The accounting equation Cambridge IGCSE Accounting revision

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In plain words

Everything a business has was paid for by somebody: either the owner, or someone the business still owes. That simple idea is the accounting equation, and all of double entry grows out of it.

6 things to know

  1. Assets are things owned by the business, or owed to it: premises, equipment, inventory, trade receivables, money in the bank.
  2. Liabilities are amounts the business owes to others: trade payables, loans, a bank overdraft.
  3. Owner's equity (capital) is what the business owes to its owner: the money the owner put in, plus profits, less drawings.
  4. The accounting equation: assets = owner's equity + liabilities. Rearranged: owner's equity = assets − liabilities.
  5. Every transaction changes two things, and the equation still balances afterwards.
  6. Profit increases owner's equity. A loss and drawings reduce it.

Worked example

A business has assets of $54 000 and liabilities of $16 500. Find the owner's equity. It then buys equipment for $3000 on credit. Show that the equation still balances.

  1. Owner's equity = assets − liabilities = 54 000 − 16 500 = $37 500.
  2. Buying equipment adds an asset: assets become $57 000.
  3. It was bought on credit, so a liability is added too: liabilities become $19 500.
  4. 57 000 = 37 500 + 19 500. It balances, and the owner's equity has not changed.

Tips and tricks

  • Think about each transaction as two changes. If only one side of the equation has moved, you have missed one.
  • Buying an asset on credit does not change owner's equity. Only profit, loss, new capital and drawings do.
6 questions, about 2 minutes.

It lands in your notebook with its questions as flashcards.

The accounting equation: 6 questions and answers

These are the quiz’s questions. Do the quiz first, then come back here for the ones that got you.

  1. Which is the accounting equation?
    • assets = liabilities − owner's equity
    • assets = owner's equity + liabilities (the answer)
    • owner's equity = assets + liabilities
    • liabilities = assets + owner's equity

    What the business has equals what was provided by the owner and by others.

  2. Assets are $70 000 and liabilities are $25 000. What is the owner's equity?
    • $25 000
    • $45 000 (the answer)
    • $70 000
    • $95 000

    70 000 − 25 000.

  3. Which of these is a liability?
    • inventory
    • trade receivables
    • a bank overdraft (the answer)
    • equipment

    The business owes the bank that money.

  4. Which of these is an asset?
    • trade payables
    • a bank loan
    • capital
    • trade receivables (the answer)

    Customers owe that money to the business.

  5. A business buys a van for $9000, paying from its bank account. What happens to total assets?
    • They rise by $9000.
    • They fall by $9000.
    • They do not change. (the answer)
    • They rise by $18 000.

    One asset (the van) goes up and another (bank) goes down by the same amount.

  6. A business makes a profit of $6000 in a year, and the owner takes drawings of $4500. By how much does owner's equity change?Stretch
    • it rises by $10 500
    • it rises by $6000
    • it rises by $1500 (the answer)
    • it falls by $4500

    Profit adds 6000 and drawings take away 4500.

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