Rebate for securities transaction tax: deduction from income-tax on business securities gains subject to payment evidence and cap. A rebate permits deduction of securities transaction tax paid from the income-tax liability on profits from taxable securities transactions, where such profits are business income. The deduction requires prescribed evidence of payment, is limited to the income-tax on that income computed using the average rate of income-tax, and was legislatively discontinued for assessment years from the specified cut-off. Definitions of 'taxable securities transaction' and 'securities transaction tax' are as provided in the relevant finance enactment.