Composition Levy option limits eligibility and denies input tax credit while setting capped turnover-based rates. Composition Levy permits a registered person below the prescribed turnover threshold to pay tax as a fixed percentage of turnover in lieu of regular tax, subject to prescribed rates and conditions. The option lapses when turnover exceeds the threshold. Eligible persons are excluded from making inter-State supplies, certain services, supplies through specified e-commerce operators, and notified manufacturing; they must not collect tax from recipients and are not entitled to input tax credit. Ineligibly availing the scheme attracts tax determination and penalties under the Act.