Introduction
The Upper Tribunal has provided welcome clarity on the mechanics of SDLT overpayment claims, resolving several practical questions that have plagued practitioners attempting to recover tax paid in error.
The decision offers a roadmap for future claims while highlighting ongoing areas of uncertainty.
The Landscape of SDLT Errors
Stamp Duty Land Tax is a self-assessed tax, which creates an obvious problem: taxpayers frequently get it wrong. Sometimes they overpay, sometimes they underpay. The question is what happens when they realise their mistake.
For underpayments, HMRC has extensive powers to enquire into returns and assess additional tax. For overpayments, the position has historically been murkier, with the statutory framework offering less obvious routes to recovery.
The Finance Act 2003 provides for amendments to returns within twelve months of the filing date, but what about errors discovered later?
Can taxpayers simply request refunds?
Must they go through formal appeal processes?
And what happens when HMRC disagrees about whether an overpayment occurred at all?
The Upper Tribunal’s Clarifications
The recent Upper Tribunal decision addresses several of these questions, building on First-tier Tribunal jurisprudence to establish clearer principles.
On the nature of claims: The Tribunal confirmed that overpayment claims are not the same as appeals against assessments. A taxpayer seeking to recover overpaid SDLT must make a claim under the relevant provisions, not simply file an appeal. This procedural distinction matters because different time limits and processes apply.
On time limits: The Tribunal examined the interaction between the 12-month amendment window, the 4-year claim period under Schedule 11A to the Finance Act 2003, and the broader provisions for error or mistake relief. The analysis confirms that different routes have different limitations, and taxpayers must identify the correct basis for their claim.
On the burden of proof: Importantly, the Tribunal clarified that where a taxpayer claims to have overpaid, the burden is on them to demonstrate both that tax was paid and that it exceeded the amount properly due. This may seem obvious, but in complex transactions the evidential requirements can be challenging.
On HMRC’s duty to repay: Where a valid claim establishes an overpayment, HMRC has no discretion to withhold the refund. This is a straightforward but valuable confirmation… overpaid tax must be returned.
Common Overpayment Scenarios
SDLT overpayments typically arise in several contexts:
Multiple dwellings relief (MDR): Until its abolition for transactions completing from 1 June 2024, MDR was frequently overlooked at completion, particularly in transactions involving annexes or subsidiary dwellings. Claims to recover the difference remain possible for historic transactions.
Mixed-use treatment: Properties with genuine non-residential elements attract lower rates than pure residential purchases. Where the residential rates were incorrectly applied, overpayment claims may succeed, though HMRC now scrutinises these claims intensively.
Linked transaction errors: The linked transaction rules are notoriously complex, and calculation errors are common. Where consideration was incorrectly allocated or the rules misapplied, recovery may be available.
Relief failures: Various SDLT reliefs require claims to be made, and failure to claim at the time does not necessarily preclude later recovery, though the procedural route may be convoluted.
Practical Steps for Claims
Following the Upper Tribunal’s guidance, practitioners should approach overpayment claims systematically:
- Identify the correct basis: Is this an amendment to a return, a formal claim, or an error or mistake application? Each has different requirements.
- Check time limits: Different routes have different limitation periods. Act promptly once an error is identified.
- Assemble evidence: The burden of proof lies with the claimant. Gather completion statements, contracts, and any other documentation supporting the claim that tax was overpaid.
- Consider HMRC’s likely response: Some claim types—particularly mixed-use—attract intensive HMRC scrutiny. Anticipate challenges and prepare responses in advance.
- Document the reasoning: Clear analysis of why the original return was incorrect and why the claimed treatment is correct will assist in avoiding protracted disputes.
Areas of Continuing Uncertainty
While the Upper Tribunal has clarified much, questions remain:
- Discovery assessments and overpayment interactions: What happens when HMRC opens an enquiry or makes a discovery assessment into a return where the taxpayer believes they actually overpaid? Can the taxpayer effectively counter-claim?
- Interest: Overpayment claims should in principle attract repayment interest, but the rates and calculation mechanics are not always straightforward.
- Professional negligence interactions: Where an overpayment resulted from adviser error, the interaction between recovery from HMRC and claims against the adviser requires careful navigation.
Looking Ahead
The Upper Tribunal’s decision is a helpful step toward a more coherent framework for SDLT overpayment claims. As with much of SDLT, however, the regime remains more complex than it should be—a consequence of bolting amendments onto the Finance Act 2003 structure over twenty years without fundamental review.
For taxpayers who believe they overpaid SDLT, the message is clear: claims are possible, but procedure matters. Getting expert advice early, both on the substantive position and the correct procedural route, is essential.
The four-year clock is always ticking.
For assistance with SDLT disputes or overpayment claims, please contact Tax Barrister UK.