“For the purposes of this Act … where a person had a reasonable excuse for not doing anything required to be done he shall be deemed not to have failed to do it unless the excuse ceased and, after the excuse ceased, he shall be deemed not to have failed to do it if he did it without unreasonable delay after the excuse had ceased”
“(1) This section applies in a case where— (a) notice of appeal may be given to HMRC, but (b) no notice is given before the relevant time limit. (2) Notice may be given after the relevant time limit if— (a) HMRC agree, or (b) where HMRC do not agree, the tribunal gives permission. (3) If the following conditions are met, HMRC shall agree to notice being given after the relevant time limit. (4) Condition A is that the appellant has made a request in writing to HMRC to agree to the notice being given. (5) Condition B is that HMRC are satisfied that there was reasonable excuse for not giving the notice before the relevant time limit. (6) Condition C is that HMRC are satisfied that request under subsection (4) was made without unreasonable delay after the reasonable excuse ceased. (7) If a request of the kind referred to in subsection (4) is made, HMRC must notify the appellant whether or not HMRC agree to the appellant giving notice of appeal after the relevant time limit. (8) In this section “relevant time limit”, in relation to notice of appeal, means the time before which the notice is to be given (but for this section).”
“[44] When the FTT is considering applications for permission to appeal out of time, therefore, it must be remembered that the starting point is that permission should not be granted unless the FTT is satisfied on balance that it should be. In considering that question, we consider the FTT can usefully follow the three-stage process set out in Denton: (1) Establish the length of the delay. If it was very short (which would, in the absence of unusual circumstances, equate to the breach being “neither serious nor significant”), then the FTT “is unlikely to need to spend much time on the second and third stages” – though this should not be taken to mean that applications can be granted for very short delays without even moving on to a consideration of those stages. (2) The reason (or reasons) why the default occurred should be established. (3) The FTT can then move onto its evaluation of “all the circumstances of the case”