Welcome to the Rules of the Game!

Ever wondered why all businesses around the world seem to follow the same patterns when they record their accounts? It’s because they follow a set of "ground rules" known as Accounting Concepts. These are the foundation of everything you will do in your Oxford AQA International AS Level Accounting course.

Think of these concepts like the rules of a sport. Without them, every business would play by their own rules, and it would be impossible to compare how one shop is doing against another. In this guide, we’ll break down these 10 essential concepts into simple, everyday ideas. Don't worry if some feel a bit "theoretical" at first—we'll use plenty of examples to bring them to life!


1. The Ten Pillars of Accounting

According to your syllabus (3.1.5), there are ten specific concepts you need to master. Let’s look at them one by one.

Business Entity

This is the most important rule to start with: The business is separate from the person who owns it. Even if you are a sole trader running a small lemonade stand, in the world of accounting, you and the lemonade stand are two different things.

Example: If the owner buys a personal laptop for their daughter using their own money, it does not go into the business accounts. If the owner takes cash out of the business to pay for a personal holiday, we record this as Drawings to show money leaving the business entity.

Money Measurement

Accounting only cares about things that can be measured in monetary terms (dollars, pounds, etc.). If you can't put a price tag on it, it doesn't go in the books.

Example: A business might have the most hardworking, loyal staff in the world. While this is great for the business, "staff loyalty" cannot be measured in money, so it is not recorded as an asset on the Statement of Financial Position.

Duality (Double Entry)

Every single transaction has two sides. This is the heart of the double-entry system. For every "Debit," there must be a "Credit."

Analogy: Think of a coin. You can’t have a "heads" side without a "tails" side. If you buy a van for cash, the business gains a Non-current Asset (the van) but loses Current Assets (the cash). Two things happened!

Historic Cost

Assets are usually recorded at the price you originally paid for them (the cost), rather than what they might be worth today.

Example: If a business bought a piece of land in 1990 for \$50,000, it stays in the accounts at \$50,000, even if it is worth \$1,000,000 today. This keeps the accounts objective and based on facts (the receipt), not guesses.

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Going Concern

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We prepare accounts assuming the business will keep running for the foreseeable future. We don't plan on closing down tomorrow.

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Why it matters: Because we assume the business will continue, we can record "Non-current Assets" (like machinery) and spread their cost over many years (depreciation) rather than showing their "fire-sale" value if the business closed today.

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Accruals (Matching)

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Revenue and expenses are recorded when they happen, not necessarily when the cash moves. We "match" the expenses of a period to the income earned in that same period.

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Example: If you receive an electricity bill in December but don't pay it until January, the expense must be recorded in the December accounts because that’s when the electricity was used.

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Consistency

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Once a business chooses an accounting method, it should stick with it year after year. This allows us to compare this year's profit to last year's profit fairly.

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Example: If you use the "Straight Line" method for depreciation this year, you should use it next year too. You shouldn't switch to "Reducing Balance" just to make your profit look better!

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Prudence

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This is the "play it safe" rule. Accountants should be cautious. We never overstate our profits or assets, and we always record potential losses as soon as they are likely.

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Motto: Anticipate no profit, but provide for all possible losses.

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Materiality

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Only "material" (significant) items need to be recorded strictly according to every accounting rule. If an item is so small that it wouldn't change a manager's decision, we can treat it simply.

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Example: A \$2 stapler will last 5 years, making it technically a "non-current asset." However, calculating depreciation on a \$2 stapler is a waste of time. Because it is immaterial, we just record it as an expense.

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Realisation

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Profit is only "realised" (officially earned) when the legal ownership of goods passes to the customer, or a service is completed—not just when someone places an order.

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Example: If a customer orders a cake on Monday but you deliver it on Friday, the sale is realised on Friday.

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Quick Review: The "BIG 10" Mnemonic
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To remember these, try this phrase: Big Money Dreams Have Great Accounts, Consistently Producing More Revenue.

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(Business Entity, Money Measurement, Duality, Historic Cost, Going Concern, Accruals, Consistency, Prudence, Materiality, Realisation)

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2. Applying Concepts in Real Situations

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The syllabus (3.1.5) requires you to know how these concepts apply to specific accounting tasks. Let’s look at the most common ones:

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Asset Valuation and Depreciation

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When we value assets, we use Historic Cost. However, because of Accruals, we don't just record the whole cost as an expense at once. Instead, we use Depreciation to spread the cost over the years the asset is used. This "matches" the cost of the asset against the income it helps generate.

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Inventory Valuation (The "Lower of Cost or NRV" Rule)

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This is a classic application of Prudence. Inventory (stock) should be valued at whichever is lower:\n
1. Cost: What you paid for it.\n
2. Net Realisable Value (NRV): What you can sell it for minus any costs to finish or sell it.

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Example: You bought a shirt for \$10 (Cost). It got damaged, and you can only sell it for \$7 (NRV). You must value it at \$7 in your accounts to be Prudent.

Goods Sold on "Sale or Return" Basis

If you send goods to a shop where they only pay you if they sell the items (and can return them if they don't), you cannot record a sale yet. This follows the Realisation concept. The profit is only yours once the shop actually sells those goods to a final customer.

Other Payables and Receivables (Accruals/Prepayments)

Adjusting for expenses you owe (Accruals) or income you've earned but haven't received (Other Receivables) is a direct application of the Accruals/Matching concept. It ensures the Income Statement shows the "true" performance for that specific year.


3. Common Mistakes to Avoid

Mistake 1: Mixing Personal and Business Cash
Correction: Always remember the Business Entity concept. If the owner uses the business debit card for a grocery shop, it’s not a "General Expense"—it's "Drawings."

Mistake 2: Counting a "Potential" Sale
Correction: Under the Realisation concept, you can't record profit just because a customer said, "I'll probably buy that next month." Wait until the transaction actually happens!

Mistake 3: Changing Depreciation Methods to "Hide" a Loss
Correction: This violates the Consistency concept. You must use the same methods unless there is a very significant reason to change (and if you do, you must explain it in the notes to the accounts).


Summary Key Takeaways

• Concepts are the rules that make accounting information reliable and comparable.
• Prudence means being cautious—never overstating profit or assets.
• Accruals means matching expenses and income to the period they relate to, regardless of cash flow.
• Business Entity keeps the owner's pockets separate from the business's bank account.
• Historic Cost keeps values objective by using original purchase prices.
• Going Concern allows us to record assets as long-term investments rather than immediate losses.

Don't worry if these feel like a lot of definitions! As you start preparing Financial Statements in the next chapters, you'll see these concepts in action every single time. They will soon become second nature!