Customs duty rationalization adjusts tariff rates and exemptions, recalibrating AIDC and social welfare surcharge impacts on imports. The Finance Bill, 2023 and associated notifications reconfigure import duty architecture by reducing the number of BCD rates, recalibrating BCD, AIDC and SWS for selected goods, and imposing targeted increases or reductions on chemicals, petrochemicals, precious metals, vehicles, electronics inputs and consumer items; certain exemptions are time limited or rescinded while others are extended for review. Concurrently, NCCD rates on cigarettes are revised and legislative amendments to the Customs Act, Customs Tariff Act, CGST and IGST Acts introduce procedural time limits, retrospective validations, input tax credit restrictions, decriminalisation and information sharing provisions, with many changes effective immediately by notification or upon enactment.