Internal Account

Regarding internal accounts: internal account is "one per bank". Or, to be more exact, there are as many internal accounts in bank, as there are different purposes to collect the money on banks side. So, there can be one internal account for collecting interest from all customer main accounts, one internal account for collecting interest from all customers loan accounts, one internal account to collect unpaid debts for subscription fees, ... but what is important, every customer account sends money to the same one bank internal account, so from this point of view, it is one common bank's internal account for all customers. So there is "one" (or a few) internal accounts in bank.