Lesson 6 — Control Accounts | O Level Accounting

📘 Lesson 6 of 16

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1. What is a Control Account? 7707 / 3.3

A business that sells goods on credit has many individual customers, each with their own account in the Sales Ledger. Similarly, it has many suppliers recorded in the Purchases Ledger. Keeping track of all these individual accounts can be complex — and errors can easily go unnoticed.

A Control Account is a summary account kept in the General Ledger that records the totals of all transactions already posted to a group of individual accounts. It acts as a check on the accuracy of those individual accounts.

Key Definition: A control account is a ledger account that summarises the combined balance of all accounts in a subsidiary (memorandum) ledger. Its balance should equal the total of all the individual balances in that ledger.

Why are Control Accounts Used?

To check for errors — the control account total must agree with the sum of all individual ledger balances.
To allow division of labour — different clerks can maintain individual ledgers while one person keeps the control account.
To deter fraud — the person posting to individual accounts is different from the person maintaining the control account.
To quickly ascertain the total owed by all debtors or owed to all creditors at any time.
To locate errors quickly — if the control account does not agree with the list of balances, the error must be in the subsidiary ledger.

📌 Cambridge Examiner Note: Control accounts are sometimes called Total Accounts. The Sales Ledger Control Account may be called the Total Debtors Account, and the Purchases Ledger Control Account may be called the Total Creditors Account.

The Two Main Control Accounts

Sales Ledger Control Account (SLCA)

Summarises all transactions in the Sales Ledger (individual debtor accounts). The balance represents the total amount owed to the business by all credit customers.

Purchases Ledger Control Account (PLCA)

Summarises all transactions in the Purchases Ledger (individual creditor accounts). The balance represents the total amount the business owes to all credit suppliers.

2. Sources of Information for Control Accounts

The figures entered into control accounts come from the Books of Original Entry (day books and journals), not from individual ledger accounts. This is what makes them an independent check.

Entry in Control Account	Source Book
Credit sales (SLCA debit)	Sales Day Book — total
Credit purchases (PLCA credit)	Purchases Day Book — total
Returns inwards (SLCA credit)	Returns Inwards Day Book — total
Returns outwards (PLCA debit)	Returns Outwards Day Book — total
Cash/cheque received from debtors (SLCA credit)	Cash Book — receipts column
Cash/cheque paid to creditors (PLCA debit)	Cash Book — payments column
Discount allowed (SLCA credit)	Cash Book — discount allowed column
Discount received (PLCA debit)	Cash Book — discount received column
Bad debts written off (SLCA credit)	General Journal
Contra entry (set-off) — SLCA credit	General Journal
Contra entry (set-off) — PLCA debit	General Journal

💡 Exam Tip: A contra entry (or set-off) occurs when the same person is both a debtor and a creditor. The debt is cancelled against the credit balance. Both the SLCA and the PLCA are reduced by the same amount.

3. Sales Ledger Control Account (SLCA)

The SLCA is a debtor account — it has a normal debit balance, representing the total amount owed to the business by credit customers.

Structure of the SLCA

SLCA — What Goes on Each Side

DR Side (increases amount owed TO us): Credit sales, Dishonoured cheques, Interest charged on overdue accounts CR Side (decreases amount owed TO us): Cash/cheques received, Discount allowed, Returns inwards, Bad debts written off, Contra/set-off

Proforma — Sales Ledger Control Account

Sales Ledger Control Account

Details	$
Balance b/d (opening debtors)	X
Credit Sales (Sales Day Book)	X
Dishonoured cheques	X
Interest on overdue accounts	X
Total	X

Details	$
Cash received from debtors	X
Cheques received from debtors	X
Discount allowed	X
Returns inwards	X
Bad debts written off	X
Contra / set-off	X
Balance c/d (closing debtors)	X
Total	X

Worked Example — SLCA

📋 Example 1: Prepare the Sales Ledger Control Account

The following information is available for the month of March 2026:

Item	$
Debtors balance at 1 March 2026	14,200
Credit sales during March	31,500
Cash received from debtors	18,400
Cheques received from debtors	9,600
Discount allowed	850
Returns inwards	1,200
Bad debts written off	400
Contra entry (set-off)	750

Step 1: Place opening balance and all items that increase what debtors owe on the Debit side.

Step 2: Place all items that reduce what debtors owe on the Credit side.

Step 3: Balance the account — the closing balance goes on the Credit side as balance c/d.

Sales Ledger Control Account — March 2026

Details	$
Balance b/d	14,200
Credit Sales	31,500
Total	45,700

Details	$
Cash received	18,400
Cheques received	9,600
Discount allowed	850
Returns inwards	1,200
Bad debts w/off	400
Contra / set-off	750
Balance c/d	14,500
Total	45,700

Closing balance of SLCA = $14,500 — this is the total amount owed to the business by all credit customers at 31 March 2026. This figure should equal the sum of all individual debtor balances in the Sales Ledger.

4. Purchases Ledger Control Account (PLCA)

The PLCA is a creditor account — it has a normal credit balance, representing the total amount the business owes to its credit suppliers.

