Alternate Minimum Tax computation requires adjusted total income with specified deductions and certified computation by a qualified accountant. The form mandates a certificate by a qualified accountant or authorised auditor certifying that adjusted total income and alternate minimum tax have been computed in accordance with Chapter XII-BA. Annexure A must list assessee identification, assessment year, total income before Chapter XII-BA, income-tax on that total, deductions under Chapter VI-A (excluding certain items) and deductions under section 10AA. Adjusted total income equals the pre-Chapter XII-BA total plus the specified deductions, and the alternate minimum tax is computed as a prescribed proportion of that adjusted total income.