CLASS XI CHAPTER 3(B) ACCOUNTING EQUATION: RULE OF DEBIT AND CREDIT (WITH EXAMPLES)

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The Accounting Equation & Rules of Debit and Credit

At the heart of the Double Entry System lies a single, unbreakable mathematical truth: The Accounting Equation. Every single business transaction affects this equation, but the two sides must always remain perfectly balanced.

The Fundamental Accounting Equation

ASSETS = LIABILITIES + CAPITAL

• Assets: What the business owns (Cash, Bank, Machinery, Stock).
• Liabilities: What the business owes to outsiders (Creditors, Bank Loans).
• Capital (Equity): What the business owes to the owner (Owner's investment + Profits - Drawings).

⚖️ The Modern Rules of Debit (Dr.) & Credit (Cr.)

To record how transactions change the equation, we use the modern C.L.E.A.R. method.

Account Category	If it INCREASES (↑)	If it DECREASES (↓)
C - Capital (Owner's Equity)	Credit	Debit
L - Liabilities (Debts)	Credit	Debit
E - Expenses (Costs/Losses)	Debit	Credit
A - Assets (Properties/Cash)	Debit	Credit
R - Revenue (Income/Gains)	Credit	Debit

Notice the pattern: Assets and Expenses increase on the Debit side. Capital, Liabilities, and Revenue increase on the Credit side.

📝 Detailed Step-by-Step Analysis

Let’s trace a series of continuous transactions for Mr. A's business to understand the logic. After each transaction, we will verify the Accounting Equation to ensure both sides remain perfectly balanced.

Example 1: Starting the Business

Transaction: Mr. A started a business with Cash ₹1,00,000.

Analysis: The business receives cash (Asset ↑). It now owes this money to the owner (Capital ↑).

Rule Applied: Debit Cash A/c | Credit Capital A/c

Transaction	ASSETS (₹)			=	LIAB (₹)	+	CAPITAL (₹)
	Cash	Furniture	Stock		Creditors		Capital
Started with cash	+ 1,00,000			=		+	+ 1,00,000
New Equation	1,00,000	0	0	=	0	+	1,00,000

Example 2: Purchasing an Asset for Cash

Transaction: Purchased furniture for cash ₹20,000.

Analysis: Furniture comes in (Asset ↑), but Cash goes out (Asset ↓).

Rule Applied: Debit Furniture A/c | Credit Cash A/c

Transaction	Cash	Furniture	Stock	=	Creditors	+	Capital
Old Equation	1,00,000	0	0	=	0	+	1,00,000
Purchased furniture	- 20,000	+ 20,000		=
New Equation	80,000	20,000	0	=	0	+	1,00,000

Example 3: Purchasing Goods on Credit

Transaction: Purchased goods (stock) from Rahul for ₹30,000 on credit.

Analysis: Stock comes in (Asset ↑). We haven't paid, creating a creditor (Liability ↑).

Rule Applied: Debit Purchases A/c | Credit Rahul's A/c

Transaction	Cash	Furniture	Stock	=	Creditors	+	Capital
Old Equation	80,000	20,000	0	=	0	+	1,00,000
Purchased goods			+ 30,000	=	+ 30,000
New Equation	80,000	20,000	30,000	=	30,000	+	1,00,000

Example 4: Selling Goods for Cash (With Profit)

Transaction: Sold goods costing ₹10,000 for ₹15,000 in cash.

Analysis: Cash comes in by ₹15,000 (Asset ↑). Stock goes out by ₹10,000 (Asset ↓). The ₹5,000 profit belongs to the owner (Capital ↑).

Rule Applied: Debit Cash A/c | Credit Sales A/c

Transaction	Cash	Furniture	Stock	=	Creditors	+	Capital
Old Equation	80,000	20,000	30,000	=	30,000	+	1,00,000
Sold goods for cash	+ 15,000		- 10,000	=		+	+ 5,000 (Profit)
New Equation	95,000	20,000	20,000	=	30,000	+	1,05,000

Example 5: Paying an Expense

Transaction: Paid rent of ₹5,000 in cash.

