What you'll learn
The double-entry system forms the foundation of all accounting records tested in CIE IGCSE Accounting examinations. Every financial transaction affects at least two accounts, and understanding how to record these entries correctly in ledger accounts is essential for progressing to more complex topics such as trial balances, final accounts, and correction of errors. This guide covers the principles of double-entry bookkeeping, the structure and preparation of ledger accounts, and the practical application of debits and credits across different account types.
Key terms and definitions
Double-entry system — A method of recording transactions where every entry has two equal and opposite effects, maintaining the accounting equation (Assets = Capital + Liabilities).
Ledger — The principal book of accounts containing all individual accounts where transactions are recorded after being entered in books of prime entry.
Debit (Dr) — An entry on the left-hand side of a ledger account; increases assets and expenses, decreases liabilities, capital, and income.
Credit (Cr) — An entry on the right-hand side of a ledger account; increases liabilities, capital, and income, decreases assets and expenses.
Folio — A reference column in ledger accounts showing the page number or code of the book of prime entry from which the transaction originated.
Balancing off — The process of calculating the difference between the debit and credit sides of an account to determine the closing balance.
Contra entry — A transaction that appears on both sides of the cash book, such as cash withdrawn from bank for office use.
Posting — The transfer of information from books of prime entry to the relevant ledger accounts.
Core concepts
The dual aspect principle
Every business transaction has two aspects: a receiving aspect and a giving aspect. When goods are purchased for cash, the business receives goods (an asset increases) and gives cash (an asset decreases). The dual aspect concept ensures that the accounting equation remains balanced after every transaction.
The accounting equation must always balance:
- Assets = Capital + Liabilities
- Alternatively expressed as: Assets - Liabilities = Capital
When recording transactions, you must identify:
- Which accounts are affected (minimum of two)
- Whether each account increases or decreases
- Whether to debit or credit each account
The rules of debit and credit
The application of debits and credits depends on the classification of the account. CIE IGCSE Accounting examinations regularly test your ability to apply these rules correctly across different account types.
For asset accounts:
- Debit to record an increase
- Credit to record a decrease
- Examples: machinery, motor vehicles, inventory, bank, cash, debtors (accounts receivable)
For liability accounts:
- Debit to record a decrease
- Credit to record an increase
- Examples: bank overdraft, loans, creditors (accounts payable), accrued expenses
For capital accounts:
- Debit to record a decrease (drawings, losses)
- Credit to record an increase (additional capital, profits)
- Capital represents the owner's stake in the business
For income/revenue accounts:
- Debit to record a decrease (returns, discounts)
- Credit to record an increase (sales, commission received, rent received)
For expense accounts:
- Debit to record an increase (purchases, rent, wages, electricity)
- Credit to record a decrease (returns outwards, discounts received)
Structure of ledger accounts
A ledger account follows a standard T-account format with the account name at the top, a debit (Dr) side on the left, and a credit (Cr) side on the right. Each entry must include:
- Date of the transaction
- Details/particulars (name of the other account involved)
- Folio reference (e.g., CB for Cash Book, PDB for Purchases Day Book)
- Amount in the appropriate currency column
Standard ledger account format:
Account Name
Dr Cr
─────────────────────────────────────────────────
Date | Details | Folio | £ | Date | Details | Folio | £
Posting transactions from books of prime entry
Transactions are first recorded in books of prime entry (journals) before being posted to individual ledger accounts. The posting process follows specific patterns:
From Sales Day Book:
- Debit each individual debtor's account (in sales ledger)
- Credit sales account with the total
From Purchases Day Book:
- Debit purchases account with the total
- Credit each individual creditor's account (in purchases ledger)
From Cash Book (receipts side):
- The cash book itself acts as the cash and bank accounts
- Credit the relevant account (e.g., debtors, sales) for each receipt
From Cash Book (payments side):
- The cash book itself acts as the cash and bank accounts
- Debit the relevant account (e.g., creditors, purchases, expenses) for each payment
From Journal Proper:
- Follow the specific debit and credit instructions provided in the journal entry
- Used for non-routine transactions (opening entries, correction of errors, purchase/sale of non-current assets on credit)
Balancing off ledger accounts
At the end of an accounting period, accounts must be balanced off to determine the net position. This process appears frequently in CIE IGCSE examination questions.
