The double entry model

Welcome to the Heart of Accounting: The Double Entry Model

Hello there! You are about to dive into the most important chapter in your AS Accounting journey. The double entry model is the foundation of everything accountants do. Think of it as the "DNA" of financial records. Once you master this, everything else—from reading a balance sheet to managing a multi-million dollar company—starts to make sense.

Don't worry if it seems a bit like learning a new language at first. We will break it down step-by-step, using simple tricks to help you remember the rules!

1. The Core Idea: Duality

The entire system is based on the duality concept. This simply means that every single transaction has two sides. If you spend money to buy a new delivery van, two things happen: you have less cash, but you have more assets (the van).

The Accounting Equation

Everything in the double entry system must keep this equation in balance:

\( \text{Assets} = \text{Capital} + \text{Liabilities} \)

The Golden Rule: DEBITS and CREDITS

Every transaction is recorded in a "T-Account." The Left side is always the Debit (Dr) side, and the Right side is always the Credit (Cr) side.

The Memory Trick: DEAD CLIC
Use this mnemonic to remember which side to increase an account on:
DEAD (Debit: Expenses, Assets, Drawings)
CLIC (Credit: Liabilities, Income, Capital)

Example: If you buy a computer (an Asset), you Debit the Computer Account. If you pay for it with a Bank Loan (a Liability), you Credit the Loan Account.

Key Takeaway

For every Debit entry, there must be an equal Credit entry. If they don't match, something has gone wrong!

2. Where it Starts: Source Documents

Accountants don't just make up numbers; they need proof! These proofs are called source documents.

Common Source Documents you need to know:
• Sales Invoice: Sent to a customer when they buy on credit.
• Purchase Invoice: Received from a supplier when we buy on credit.
• Credit Note: Sent or received when goods are returned.
• Cheque Counterfoil: A record of a payment made by cheque.
• Till Roll/Cash Receipt: Proof of a cash sale.
• Bank Statement: Used to record items like Direct Debits, Standing Orders, and Bank Charges.

Did you know? A Paying-in slip counterfoil is what you get from the bank when you deposit cash or cheques into the business account. It's your "receipt" for putting money in!

3. The Waiting Room: Books of Prime Entry

Recording every tiny receipt directly into the main ledgers would be messy. Instead, we list them first in Books of Prime Entry.

• Sales Journal: For credit sales only.
• Purchases Journal: For credit purchases only.
• Sales Returns Journal: When credit customers return goods to us.
• Purchases Returns Journal: When we return goods to our credit suppliers.
• General Journal: For unusual transactions like buying a "non-current asset" (like a car) on credit, or correcting errors.
• Three-Column Cash Book: This is special because it acts as both a book of prime entry and a ledger account. It has columns for Cash, Bank, and Discounts.

Quick Review: The Two Types of Discounts

1. Trade Discount: A reduction in price given at the time of purchase (e.g., a bulk buy discount). Crucial: We do not record this in the ledger accounts! We only record the final price.
2. Cash Discount: A reward for paying an invoice early. This is recorded in the Discounts Allowed or Discounts Received columns of the cash book.

4. The Ledgers: Organizing the Info

Once transactions are in the journals, they are posted to the Ledgers. Think of ledgers as folders that group similar information together.

• Receivables Ledger: Accounts for individual customers who owe us money.
• Payables Ledger: Accounts for individual suppliers we owe money to.
• General Ledger: All other accounts (Rent, Machinery, Capital, Sales, etc.).

5. Capital vs. Revenue: Don't Mix Them Up!

This is a favorite exam topic! You must distinguish between Capital and Revenue items.

Capital Expenditure: Spending money to buy or improve Non-Current Assets (e.g., buying a van or building an extension). This appears on the Statement of Financial Position.
Revenue Expenditure: Spending money on day-to-day running costs (e.g., van fuel or repairing a window). This appears in the Income Statement.

Common Mistake: Students often record "Van Repairs" as a Capital expense. Remember: if it just fixes the asset back to its original state, it's Revenue. If it makes the asset better or last longer, it's Capital!

6. Adjustments: Getting the Timing Right

At the end of the year, we must make adjustments to ensure our profit is accurate.

Depreciation

Assets like machinery lose value over time. We record this as an expense.
• Straight Line Method: The asset loses the same amount of value every year.
\( \text{Annual Depreciation} = \frac{\text{Cost} - \text{Residual Value}}{\text{Useful Life}} \)
• Reducing Balance Method: A fixed percentage is taken from the current value (Net Book Value) each year.
\( \text{Depreciation} = \text{Net Book Value} \times \% \)

Irrecoverable Debts and Provisions

Sometimes customers can't pay us. We must write these off as Irrecoverable Debts (an expense). We also create a Provision for Doubtful Debts if we think some customers might not pay in the future (Prudence concept).

Accruals and Prepayments

• Other Payables (Accruals): Expenses we have used but haven't paid for yet (e.g., unpaid electricity).
• Other Receivables (Prepayments): Expenses we have paid for in advance (e.g., paying next year's insurance early).

Key Takeaway

Adjustments ensure that the financial statements show a "true and fair" view of the business performance.

7. The Final Goal: Financial Statements

All your hard work in the double entry system leads to two main reports:

The Income Statement

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

The Statement of Financial Position (SOFP)

This shows what the business is "worth" on a specific date. It is divided into subheadings:
• Non-Current Assets: Long-term items (Property, Equipment).
• Current Assets: Items used/turned to cash within a year (Inventory, Trade Receivables, Bank).
• Equity: The owner's investment (Capital + Profit - Drawings).
• Non-Current Liabilities: Debts paid back after one year (Bank Loans).
• Current Liabilities: Debts to be paid within a year (Trade Payables, Bank Overdraft).

Quick Review Box: The Balancing Act
In your SOFP, your Total Assets must always equal your Total Equity + Total Liabilities. If they do, take a deep breath—you've done it!

Final Encouragement

Double entry might feel like solving a puzzle with a thousand pieces. Start with the "DEAD CLIC" rule, and always ask yourself: "Which two things are changing in this transaction?" You've got this!