SDLT Higher Rates Refunds, Interest And Calculation Rules
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Can you claim interest on an SDLT higher rates refund, and how is the refund amount worked out?
Introduction
People often search for this issue after buying a new home before selling their previous main residence. In that situation, the higher rates of Stamp Duty Land Tax (SDLT) may have been paid on the purchase. Once the old main residence is sold, the buyer may be entitled to reclaim the extra 3% surcharge.
Two questions commonly arise. First, how is the refund figure actually calculated? Second, does HMRC add interest to the refund if there has been a delay? These points can become confusing, especially where earlier figures or labels were used incorrectly.
The Question
A buyer had paid £50,700 in SDLT when purchasing a replacement home. Later, after becoming eligible to reclaim the higher rates surcharge, the buyer wanted to understand why different figures had appeared in correspondence, including an incorrect reference to non-residential rates.
The buyer also wanted to know whether HMRC must pay interest on top of the refund, particularly where there had been delays and mixed messages during the reclaim process.
Nick’s Explanation
Nick’s explanation was that the correct starting point was the completion statement. On those figures:
- Higher rate SDLT originally paid: £50,700
- Standard residential SDLT actually due: £27,000
- Total reclaim: £23,700
He explained that the earlier reference to non-residential SDLT was simply wrong and should be ignored.
In anonymised form, his key point was:
The mention of non-residential SDLT was incorrect and can be ignored. The correct calculation is the SDLT paid at the higher rates minus the standard residential SDLT that should remain payable.
On interest, Nick’s position was clear:
There is no statutory interest payable on refunds of the higher rates surcharge under Schedule 4ZA of the Finance Act 2003, because the surcharge was correctly due at the time of purchase and the right to a refund only arises once the previous main residence has been sold.
He also said that, once a valid reclaim is submitted, HMRC commonly takes around 4 to 8 weeks to process it, although longer delays can happen if HMRC reviews the claim more closely.
The Law
The higher rates of SDLT for additional dwellings are governed by Schedule 4ZA to the Finance Act 2003. Broadly, where a person buys a new dwelling before disposing of their previous main residence, the higher rates may apply at the time of purchase.
If the buyer later sells the previous main residence and the statutory conditions are met, they may reclaim the additional amount that arose from the higher rates charge.
The important legal point is this: the higher rates charge is not treated as wrongly collected at the outset if the conditions for the surcharge were met on the purchase date. Instead, the law creates a later right to a refund once the previous main residence is disposed of and the other requirements are satisfied.
That distinction matters for interest. Because the tax was lawfully charged when paid, a refund under Schedule 4ZA is generally a repayment of a surcharge that later becomes reclaimable, not a repayment of tax that was unlawfully demanded from the start.
On a separate point, where a taxpayer argues that a property was not suitable for use as a dwelling at the effective date of transaction, the current legal threshold is relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. Serious disrepair or inconvenience is not always enough. The condition must be such that the property falls outside the statutory concept of a dwelling for SDLT purposes.
Analysis
The figures can be broken down step by step.
The buyer paid SDLT of £50,700 on completion. That was the total SDLT charged using the higher rates.
The standard residential SDLT that should remain payable, once the reclaim conditions are met, is £27,000.
The difference between those two figures is the reclaim amount:
£50,700 – £27,000 = £23,700
That is why the refund is £23,700. It represents the additional SDLT paid because the higher rates applied at the time of purchase.
If another figure such as £29,000 appeared under a heading such as non-residential SDLT, that does not alter the legal analysis if that heading was simply a mistake. In a straightforward higher-rates reclaim for a replacement main residence, the proper comparison is usually:
- SDLT actually paid at higher rates, and
- SDLT that would have been payable at ordinary residential rates.
On interest, the buyer’s frustration is understandable, especially if different informal comments were received. But the legal position is still the key point. If the surcharge was correctly payable on the purchase date, and the refund only becomes available later because the previous main residence is then sold, HMRC is not generally paying back money that was unlawfully held from day one. It is paying a refund that the statute later allows.
That is why Nick said there is no statutory entitlement to an extra 3.5% or other interest on top of the reclaim under Schedule 4ZA.
As for timing, once the reclaim is properly submitted with the required information, HMRC often processes it within 4 to 8 weeks. That is an administrative timeframe rather than a statutory guarantee. Some claims take longer.
Outcome
The practical answer is:
- The correct SDLT reclaim figure is £23,700 if £50,700 was paid and £27,000 was the standard residential SDLT due.
- An earlier reference to non-residential SDLT can be disregarded if it was an error.
- HMRC does not generally pay statutory interest on a higher rates refund claimed under Schedule 4ZA of the Finance Act 2003.
- Once submitted, the reclaim may often be processed in around 4 to 8 weeks, although delays can occur.
Practical Steps
If you are checking your own position, these are the sensible next steps:
Locate the completion statement and confirm the SDLT actually paid on purchase.
Work out the standard residential SDLT that would have applied without the higher rates surcharge.
Subtract the standard residential figure from the higher rates figure to identify the reclaim amount.
Check that the statutory conditions for a replacement of a main residence are satisfied, including the disposal of the previous main residence within the relevant time limit.
Make sure the reclaim is submitted with accurate supporting information and correct bank details for repayment.
Do not assume that HMRC will add interest to the refund unless there is a clear legal basis for it.
If your case involves an argument that the property was uninhabitable or not suitable for use as a dwelling, assess that point carefully. The threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.
Conclusion
Where a buyer paid higher rates SDLT and later qualifies for a replacement main residence refund, the reclaim is normally the difference between the higher rates SDLT paid and the standard residential SDLT that should remain due. On the figures discussed here, that is £23,700. In general, HMRC does not add statutory interest to that type of refund under Schedule 4ZA.
Legal References Used
- Finance Act 2003
- Schedule 4ZA, Finance Act 2003
- 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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