“In the case of a relevant obligation relating to income tax … the potential lost revenue is so much of any income tax … to which P is liable in respect of the tax year as by reason of the failure is unpaid on 31 January following the tax year.”
“16(1) Where P becomes liable for a penalty under any of the paragraphs 1 to 4 HMRC shall —
“63. … A statute is designed to be workable, and the interpretation thereof by a Court should be to secure that object, unless crucial omission or clear direction makes that end unattainable. Now, there are three stages in the imposition of a tax: there is the declaration of liability, that is the part of the statute which determines what persons in respect of what property are liable. Next, there is the assessment. Liability does not depend on assessment. That, ex hypothesi, has already been fixed. But assessment particularises the exact sum which a person liable has to pay. Lastly, come the methods of recovery, if the person taxed does not voluntarily pay …”.
“In the present case, it is argued that the Appellant was unaware of her obligation under tax law to return the additional payments and to pay tax on those additional payments. In effect this is a plea of ignorance of the law … The Tribunal considers that a prudent and reasonable taxpayer must at the very least be expected to take prudent and reasonable steps to ascertain what are his or her tax obligations”.
“… as a matter of policy such ignorance [of the law] cannot amount to a reasonable excuse. Ignorance of the law cannot be a reasonable excuse as that would result in the law favouring persons who choose to remain in ignorance of the law over those who sought to know the law in order to obey it.”