Can you reclaim SDLT if a property should have been treated as non-residential or not suitable for use as a dwelling?

Introduction

Buyers sometimes discover after completion that the Stamp Duty Land Tax (SDLT) paid on a purchase may have been too high. A common example is where the property was taxed as residential property, but there is an argument that it should instead have been treated as non-residential, or that it was not suitable for use as a dwelling on the effective date of the transaction.

Another frequent issue is that the SDLT figure produced by a later review does not match the amount that was actually paid at completion. Readers often want to know whether the difference can also be reclaimed, what evidence is needed, and how HMRC will assess the claim.

The Question

A buyer purchased a property and paid SDLT on the basis that it was a residential purchase, with the higher rates applying because another dwelling was already owned. After reviewing the condition of the property, the buyer wanted to know whether the transaction might instead qualify for non-residential SDLT treatment, producing a substantial refund.

The buyer also asked two practical questions:

• if the SDLT originally paid was higher than the later recalculation, could the full difference potentially be reclaimed; and
• whether there would be any additional costs beyond an agreed percentage-based fee arrangement for handling the reclaim.

Nick’s Explanation

Nick’s core point was that any reclaim should be based on the SDLT actually paid, not just on an estimate. In anonymised form, his explanation was:

“I always work from the completion statement showing the actual stamp duty paid when making a reclaim. Unless I see the exact calculations used for the property, it is difficult to know why two figures are different.”

That is an important practical point. A later SDLT review may suggest a lower figure, but the starting point is always the amount shown on the SDLT return and the completion paperwork. If too much tax was paid, the claim is normally framed by reference to the actual overpayment.

Nick also indicated that a proper review of the evidence was essential, including the SDLT filing record and the conveyancing documents. He referred in particular to documents such as:

• the SDLT5 certificate;
• the TR1 transfer;
• the solicitor’s completion statement; and
• the contract for sale.

He further noted that the strength of any argument would depend on the quality of the evidence about the property’s condition at the relevant time.

The Law

SDLT is charged under the Finance Act 2003. The amount due depends on the chargeable consideration and the type of property acquired.

The key distinction here is between:

• residential property, which is generally taxed at residential rates and may also attract the higher rates for additional dwellings; and
• non-residential property, which is taxed under a different rate structure.

The principal statutory provisions are found in Part 4 of the Finance Act 2003, including the definitions of residential property and the charging provisions for SDLT. Where a property is not “residential property” for SDLT purposes, the non-residential rates may apply.

One route sometimes explored is the argument that the building was not suitable for use as a dwelling at the effective date of the transaction. If that argument succeeds, the property may fall outside the SDLT definition of residential property.

However, the legal threshold is now relatively high. In uninhabitable or not suitable for use cases, the position has become more restrictive following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. That Court of Appeal decision confirms that serious disrepair alone will not automatically prevent a building from being treated as residential property. The question is whether, viewed realistically at the effective date, the building was suitable for use as a dwelling. The threshold for showing that it was not is now comparatively demanding.

In practice, this means that many claims based on poor condition, missing fittings, damp, outdated services, or a need for renovation may no longer be enough unless the facts show a genuinely high level of disrepair or unsuitability at completion.

Where too much SDLT has been paid, an amendment or reclaim may be possible, subject to the statutory time limits and HMRC procedure.

Analysis

The correct analysis usually involves four stages.

1. Identify what was actually filed and paid

   The first step is to confirm the SDLT return submitted on completion and the exact amount paid to HMRC. This is why the completion statement and SDLT5 matter. If the amount paid was, for example, higher than a later estimate, the reason may be that the original return used different assumptions, included a surcharge, or contained an error.

2. Work out the correct SDLT treatment

   The next step is to decide whether the property was correctly treated as residential. If the property was genuinely non-residential, or if it was not suitable for use as a dwelling at the effective date, non-residential rates may apply instead. That can produce a significant reduction in SDLT.

   But after Mudan, this is not a low bar. A property in poor condition is not necessarily outside the residential rules. The evidence must support the conclusion that it was not suitable for use as a dwelling at the relevant date.

3. Compare the tax actually paid with the tax properly due

   If the original SDLT paid was higher than the correct figure, the difference is the potential overpayment. In principle, yes, the reclaim should reflect the difference between what was actually paid and what should properly have been paid, assuming the legal analysis is sound and the claim is in time.

4. Support the position with evidence

   HMRC will usually expect contemporaneous evidence. That may include the sale contract, transfer, completion statement, survey material, photographs, builder reports, mortgage valuation evidence, and any other documents showing the property’s true condition on the effective date. Later repair invoices can help explain the condition, but they do not replace evidence of the position at completion.

In a case where one calculation produced SDLT of £46,300 and the amount actually paid was £48,800, the practical answer is that the actual filed and paid amount must be checked first. If £48,800 was indeed paid and the correct liability was lower, the potential reclaim would normally be measured against the amount actually overpaid.

Likewise, if the alternative non-residential calculation came to £26,250, the possible repayment would depend on whether that non-residential treatment is legally correct on the facts. It is not enough that a lower figure can be produced by a calculator. The underlying legal basis must be sustainable.

Outcome

The practical conclusion is this:

• the amount potentially reclaimable is based on the SDLT actually paid, not just on a later estimate;
• if the original SDLT was overpaid, the difference may in principle be reclaimable;
• the key issue is whether the property was correctly classified for SDLT purposes on the effective date; and
• for uninhabitable or not suitable for use arguments, the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

Practical Steps

If you are assessing a possible SDLT reclaim of this kind, gather and review the following:

• the SDLT5 certificate;
• the SDLT return details, if available;
• the solicitor’s completion statement showing the tax paid;
• the TR1 transfer;
• the contract for sale;
• any survey, valuation, or lender report;
• dated photographs showing the condition at or before completion;
• quotes, invoices, or reports for works needed immediately after purchase; and
• any correspondence describing the property’s state at the time of purchase.

Then ask the following questions:

1. What amount of SDLT was actually paid to HMRC?
2. Was the original return filed on a residential basis, and did it include the higher rates for additional dwellings?
3. On the effective date, was the property truly suitable for use as a dwelling?
4. Is there strong contemporaneous evidence, not just later opinion?
5. Is the claim still within the relevant time limit for amendment or repayment procedures?

If there is a fee arrangement with an adviser, check the written terms carefully so you understand whether the fee is the only charge, when it becomes payable, and what happens if HMRC later revisits the repayment.

Conclusion

A buyer may be able to reclaim SDLT if the property was wrongly taxed as residential and the correct treatment was non-residential. But the claim must be based on the SDLT actually paid and supported by proper evidence. Where the argument is that the property was not suitable for use as a dwelling, the legal threshold is now significantly harder to meet after Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

Legal References Used

• Finance Act 2003, Part 4
• Finance Act 2003, provisions defining residential property for SDLT purposes
• Finance Act 2003, provisions governing SDLT repayment and amendment procedure
• 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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