How does the accounting equation always stay balanced after every transaction?
State and apply the accounting equation: assets equal liabilities plus owner's equity
A simple answer to the N(A)-Level Principles of Accounts outcome on the accounting equation. The equation assets equal liabilities plus owner's equity, the dual effect of transactions, and how the equation stays in balance after each one.
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What this dot point is asking
SEAB wants you to state the accounting equation and to apply it to everyday transactions, showing that it always stays in balance. This is the foundation of double entry: every later rule about debits and credits flows from this one equation. The central insight is the dual effect, that every transaction changes at least two items, and always by amounts that keep the two sides of the equation equal.
The answer
The equation
The accounting equation is:
- Assets are what the business owns or is owed (cash, inventory, equipment, money owed by customers).
- Liabilities are what the business owes to others (money owed to suppliers, a bank loan).
- Owner's equity is what the business owes to the owner: the capital put in, plus profit, minus drawings.
It can be rearranged to find any missing part:
Why it always balances
The equation balances because everything the business has (its assets) was funded either by outsiders (liabilities) or by the owner (equity). There is no third source. So the value of the assets must always equal the total of the two ways they were paid for.
The dual effect
Every transaction affects at least two items. Some examples:
| Transaction | Effect 1 | Effect 2 |
|---|---|---|
| Owner pays in cash | Asset (cash) up | Equity (capital) up |
| Buy goods on credit | Asset (inventory) up | Liability (payable) up |
| Buy equipment for cash | Asset (equipment) up | Asset (cash) down |
| Pay a supplier | Asset (bank) down | Liability (payable) down |
Notice that the two effects always keep the equation equal: either both sides move together, or two items on the same side move in opposite directions.
Examples in context
Example 1. Taking out a loan. A sole trader borrows \5,000\ and the loan (a liability) rises by \5,000$. Both sides of the equation grow by the same amount, so it stays balanced. This shows that borrowing does not make the owner richer; it simply adds an asset and an equal liability.
Example 2. Earning a profit. When a business sells goods for more than they cost, assets rise (cash or receivables) and owner's equity rises (through profit) by the same amount. This is why profit appears inside owner's equity: it is the owner's reward for the business's trading, and the equation captures it without ever going out of balance.
Try this
Q1. A business has liabilities of \7,000\. Find total assets. [2 marks]
- Cue. Assets Liabilities Equity = 7\,000 + 15\,000 = \22,000$.
Q2. State the two items that change when a business buys inventory for cash. [2 marks]
- Cue. One asset (inventory) rises and another asset (cash) falls by the same amount; total assets are unchanged.
Q3. Explain why receiving a bank loan does not change owner's equity. [2 marks]
- Cue. A loan increases an asset (bank) and an equal liability (the loan), so the two sides rise together and equity is untouched.
Exam-style practice questions
Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Original5 marksA business has assets of \30\,000\. (a) Calculate the owner's equity. (b) The owner then puts in another \4\,000$ cash. State the new figure for each of the three parts of the equation.Show worked answer →
(a) Owner's equity Assets Liabilities = 30\,000 - 11\,000 = \19,000$.
(b) The owner pays in \4,000\ and capital (owner's equity) rises by \4,000$. Liabilities are unchanged.
- Assets: 30\,000 + 4\,000 = \34,000$.
- Liabilities: \11,000$ (unchanged).
- Owner's equity: 19\,000 + 4\,000 = \23,000$.
Check: . The equation still balances.
What markers reward: the correct opening equity, recognising that paying in cash increases both an asset and equity, and showing that the equation still balances.
Original6 marksFor each transaction, state which two items of the accounting equation change and by how much: (a) buys a computer for \2\,000\ on credit; (c) pays a supplier \800$ by cheque.Show worked answer →
(a) Buy a computer for cash: one asset (computer) rises by \2,000\. Total assets are unchanged, so the equation still balances.
(b) Buy goods on credit: an asset (inventory) rises by \1,500\. Assets up and liabilities up by the same amount.
(c) Pay a supplier by cheque: an asset (bank) falls by \800\. Assets down and liabilities down by the same amount.
What markers reward: naming the two items affected in each case, the correct direction (up or down) and amount, and showing that each transaction keeps the equation balanced.
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