Input Service Distributor credit transfer: invoices must record supplier reference, taxable value, recipient and authorised signature. ISDs must issue invoices or credit notes when distributing or reducing input tax credit, specifying ISD and recipient identification, a unique serial number for the financial year, date, amount of credit distributed and authorised signature. Registered persons with the same PAN and state code may transfer common input service credit to an ISD by invoice, credit or debit note showing the supplier and original invoice reference, taxable value equal to the common services, rate and amount of credit transferred, prescribed serialisation, and authorised signature.