Interest on Overpaid Tax Repayments: HMRC Procedures and Further Information

Interest on SDLT Repayments After Overpayment

If too much Stamp Duty Land Tax (SDLT) has been paid and HMRC repays it, interest may also be due. However, this is not automatic in every case, and the detailed rules are set out separately in HMRC guidance on repayment interest, not in the source material itself.

• Overpaid SDLT can arise from a mistake in the return, a later amendment, a successful claim, or an HMRC correction.
• When HMRC repays overpaid SDLT, there may be a separate entitlement to repayment interest.
• The rules for repayment interest are different from the rules on interest charged for SDLT that was underpaid or paid late.
• Any repayment should be checked in two parts: whether the tax has been repaid correctly and whether repayment interest has been considered under the right rules.
• The source material is only a signpost, so the conditions, dates, exclusions, and calculation method for interest must be checked in the specific HMRC repayment-interest guidance.

Scroll down for the full analysis.

Interest on SDLT repayments where too much tax was paid

This page is about a narrow but important procedural point in Stamp Duty Land Tax: when HM Revenue & Customs repays SDLT that was overpaid, interest may also be payable. The source material does not set out the detailed rules itself. Instead, it points to other HMRC material dealing with repayment interest and, separately, interest on tax that was underpaid after the filing date.

What this rule is about

Sometimes a taxpayer pays more SDLT than was actually due. That can happen because of an error in the return, a later amendment, a successful claim, or a correction following HMRC review. When tax is repaid, the next question is whether HMRC must also pay interest for the period during which it held money that should not have been kept.

The source page is simply identifying that there is a legal mechanism for repayment interest. It is not creating a new relief or setting out a broad discretion. The point is procedural: overpaid SDLT may carry interest, but the detailed entitlement depends on the specific repayment-interest rules.

What the official source says

The official material states that there are provisions allowing HMRC to pay interest on repayments of overpaid tax. It then directs the reader to the part of the SDLT manual dealing with repayment interest. It also cross-refers to a separate manual page about interest on tax that was underpaid after the filing date.

In other words, the source confirms two distinct ideas:

• if SDLT has been overpaid and is repaid, interest may be due on that repayment; and
• the rules for repayment interest are different from the rules that apply when too little tax was paid and interest is charged later.

What this means in practice

If you recover overpaid SDLT, do not assume the repayment amount is the whole story. There may also be a separate question about repayment interest.

Equally, do not assume that interest is automatic in every case or that it is calculated in the same way as interest on late-paid tax. The source material signals that these are governed by specific rules elsewhere.

For taxpayers and conveyancers, the practical effect is that a repayment should be checked in two stages:

• Has the SDLT overpayment itself been identified and repaid correctly?
• Has any repayment interest been considered under the correct rules?

This matters particularly where a significant amount of tax was overpaid or where HMRC held the money for a long period.

How to analyse it

A sensible way to approach the issue is:

• Identify why the SDLT was overpaid. Was it a mistake in the original return, a later correction, or a claim accepted after the event?
• Establish when the overpayment arose and when HMRC repaid it.
• Check the specific repayment-interest rules referred to in HMRC’s SDLT manual, rather than assuming general tax-interest principles apply without modification.
• Keep separate the question of repayment interest from any issue about interest charged by HMRC on underpaid tax after the filing date.

The last point is important. The source expressly links to a different page for underpayments. That suggests the reader should not treat repayment interest and underpayment interest as mirror images. They are related topics, but not the same legal question.

Example

Illustration: A buyer files an SDLT return and pays tax on the basis of an incorrect figure. Later, the return is corrected and HMRC accepts that too much tax was paid. HMRC repays the excess SDLT. At that stage, the buyer should also consider whether the repayment carries interest under the repayment-interest provisions referred to in the official material.

The answer is not found on this source page itself. This page only confirms that such provisions exist and that the detailed rules sit elsewhere.

Why this can be difficult in practice

The main difficulty is that the source page is only a signpost. It tells you that repayment interest may be payable, but it does not explain the conditions, start date, end date, exclusions, or calculation method.

Another practical difficulty is that readers often confuse three separate things:

• repayment of overpaid SDLT;
• interest paid by HMRC on that repayment; and
• interest charged by HMRC where SDLT was underpaid or paid late.

Those issues need to be analysed separately. The fact that tax is repaid does not, by itself, answer every question about interest. Likewise, the rules on HMRC charging interest on underpayments do not automatically tell you how repayment interest works.

Key takeaways

• HMRC may pay interest when overpaid SDLT is repaid.
• The detailed entitlement is not set out on this page and must be checked in the specific repayment-interest provisions.
• Repayment interest and interest on SDLT underpaid after the filing date are separate issues and should not be conflated.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Interest on Overpaid Tax Repayments: HMRC Procedures and Further Information

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