Matching of input tax credit: unmatched or duplicate credits add to output tax liability and attract statutory interest. Matching of inward supply details with supplier returns and import tax records is required; reconciled claims of input tax credit are accepted and communicated. Discrepancies and duplicated claims are notified; unresolved discrepancies are added to the recipient's output tax liability and attract interest from the date credit was availed. If the supplier later corrects returns within the permitted period, the recipient may reduce the added liability and obtain refund of interest to the electronic cash ledger, capped at the interest paid by the supplier; unauthorized reductions are re added and subject to higher interest.