Surtax rates introduced: tiered surtax on chargeable profits with lower rate on initial capital tranche, higher rate on remaining profits. Amendment replaces the Third Schedule to the Companies (Profits) Surtax Act, 1964, establishing a two tier surtax: a lower rate on the portion of the chargeable amount up to five per cent of capital as computed under the Second Schedule, and a higher rate on the balance of the chargeable amount; this Schedule takes effect from the first day of April, 1972, and the related section reference in section 18 is substituted with effect from the first day of January, 1972.