Section 961 of the Principal Act is hereby amended, as on and from the 6th day of April, 1999, by the substitution of the following subsection for subsection (2):
"(2) On payment of income tax, the Collector-General shall furnish the person concerned with a receipt in respect of that payment; such a receipt shall consist of whichever of the following the Collector-General considers appropriate, namely -
(a) a separate receipt on the prescribed form in respect of each such payment, or
(b) a receipt on the prescribed form in respect of all such payments that have been made within a period specified in the receipt.".