(1) Section 958 of the Principal Act is amended -
(a) in subsection (1) -
(i) in paragraph (a) -
(I) by inserting the following definition after "corres ponding corporation tax for the preceding chargeable period":
"'corresponding income tax for the preceding chargeable period', in relation to a chargeable period which is an accounting period of a company, means an amount determined by the formula -
where -
I is the income tax payable under section 239 or 241 by the chargeable person for the preceding chargeable period,
C is the number of days in the chargeable period, and
P is the number of days in the preceding chargeable period;",
(II) by substituting the following for the definition of "tax payable for the initial period":
"'tax payable for the initial period', in relation to a chargeable period which is -
(I) a year of assessment for capital gains tax (being the years of assessment 2003 to 2008 inclusive), means the tax which would be payable by the chargeable person if the year
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