The accounting equation explained (with a simple example)

Almost everything in IGCSE Accounting grows out of one idea: the accounting equation. Once you understand it, topics like double entry, the statement of financial position and adjustments stop feeling like separate rules. They become one system. Students who only memorise procedures get stuck when a question is worded unusually. Students who own the equation can reason their way through.

The equation

Assets = Capital + Liabilities

In words: everything the business owns (its assets) was paid for either by the owner (capital) or by others the business owes (liabilities). There is no third source, so the two sides are always equal.

Every resource in the business arrived because someone provided it, either the owner or an outside party. So the balance is not a lucky coincidence to check at the end. It is built in from the first entry.

What each part means

• Assets: resources the business controls that are expected to bring future benefit. Examples are cash, inventory, equipment, motor vehicles, premises, and money owed by customers (trade receivables).
• Capital: what the owner has put in, plus profits kept in the business, less drawings. Think of capital as the amount the business owes back to its owner. That is why it sits on the same side as liabilities.
• Liabilities: what the business owes to others, such as bank loans and amounts owed to suppliers (trade payables). If it must eventually be paid to someone outside the business, it is a liability.

Why it always balances

Every transaction keeps the equation equal. Take a new business:

1. The owner pays in RM20,000. Assets (cash) +20,000, capital +20,000. Balanced.
2. The business buys equipment for RM5,000 cash. One asset (equipment) +5,000, another asset (cash) -5,000. Total assets are unchanged. Balanced.
3. The business takes a RM10,000 loan. Assets (cash) +10,000, liabilities (loan) +10,000. Balanced.

Each step keeps both sides equal. That is double entry in action, and it is why a trial balance should agree. A transaction can only do two things to the equation.

It can move value within one side, as in step 2. Or it can raise both sides by the same amount, as in steps 1 and 3. Neither unbalances it, and there is no third option.

That is why double entry works.

A worked example

Aina starts a small stationery business. The figures are invented to show the method.

She pays RM30,000 of her own money into the business bank account. Assets are RM30,000 (cash).

Capital is RM30,000. Liabilities are RM0.

She buys shelving and a counter for RM8,000 by cheque. Cash falls by RM8,000 and equipment rises by RM8,000, so total assets stay at RM30,000.

She buys inventory of RM6,000 on credit. Inventory (an asset) rises by RM6,000 and trade payables (a liability) rise by RM6,000.

Assets are now RM36,000 (cash RM22,000 + equipment RM8,000 + inventory RM6,000). The other side is capital RM30,000 + liabilities RM6,000 = RM36,000.

She sells goods that cost RM2,000 for RM3,500 cash. Cash rises by RM3,500 and inventory falls by RM2,000. The RM1,500 difference is profit, which belongs to the owner, so capital rises by RM1,500.

Both sides still agree. The habit matters more than the arithmetic: after any transaction, you should be able to say in one sentence which items moved and why the equation still holds.

A common confusion: capital is not cash

Because many businesses start with the owner paying in cash, beginners assume capital is the cash in the bank. It is not.

Capital is the owner’s stake in the whole business. Cash is one asset among several.

In Aina’s example, her capital grew to RM31,500 after the sale, but her cash was RM25,500. The numbers differ because value is tied up in equipment and inventory. Keeping these apart prevents mistakes later, when you meet drawings, profit, and the difference between a business making money and a business having money in the bank.

How drawings and profit fit in

Capital does not stay fixed once the business opens. Profit increases it, because profit is value the business has generated for its owner. Drawings decrease it, because drawings are resources the owner takes out for personal use, such as cash or goods taken home.

So the capital side is opening capital, plus profit, less drawings. This is why two businesses with the same profit can end with different closing capital. The one whose owner withdrew more is left with less.

From equation to statement

The statement of financial position is the accounting equation written out neatly at one date. Assets are on one side, capital and liabilities on the other, and the totals are equal.

The vertical layout you will practise rearranges it into assets less liabilities equals capital. The relationship does not change. When a statement does not balance, the equation tells you where to look: an item added on the wrong side, counted twice, or left out.

Build it into your instincts

Whenever you record a transaction, ask what happened to assets, to capital and to liabilities. If your entries keep the equation balanced, you are almost certainly right. Use it as a running check, not only at the end of a question.

Practise with the double-entry trainer. See Year 9 foundation if your child is starting from the beginning.

If the equation still feels abstract, one of our teachers can work through your child’s own examples live. They will stop wherever the reasoning breaks down and rebuild it step by step. Book a trial class

Syllabus reference: Cambridge 0452 and 0985, syllabus for 2027 to 2029, sub-topic 1.2 The accounting equation (page 11).