Can you apportion the price between residential and commercial parts for SDLT, or does mixed-use apply?

Introduction

Buyers of estates, farms and other properties with both residential and non-residential elements often face a common SDLT question: should the purchase price be split between the residential and commercial parts, or must the whole transaction be taxed as mixed-use?

This matters because the SDLT difference can be very large. A buyer may receive different views from advisers, especially where there is a house together with land, buildings or areas used for business or agricultural purposes. The key issue is not whether a valuer can apportion the price, but how the legislation classifies the transaction.

The Question

A buyer was purchasing a rural estate for about £2.95 million. A surveyor had attributed roughly £2 million of the value to the residential element and about £950,000 to the commercial or non-residential element. The buyer wanted to know whether SDLT could be calculated by apportioning the consideration between those two parts, or whether the whole purchase should be treated as mixed-use.

The buyer also wanted to know what evidence would be needed to support a mixed-use SDLT return if HMRC later asked questions.

Nick’s Explanation

Nick’s central point was that where one land transaction includes both residential and non-residential property, SDLT is not normally calculated by taxing each part separately. Instead, the whole transaction is treated as mixed-use and charged at the non-residential rates.

In anonymised form, his explanation was:

“If any part of the property is non-residential, the whole transaction is assessed using the non-residential rates. Apportioning the price between the residential and commercial parts and taxing them separately is not permitted in these circumstances.”

He also explained that, on a purchase price of £2.95 million, the SDLT figures would be very different depending on the classification used.

• Residential rates on the full price: £267,750
• Residential rates with the higher rates for additional dwellings: £415,250
• Mixed-use rates on the full price: £137,000

Nick further noted that if the buyer files on a mixed-use basis, HMRC is likely to look carefully at the return where the tax saving is significant. He said that clear evidence of the non-residential use should be kept, such as photographs, agreements, and business records. After reviewing the supporting report obtained by the buyer, he considered it “a fairly conclusive report” and said there was “a very strong argument” for mixed-use treatment.

The Law

SDLT is charged under the Finance Act 2003. The starting point is that SDLT applies to a “land transaction” involving the acquisition of a chargeable interest in land.

The key provisions referred to in Nick’s explanation are:

• Finance Act 2003, section 43, which defines a land transaction
• Finance Act 2003, section 48, which explains what counts as residential property and, by contrast, what is non-residential property

For SDLT purposes, a transaction is generally treated as non-residential or mixed-use if the subject matter consists of or includes land that is not residential property. In practical terms, if the purchase includes both a dwelling and genuine non-residential property, the non-residential SDLT rate table applies to the whole chargeable consideration.

That is different from saying that a valuer cannot identify how much value lies in different parts of the property. A valuation apportionment may be useful evidence of what is being bought, but it does not usually change the SDLT charging rule for a single mixed-use transaction.

Where a buyer argues that a dwelling was uninhabitable and therefore not residential property, the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. The courts now take a stricter approach to claims that a building was not suitable for use as a dwelling at the effective date of the transaction.

Analysis

The analysis usually works in four steps.

First, identify exactly what is being bought in the single transaction. If the contract covers one estate, title or package that includes a house and also land or buildings used for a non-residential purpose, that points towards a mixed-use transaction.

Second, ask whether the non-residential element is real and substantive. Examples may include commercial premises, agricultural land used in a genuine farming business, let offices, workshops, yards, or land occupied for business purposes. The question is one of fact and evidence.

Third, if the transaction includes both residential and non-residential property, apply the non-residential SDLT rates to the whole consideration. In that situation, the legislation does not usually allow the buyer to split the purchase price and charge part at residential rates and part at non-residential rates.

Fourth, consider whether the evidence is strong enough to support the classification if HMRC opens an enquiry. A surveyor’s or land agent’s report can be important, but it is usually better if it is backed up by objective material showing the actual use of the non-residential parts at the relevant date.

On the figures given here, the practical effect is clear. If the whole £2.95 million were taxed as residential, the SDLT would be £267,750 at standard residential rates. If the higher rates for additional dwellings applied, the figure would rise to £415,250. If the purchase is properly mixed-use, the SDLT on the same £2.95 million would be £137,000 using non-residential rates.

That difference explains why HMRC often examines mixed-use claims closely. The issue is not whether the buyer has a valuation showing separate figures for the house and the commercial parts. The real issue is whether the property acquired genuinely included non-residential land or buildings within the meaning of the Finance Act 2003.

If the buyer also considered arguing that the dwelling was not suitable for use as a dwelling, that would need separate analysis. Since Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the condition threshold for “unsuitable for use” arguments is relatively high. Ordinary disrepair, outdated condition, or the need for renovation will often not be enough.

Outcome

Where a single purchase includes both residential and non-residential property, the usual SDLT position is that the whole transaction is mixed-use and the non-residential rates apply to the full price.

In that situation, a buyer should not normally calculate SDLT by apportioning the price and taxing the residential part separately from the commercial part.

If there is solid evidence that part of the property was genuinely non-residential at the effective date, a mixed-use filing position can be strong. A professional report supporting that conclusion can be helpful, especially when combined with documents showing actual use.

Practical Steps

If you are assessing a similar purchase, the sensible next steps are:

1. Review the contract, title documents and sale particulars to identify exactly what is included in the transaction.
2. List each part of the property and its actual use at completion, not just its appearance or potential use.
3. Gather evidence of non-residential use, such as tenancy agreements, grazing or farming arrangements, business records, invoices, photographs, plans, and professional reports.
4. Check whether the non-residential element is substantial and genuine, rather than incidental to the dwelling.
5. Calculate the SDLT on the correct basis for the whole transaction once classification is settled.
6. Keep a full file explaining why mixed-use treatment was adopted, in case HMRC opens an enquiry.
7. If anyone suggests that the dwelling was uninhabitable, test that carefully against the stricter approach confirmed in Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

Conclusion

A valuation split between residential and commercial elements does not usually mean SDLT can be charged separately on each part. If one transaction includes both residential and non-residential property, the normal rule is that the whole purchase is treated as mixed-use and taxed at non-residential rates. The crucial point is evidencing the non-residential element properly.

Legal References Used

• Finance Act 2003, section 43
• Finance Act 2003, section 48
• 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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