Not every business can maintain a full set of audited accounts, and the presumptive tax regime exists for exactly those firms. Under the scheme the department estimates taxable income from turnover using prescribed ratios rather than requiring the business to prove every expense, so the assessment follows a simple formula on the declared sales figure. The scheme is a genuine convenience and a genuine trade-off. The trader avoids the burden of full bookkeeping and the risk of disputes over costs, but the fixed ratio can produce a higher tax than a well-documented expense claim would have. For a small grocery or a neighbourhood shopkeeper, simplicity usually wins over the theoretical savings of full accounting. Staying within the scheme requires the formal conditions: a turnover below the prescribed threshold, a proper PAN and timely filing of the returns the department specifies. Climbing above the threshold moves the business into the regular regime with its full obligations. Because the choice is not personal but statutory, growing firms should review each year before return season, so the transition is planned rather than forced.