(1) The Principal Act is amended in the manner and to the extent specified in Schedule 1.

(2)

(a) Paragraph 1 and subparagraph (f) of paragraph 4 of Schedule 1 shall apply for the year of assessment 2018 and each subsequent year of assessment in respect of emoluments paid on or after 1 January 2018.

(b) Paragraph 2 of Schedule 1 shall apply for the year of assessment 2019 and each subsequent year of assessment in respect of emoluments paid on or after 1 January 2019.

(c) Paragraph 3 of Schedule 1 shall apply for the year of assessment 2019 and each subsequent year of assessment in respect of an assessment of tax made under section 990 of the Principal Act in respect of an income tax month commencing on 1 January 2019 and each subsequent income tax month.

(d) Paragraph 4 of Schedule 1, other than subparagraphs (f), (m) and (o), shall apply for the income tax month commencing 1 January 2019 and each subsequent income tax month in respect of emoluments paid on or after 1 January 2019.