Transitional job work relief preserves tax neutrality for goods returned within the prescribed period, subject to declaration and credit recovery rules. Transitional relief applies to inputs, semi-finished goods, and goods sent for testing or other processing before the appointed day and returned afterward. No tax is payable if they are returned within six months from the appointed day, with a possible extension of up to two months by the Commissioner on sufficient cause. If the goods are not returned within the allowed period, input tax credit is liable to be recovered under the specified recovery provision. The exemption depends on prescribed declarations of stock held by the job worker on the appointed day.