(1) Section 531 of the Principal Act is amended -

(a) by inserting the following after subsection (3A):

"(3B)

(a) Subject to paragraph (b), where a principal or any person who was previously a principal makes a remittance of tax in respect of a year of assessment or a period comprised in a year of assessment and details of the remittance are not included in a return required to be made under subsection (3A), the amount comprised in the remittance shall be deemed to be a remittance in respect of the first income tax month of the year of assessment.

(b) Where, within 1 month of interest being demanded of a person by the Collector-General under subsection (9) by virtue of the application of paragraph (a), the person makes a return to the Collector-General under subsection (3A) for the income tax month or months to which the remittance of tax relates and of the amount comprised in the remittance for each of those income tax months, paragraph (a) shall be deemed not to have applied and the remittance shall be treated for the purposes of this section as a remittance or, as the case may be, remittances of tax for the respective income tax month or months.",

(b) by substituting the following for paragraph (ii) of subsection (10):