Tax credit for goods held by agents, subject to registration, stock declaration, invoice timing, and reversal by principal. Agent entitlement to take input tax credit is allowed for goods of a principal lying at the agent's premises on the appointed day, subject to conditions: the agent is a registered taxable person; both principal and agent declare stock details for the date immediately preceding the appointed day in prescribed form and time; invoices were issued not earlier than twelve months preceding the appointed day; and the principal has reversed or not availed of the input tax credit for those goods.