Can business use or commercial finance make a flat non-residential for SDLT?

Introduction

People often ask whether a property can be taxed at non-residential Stamp Duty Land Tax (SDLT) rates because it was bought for business purposes, financed with a commercial loan, or used like an office. This question usually comes up where the property is a flat or house that the buyer says was not actually being lived in.

The key point is that SDLT treatment does not usually depend on why the buyer bought the property or how the purchase was funded. The legal question is whether the property was a “dwelling”, was suitable for use as a dwelling, or formed part of mixed-use land at the effective date of the transaction.

The Question

A buyer purchased a flat and wanted to argue that non-residential SDLT rates should apply. The buyer’s position was broadly that:

• the purchase was for purely commercial purposes;
• the funding included commercial-style lending arrangements;
• the property had been occupied by a company and appeared to contain office furniture rather than normal residential furniture;
• the buyer had applied for business rates; and
• the surrounding street had a strong commercial character.

The practical question was whether those points were enough to support a reclaim or amendment on the basis that the flat should be treated as non-residential rather than residential for SDLT.

Nick’s Explanation

Nick’s central point was that SDLT classification turns on the nature of the property itself, not on the buyer’s funding arrangements or business intentions.

In anonymised form, his explanation was:

“A property’s classification as a dwelling or otherwise is generally determined by its characteristics and use, not by the method of purchase or type of finance used.”

He also explained that commercial borrowing may sometimes support the factual picture, but it is not the legal test:

“That type of financing can support the non-residential classification, but the core argument must rest on the property’s actual use and configuration.”

Nick further noted that a live/work unit can be mixed-use where there is genuine non-residential use alongside residential accommodation. But simply saying that a flat was bought for business purposes is not enough.

He also warned that HMRC may process a reclaim before checking it in detail, and that weak evidence can lead to a later enquiry and repayment demand. That is an important practical point in SDLT cases.

The Law

The starting point is Finance Act 2003. SDLT applies different rate structures to:

• residential property;
• non-residential property; and
• mixed-use property.

For these purposes, a dwelling broadly means a building, or part of a building, that is used or suitable for use as a dwelling, or is in the process of being constructed or adapted for such use.

That wording matters. A property can still be residential even if nobody is living there at the time. Actual occupation is not always required. A vacant flat may still be a dwelling if it remains suitable for residential use.

Likewise, a buyer’s intended use after completion does not necessarily change the SDLT position at the effective date of the transaction. SDLT looks at the legal and factual status of the property at the relevant time.

If the argument is that the property was not suitable for use as a dwelling, the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. The Court of Appeal confirmed that the condition needed to take a property outside dwelling status is substantial. Disrepair, lack of occupation, or the need for works will not automatically be enough. The question is whether the property was truly not suitable for use as a dwelling at the effective date.

If the argument is mixed-use, there must usually be genuine non-residential property or rights forming part of the transaction. A separate and real non-residential element is required. Mere business intention, or the fact that the buyer plans to run a business from the property, will not by itself create mixed-use treatment.

Analysis

Applying those rules step by step:

1. The fact that the property was a flat points strongly toward residential treatment unless there is clear evidence to the contrary. A flat is ordinarily designed for residential occupation.

2. The fact that the buyer used commercial borrowing, or secured finance against other commercial assets, does not determine SDLT classification. Finance structure is not the statutory test.

3. The fact that the buyer intended to use the flat for business purposes also does not settle the issue. SDLT is not charged by reference to the buyer’s commercial motive.

4. The claim that the property contained office furniture and was company-occupied may be relevant evidence, but it is not conclusive. A residential property can be temporarily used as office space without losing its essential character as a dwelling if it remains suitable for residential use.

5. An application for business rates may help show asserted business use, but it is not decisive for SDLT. Rating treatment and SDLT treatment are separate legal regimes.

6. The commercial character of the surrounding street is also only background evidence. A flat in a commercial area can still be a dwelling.

7. If the argument is that the property was “not used as a dwelling”, that is usually too narrow on its own. The statutory wording also asks whether it was “suitable for use as a dwelling”. A vacant or office-furnished flat may still be suitable for residential use.

8. If the argument is that the property was “not suitable for use as a dwelling”, the evidential burden is much heavier after Mudan. The buyer would need strong evidence of real physical condition or configuration problems that prevented residential use at the effective date.

9. If the argument is mixed-use, the evidence would need to show a real non-residential element in the transaction itself, not just a residential flat being used for business purposes.

On the facts described, the strongest evidence mentioned was business-style occupation and office furniture. That may support an argument, but it does not by itself answer the legal test. Unless the flat had been physically configured so that it was no longer suitable for residential use, or unless the transaction genuinely included non-residential land or rights, HMRC would be likely to view it as residential property.

Outcome

The practical conclusion is that commercial purpose and commercial finance do not by themselves make a flat non-residential for SDLT.

A buyer in this position would need to show one of the following:

• the property was not suitable for use as a dwelling at the effective date, applying the now demanding threshold confirmed in Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799; or
• the transaction was genuinely mixed-use because it included a real non-residential element.

If neither point can be properly evidenced, residential SDLT rates are likely to apply.

Practical Steps

If you are assessing a similar case, gather evidence in a structured way before making any reclaim or amendment:

• obtain the contract, TR1, SDLT5 and completion statement;
• collect dated photographs showing the condition and layout of the property at or close to completion;
• identify whether the property had a kitchen, bathroom, sleeping space, utilities and normal residential access;
• check whether any physical alterations had made residential occupation impossible or unrealistic;
• obtain planning, licensing, rating and title documents, but treat them as supporting material rather than decisive proof;
• consider whether the transaction included any separate non-residential land, premises or rights;
• review whether the argument is really about mixed-use, unsuitability for use as a dwelling, or simply intended business use;
• test the evidence against current case law, especially Mudan, before filing anything with HMRC.

If a claim is made without strong evidence, HMRC may still open an enquiry later. That can lead to repayment of the tax difference, with possible interest and further dispute.

Conclusion

For SDLT, the important question is not why the buyer bought the property or how the purchase was financed. The key issue is whether the property was a dwelling, suitable for use as a dwelling, or genuinely mixed-use at the effective date. In the case of a flat, that is often difficult to displace without strong factual evidence.

Legal References Used

• Finance Act 2003
• Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799
• Deregulation Act 2015

This page was last updated on 22 March 2026.

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