Structure of the PLCA

PLCA — What Goes on Each Side

DR Side (reduces what we owe): Cash/cheques paid to creditors, Discount received, Returns outwards, Contra/set-off CR Side (increases what we owe): Opening creditors balance, Credit purchases

Proforma — Purchases Ledger Control Account

Purchases Ledger Control Account

Details	$
Cash paid to creditors	X
Cheques paid to creditors	X
Discount received	X
Returns outwards	X
Contra / set-off	X
Balance c/d (closing creditors)	X
Total	X

Details	$
Balance b/d (opening creditors)	X
Credit Purchases (Purchases Day Book)	X
Total	X

Worked Example — PLCA

📋 Example 2: Prepare the Purchases Ledger Control Account

The following information is available for the month of March 2026:

Item	$
Creditors balance at 1 March 2026	9,800
Credit purchases during March	22,300
Cash paid to creditors	7,500
Cheques paid to creditors	11,200
Discount received	620
Returns outwards	980
Contra entry (set-off)	750

Purchases Ledger Control Account — March 2026

Details	$
Cash paid	7,500
Cheques paid	11,200
Discount received	620
Returns outwards	980
Contra / set-off	750
Balance c/d	11,050
Total	32,100

Details	$
Balance b/d	9,800
Credit Purchases	22,300
Total	32,100

Closing balance of PLCA = $11,050 — this is the total amount owed by the business to all credit suppliers at 31 March 2026.

5. SLCA vs PLCA — Side by Side Comparison

Feature	Sales Ledger Control Account (SLCA)	Purchases Ledger Control Account (PLCA)
Also called	Total Debtors Account	Total Creditors Account
Normal balance	Debit (asset)	Credit (liability)
Subsidiary ledger	Sales Ledger (debtors)	Purchases Ledger (creditors)
Opening balance	DR — balance b/d	CR — balance b/d
New transactions (DR)	Credit sales, Dishonoured cheques	Cash/cheques paid, Discount received, Returns outwards, Contra
New transactions (CR)	Cash/cheques received, Discount allowed, Returns inwards, Bad debts, Contra	Credit purchases
Closing balance	CR — balance c/d (shown as DR b/d next period)	DR — balance c/d (shown as CR b/d next period)
Represents	Total owed to the business	Total owed by the business

6. Reconciling the Control Account Exam Focus

After preparing a control account, the accountant checks whether the balance agrees with the sum of all individual account balances in the subsidiary ledger (the list of debtors or creditors). If there is a difference, a reconciliation statement is prepared to identify errors.

The Principle: The closing balance of the control account must equal the total of all individual balances in the corresponding subsidiary ledger. If they differ, errors exist — either in the control account, in the individual accounts, or both.

Types of Errors and Where They Appear

Error	Affects Control Account?	Affects Individual Ledger?
Incorrect total posted from Day Book to Control Account	✅ Yes	❌ No
Individual debtor's account posted with wrong amount	❌ No	✅ Yes
Entry posted to wrong individual account	❌ No	✅ Yes
Entry omitted from Control Account	✅ Yes	❌ No
Entry omitted from individual account	❌ No	✅ Yes
Balance on individual account extracted incorrectly	❌ No	✅ Yes

How to Write a Reconciliation Statement

When a difference is found, the reconciliation statement starts with one figure (either the control account balance or the list of balances total) and adjusts it to arrive at the other.

📋 Example 3: Reconciliation of the Sales Ledger Control Account

After preparing the SLCA, the following situation was discovered:

SLCA closing balance: $14,500
Total of individual debtor balances in Sales Ledger: $13,850
The Sales Day Book total of $31,500 had been over-added by $200 — so the control account is too high by $200.
A credit sale of $450 to customer Ahmed had been entered in the account of customer Ahmer in error — this does not affect the control account.

Step 1: Correct the Control Account

Adjustment to SLCA	$
Balance per SLCA (before correction)	14,500
Less: Over-addition in Sales Day Book	(200)
Corrected SLCA balance	14,300

Step 2: Correct the List of Individual Balances

Adjustment to List of Balances	$
Total per list of individual balances (before correction)	13,850
Add: Correct Ahmed's account (add $450 omitted)	450
Less: Remove from Ahmer's account (posted in error)	(450)
Corrected list total	13,850

⚠️ Wait — they still don't agree! After both corrections, SLCA = $14,300 but list = $13,850. The difference of $450 remains. This means there is another error — perhaps Ahmed's account was never debited at all. The accountant must investigate further.

💡 Exam Tip: In the exam, once you have adjusted both sides and they agree, state clearly: "The corrected balance of the SLCA agrees with the corrected total of the list of debtors' balances." Examiners reward this concluding statement.

Flow of the Reconciliation Process

Prepare Control Account

→

Extract list of individual balances

→

Compare the two totals

→

Identify & correct errors

→

Confirm they agree ✓

7. Memory Aids & Common Mistakes

🧠 Memory Aid — SLCA DR side

Remember "D-I-D" for the Debit side of SLCA:
Debtors opening balance | Invoices (credit sales) | Dishonoured cheques

🧠 Memory Aid — PLCA CR side

Remember "OB + P" for the Credit side of PLCA:
Opening creditor Balance + Purchases (credit)

⚠️ Common Mistake 1 — Discount: Students often put discount on the wrong side. Remember: Discount Allowed reduces what debtors owe → CREDIT the SLCA. Discount Received reduces what we owe creditors → DEBIT the PLCA.

