“where P relies on any other person to do anything, that is not reasonable excuse unless P took reasonable care to avoid the failure, and”
“17…The obligation to make the tax return on time is nonetheless the taxpayer’s. It remains his obligation regardless of the fact that he may have delegated the task of making the return to his agent. There may be circumstances in which the taxpayer’s failure, through his agent, to comply with, e.g. the obligation to make the return on time can amount to a ‘reasonable excuse’. To be such a circumstance it must be something outside the control of the taxpayer and his agent or something that could not reasonably have been foreseen. It must be something exceptional. 18. Here there is no explanation for the defaults save that the previous agents never did what they had been engaged to do. Even if that is right as a matter of fact in the present case (and, as noted, the previous agents dispute the circumstances alleged by the appellants), it does not in my opinion amount to a reasonable excuse. There was no other underlying cause suggested for the failure to make the return on time. Quite simply, the appellants relied upon what they now regard as a firm of unreliable accountants…”