Steps to balance a ledger account:
- Total both the debit and credit sides (in pencil or mentally)
- Insert the larger total on both sides as the final line
- On the side with the smaller total, insert the balancing figure as "Balance c/d" (carried down)
- Draw a line under both sides and write the totals level with each other
- Bring down the balance below the line on the opposite side as "Balance b/d" (brought down)
For asset and expense accounts: A debit balance is expected (debit balance b/d appears on the debit side)
For liability, capital, and income accounts: A credit balance is expected (credit balance b/d appears on the credit side)
The three divisions of the ledger
For organisational purposes and easier reference, the ledger is divided into three sections in examination contexts:
Sales Ledger (Debtors Ledger):
- Contains individual accounts for each credit customer
- All accounts normally show debit balances
- Total of balances equals debtors figure in the trial balance
Purchases Ledger (Creditors Ledger):
- Contains individual accounts for each credit supplier
- All accounts normally show credit balances
- Total of balances equals creditors figure in the trial balance
General Ledger (Nominal Ledger):
- Contains all other accounts: assets (except debtors), expenses, income, liabilities (except creditors), capital
- Includes control accounts (total debtors, total creditors) when used
Contra entries
A contra entry occurs when the same transaction affects both the debit and credit sides of the cash book. Common examples include:
- Cash withdrawn from bank for business use: Debit cash column, Credit bank column (both in the cash book)
- Cash paid into bank: Debit bank column, Credit cash column (both in the cash book)
When posting contra entries, the folio reference is typically "C" for contra, and no posting to another ledger account is required as both aspects are recorded within the cash book.
Worked examples
Example 1: Recording and posting a credit purchase
Question: On 15 March 2024, A. Retailer purchased goods on credit from B. Suppliers for £450. Show how this transaction would be recorded in both the purchases day book and the relevant ledger accounts.
Solution:
Purchases Day Book
Date | Supplier | Folio | Amount
15 Mar 2024| B. Suppliers | PL12 | £450
Dr Purchases Account Cr
Date |Details |Folio| £ |Date|Details|Folio| £
15 Mar 2024|B. Suppliers |PDB | 450 | | | |
Dr B. Suppliers Account Cr
Date|Details |Folio| £ |Date |Details |Folio| £
| | | |15 Mar 2024|Purchases |PDB | 450
Explanation: The purchases account (an expense) is debited because expenses increase with debits. B. Suppliers account (a creditor/liability) is credited because liabilities increase with credits. The folio reference PDB indicates Purchases Day Book, and PL12 indicates page 12 of the Purchases Ledger.
Example 2: Balancing a debtor's account
Question: The account of C. Customer shows the following transactions for April 2024. Balance off the account and bring down the balance.
Apr 1 Balance brought forward £340
Apr 8 Sales invoice £220
Apr 15 Cash received £340
Apr 28 Sales invoice £180
Solution:
Dr C. Customer Account Cr
Date |Details |Folio| £ |Date |Details |Folio| £
1 Apr 2024 |Balance b/d| | 340 |15 Apr 2024|Bank |CB | 340
8 Apr 2024 |Sales |SDB | 220 |30 Apr 2024|Balance c/d | | 400
28 Apr 2024|Sales |SDB | 180 | | | |
| | | 740 | | | | 740
1 May 2024 |Balance b/d| | 400 | | | |
Explanation: Total debits = £740 (340 + 220 + 180). Total credits before balancing = £340. The balancing figure is £400, shown as "Balance c/d" on the credit side to make both sides equal £740. The balance is brought down on the debit side (1 May) because this is an asset account (debtor) and the customer still owes £400.
