“(1) P is liable to a penalty under this paragraph if (and only if)– (a) P's failure continues after the end of the period of 3 months beginning with the penalty date, (b) HMRC decide that such a penalty should be payable, and (c) HMRC give notice to P specifying the date from which the penalty is payable.”
“(1) Liability to a penalty under any paragraph of this Schedule does not arise in relation to a failure to make a return if P satisfies HMRC or (on appeal) the First-tier Tribunal or Upper Tribunal that there is a reasonable excuse for the failure. (2) For the purposes of sub-paragraph (1)— (a) an insufficiency of funds is not a reasonable excuse, unless attributable to events outside P's control, (b) where P relies on any other person to do anything, that is not a reasonable excuse unless P took reasonable care to avoid the failure, and (c) where P had a reasonable excuse for the failure but the excuse has ceased, P is to be treated as having continued to have the excuse if the failure is remedied without unreasonable delay after the excuse ceased.”
“Before any question of reasonable excuse comes into play, it is important to remember that the initial burden lies on HMRC to establish that events have occurred as a result of which a penalty is, prima facie, due. A mere assertion of the occurrence of the relevant events in a statement of case is not sufficient. Evidence is required and unless sufficient evidence is provided to prove the relevant facts on a balance of probabilities, the penalty must be cancelled without any question of “reasonable excuse” becoming relevant.”
“An assessment or determination, warrant or other proceeding which purports to be made in pursuance of any provision of the Taxes Acts shall not be quashed, or deemed to be void or voidable, for want of form, or be affected by reason of a mistake, defect or omission therein, if the same is in substance and effect in conformity with or according to the intent and meaning of the Taxes Acts, and if the person or property charged or intended to be charged or affected thereby is designated therein according to common intent and understanding.”
"The test of whether or not there is a reasonable excuse is an objective one. In my judgment it is an objective test in this sense. One must ask oneself: was what the taxpayer did a reasonable thing for a responsible trader conscious of and intending to comply with his obligations regarding tax, but having the experience and other relevant attributes of the taxpayer and placed in the situation that the taxpayer found himself at the relevant time, a reasonable thing to do?"