Input tax credit distribution rules require ISDs to allocate credits pro rata among recipients based on turnover during the relevant period. Section 20 requires an Input Service Distributor to distribute input tax credit by issuing a document specifying amounts and permits allocation between State and integrated tax as prescribed. Distribution must be against prescribed documentation, not exceed available credit, and allocate credits attributable to a recipient only to that recipient. Where services are attributable to multiple recipients, credit is apportioned pro rata by each recipient's turnover in the State or Union territory during the relevant period relative to the aggregate turnover of attributable recipients. The relevant period is either the preceding financial year or, if unavailable for some recipients, the last quarter for which turnover details exist. 'Recipient of credit' means suppliers with the same PAN as the ISD.