What you'll learn
The double-entry system forms the foundation of modern accounting and appears throughout your IGCSE Accounting exam. You'll learn how every business transaction affects at least two accounts, understand the rules for debiting and crediting different account types, and develop the skills to record transactions accurately in ledger accounts. This revision guide covers all aspects tested in Pearson Edexcel International IGCSE examinations.
Key terms and definitions
Double-entry bookkeeping — A system of recording financial transactions where every entry to an account requires a corresponding and opposite entry to a different account, ensuring the accounting equation remains balanced.
Debit — An entry recorded on the left-hand side of a ledger account; increases asset and expense accounts, decreases liability, capital and income accounts.
Credit — An entry recorded on the right-hand side of a ledger account; increases liability, capital and income accounts, decreases asset and expense accounts.
Ledger — A book (or computer file) containing all the individual accounts of a business, organized systematically to record all transactions.
Dual aspect — The accounting principle that every transaction has two effects: a receiving aspect and a giving aspect.
Folio — A reference column in a ledger account showing the page number of the corresponding double-entry, enabling cross-referencing between accounts.
Balance — The difference between the total debits and total credits in an account at a particular point in time.
Nominal ledger — The section of the ledger containing all income, expense, and capital accounts (also called the general ledger).
Core concepts
The Accounting Equation and Dual Aspect
Every business transaction affects the accounting equation:
Assets = Capital + Liabilities
The dual aspect principle means each transaction impacts two elements. For example, when a business purchases equipment for cash:
- Assets increase (equipment)
- Assets decrease (cash)
The equation remains balanced because the total value of assets stays the same, simply changing form.
When a business buys goods on credit:
- Assets increase (inventory/stock)
- Liabilities increase (creditors/payables)
Both sides of the equation increase by equal amounts, maintaining balance.
Debit and Credit Rules
Understanding which accounts to debit and credit is essential for accurate recording. The rules derive from the accounting equation:
Asset accounts:
- Debit: increases
- Credit: decreases
Liability accounts:
- Debit: decreases
- Credit: increases
Capital accounts:
- Debit: decreases (drawings)
- Credit: increases (additional capital, profits)
Income/Revenue accounts:
- Debit: decreases
- Credit: increases
Expense accounts:
- Debit: increases
- Credit: decreases
A useful mnemonic: DEAD CLIC
- Debits Expenses Assets Drawings
- Credits Liabilities Income Capital
Structure of Ledger Accounts
Ledger accounts follow a standard T-account format:
[Account Name]
Date | Details | Folio | £ || Date | Details | Folio | £
-----|---------|-------|----||------|---------|-------|----
| | | || | | |
The left side records debits, the right side records credits.
Essential components:
- Account name at the top
- Date column for when the transaction occurred
- Details/Particulars column identifying the corresponding account
- Folio column for cross-referencing (e.g., "P15" = page 15)
- Amount column (£ or other currency)
Recording Transactions in Ledger Accounts
Follow this systematic process for each transaction:
Step 1: Identify which accounts are affected Step 2: Determine the account types (asset, liability, capital, income, expense) Step 3: Apply debit and credit rules Step 4: Record the debit entry in the appropriate account Step 5: Record the corresponding credit entry in the other account Step 6: Cross-reference using folio numbers
Example transaction: Purchased goods for cash £500
Accounts affected:
- Purchases (expense account) — debit increases
- Cash (asset account) — credit decreases
The purchases account receives value (debit), the cash account gives value (credit).
Balancing Ledger Accounts
At regular intervals (month-end, year-end), accounts must be balanced:
Balancing procedure:
- Total both debit and credit columns separately
- Identify which side has the larger total
- Insert a balancing figure on the smaller side labeled "Balance c/d" (carried down)
- Draw a line beneath the balance and total both sides equally
- Bring down the balance on the opposite side labeled "Balance b/d" (brought down)
Debit balance: When total debits exceed total credits (typical for assets and expenses)
Credit balance: When total credits exceed total debits (typical for liabilities, capital and income)
The balance b/d becomes the opening balance for the next accounting period.
Classification of Ledger Accounts
The ledger is organized into three main divisions:
Sales Ledger (Debtors Ledger):
- Contains individual accounts for each credit customer
- Records sales on credit and payments received
- Accounts normally show debit balances (amounts owed to the business)
Purchases Ledger (Creditors Ledger):
- Contains individual accounts for each credit supplier
- Records purchases on credit and payments made
- Accounts normally show credit balances (amounts owed by the business)
Nominal Ledger (General Ledger):
- Contains all other accounts: assets, expenses, income, capital
- Includes cash, bank, purchases, sales, rent, wages, equipment, etc.
- Mixed debit and credit balances depending on account type
The Principles Behind Double-Entry
The system ensures:
Completeness: Every transaction is recorded in full Accuracy: The equation remains balanced Traceability: Cross-referencing enables checking Error detection: Trial balance identifies arithmetic errors
These principles support the historical cost concept (recording transactions at original cost) and money measurement concept (only recording items with monetary value).
Worked examples
Example 1: Recording Multiple Transactions
Sarah Khan starts a business with the following transactions during March 2024:
1 Mar: Started business with capital of £10,000 in the bank 5 Mar: Purchased equipment for £3,000 by cheque 10 Mar: Purchased goods on credit from Ahmed Supplies £1,500 18 Mar: Sold goods for cash £800 25 Mar: Paid Ahmed Supplies £1,000 by cheque
Required: Prepare the Bank Account and Capital Account.
