“(1) this section applies in relation to any income tax…which has become payable by any person in accordance with section 55 or 59Bof this Act [the tax in question became payable in accordance with section 59B of the Act]. (2) Where any of the tax remains unpaid on the day following the expiry of 28 days from the due date, the taxpayer shall be liable to a surcharge equal to 5 per cent of the unpaid tax. (3)Where any of the tax remains unpaid on the day following the expiry of 6 months from the due date, the taxpayer shall be liable to a further surcharge equal to 5 per cent of the unpaid tax… …(5) An officer of the Board may impose a surcharge under subsection (2) or (3) above… …(7) an appeal may be brought against the imposition of a surcharge under subsection (2) or (3) above within the period of 30 days… (8) Subject to subsection (9) below, the provisions of this Act relation to appeals shall have effect in relation to an appeal under subsection (7) above as they have effect in relation to an appeal against an assessment to tax. (9) On an appeal under subsection (7) above that is notified to the tribunal, section 50(6) to (8) of this Act [which permit the tribunal to increase or reduce the assessment according to the evidence before it] shall not apply but the tribunal may- (a) if it appears that, throughout the period of default, the taxpayer had a reasonable excuse for not paying the tax, set aside the imposition of the surcharge; or (b)if it does not so appear, confirm the imposition of the surcharge. (10) Inability to pay the tax shall not be regarded as a reasonable excuse for the purposes of subsection (9) above. (11) The Board may in their discretion- (a) mitigate any surcharge under subsection (2) or (3) above, or (b) stay or compound any proceedings for the recovery of such a surcharge and may also, after judgement further mitigate or entirely remit the surcharge.”
“…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 ceased.”