This document outlines the provisions for computing income on an estimated basis for certain businesses and taxpayers under section 44AD of the Income Tax Act. It provides that eligible taxpayers engaged in eligible businesses with annual turnover less than Rs. 1 crore can opt to pay tax on estimated income of 8% of their gross receipts. All deductions are deemed allowed. Taxpayers can declare a higher income but must maintain books of accounts if total income exceeds exemption limits.