Set-off entitlement under excise: input credit cannot be carried forward; maintain one-to-one correlation and raise demands if breached. The set-off scheme exempts the final product only to the extent of excise duty equivalent to duty paid on inputs actually consumed; it does not allow accumulation of input credit. Input consumption must be adjusted on clearance using Collector approved norms, maintaining a strict one-to-one correlation between inputs and finished goods. Carrying forward set-off benefits in the RG-23A account for subsequent consignments is prohibited, and demands must be raised where set-off was permitted contrary to the exemption notification and Board instructions.