Solution:
Bank Account
Date | Details | £ || Date | Details | £
-----|-------------|-------||------|-------------|------
1 Mar| Capital |10,000 || 5 Mar| Equipment | 3,000
18Mar| Sales | 800 ||25 Mar| Ahmed Suppl.| 1,000
| | ||31 Mar| Balance c/d | 6,800
| Total |10,800 || | Total |10,800
-----|-------------|-------||------|-------------|------
1 Apr| Balance b/d | 6,800 || | |
Capital Account
Date | Details | £ || Date | Details | £
-----|-------------|-------||------|----------|-------
31Mar| Balance c/d |10,000 || 1 Mar| Bank |10,000
| Total |10,000 || | Total |10,000
-----|-------------|-------||------|----------|-------
| | || 1 Apr| Bal. b/d |10,000
Mark scheme points (8 marks available):
- Bank account: capital entry correct [1]
- Bank account: sales entry correct [1]
- Bank account: equipment payment correct [1]
- Bank account: Ahmed Supplies payment correct [1]
- Bank account: correctly balanced [1]
- Capital account: bank entry correct [1]
- Capital account: correctly balanced [1]
- Dates and cross-references present [1]
Example 2: Identifying Debits and Credits
State whether the following accounts would be debited or credited:
(a) Business purchases a vehicle for cash (b) Owner introduces additional capital (c) Business pays rent by cheque (d) Business receives cash from a debtor (e) Business returns faulty goods to a supplier
Solution:
(a) Debit: Vehicle account (asset increases) [1] Credit: Cash account (asset decreases) [1]
(b) Debit: Bank/Cash account (asset increases) [1] Credit: Capital account (capital increases) [1]
(c) Debit: Rent account (expense increases) [1] Credit: Bank account (asset decreases) [1]
(d) Debit: Cash account (asset increases) [1] Credit: Debtor's account (asset decreases) [1]
(e) Debit: Creditor's account (liability decreases) [1] Credit: Purchases Returns account (contra-expense) [1]
Mark scheme: 2 marks per transaction [10 marks total] Award 1 mark for correct debit, 1 mark for correct credit
Example 3: Balancing an Account
The following transactions appear in the Rent Account for April 2024:
2 Apr: Paid rent £450 9 Apr: Paid rent £450 16 Apr: Paid rent £450 23 Apr: Paid rent £450 30 Apr: Paid rent £450
Required: Balance the Rent Account at 30 April 2024.
Solution:
Rent Account
Date | Details | £ || Date | Details | £
-----|----------|-------||-------|-------------|------
2 Apr| Bank | 450 ||30 Apr | Balance c/d | 2,250
9 Apr| Bank | 450 || | |
16Apr| Bank | 450 || | |
23Apr| Bank | 450 || | |
30Apr| Bank | 450 || | |
| Total | 2,250 || | Total | 2,250
-----|----------|-------||-------|-------------|------
1 May| Bal. b/d | 2,250 || | |
Mark scheme (4 marks):
- All five transactions correctly entered on debit side [1]
- Total calculated correctly [1]
- Balance c/d on credit side, correctly dated [1]
- Balance b/d on debit side, correctly dated [1]
Common mistakes and how to avoid them
Reversing debits and credits: Memorize DEAD CLIC or create flashcards drilling each account type. Remember assets and expenses naturally have debit balances, so increases are debits.
Forgetting the dual aspect: Every transaction needs two entries. Before recording, write down both accounts affected and confirm one debit, one credit (for simple transactions).
Incorrect balancing: Always total both sides before inserting balance c/d. The balance goes on the side with the smaller total. Check your arithmetic — both final totals must match exactly.
Omitting dates or folios: In exam questions, dates are usually provided in the scenario. Transfer them accurately. Folio references demonstrate understanding of the complete system, even if abbreviated in exams.
Confusing purchases and purchases returns: Purchases increase expense (debit), purchases returns reduce expense (credit). Similarly for sales (credit income) versus sales returns (debit, reducing income).
Misclassifying account types: Be precise about whether something is an asset, liability, or expense. For example, "equipment" is an asset (debit to increase), but "equipment repairs" is an expense (also debit to increase, but classified differently on financial statements).
Exam technique for "The Double-Entry System"
Identify command words carefully: "Prepare" means write out full ledger accounts with proper format. "State" requires brief answers. "Record" means show the double entry, potentially without full T-accounts. Allocate time according to marks — typically 1–1.5 minutes per mark.
Format scores marks: Even if your entries are correct, missing column headings, dates, or the account name can lose presentation marks. Draw T-accounts with a ruler if time permits. Set out your work clearly with proper debit/credit sides.
Show workings: For balancing questions, write totals clearly. If you make an arithmetic error but show correct method, you can earn method marks. Don't just write the final balance without demonstrating how you calculated it.
Check the accounting equation: After recording transactions, verify assets still equal capital plus liabilities. If they don't balance, you've made an error in your double entry. This quick check can save marks.
Quick revision summary
The double-entry system records every transaction in at least two accounts, maintaining the accounting equation. Debit entries appear on the left, credit entries on the right. Assets and expenses increase with debits; liabilities, capital and income increase with credits. Ledger accounts follow T-account format with dates, details, folios and amounts. Balance accounts by totaling both sides, inserting balance c/d on the smaller side, then bringing the balance down on the opposite side for the next period. Master DEAD CLIC rules and always apply dual aspect to ensure complete, accurate recording.