Can you get a refund of higher SDLT if your claim was made late?

Introduction

Many people ask whether they can still recover the higher rates of Stamp Duty Land Tax (SDLT) if they sold their previous home but missed the normal deadline for claiming a refund. This issue often arises where the buyer paid the higher rates on a replacement home purchase and later sold the old dwelling, but the refund claim or amendment was submitted late.

The answer depends on which deadline was missed and whether HMRC has any discretion to extend it. In some cases, exceptional circumstances may help. In others, the legislation is much stricter.

The Question

A homeowner paid the higher rates of SDLT on the purchase of a new main residence. They later sold their previous home and became entitled, in principle, to claim a refund of the additional SDLT. However, the claim was submitted slightly late. The question is whether HMRC can still allow the refund, particularly where the delay may have been connected to serious mental health difficulties affecting the person’s ability to deal with their affairs.

Nick’s Explanation

Nick’s view was that the legislation does contain a limited power for HMRC to allow a longer period in some cases, but that power is tied to the timing of the sale of the old dwelling rather than to a late amendment of a land transaction return.

In anonymised form, his explanation was that the Finance Act 2003 provides that the normal refund window is:

“the period of 3 years beginning with the effective date of the later return, or such longer period as HMRC may allow where they are satisfied that the sale of the old dwelling was prevented by exceptional circumstances beyond the control of the purchaser.”

He also noted that there does not appear to be a matching statutory provision that specifically allows exceptional circumstances to excuse a self-assessment amendment made outside the usual 12-month amendment deadline.

Nick further explained that if the taxpayer can show they were genuinely unable to manage their affairs, or unable to arrange for someone else to do so, because of poor mental health, HMRC may still take that into account when considering the case. But he also cautioned that the prospects of success are likely to be limited and that strong medical evidence would be needed.

The Law

The higher rates of SDLT for additional dwellings are contained in Schedule 4ZA to the Finance Act 2003.

Where a buyer purchases a new main residence before selling their previous one, the higher rates may apply at the time of purchase. If the previous main residence is then sold within the permitted period, the buyer may be entitled to a refund of the additional SDLT.

The key rule is in Schedule 4ZA, paragraph 3. The legislation allows a refund where the old main residence is disposed of within the permitted period. The text referred to in the explanation states:

“the permitted period” means:

• the period of 3 years beginning with the effective date of the later transaction, or
• such longer period as the Commissioners for Her Majesty’s Revenue and Customs may allow where they are satisfied that the sale of the old dwelling was prevented by exceptional circumstances beyond the control of the purchaser.

That extension power is important, but it is aimed at cases where exceptional circumstances delayed the sale of the previous home.

Separate from that, SDLT operates through a self-assessment system. Amendments to a land transaction return are generally subject to a strict statutory time limit. In broad terms, a taxpayer can amend a return within 12 months of the filing date. Once that period has passed, the position becomes much harder, because there is no general free-standing discretion for HMRC to accept a late amendment simply because the circumstances are sympathetic.

Depending on the procedural history, a taxpayer may also need to consider whether the matter can be framed as an overpayment relief claim or whether any other statutory route is available. But where the issue is specifically a late amendment, the legislation is usually restrictive.

Analysis

The first step is to identify exactly what was late.

If the old dwelling was sold outside the normal 3-year period, the taxpayer may be able to argue for extra time under Schedule 4ZA if exceptional circumstances beyond their control prevented the sale. That is a statutory discretion expressly given to HMRC.

If, however, the old dwelling was sold in time but the refund claim or amendment was made late, that is a different problem. The statutory extension for exceptional circumstances does not clearly extend to a late self-assessment amendment. That is why this distinction matters.

The second step is to check the procedural route actually used. Some refund claims are made by amending the SDLT return. Others may involve a separate repayment process. The legal position can differ depending on the route taken and the timing.

The third step is to consider whether HMRC might nevertheless accept representations based on incapacity or serious mental health difficulties. While there may be no clear statutory provision extending the amendment deadline for that reason, HMRC may still consider evidence showing that the taxpayer could not reasonably manage their tax affairs or appoint someone else to do so. This is especially relevant if the delay was directly caused by a serious health condition.

That said, this is not a strong statutory route. It is more an argument for HMRC to exercise any available administrative judgment or to review whether the case falls within another procedural mechanism. The success of that kind of argument will depend heavily on evidence.

The fourth step is evidence. If mental health is relied on, the taxpayer would usually need clear supporting material from a GP, consultant, or other appropriate medical professional. The evidence should explain the nature of the condition, the relevant period, and how it affected the person’s ability to deal with paperwork, deadlines, decision-making, or delegation.

The fifth step is to keep expectations realistic. A sympathetic explanation on its own is unlikely to be enough. HMRC is more likely to engage where the evidence is detailed, consistent, and directly linked to the period of delay.

It is also worth noting, more generally, that where a taxpayer argues that a dwelling was uninhabitable or not suitable for use, the legal threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. That case does not directly answer the late-claim issue discussed here, but it is relevant if the wider SDLT position depends on the condition of the property.

Outcome

If the problem is that the sale of the old home happened outside the normal 3-year period, there may be a statutory argument for extra time if exceptional circumstances prevented the sale.

If the problem is that the sale happened in time but the refund claim or amendment was submitted after the relevant filing or amendment deadline, the position is much weaker. There is no obvious statutory rule giving HMRC a broad discretion to accept a late amendment on exceptional-circumstances grounds.

Where serious mental health difficulties caused the delay, HMRC may still be asked to consider the matter, but the chances of success are likely to be modest unless the evidence is strong and the procedural route is carefully analysed.

Practical Steps

1. Identify the exact purchase date of the new dwelling and the sale date of the old dwelling.
2. Confirm whether the old dwelling was sold within the normal 3-year period.
3. Check whether the refund was claimed by amending the SDLT return or by another formal repayment route.
4. Work out the precise statutory deadline that was missed, including the filing date and amendment deadline.
5. Gather all HMRC correspondence, including any refusal letter and any explanation HMRC has already given.
6. If mental health affected the delay, obtain medical evidence covering the relevant period and explaining the practical impact on the ability to manage affairs or delegate responsibility.
7. Review whether any alternative statutory remedy may still be available, depending on the facts and timing.
8. If HMRC has already refused the claim, consider whether there is a right of review or appeal and whether the refusal can properly be challenged.

Conclusion

A late refund claim for higher SDLT is difficult to rescue. The law does allow HMRC to extend time where exceptional circumstances prevented the sale of the old dwelling, but that does not clearly solve the separate problem of a late self-assessment amendment. If serious mental health issues caused the delay, the point is still worth raising, but success will usually depend on strong evidence and careful analysis of the exact statutory route.

Legal References Used

• Finance Act 2003
• Finance Act 2003, Schedule 4ZA
• Finance Act 2003, Schedule 4ZA, paragraph 3
• 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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