Transitional Input Tax Credit rules govern refunds, recoveries and carry forward of credits during GST transition for registered persons. Transitional provisions specify that returned goods sold within six months before the appointed day and returned within six months after it may yield refunds under the existing law; registered person returns are treated as supplies. Pre appointed contracts with post appointed price changes require supplementary invoices/debit notes or credit notes, with credit usable only if recipients reduce their ITC. Proceedings, refunds and recoveries under prior law are to be concluded under that law; amounts refunded thereunder are paid in cash, while rejected or recovered sums are not admissible as ITC under this Act. VAT and service tax paid pre transition may be credited for post appointed supplies as prescribed.