‘It is clear that ignorance of the law, or a mistaken understanding of legislation is not accepted in law as an excuse for failure to comply with it. This is on the basis that a taxpayer should be sufficiently acquainted with the law and such knowledge is required to be accurate.’
“[20] ….. (4) any failure on the part of HMRC to issue warnings to defaulting taxpayers, whether in respect of the imposition of penalties or the fact of late payment, is not of itself capable of amounting either to a reasonable excuse or special circumstances.”
“…to be special the event must be something out of the ordinary, something uncommon; …”
“[53.] We were not referred to (and could not find) any authority on the meaning of "special circumstances". Plainly it must mean something different from, and wider than, reasonable excuse, for (i) if its meaning were confined within that of reasonable excuse, paragraph 9 would be otiose, and (ii) because paragraph 9 envisages a reduction in a penalty rather than absolution, it must be capable of encompassing circumstances in which there is some culpability for the default: where it is right that some part of the penalty should be borne by the taxpayer. [54.] The adjective "special” requires simply that the circumstances be peculiar or distinctive. But that does not necessarily mean that the circumstances which affect all or most taxpayers could not be special: an ultra vires assertion by HMRC that for a period penalties would be halved might well be special circumstances; but generally special circumstances will be those confined to particular taxpayers or possibly classes of taxpayers. They must encompass the situation in which it would be significantly unfair to the taxpayer to bear the whole penalty.”
“[20] ….. (3) lack of awareness of the penalty regime is not capable of constituting a special circumstance; in any event, no reasonable employer, aware generally of its responsibilities to make timely payments of PAYE and NICs amounts due, could fail to have seen and taken note of at least some of the information published and provided by HMRC; (4) any failure on the part of HMRC to issue warnings to defaulting taxpayers, whether in respect of the imposition of penalties or the fact of late payment, is not of itself capable of amounting either to a reasonable excuse or special circumstances.”