The double entry model

Welcome to the Heart of Accounting: The Double Entry Model

Welcome! If you are reading this, you are about to master the most important tool in an accountant's toolkit: Double Entry Bookkeeping. Think of double entry as the "language" of business. Once you understand the basic rules, everything else in accounting starts to click into place. Don't worry if it seems a bit like a puzzle at first—we will break it down step-by-step!

1. The Golden Rule: Duality

In accounting, every single transaction has two effects. If you spend cash to buy a delivery van, you have less cash (one effect) but more assets (the second effect). This is the Duality Concept. To record these two effects, we use Debits (Dr) and Credits (Cr).

The Memory Trick: DEAD CLIC

Struggling to remember what is a Debit and what is a Credit? Just remember DEAD CLIC!

DEAD (These items increase with a Debit):
• Debit
• Expenses (e.g., rent, electricity)
• Assets (e.g., machinery, cash, bank)
• Drawings (money taken by the owner for personal use)

CLIC (These items increase with a Credit):
• Credit
• Liabilities (e.g., bank loans, money owed to suppliers)
• Income (e.g., sales revenue, commission received)
• Capital (the owner’s investment in the business)

Quick Review: If an Asset increases, you Debit it. If a Liability increases, you Credit it. If they decrease, you do the exact opposite!

2. Where it Starts: Source Documents

Before an accountant writes anything down, they need proof that a transaction happened. This proof is called a Source Document.

• Sales Invoice: Sent to a customer when they buy on credit.
• Purchase Invoice: Received from a supplier when we buy on credit.
• Credit Note: Issued when goods are returned (think of it as a "negative invoice").
• Cheque Counterfoil / Bank Statement: Evidence of payments made or received via the bank.
• Till Rolls / Cash Receipts: Evidence of cash sales.

Did you know? An accountant oversees the work of bookkeepers and ledger clerks, who are usually the ones processing these documents daily!

3. The Waiting Room: Books of Prime Entry

We don't go straight to the main accounts. First, we list transactions in Books of Prime Entry (also called Journals). Think of these as a "diary" of daily business events.

1. Sales Journal: Records credit sales.
2. Purchases Journal: Records credit purchases.
3. Sales Returns Journal: Records goods sent back by customers.
4. Purchases Returns Journal: Records goods we sent back to suppliers.
5. General Journal: For unusual things, like buying a fixed asset or correcting errors.
6. Cash Book: A special book that acts as both a book of prime entry and a ledger account for Cash and Bank transactions.

The Three-Column Cash Book

This records Cash, Bank, and Discounts.
• Discount Allowed: Given to customers (an expense - Debit side).
• Discount Received: Given by suppliers (an income - Credit side).

4. The Main Records: Ledger Accounts

From the journals, we move information into Ledgers. To stay organized, businesses divide their ledgers into three types:
• Receivables Ledger: Individual accounts for every customer who owes us money.
• Payables Ledger: Individual accounts for every supplier we owe money to.
• General Ledger: All other accounts (Rent, Machinery, Sales, Capital, etc.).

How to Balance an Account

At the end of the month, we need to find out the "balance." Follow these steps:
1. Add up both sides (Debit and Credit).
2. Find the difference between the two totals.
3. Put that difference on the smaller side and label it Balance c/d (carried down).
4. Total both sides again (they should match now!).
5. Bring the balance down to the opposite side for the next month as Balance b/d (brought down).

Common Mistake: Many students forget to bring the balance down (b/d). The Balance b/d is the most important part because it tells you the actual value of the account today!

5. Capital vs. Revenue: What’s the Difference?

This is a classic exam topic. You must distinguish between "one-off" big costs and "day-to-day" running costs.

Capital Expenditure: Money spent on buying or improving Non-Current Assets (like buying a building or adding a new engine to a van). These appear in the Statement of Financial Position.
Revenue Expenditure: Money spent on day-to-day running costs (like electricity, repairs, or petrol). These appear in the Income Statement.

Analogy: Buying a PlayStation is Capital Expenditure (it's a long-term asset). Buying the monthly subscription to play online is Revenue Expenditure (it's an ongoing expense to keep it running).

6. Year-End Adjustments

Before we finish the final accounts, we need to make sure the numbers are "fair" and accurate. We use several adjustments:

Depreciation

Assets like cars and computers lose value over time. We record this as an expense.
1. Straight Line Method: The asset loses the same amount every year.
\( \text{Annual Depreciation} = \frac{\text{Cost} - \text{Residual Value}}{\text{Useful Life}} \)
2. Reducing Balance Method: A fixed percentage is taken from the current book value each year. It's higher in the early years.

Irrecoverable Debts and Provisions

Sometimes customers can't pay us back. We write this off as an Irrecoverable Debt (Debit: Irrecoverable Debts, Credit: Customer). We also create a Provision for Doubtful Debts if we think some people might not pay in the future, following the Prudence Concept (being cautious).

Accruals and Prepayments

• Other Payables (Accruals): Expenses we have used but haven't paid for yet (e.g., electricity used in December but bill arrives in January).
• Other Receivables (Prepayments): Expenses we paid for in advance (e.g., paying for 6 months of insurance at once).

7. The Final Goal: Financial Statements

After all the double entries are done and the accounts are balanced, we prepare two main reports:

1. The Income Statement

This calculates if the business made a Profit or a Loss.
Formula: \( \text{Revenue} - \text{Cost of Sales} = \text{Gross Profit} \)
\( \text{Gross Profit} + \text{Other Income} - \text{Expenses} = \text{Profit for the Year} \)

2. The Statement of Financial Position (SFP)

This shows what the business owns and owes at a specific date. It must follow the Accounting Equation:
\( \text{Assets} = \text{Capital (Equity)} + \text{Liabilities} \)

SFP Subheadings you must use:
• Non-Current Assets: Long-term items (Property, Machinery).
• Current Assets: Short-term items (Inventory, Receivables, Bank).
• Equity: The owner's share (Capital + Profit - Drawings).
• Non-Current Liabilities: Long-term debts (Bank Loans over 1 year).
• Current Liabilities: Short-term debts (Trade Payables, Overdrafts).

Summary Takeaway

Double Entry is all about balance. Every Debit must have a corresponding Credit. By using Source Documents to fill Books of Prime Entry, posting to Ledgers, and making Year-End Adjustments, you can create accurate Financial Statements that show the true health of a business. Keep practicing the DEAD CLIC rule—it's the foundation of everything!