If your total tax liability exceeds ₹10,000 in a year (after TDS), you must pay advance tax in four instalments. Missing them attracts 1% interest per month under Sections 234B/C.
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Cumulative percentages of net tax: 15% by 15 June, 45% by 15 September, 75% by 15 December, 100% by 15 March. Senior citizens without business income are exempt from advance tax.
Interest under 234B/C for under-payment is not calculated here. Consult a CA if your income includes capital gains or business income. See our full disclaimer.