“… provides that a person may make a claim for repayment of an amount they have overpaid by way of income tax or CGT or discharge of an amount that has been over-assessed, subject to restrictions. It also provides that the Commissioners for HM Revenue and Customs (HMRC) are not liable to give relief except under this provision or any other provision relating to income tax or CGT.”
“27. Error or mistake relief is intended to provide a final opportunity for taxpayers to reclaim overpaid tax. 28. However, the current rules only apply to tax overpaid on assessments as a result of a relevant mistake in a return. The claim must be made within time limits. On receiving a claim, HMRC determine what amount is just and reasonable to repay and may take into account any liabilities that have not been assessed. 29. Claims under the new rules will apply to all overpayments of tax, ensuring there is a single route to obtain redress and that, as far as possible, disputes are dealt with through the tribunal. [emphasis added] 30. A claim will be possible only if no other statutory steps are available to recover an overpayment when a person first becomes aware, or might reasonably be expected to be aware, that they have overpaid. 31. The person must also have used any appeal rights that were available and the claim will have to be made within time limits.”
“33. If the two remedies cover precisely the same ground and are inconsistent with each other, then the common law remedy will almost certainly have been excluded by necessary implication. To do otherwise would circumvent the intention of Parliament. … … 34. The question is not whether there are any differences between the common law remedy and the statutory scheme. There may well be differences. The question is whether the differences are so substantial that they demonstrate that Parliament could not have intended the common law remedy to survive the introduction of the statutory scheme. The court should not be too ready to find that a common law remedy has been displaced by a statutory one, not least because it is always open to Parliament to make the position clear by stating explicitly whether the statute is intended to be exhaustive. The mere fact that there are some differences between the common law and the statutory positions is unlikely to be sufficient unless they are substantial. … The question is whether, looked at as a whole, a common law remedy would be incompatible with the statutory scheme and therefore could not have been intended by [sic] coexist with it.”
“But the question is in the end one of construction. When a special or qualified statutory remedy is provided, it may well be inferred that Parliament intended to exclude any common law remedy which would or might have arisen on the same facts … But I see no reason to infer that Parliament intended to exclude a common law remedy in all cases of mistake … in which the revenue was unjustly enriched but did not fall within section 33.”
“[Section 33] confers a right subject to highly restrictive conditions to invoke what is essentially a discretionary power of the commissioners to grant a refund of overpaid tax. No one suggests on this appeal that such a limited remedy could possibly be enough in itself to satisfy the virtually unqualified obligation of the United Kingdom to provide an effective means of recovering tax overcharged contrary to EU law. … However, it is axiomatic that the courts cannot imply an exclusion of unrestricted rights of action at common law where that would be inconsistent with an overriding rule of EU law that an unrestricted right must be available. Section 33 cannot therefore be an exclusive right to recover tax overcharged contrary to EU law. Whether it is an exclusive right in other circumstances, is not a point which needs to be considered on this appeal.”