Step-by-step explanation:
Payables control accounts helps to maintain each supplier account as a separate subsidiary ledger and reducing the amount of postings in the general ledger. Receivables control account is useful to maintain the credit sales through separate subsidiary ledger.
When there is a control account then the the trial balance of the firm can be easily prepared by seeing the general ledger.
Book keeping errors can also be identified by reconciling the balance on accounts payable and general ledger accounts.