Advance tax computation: estimate current income, add surcharge and cess, allow credits, deduct actual TDS/TCS to fix liability.

Advance tax is computed by estimating the current year's income, computing tax at rates in force, adding applicable surcharge and health and education cess, allowing specified reliefs, and deducting allowable carryforward tax credits and tax deductible or collectible at source actually deducted/collected; the balance above the statutory threshold is payable in installments. TDS/TCS not actually deducted or collected cannot be reduced from advance tax. For AO determination, current income is the higher of the latest assessed year's total income or the total income returned for any subsequent year, and tax so computed is reduced by expected TDS/TCS to arrive at advance tax.

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