Does SDLT on a mixed-use purchase use commercial rates, and what if two connected companies buy different parts?

Introduction

Buyers often ask whether a property with both commercial and residential elements qualifies for mixed-use SDLT treatment. This matters because a genuinely mixed-use purchase is taxed at non-residential SDLT rates, which can be lower than residential rates. A further question often arises where the buyer is considering splitting the purchase between two companies, for example one company buying the commercial unit and another buying the flats. The key issues are whether the property is truly mixed-use, whether the transactions are linked or related, and how the SDLT rules apply in practice.

The Question

A buyer is looking at acquiring a property for about £1.25 million. The building consists of a ground-floor coffee bar and two residential flats above, which are intended to be let out. The buyer is considering either:

• buying the whole property through one company, or
• having one company buy the commercial unit and another connected company buy the flats.

The question is whether the purchase should be taxed at commercial SDLT rates because it is mixed-use, and whether using two companies changes the SDLT result because the transactions may be linked or related.

Nick’s Explanation

Nick’s view was that, on the facts described, the transaction appeared to be a mixed-use purchase and so the non-residential SDLT rates were likely to apply. He also noted that if two companies were used to acquire different parts of the same overall deal, the linked transactions rules would need to be considered.

In anonymised form, his point was essentially this: where a property includes a commercial unit and residential flats, the starting point is that the acquisition may fall within mixed-use treatment, so SDLT is generally calculated using the commercial rate structure. If two connected companies are used as part of the same overall acquisition, the transactions may still have to be looked at together under the linked transactions rules.

That is the right area of focus. The label used by the parties is not decisive. HMRC and the legislation look at the substance of what is being acquired and whether the transactions form part of a single scheme, arrangement or series of transactions.

The Law

SDLT is charged under Finance Act 2003. The broad distinction is between:

• residential property, and
• non-residential or mixed-use property.

If the subject matter of the transaction is mixed-use, the non-residential rate table applies rather than the residential rate table.

In broad terms, property is mixed-use if the transaction includes both:

• residential property, and
• non-residential property.

A shop, office, café, restaurant or similar business premises is non-residential property. Flats or dwellings are residential property. If both are acquired in the same transaction, the transaction will often be mixed-use.

The linked transactions rules in Finance Act 2003 are also important. Separate transactions can be treated as linked if they form part of a single scheme, arrangement or series of transactions between the same buyer and seller, or between connected persons in the relevant statutory sense. Where transactions are linked, the consideration may need to be aggregated to work out the SDLT rate.

Where companies are connected, simply splitting the acquisition into separate contracts or separate purchasing vehicles does not necessarily prevent aggregation if, in substance, the acquisitions are part of one overall arrangement.

Analysis

The analysis usually works in four stages.

First, identify exactly what is being bought. If the property consists of a commercial unit and two flats, that points strongly towards mixed-use treatment, provided the commercial unit is genuinely non-residential and is part of the same land transaction.

Second, check whether the purchase is one transaction or more than one. If one company buys the entire freehold or long leasehold interest in the whole building under one contract, and the building contains both commercial and residential elements, the transaction will generally be treated as mixed-use. In that case, non-residential SDLT rates usually apply to the whole chargeable consideration.

Third, if the purchase is split between two companies, examine whether the acquisitions are linked transactions. If one connected company acquires the coffee bar and another connected company acquires the flats as part of the same overall deal with the same seller, there is a real possibility that HMRC would treat them as linked. That means the total price may be aggregated for rate-setting purposes. The exact result depends on the structure, the contracts, the parties and whether the statutory linking conditions are met.

Fourth, do not assume that using two companies improves the SDLT position. It may not. In some cases it can create extra complexity without producing any SDLT saving. It can also raise wider legal and tax issues outside SDLT, such as financing, VAT, future transfers, group structure, and income or corporation tax treatment.

On the figures mentioned, a purchase price of about £1.25 million taxed at non-residential rates would broadly produce SDLT in the region of £52,000. That is consistent with the non-residential rate structure. But the correct answer still depends on the exact facts, especially:

• the legal title being acquired,
• whether the coffee bar is genuinely in commercial use at the effective date of transaction,
• whether the flats are self-contained dwellings,
• whether there is one contract or several, and
• whether the buyers and sellers are connected or acting under one arrangement.

It is also worth noting that mixed-use treatment is a different issue from the separate question of whether a dwelling is suitable for use as a dwelling. In uninhabitable or not suitable for use cases, the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. That authority makes clear that a property will not easily fall outside residential treatment merely because it needs repair or refurbishment. However, that line of authority is not the main issue here if the building genuinely includes a commercial unit as part of the acquisition.

Outcome

If a buyer acquires a building comprising a commercial unit and residential flats, the transaction will often qualify as mixed-use and therefore be taxed at non-residential SDLT rates. On the facts described, that appears to be the likely starting position.

If two connected companies are used to acquire different parts of the same overall property deal, the linked transactions rules may still apply. So splitting the purchase between companies does not automatically change the SDLT result and may not avoid aggregation.

Practical Steps

Before submitting the SDLT return, a buyer should gather and review:

• the full property address and title documents,
• the heads of terms and sale contract,
• any plan showing which parts are commercial and which are residential,
• evidence of the current use of the commercial unit,
• details of whether the flats are let, vacant or owner-occupied,
• the proposed buying entities and their relationship to one another, and
• whether there will be one contract, multiple contracts, or a conditional arrangement tying the deals together.

The SDLT analysis should then be tested in this order:

1. Is the subject matter of the acquisition genuinely mixed-use?
2. Is there one land transaction or several?
3. If several, are they linked transactions?
4. Does any part of the structure create further SDLT issues, such as higher rates, multiple dwellings issues, or anti-avoidance concerns?

If there is any uncertainty, the safest course is to review the documents in detail before completion rather than trying to correct the SDLT position afterwards.

Conclusion

A purchase of a building containing a coffee bar and two flats will often be taxed as mixed-use, so non-residential SDLT rates may apply. But if two connected companies buy separate parts under the same overall arrangement, the linked transactions rules may still bring the deals together. The correct SDLT outcome depends on the exact legal structure and the facts on the ground, not just on how the purchase is described.

Legal References Used

• Finance Act 2003
• Finance Act 2003, SDLT provisions on residential and non-residential property
• Finance Act 2003, linked transactions provisions
• Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799

This page was last updated on 22 March 2026.

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