Capital gains rate revision: short-term rates increased and long-term gains taxed at a higher fixed rate after amendment. Amendment substitutes provisos to change tax computation: short-term capital gains under section 111A are taxed at one fixed rate for transfers before the effective date and at a higher fixed rate for transfers on or after that date; long-term capital gains under section 112A above the statutory threshold are taxed at a fixed rate that likewise differs by whether the transfer occurs before or on/after the effective date, and the threshold applies on aggregate of the long-term gains.