(1) Subject to the provisions of this section, any individual, to whom Chapter 2A of Part 15 applies for any year of assessment, who has made a payment which includes a relevant amount in respect of that year of assessment shall, without prejudice to the payment so made, be treated as having made a payment on account of income tax of an amount equal to the relevant amount.
(2) So much of a payment of tax (referred to in this section as the ‘deemed payment on account of tax') for a year of assessment by an individual as is treated in accordance with subsection (1) shall, in so far as possible, be set against any liability to income tax of the individual, for the year of assessment following the first-mentioned year of assessment.
(3) To the extent that the deemed payment on account of tax has not been set off in accordance with subsection (2), the balance remaining shall be set off against a liability to income tax for any subsequent year of assessment of the individual who is treated
…