Matching of credit notes triggers adjustments to supplier output tax liability and interest obligations, with reclaim upon recipient declaration. Credit notes issued by a supplier must be matched with corresponding reductions in the recipient's input tax credit claims; matched supplier reductions are accepted and communicated. Discrepancies where supplier reductions exceed recipient declarations, and duplicative reduction claims, are communicated; unresolved discrepancies are added to the supplier's output tax liability in the return for the month following communication, and duplications are added in the month communicated. Suppliers may subsequently reclaim added amounts if the recipient timely declares the credit note, and interest paid on added amounts is refundable by credit to the supplier's electronic cash ledger within prescribed limits.