

Key takeaways

• This archived HMRC page relates to SDLT calculation where lease rent is variable or uncertain.
• The supplied text does not include the actual example, so it identifies the issue but does not provide the full rule or method.
• For Scottish land transactions from April 2015 onwards, SDLT is not the relevant tax; LBTT applies instead.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Example of Calculating Stamp Duty Land Tax for Variable Rent

View all HMRC SDLT Guidance Pages Here