⚠️ Common Mistake 2 — Bad Debts: Bad debts are written off only in the SLCA (credit side), never in the PLCA. A bad debt reduces the amount a debtor owes us.

⚠️ Common Mistake 3 — Dishonoured Cheques: If a customer's cheque is returned unpaid by the bank, the amount must be added back to the SLCA on the Debit side (the debt exists again). This is a very common exam item.

⚠️ Common Mistake 4 — Contra Entry: In a contra (set-off), the same amount appears on the credit side of SLCA and the debit side of PLCA. It reduces both the debtor and creditor balance by the same figure.

📝 Exam Practice Questions

Question 1 Knowledge — 2 marks

State two purposes of a Sales Ledger Control Account.

Any two of the following (1 mark each):

To provide a check on the accuracy of the individual debtor accounts in the Sales Ledger.
To allow quick identification of the total amount owed by all credit customers at any time.
To detect and help locate errors in the Sales Ledger.
To deter fraud by separating the person maintaining individual accounts from the person maintaining the control account.
To allow division of labour in the accounting department.

📌 Examiner Note: Vague answers like "to check for mistakes" will not receive full marks. Be specific about what is being checked and how.

Question 2 Application — 6 marks

Prepare the Purchases Ledger Control Account for April 2026 from the following information:

Item	$
Creditors balance at 1 April 2026	6,400
Credit purchases	18,750
Cheques paid to creditors	14,200
Discount received	380
Returns outwards	650
Contra / set-off	500

Purchases Ledger Control Account — April 2026

Details	$
Cheques paid	14,200
Discount received	380
Returns outwards	650
Contra / set-off	500
Balance c/d	9,420
Total	25,150

Details	$
Balance b/d	6,400
Credit Purchases	18,750
Total	25,150

📌 Working: CR total = 6,400 + 18,750 = 25,150. DR items before balance = 14,200 + 380 + 650 + 500 = 15,730. Balance c/d = 25,150 − 15,730 = $9,420.

Question 3 Application — 8 marks

Prepare the Sales Ledger Control Account for May 2026:

Item	$
Debtors balance at 1 May 2026	21,300
Credit sales	44,800
Cash received from debtors	12,600
Cheques received from debtors	22,400
Discount allowed	1,100
Returns inwards	2,200
Bad debts written off	850
Dishonoured cheque	600
Contra / set-off	500

Sales Ledger Control Account — May 2026

Details	$
Balance b/d	21,300
Credit Sales	44,800
Dishonoured cheque	600
Total	66,700

Details	$
Cash received	12,600
Cheques received	22,400
Discount allowed	1,100
Returns inwards	2,200
Bad debts w/off	850
Contra / set-off	500
Balance c/d	27,050
Total	66,700

📌 Working: DR total = 21,300 + 44,800 + 600 = 66,700. CR items before balance = 12,600 + 22,400 + 1,100 + 2,200 + 850 + 500 = 39,650. Balance c/d = 66,700 − 39,650 = $27,050.

Question 4 Analysis — 6 marks

The Sales Ledger Control Account shows a closing balance of $18,200. The total of the list of individual debtor balances is $17,500. On investigation, the following errors were found:

The Sales Day Book had been over-cast (over-added) by $500.
A credit sale of $300 to customer Basit had been debited to the account of customer Bashir.
A payment of $200 received from a debtor had been omitted from the individual debtor's account.

Prepare a statement to reconcile the two figures after correcting the errors.

Step 1: Correct the SLCA balance

Item	$
Balance per SLCA (unadjusted)	18,200
Error 1: Less over-cast of Sales Day Book	(500)
Corrected SLCA balance	17,700

Step 2: Correct the list of individual balances

Item	$
Total per list of balances (unadjusted)	17,500
Error 2: No net effect (same total, wrong accounts)	—
Error 3: Less payment omitted from individual account	(200)
Corrected list total	17,300

⚠️ Note: After corrections, SLCA = $17,700 and list = $17,300 — they still differ by $400. This means there is at least one more undetected error. A student who correctly applies each adjustment and states the remaining difference will receive full method marks.

📌 Key rule: Error 2 affects both Basit's and Bashir's accounts, but the total of all balances stays the same — so no adjustment is needed to the list total. Only errors that change the total of all balances require an adjustment.

Question 5 Knowledge — 3 marks

Explain what is meant by a contra entry (set-off) in the context of control accounts and state how it is recorded.

A contra entry (set-off) arises when the same person is both a debtor and a creditor of the business — i.e., the business sells goods to and buys goods from the same company.

The two balances are offset against each other and cancelled to the extent of the smaller balance.

Recording:

The amount is entered on the credit side of the SLCA (reducing debtors).
The same amount is entered on the debit side of the PLCA (reducing creditors).

📌 Both entries are for the same amount, and the source book is the General Journal.

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