Understanding SDLT Chargeability: Contracts, Substantial Performance, and Possession Criteria Explained

When a land contract is treated as substantially performed by taking possession

A land contract can trigger SDLT before legal completion if it is “substantially performed”. This commonly happens when the buyer is given real possession of the property, starts fitting it out, or becomes entitled to rent from a let property. What matters is the substance of the arrangement, not the label the parties give it.

• SDLT may arise before completion if the buyer gets a practical right to occupy the property as purchaser.
• HMRC’s view is that it does not matter whether early occupation is documented under the contract, a licence, or a temporary lease.
• Entry for fitting out can count as possession even if the buyer has not started trading yet.
• If the property is let, substantial performance can happen when the buyer becomes entitled to receive the rents.
• A tenant buying the freehold is not usually treated as taking possession at contract stage if they remain in occupation under the existing lease and keep complying with its terms.
• The key question is whether the buyer has genuinely obtained the benefits of ownership before completion, rather than just limited access for inspections or similar purposes.

Scroll down for the full analysis.

When a land contract is treated as substantially performed because the purchaser takes possession

This page explains an important SDLT timing rule. SDLT is not always triggered only on completion. If a buyer takes possession of the property before completion, the contract may be treated as “substantially performed”. That matters because SDLT can become chargeable at that earlier point.

What this rule is about

Under the SDLT rules for contracts, tax can be brought forward if the contract is substantially performed before the formal transfer or lease is completed. One of the main ways this happens is where the purchaser takes possession of the property.

The legal question is not just whether the buyer has physically entered the property. The real issue is whether the buyer has obtained the practical right to occupy it as purchaser. HMRC’s manual describes this as the purchaser getting “the keys to the door”.

This rule is aimed at situations where, in substance, the buyer has already taken the benefit of the property even though the legal completion has not yet happened.

What the official source says

HMRC’s manual says a contract is substantially performed where the purchaser obtains possession and is entitled to occupy the property, however that arrangement is documented.

The manual also says:

• it does not matter whether the purchaser takes possession under the contract itself or under a temporary licence or lease
• if the purchaser buys a let building, substantial performance occurs when the purchaser becomes entitled to receive the rents
• if the purchaser is already in occupation under a different legal interest, such as a tenant buying the freehold, substantial performance is not triggered at contract stage so long as the purchaser continues to comply with the lease covenants
• entry for fitting out counts as possession, and it does not matter whether trading has started

The source is HMRC manual guidance on Finance Act 2003, section 44(5)(a). The legislation is what governs the legal result. The manual explains HMRC’s view of how that provision applies.

What this means in practice

If a buyer is allowed into the property before completion in a way that gives them real occupation rights, SDLT may become due earlier than expected.

This often matters in transactions where:

• the buyer is given early access before completion
• the parties try to document occupation under a short licence pending completion
• a commercial buyer starts fitting out premises before completion
• an investment property is bought subject to tenants and the buyer starts collecting rent before legal completion

The practical point is that labels do not decide the SDLT position. Calling the arrangement a licence, side letter, or temporary lease does not prevent substantial performance if the buyer has in reality been given possession or the economic benefit of the property.

On the other hand, not every pre-completion presence amounts to substantial performance. The source draws an important distinction where the buyer is already in occupation under a separate existing interest, such as an existing lease. In that case, simply exchanging contracts to buy the freehold does not by itself trigger substantial performance, provided the buyer remains in occupation in the capacity of tenant and continues to observe the lease obligations.

How to analyse it

A sensible way to analyse the issue is to ask the following questions.

• Has the purchaser been given the right to occupy the property before completion?
• Is that right real and practical, rather than just limited access for inspection or similar purposes?
• Has the purchaser effectively received “the keys to the door”?
• If the property is let, has the purchaser become entitled to the rental income?
• If the purchaser was already in occupation, are they still occupying only under their old interest, such as a lease, rather than under the purchase contract?
• Has the purchaser entered for fitting out? If so, HMRC’s view is that this counts as possession even before trade begins.

When looking at the facts, focus on substance. The key points are entitlement to occupy and entitlement to the benefits of the property. The formal wording used by the parties is relevant evidence, but it is not conclusive.

Example

A company exchanges contracts to buy a shop unit, with completion due in two months. The seller allows the company into the unit immediately to install shelving, counters, and signage. The company has control of the unit for that purpose and can exclude others while the works are done. Even though the shop has not opened and legal completion has not yet taken place, HMRC’s published view is that entry for fitting out counts as possession. That means the contract may be substantially performed at that earlier point.

By contrast, suppose a tenant occupies premises under an existing lease and then agrees to buy the freehold. If the tenant simply continues to occupy under the lease and keeps complying with the lease covenants, HMRC’s manual says substantial performance is not triggered merely because the purchase contract has been exchanged.

Why this can be difficult in practice

The difficult cases are usually about the boundary between genuine possession and something less.

For example, a buyer may be allowed onto the property before completion for surveys, measuring up, or limited preparatory works. The source material clearly says that fitting out counts as possession, but it does not attempt to define every kind of access arrangement. That means the exact facts matter.

Another difficulty is where the buyer already has some right over the property. If they are already a tenant, licensee, or occupier in another capacity, it can be hard to tell whether their continued occupation remains under that old right or has shifted into possession as purchaser. HMRC’s guidance gives one clear safe point for a tenant buying the freehold while adhering to the lease covenants, but beyond that the analysis can become fact-sensitive.

There can also be practical risk where parties assume SDLT only arises on completion because no transfer deed has yet been executed. That assumption can be wrong if possession or rent entitlement has passed earlier.

Key takeaways

• For SDLT, a contract can become chargeable before completion if the purchaser takes possession.
• Temporary documentation does not prevent substantial performance if the buyer is in substance entitled to occupy.
• Entry for fitting out, or entitlement to rents on a let property, can be enough to trigger the rule.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Understanding SDLT Chargeability: Contracts, Substantial Performance, and Possession Criteria Explained

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