Assessable value computation: deduct only duty payable under schedules, excluding input-credit notifications, from cum-duty price. Deduct from the cum-duty price the amount of duty actually payable on the goods under assessment as specified in the First Schedule read with notifications under Rule 8; notifications granting input-duty credit are not to be treated as the deductible duty. Field formations must review inconsistent assessments and take remedial action in accordance with the 1982 explanatory instructions.