Rulemaking power enables detailed tax procedural and substantive rules, including estimation methods and electronic filing requirements. The statute vests a central administrative body with broad rulemaking power, subject to executive control, to prescribe procedural, substantive and administrative rules necessary to implement the taxation code. Rules may cover income ascertainment and estimation methods, valuation of perquisites, depreciation rates, deduction conditions, PAN allotment and quoting, forms and electronic return procedures, documentary production on demand, appeal and refund procedures, interest calculation conventions, panel constitution and remuneration, registers of practitioners, certification of tax payment, international relief procedures, and may be given retrospective effect where permitted.