Overpayment Relief Exclusions: Mistakes in Claims or Elections Not Eligible

When SDLT overpayment relief is blocked by mistakes about claims or elections

HMRC’s view is that overpayment relief for Stamp Duty Land Tax is usually not available if too much tax was paid because a formal claim, relief or election was made wrongly, or was not made at all. In those cases, the issue is not treated as a simple overpayment error, and the taxpayer may need to consider whether a late claim or election can be accepted instead.

• Overpayment relief is meant to recover tax that was not due, but it does not cover every case where too much SDLT has been paid.
• The exclusion applies where the overpayment was caused by a mistake in making a formal claim or election, or by failing to make one.
• This can include claiming a relief incorrectly, making an election in the wrong form, omitting a claim entirely, or later regretting a decision not to claim.
• The key question is what caused the overpayment: a normal factual or calculation error, or the absence or defect of a required formal step.
• If the tax saving depended on a valid claim or election, the possible remedy may be under the rules for late claims or elections rather than overpayment relief.

Scroll down for the full analysis.

When overpayment relief is blocked because the mistake was about a claim, relief or election

This page explains a narrow but important limit on overpayment relief for Stamp Duty Land Tax. If too much tax was paid because of a mistake about making a formal claim or election, or because no claim or election was made at all, HMRC’s position is that overpayment relief is not available. This matters because a taxpayer may have paid too much tax but still be unable to recover it through the overpayment relief route.

What this rule is about

Overpayment relief is a mechanism for recovering tax that was not actually due. But it does not apply in every case where too much tax has been paid.

The source material deals with one of the exclusions. It applies where the excessive amount arose because of a mistake connected with a formal claim, a relief, or an election. In other words, the problem is not simply that the tax calculation was wrong. The problem is that a claim or election was made incorrectly, or was not made when it should have been.

In tax law, a claim or election is often the formal step that gives effect to a tax treatment. If that step is not taken properly, the tax result may be unfavourable. This exclusion says that overpayment relief cannot usually be used later to undo that problem.

What the official source says

The HMRC manual says overpayment relief is not due where the amount paid, or due, is excessive because of a mistake:

• in any other formal claim or election, or
• in making any other claim or election, or failing to do so.

The manual also says HMRC may, in limited circumstances, accept a late claim or election. It refers readers to HMRC’s Assessment Claims Manual at SACM10035 for that point.

The important distinction is that the taxpayer may have a possible route through the rules on late claims or elections, but not through overpayment relief itself.

What this means in practice

If too much SDLT was paid because a required claim or election was mishandled, the first question is not “Can overpayment relief fix this?” The first question is “Was the overpayment caused by a mistake about a claim or election?”

If the answer is yes, this exclusion may block overpayment relief.

This can happen in several ways:

• a claim for a relief was completed wrongly
• an election was made in the wrong form or on the wrong basis
• a claim or election was omitted altogether
• the taxpayer chose not to make a claim or election and later realised that this led to more tax being paid

The practical effect is that overpayment relief is not a general safety net for missed procedural steps. Where the tax result depends on making a valid claim or election, the law may treat that as a separate issue from simply overpaying tax.

That does not necessarily mean there is no remedy. The manual expressly notes that HMRC may sometimes accept a late claim or election. But that is a different question, governed by different rules.

How to analyse it

A sensible way to approach this issue is to work through the following questions.

• What exactly caused the overpayment? Was it a straightforward computational or factual error, or was it the absence or defect of a formal claim or election?
• Was there a specific statutory relief or election that needed to be claimed?
• Did the taxpayer make that claim or election, make it incorrectly, or fail to make it at all?
• Is the taxpayer now trying to use overpayment relief to achieve the result that a valid claim or election would have produced?
• Are there separate rules that allow a late claim or election to be accepted?

This distinction matters because not every overpayment is treated the same way. If the overpayment flows from the legal effect of not making a required claim or election, HMRC’s published view is that overpayment relief is excluded.

So the analysis usually turns on identifying the legal mechanism that would have reduced the tax. If that mechanism was a formal claim or election, this exclusion is likely to be relevant.

Example

This is an illustration only.

A taxpayer files an SDLT return and pays tax without making a formal claim that would have reduced the liability. Later, the taxpayer realises that if the claim had been made, less tax would have been due. The taxpayer then asks for overpayment relief on the basis that too much SDLT was paid.

On the HMRC manual’s approach, overpayment relief is likely to be unavailable if the overpayment arose because the formal claim was not made. The real issue is the failure to make the claim, not an ordinary overpayment error. The correct question would be whether the relevant rules allow a late claim to be made or accepted.

Why this can be difficult in practice

The difficult part is often identifying whether the mistake is truly about a claim or election, or whether it is really a different kind of error.

Some tax outcomes happen automatically if the facts are right. Others only apply if the taxpayer takes a formal step. The source material is concerned with the second category.

In practice, there can be room for argument about how to characterise what went wrong. For example:

• Was the taxpayer mistaken about the underlying facts, or about the need to make a formal election?
• Was there an invalid claim, or no claim at all?
• Did the legislation make the tax treatment automatic, or conditional on a formal procedural step?

The manual does not resolve every borderline case. It states HMRC’s position on the exclusion, but the precise result in any case will depend on the statutory framework for the relief or election in question.

Key takeaways

• Overpayment relief is not available where too much tax was paid because of a mistake in making, or failing to make, a formal claim or election.
• If the tax saving depended on a formal relief claim or election, the issue is usually whether a late claim or election can be accepted, not whether overpayment relief applies.
• The critical practical question is what actually caused the overpayment: an ordinary error, or a problem with a required claim or election.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Overpayment Relief Exclusions: Mistakes in Claims or Elections Not Eligible

View all HMRC SDLT Guidance Pages Here