Introduction to Double Entry System
"Every business transaction affects at least two accounts."
The Double Entry System is the backbone of modern accounting. It was documented by Luca Pacioli, an Italian mathematician, in 1494. This system ensures that the accounting equation (Assets = Liabilities + Capital) always remains balanced.
What is Double Entry System?
Definition: A system where every transaction is recorded in at least two accounts - one account is debited, and another is credited with equal amounts.
Core Principle: Dual Aspect Concept - Every transaction has two effects.
Example:
- You buy furniture for ₹50,000 cash.
- Effect 1: Furniture (Asset) increases by ₹50,000 → Debit Furniture
- Effect 2: Cash (Asset) decreases by ₹50,000 → Credit Cash
The Accounting Equation
ASSETS = LIABILITIES + CAPITAL
This equation must always be in balance after every transaction.
Example:
- Started business with ₹1,00,000 cash.
- Assets (Cash) = ₹1,00,000
- Capital = ₹1,00,000
- Liabilities = ₹0
- Balanced: ₹1,00,000 = ₹0 + ₹1,00,000 ✓
Types of Accounts
All accounts are classified into 3 main categories:
1. Personal Accounts
Accounts representing persons or entities.
Types:
- Natural Persons: Individuals (Ramesh, Suresh)
- Artificial Persons: Companies, Banks, Firms (Tata Motors Ltd., State Bank of India)
- Representative Personal Accounts: Represent a group (Outstanding Salary A/c, Prepaid Insurance A/c)
Golden Rule:
Debit the Receiver
Credit the Giver
Example: Paid cash to Ramesh ₹5,000.
- Ramesh receives → Debit Ramesh
- Cash gives → Credit Cash
2. Real Accounts
Accounts representing assets and properties that have a physical existence or value.
Types:
- Tangible Real Accounts: Physical assets (Cash, Furniture, Machinery, Building)
- Intangible Real Accounts: Non-physical assets (Goodwill, Patents, Trademarks)
Golden Rule:
Debit what comes in
Credit what goes out
Example: Purchased machinery for ₹2,00,000 cash.
- Machinery comes in → Debit Machinery
- Cash goes out → Credit Cash
3. Nominal Accounts
Accounts representing expenses, incomes, losses, and gains.
Characteristics:
- These accounts are temporary (closed at year-end).
- Balances transferred to Profit & Loss Account.
Golden Rule:
Debit all Expenses and Losses
Credit all Incomes and Gains
Examples:
- Paid salaries ₹30,000 → Debit Salary (expense)
- Received commission ₹5,000 → Credit Commission Received (income)
The Golden Rules Summary
| Account Type | Debit | Credit |
|---|---|---|
| Personal Account | The Receiver | The Giver |
| Real Account | What Comes In | What Goes Out |
| Nominal Account | All Expenses and Losses | All Incomes and Gains |
Modern Approach: Debit and Credit Rules
In modern accounting, we classify based on the accounting equation:
| Account Type | Debit (Increase) | Credit (Decrease) |
|---|---|---|
| Assets | Increase in Asset | Decrease in Asset |
| Liabilities | Decrease in Liability | Increase in Liability |
| Capital | Decrease in Capital (Drawings) | Increase in Capital |
| Expenses | Increase in Expense | Decrease in Expense (rare) |
| Income | Decrease in Income (rare) | Increase in Income |
Step-by-Step: How to Record a Transaction
Transaction: Purchased goods for ₹10,000 from Mohan on credit.
Step 1: Identify the accounts involved
- Purchases A/c (Nominal - Expense)
- Mohan A/c (Personal - Creditor)
Step 2: Classify the accounts
- Purchases = Nominal Account
- Mohan = Personal Account
Step 3: Apply the golden rules
- Purchases (Expense) → Debit
- Mohan (Giver) → Credit
Journal Entry:
Purchases A/c Dr. ₹10,000
To Mohan A/c ₹10,000
(Being goods purchased on credit)
Advantages of Double Entry System
Why Double Entry is Superior:
- Complete Record: Both aspects of every transaction are recorded.
- Accuracy: Self-balancing nature helps detect errors.
- Trial Balance: Can be prepared to verify arithmetical accuracy.
- Financial Statements: Enables preparation of P&L and Balance Sheet.
- Audit Trail: Easy to trace transactions.
- Comparisons: Allows comparison across periods.
- Tax Compliance: Accepted by tax authorities and auditors.
Real-World Example
Reliance Industries - Everyday Transactions
-
Paid electricity bill ₹50,000 cash:
- Electricity (Nominal - Expense) → Debit
- Cash (Real - Asset) → Credit
-
Received cash from customer Walmart ₹10 Lakhs:
- Cash (Real - Asset) → Debit
- Walmart (Personal - Debtor) → Credit
-
Owner withdrew ₹2 Lakhs for personal use:
- Drawings (Personal - Reduces Capital) → Debit
- Cash (Real - Asset) → Credit
Quiz: Double Entry System
Test Your Knowledge
Question 1 of 5
1. In a Personal Account, who do you debit?