Composition levy option: small registered taxpayers may pay a prescribed flat rate instead of regular GST, subject to eligibility. A registered person below the prescribed aggregate turnover threshold may opt to pay GST by a prescribed flat rate in lieu of tax, subject to eligibility conditions and prescribed restrictions; such persons may not collect tax or claim input tax credit, the option lapses when turnover exceeds the threshold, and wrongful availing attracts tax and penalty with applicable assessment provisions.