Exclusive jurisdiction of the Settlement Commission governs exercise of income tax authority powers in permitted settlement matters. The Settlement Commission holds all powers of an income-tax authority and, when a settlement application is permitted to proceed, has exclusive jurisdiction to exercise those powers in relation to the case, subject to provisos limiting exclusivity where applications are rejected, declared invalid, or disallowed from further proceeding. Other statutory provisions, including self-assessment obligations, remain operative unless the Commission expressly directs otherwise. The Commission may regulate its own procedure and that of its Benches, and the same powers and procedural regime are applied to the Interim Board.