No income tax is payable for total taxable income up to Rs 5 lakh in both the old and new tax regimes. If senior citizens or super senior citizens choose the new tax regime, they will have to forego the benefit of the higher exemption ceiling. Under the new optional regime, the higher exemption limit of Rs 3 lakh for senior citizens and Rs 5 lakh for super senior citizens will no longer be available. The baseline exemption ceiling for all taxpayers would remain at Rs 2.5 lakh under the new tax regime.