I now have all the information needed. Let me compile the full breakdown.
Important note from the textbook (CA Final DT, BB): The higher surcharge rates of 25% and 37% are applicable where total income exceeds ₹2 crore and ₹5 crore, respectively. However, these higher surcharge rates do NOT apply to tax payable at special rates under sections 111A, 112 and 112A - but they do apply to Section 115BB (lottery) income. Under the default regime, the maximum surcharge is capped at 25%.
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TDS at source: The lottery organiser will deduct ₹30 crore (30%) as TDS under Section 194B before paying you. The remaining surcharge and cess are settled when you file your ITR.
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No deductions allowed: You cannot reduce your tax liability using 80C (PPF, LIC), 80D (health insurance), HRA, or any other deduction. The ₹100 crore is taxed in full at 30%.
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Marginal relief: If the total income is, say, ₹5.01 crore (not ₹100 crore), marginal relief provisions apply to prevent the surcharge from exceeding the income above the threshold. At ₹100 crore this is irrelevant.
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Regime choice: The new default regime (115BAC) caps surcharge at 25%, saving you ~₹3.744 crore versus the old regime at ₹100 crore winnings. Most winners would benefit from the new regime.
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Losses cannot be set off: Any losses under other heads of income (e.g., business losses) cannot be set off against lottery winnings.
Sources: Section 115BB & 194B, Income Tax Act 1961; CA Final Direct Tax textbook by CA Bhanwar Borana;
ClearTax lottery guide;
49Tax AY 2026-27 guide