Overpayment Relief Exclusions: Detailed Cases and Conditions Explained

When SDLT overpayment relief is blocked

SDLT overpayment relief is a limited fallback remedy, not a general way to reopen old tax positions. Even if too much SDLT seems to have been paid, a claim can still be refused if one of the statutory exclusions applies, especially where another route was available, the issue has already been dealt with, or the claim depends on matters the law excludes.

• The legislation sets out seven exclusions, known as Cases A to G, which can block an SDLT overpayment relief claim.
• Relief may be unavailable if the issue could have been corrected by amending the return, making a proper statutory claim, or appealing earlier.
• A claim can also be barred if it relates to a mistake about a claim or election, or if the taxpayer knew, or should reasonably have known, the point in time to raise it before.
• Overpayment relief cannot usually be used to revisit matters already decided by a court or tribunal, settled with HMRC on appeal, or pursued after HMRC has started enforcement action.
• Case G may prevent relief where the tax was calculated in line with the generally prevailing practice at the time, even if that practice is later shown to be wrong.
• In practice, the outcome often depends on the procedural history, the timing, and what the taxpayer knew or ought to have known.

Scroll down for the full analysis.

When SDLT overpayment relief is blocked: the statutory exclusions

This page explains when a claim for SDLT overpayment relief is not available, even if too much tax appears to have been paid. The legislation contains a series of exclusions, described as Cases A to G. These rules matter because overpayment relief is a fallback remedy, not a way to reopen every past SDLT position.

What this rule is about

Overpayment relief is a mechanism for recovering SDLT that was not actually due. But it is subject to strict limits. The exclusions are designed to stop overpayment relief being used where another route should have been used, where the point has already been dealt with, or where the claim depends on matters the legislation excludes.

In practice, this means that a person cannot assume that an overpayment automatically leads to a refund. The first question is not only whether too much SDLT was paid, but also whether one of the statutory exclusions prevents a claim.

What the official source says

The HMRC manual says overpayment relief is unavailable if one of the legislative exclusions applies. It lists seven exclusion cases:

• Case A: the overpayment relief claim arises from a mistake about a claim or election.
• Case B: the overpayment or over-assessment can be corrected by another route.
• Case C: the person could have obtained relief by another means when they first knew, or ought reasonably to have known, that the relief was available.
• Case D: a court or tribunal has already considered the grounds of the claim, or HMRC has considered them and settled the appeal by agreement.
• Case E: the person knew, or ought reasonably to have known, the grounds for the claim at a time when they could have raised them on an appeal to a court or tribunal.
• Case F: HMRC has taken proceedings to enforce payment of the amount claimed.
• Case G: the amount was understood to be due under the practice generally prevailing when the liability was calculated.

The source page is a signpost page. It identifies the exclusions and points to separate material on each one.

What this means in practice

These exclusions show that overpayment relief is not a general correction power. It usually sits behind other parts of the SDLT system, such as amending a return, making a claim in the proper form, or appealing an assessment.

The practical effect of each case can be summarised like this:

• Case A stops overpayment relief being used to undo certain mistakes about making, or not making, a claim or election.
• Case B stops it where there is still another valid way to correct the position.
• Case C stops it where a person missed an earlier route to relief after they knew, or should have known, about it.
• Case D stops the same issue being revisited after litigation or an agreed appeal settlement.
• Case E stops a person holding back a point that could have been raised on appeal and then trying to use overpayment relief later.
• Case F stops overpayment relief where HMRC has already taken enforcement proceedings for the amount.
• Case G protects amounts charged in line with the generally prevailing practice at the time, even if that practice is later shown to be wrong.

Taken together, the cases aim to protect finality, proper use of statutory procedures, and reliance on the law and practice as understood at the relevant time.

How to analyse it

A sensible way to approach an SDLT overpayment relief question is to work through the following points.

1. Identify the alleged overpayment clearly

Work out exactly what amount is said to have been overpaid and why. Is the argument based on a factual mistake, a legal interpretation point, a missed relief, or a later change in understanding?

2. Ask whether another route exists or existed

Consider whether the position could be corrected by amendment, by a specific statutory claim, or by appeal. If so, Case B or Case C may become relevant.

3. Check whether the issue is really about a claim or election

If the alleged overpayment arises from a mistake concerning a claim or election, Case A may prevent overpayment relief. This is important in SDLT because many reliefs and treatment choices depend on formal claims, elections, or procedural steps.

4. Review the procedural history

Has there already been an appeal, tribunal decision, court decision, or agreed settlement with HMRC on the same grounds? If yes, Case D may apply.

5. Consider what the taxpayer knew, or should reasonably have known, and when

Cases C and E both turn on timing and knowledge. The question is not only what the person actually knew, but also what they ought reasonably to have known. That introduces an objective element.

6. Check whether HMRC has taken enforcement proceedings

If HMRC has already taken proceedings to enforce payment of the amount now claimed back, Case F may block relief.

7. Consider the prevailing practice at the time

If the amount was treated as due under the practice generally prevailing when the SDLT position was calculated, Case G may apply. This can matter where the law was uncertain and was later clarified differently.

Example

Illustration: a buyer files an SDLT return and pays tax on a transaction. Later, they argue that a relief should have applied. If that relief could have been claimed through a specific statutory route when they first knew, or should have known, about it, overpayment relief may be excluded under Case C. If they had already appealed the assessment and settled the same point with HMRC, Case D may also prevent a later overpayment relief claim.

The exact outcome would depend on the facts, including the type of relief, the timing, and what procedural opportunities were available.

Why this can be difficult in practice

The exclusions are easy to list but harder to apply. Several of them depend on procedural history and on judgments about what a person knew, or should reasonably have known, at a particular time.

There can also be overlap between the cases. For example, a missed opportunity to claim relief may raise both the question whether another route existed and whether the point could have been raised earlier on appeal.

Case G can be especially sensitive because it refers to the practice generally prevailing at the time the liability was calculated. That may require evidence about how the law was commonly being applied then, not just what is now thought to be the correct legal analysis.

It is also important not to treat HMRC’s manual as the legislation itself. The legal effect comes from the statutory exclusions. The manual helps explain HMRC’s view, but the precise application always depends on the legislation and the facts.

Key takeaways

• Overpayment relief for SDLT is subject to statutory exclusions, labelled Cases A to G.
• A claim can fail even where too much tax appears to have been paid, if the law says another route should have been used or the issue has already been dealt with.
• The critical questions are usually procedural: what happened before, what opportunities existed, and what the taxpayer knew or should have known at the time.

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: Detailed Cases and Conditions Explained

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