Principles of Double Entry Bookkeeping

📘 PRINCIPLES OF DOUBLE ENTRY BOOKKEEPING

Double entry bookkeeping is the foundation of modern accounting.
It is based on one core truth:

👉 Every transaction has two sides — a debit and a credit.
If you receive something, you must give out something.

This system ensures that the accounting equation always stays balanced:

Assets = Liabilities + Capital

1️⃣ Meaning of Double Entry

Double entry bookkeeping means recording every financial transaction in two opposite accounts, one as debit (Dr) and the other as credit (Cr).

Examples:

• When you buy goods with cash →
  Purchase account (Dr), Cash account (Cr)

• When a customer pays you →
  Cash (Dr), Debtors (Cr)

The system ensures accuracy, checks errors, and keeps the ledger balanced.

2️⃣ THE PRINCIPLE ITSELF

📍 Principle:

For every debit entry, there must be a corresponding credit entry, and vice-versa.

Or simply:

👉 DEBIT the receiver.
👉 CREDIT the giver.

For goods/services:
👉 DEBIT what comes in.
👉 CREDIT what goes out.

3️⃣ Debit and Credit Explained

Debit (Dr):

• Assets increasing

• Expenses increasing

• Customer owing us (Debtors) increasing

Credit (Cr):

• Liabilities increasing

• Income increasing

• Capital increasing

• What we owe others (Creditors) increasing

4️⃣ Types of Accounts in Double Entry

There are three major account types:

1. Personal Accounts

Deals with individuals, firms, or organizations.
Rule: Debit the receiver, Credit the giver.

2. Real Accounts

Deals with assets (tangible or intangible).
Rule: Debit what comes in, Credit what goes out.

3. Nominal Accounts

Deals with expenses, incomes, gains, and losses.
Rule: Debit all expenses & losses, Credit all incomes & gains.

5️⃣ Why Double Entry is Important

• Ensures accuracy and completeness

• Helps detect errors

• Produces reliable financial statements

• Keeps the accounting equation balanced

• Helps track fraud

• Provides a full record of every transaction

6️⃣ Simple Examples (WAEC Style)

Example 1: Owner brings ₦50,000 into the business

• Cash (Dr)

• Capital (Cr)

Example 2: Bought furniture for ₦20,000 cash

• Furniture (Dr)

• Cash (Cr)

Example 3: Paid electricity bill ₦5,000

• Electricity Expense (Dr)

• Cash/Bank (Cr)

Example 4: Received ₦10,000 from customer

• Cash (Dr)

• Debtors (Cr)

7️⃣ Trial Balance Link

Because double entry always balances, the Trial Balance can be prepared.
If the trial balance doesn’t balance, something is wrong in the entries.

Possible JAMB/WAEC Questions

1. State the principle of double entry.

2. Explain the rule of personal, real, and nominal accounts.

3. Give two examples each of debit and credit transactions.

4. Why is the double entry system important?