“60. I agree with the appellant that Parliament did intend a cut off point for assessments. There is always the possibility of error in calculations and no reason why the making of such errors would lead to an indefinitely extended time limit for the making of an assessment. So, I think the 12 month starts to run from when the tax is first ascertained, even if that first ascertainment contains an error. 61. I am fortified in that view by consideration of §16(6) ….. The drafter of 16(6) was clearly under the impression that an error in the assessment did not start time running again; on the contrary, sub-paragraph (6) is stated expressly to be subject to sub-paragraph (4), which contains the time limit. So, a further assessment to supplement an assessment made on an underestimate of the duty could only be made within the original time limit. 62. In conclusion a re-ascertainment of the duty does not re-start the clock.”
“(1) Liability to a penalty under any of paragraphs 1, 2, 3(1) and 4 does not arise in relation to an act or failure which is not deliberate if P satisfies HMRC (or on appeal the Tribunal) that there is a reasonable excuse for the act or failure.”
“(1) First establish what facts the taxpayer asserts give rise to a reasonable excuse (this may include the belief, acts or omissions of the taxpayer or any other person, the taxpayer’s own experience or relevant attributes, the situation of the taxpayer at any relevant time and any other relevant external facts). (2) Second, decide which of those facts are proven. (3) Third, decide whether viewed objectively those proven facts do indeed amount to an objectively reasonable excuse for the default and the time when that objectively reasonable excuse ceased. In doing so it should take into account the experience and other relevant attributes of the taxpayer and the situation in which the taxpayer found himself at the relevant time or times. It might assist the FTT in this context to ask itself the question “Was what the taxpayer did (or omitted to do or believed) objectively reasonable for this taxpayer in those circumstances?”
“101. I appreciate that care must be taken in deriving principles based on cases dealing with different legislation. However, I can see nothing in Schedule 55 which evidences any intention that the phrase “special circumstances” should be given a narrow meaning. 102. It is clear that in enacting Paragraph 16 of Schedule 55 Parliament intended to give HMRC and, if HMRC’s decision is flawed, the Tribunal a wide discretion to reduce a penalty where there are circumstances which in their view make it right to do so. The only restriction is that the circumstances must be “special”
“(a) is “unprompted” if made at a time when the person making it has no reason to believe that HMRC have discovered or are about to discover the relevant act or failure, and (b) otherwise, it is prompted.”