Company income-tax computation now deducts additional tax and distribution-related tax adjustments when determining tax payable. Amendment to section 280ZB Explanation 2 directs that a company's income-tax for any assessment year is computed after allowing applicable reliefs, rebates and deductions, and then reduced by (a) any additional income-tax under section 104 and (b) specified distribution-related adjustments: for the 1965 assessment year, reductions in rebate linked to bonus shares or dividends; and for the 1966 and subsequent assessment years, income-tax charged under the annual Finance Act with reference to dividend distributions.