Example 3: Identifying debit and credit entries
Question: For each of the following transactions, identify which accounts are affected and whether each should be debited or credited:
a) Paid wages in cash £350 b) Owner introduced additional capital by cheque £5,000 c) Purchased machinery on credit from D. Equipment Ltd £2,800
Solution:
Transaction a) Paid wages in cash £350
- Debit: Wages account (expense increases)
- Credit: Cash account (asset decreases)
Transaction b) Owner introduced additional capital by cheque £5,000
- Debit: Bank account (asset increases)
- Credit: Capital account (capital increases)
Transaction c) Purchased machinery on credit from D. Equipment Ltd £2,800
- Debit: Machinery account (asset increases)
- Credit: D. Equipment Ltd account (liability increases)
Common mistakes and how to avoid them
Mistake: Confusing which side represents debit and which represents credit in a ledger account. Correction: Remember the acronym DEAD CLIC: Debit side = left (DEbit = LEft), Credit side = right. Always draw T-accounts with clear labels to avoid confusion.
Mistake: Applying the wrong rule to expense accounts, treating them like liabilities. Correction: Expenses are NOT liabilities. Expenses increase with debits because they reduce profit and ultimately reduce capital. An unpaid expense becomes a liability (accrued expense), but the expense account itself follows debit increase/credit decrease rules.
Mistake: Forgetting to double-post transactions, only recording one side of the entry. Correction: Every transaction requires at least two postings. After recording in a book of prime entry, systematically post to both affected accounts. Use a checklist: "What did we receive? (Debit) What did we give? (Credit)."
Mistake: Bringing down balances on the wrong side after balancing off. Correction: The balance c/d and balance b/d always appear on opposite sides. Asset and expense accounts typically show debit balances (brought down on debit side); liability, capital, and income accounts typically show credit balances (brought down on credit side).
Mistake: Recording contra entries twice in the cash book and then posting them to other accounts. Correction: Contra entries affect only the cash book itself (both columns). Mark them with folio "C" for contra and do not post to any other ledger account. They represent internal transfers between cash and bank.
Mistake: Balancing accounts that should not be balanced, such as capital or drawings accounts mid-period. Correction: Some accounts are only balanced at year-end when preparing final accounts. During the period, they accumulate entries without requiring balancing. Only balance accounts when specifically instructed or when preparing a trial balance.
Exam technique for "The Double-Entry System and Ledger Accounts"
Command word "prepare" or "write up": When asked to prepare ledger accounts, you must use the full T-account format with dates, details, folio references, and amounts in columns. Partial or narrative answers receive no credit. Allow sufficient space between accounts and rule off properly after balancing.
Folio references matter: CIE mark schemes allocate marks for correct folio references. Use standard abbreviations: SDB (Sales Day Book), PDB (Purchases Day Book), CB (Cash Book), J (Journal). When posting between ledger accounts, use the account name or page reference as the folio.
Balancing technique: Questions worth 6-8 marks often require balancing multiple accounts. Work methodically: total both sides mentally first, write the larger total on both sides, insert the balance c/d on the lighter side, rule off, then bring down the balance on the opposite side below the line. One mark is typically awarded for the correct balance and one for proper presentation.
Read the date carefully: Examination questions may span a month-end or year-end. Ensure balance c/d is dated on the last day of the period (e.g., 31 May) and balance b/d is dated on the first day of the next period (e.g., 1 June). Incorrect dates lose presentation marks.
Quick revision summary
The double-entry system requires every transaction to be recorded twice: once as a debit and once as a credit. Assets and expenses increase with debits; liabilities, capital, and income increase with credits. Ledger accounts use T-account format with debit entries on the left and credit entries on the right. Transactions are posted from books of prime entry (day books, cash book, journal) to individual ledger accounts. Balancing off accounts involves totalling both sides and carrying down the difference to the next period on the opposite side. The three divisions of the ledger are sales ledger (debtors), purchases ledger (creditors), and general ledger (all other accounts).