Rebate of income-tax for resident individuals; full rebate below threshold, tapered rebate where income exceeds threshold. An amendment inserts a rebate of income-tax for resident individuals tied to an income threshold: individuals with total income at or below the threshold receive a deduction equal to 100% of income-tax computed before Chapter deductions; individuals with total income above the threshold receive a deduction equal to the excess of such computed income-tax over the amount by which total income exceeds the threshold, but only if such computed tax exceeds that excess, thereby phasing the rebate as income rises.