Fortnightly duty payment: manufacturers must debit account current or use CENVAT credit, or face interest and forfeiture. Manufacturers must assess duty per consignment, record details in Form RG-I, and indicate duty on each gate pass or invoice. Total duty for each fortnight is to be discharged by debiting an account current or by utilising CENVAT credit; a calendar-month option remains for specified exemptions. Late payment attracts interest and persistent default leads to temporary forfeiture of instalment facility, mandatory per-consignment payment, and potential treatment of clearances as unpaid with attendant penalties.