Analysis: Cash goes out (Asset ↓). Rent is an expense, and all expenses reduce the owner's Capital (Capital ↓).

Rule Applied: Debit Rent A/c | Credit Cash A/c

Transaction	Cash	Furniture	Stock	=	Creditors	+	Capital
Old Equation	95,000	20,000	20,000	=	30,000	+	1,05,000
Paid rent	- 5,000			=		+	- 5,000 (Exp)
New Equation	90,000	20,000	20,000	=	30,000	+	1,00,000

Example 6: Settlement of a Liability

Transaction: Paid ₹20,000 cash to Rahul (the creditor).

Analysis: Cash goes out (Asset ↓), and our debt to Rahul decreases (Liability ↓).

Rule Applied: Debit Rahul's A/c | Credit Cash A/c

Transaction	Cash	Furniture	Stock	=	Creditors	+	Capital
Old Equation	90,000	20,000	20,000	=	30,000	+	1,00,000
Paid creditor	- 20,000			=	- 20,000
New Equation	70,000	20,000	20,000	=	10,000	+	1,00,000

Example 7: Owner Withdrawing Cash

Transaction: Mr. A withdrew ₹10,000 for personal use.

Analysis: Cash goes out (Asset ↓). Because the owner takes money out, their investment is reduced via Drawings (Capital ↓).

Rule Applied: Debit Drawings A/c | Credit Cash A/c

Transaction	Cash	Furniture	Stock	=	Creditors	+	Capital
Old Equation	70,000	20,000	20,000	=	10,000	+	1,00,000
Drawings	- 10,000			=		+	- 10,000 (Draw)
New Equation	60,000	20,000	20,000	=	10,000	+	90,000

Example 8: Receiving Income/Revenue

Transaction: Received commission of ₹2,000 in cash.

Analysis: Cash comes in (Asset ↑). Commission is a revenue, and all revenues increase the owner's Capital (Capital ↑).

Rule Applied: Debit Cash A/c | Credit Commission Received A/c

Transaction	Cash	Furniture	Stock	=	Creditors	+	Capital
Old Equation	60,000	20,000	20,000	=	10,000	+	90,000
Received Comm.	+ 2,000			=		+	+ 2,000 (Rev)
FINAL EQUATION	62,000	20,000	20,000	=	10,000	+	92,000

📊 Final Review: The Master Vertical Table

In exams, you won't write out separate tables. You will combine them all into one continuous statement, exactly like this:

Transactions	ASSETS (₹)			=	LIABILITIES (₹)	+	CAPITAL (₹)
	Cash	Furniture	Stock		Creditors		Capital
1. Started with Cash	+ 1,00,000			=		+	+ 1,00,000
Equation	1,00,000	0	0	=	0	+	1,00,000
2. Furniture for cash	- 20,000	+ 20,000		=
New Equation	80,000	20,000	0	=	0	+	1,00,000
3. Goods on credit			+ 30,000	=	+ 30,000
New Equation	80,000	20,000	30,000	=	30,000	+	1,00,000
4. Sold goods for profit	+ 15,000		- 10,000	=		+	+ 5,000
New Equation	95,000	20,000	20,000	=	30,000	+	1,05,000
5. Paid Rent	- 5,000			=		+	- 5,000
New Equation	90,000	20,000	20,000	=	30,000	+	1,00,000
6. Paid creditor	- 20,000			=	- 20,000
New Equation	70,000	20,000	20,000	=	10,000	+	1,00,000
7. Drawings	- 10,000			=		+	- 10,000
New Equation	60,000	20,000	20,000	=	10,000	+	90,000
8. Received Commission	+ 2,000			=		+	+ 2,000
FINAL EQUATION	62,000	20,000	20,000	=	10,000	+	92,000

✅ Check the Final Balance:
Total Assets (62k + 20k + 20k) = ₹1,02,000
Total Liab. & Cap. (10k + 92k) = ₹1,02,000

Logic Puzzle

The Equation Mastermind

Can you keep the ultimate balance? Test your bookkeeping logic and conquer real-world transactions in this interactive Accounting Equation simulator.

Take the Challenge ➔

⚖️🧠

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