(1) In this section -
'accountable person' means a bank or building society within the meaning of section 123B;
'base period', in relation to a due date, means the year ending immediately before the due date in respect of which a statement is required to be delivered to the Commissioners under section 123B;
'chargeable period', in relation to a due date, means the year ending immediately after the due date in respect of which a statement is required to be delivered to the Commissioners under section 123B;
'due date' means -
(a) in respect of the year 2008, 15 December in that year, and
(b) in respect of any year subsequent to the year 2008, 15 December in that year;
'preliminary duty', in relation to a chargeable period ending immediately after a due date, means an amount determined by the formula -
A x B
where -
A is an amount equal to the stamp duty charged on a specified statement in respect of the base period ending immediately prior to the due date, and
B is -
(a) 40 per cent