• They provide a checking mechanism to detect errors and fraud
• They remove bulky details from the general ledger
• They allow different staff to maintain the control account and the subsidiary ledger independently, reducing fraud
• The trial balance shows totals rather than individual accounts

The Purchases Ledger Control Account records all transactions with suppliers on credit.

Key formula: Opening Balance + Credit Purchases − Cash Paid − Discounts Received − Returns Outward = Closing Balance (Creditors)

The Sales Ledger Control Account records all amounts owed by customers on credit.

Key formula: Opening Balance + Credit Sales − Cash Received − Discounts Allowed − Returns Inward − Bad Debts = Closing Balance (Debtors)

The following information relates to Juma's Shop for the month of January 2023:

• Balance of sales ledger (debtors) on 1st January 2023: TZS 150,000
• Balance of purchases ledger (creditors) on 1st January 2023: TZS 80,000
• Credit sales during January: TZS 420,000
• Credit purchases during January: TZS 310,000
• Cash received from customers: TZS 350,000
• Cash paid to suppliers: TZS 250,000
• Discounts allowed to customers: TZS 15,000
• Discounts received from suppliers: TZS 12,000
• Returns inward: TZS 8,000
• Returns outward: TZS 6,000

Prepare the Sales Ledger Control Account and Purchases Ledger Control Account.

Solution: Sales Ledger Control Account

Verification: Opening 150,000 + Credit Sales 420,000 − Cash 350,000 − Discounts 15,000 − Returns 8,000 = 177,000 ✓

Solution: Purchases Ledger Control Account

Verification: Opening 80,000 + Credit Purchases 310,000 − Cash 250,000 − Discounts 12,000 − Returns 6,000 = 122,000 ✓

1. Open with the balance b/d — bring down the opening balance from the previous period
2. Record credit transactions — enter credit sales on the debit side and credit purchases on the credit side
3. Enter cash transactions — cash received goes on the credit side of Sales Ledger; cash paid goes on the debit side of Purchases Ledger
4. Record discounts and returns — discounts allowed and returns inward reduce the sales ledger; discounts received and returns outward reduce the purchases ledger
5. Balance the account — calculate the difference between the two sides to find the closing balance
6. Verify accuracy — the closing balance should equal the total of all individual balances in the subsidiary ledger

In Tanzania, control accounts are used by businesses like wholesale shops in Kariakoo or supermarkets in Dar es Salaam to verify that their sales and purchases records are accurate. For example, a shop owner can compare the total shown in the Purchases Ledger Control Account with the sum of all supplier statements to ensure no payments were missed or recorded incorrectly, which helps prevent fraud and keeps the business financially healthy.