The balance-sheet identity showing that assets equal liabilities plus equity, with transaction examples and analytical limits.
The accounting equation is the balance-sheet identity stating that an entity’s assets equal its liabilities plus equity. It expresses how resources are financed: creditors have claims represented by liabilities, and owners hold the residual claim represented by equity.
| Component | Plain-English meaning | Common examples |
|---|---|---|
| Assets | Present economic resources controlled by the entity as a result of past events | Cash, receivables, inventory, equipment |
| Liabilities | Present obligations to transfer economic resources as a result of past events | Accounts payable, debt, accrued expenses |
| Equity | Residual interest in assets after deducting liabilities | Share capital, retained earnings, accumulated OCI |
Rearranging the equation makes the residual nature of equity explicit:
This does not mean shareholders can withdraw the reported equity amount. Many assets are illiquid, restricted, measured using accounting estimates, or needed to operate the business. Legal capital and distribution rules also differ from accounting equity.
For a simple corporation, equity can be expanded to show how owner transactions and performance change it:
Profit itself reflects recognized income less recognized expenses. The expanded equation therefore connects the balance sheet with the income statement and the Statement of Changes in Equity.
Assume a new company begins with no balances and completes these transactions:
| Transaction | Change in assets | Change in liabilities | Change in equity | Equation after transaction |
|---|---|---|---|---|
| Owner contributes $50,000 cash | +$50,000 | - | +$50,000 | $50,000 = $0 + $50,000 |
| Buy $12,000 equipment for cash | $0 total: cash -$12,000, equipment +$12,000 | - | - | $50,000 = $0 + $50,000 |
| Buy $8,000 inventory on credit | +$8,000 | +$8,000 | - | $58,000 = $8,000 + $50,000 |
| Sell inventory for $5,000 cash that cost $3,000 | +$2,000 net | - | +$2,000 profit | $60,000 = $8,000 + $52,000 |
| Pay $4,000 to the supplier | -$4,000 | -$4,000 | - | $56,000 = $4,000 + $52,000 |
| Pay a $1,000 dividend | -$1,000 | - | -$1,000 | $55,000 = $4,000 + $51,000 |
The equipment purchase changes the composition of assets but not total assets. The credit purchase increases both an asset and a liability. The sale increases equity by the $2,000 profit, not by the $5,000 cash receipt, because $3,000 of inventory was consumed. Paying the supplier reduces cash and the payable without changing equity. The dividend reduces cash and equity but is not an expense.
Double-entry bookkeeping records equal total debits and credits. The normal balances follow the equation’s structure:
| Account class | Normal increase |
|---|---|
| Assets | Debit |
| Liabilities | Credit |
| Equity | Credit |
| Revenue and gains | Credit, increasing profit and equity |
| Expenses and losses | Debit, reducing profit and equity |
| Owner distributions | Debit, reducing equity directly |
For the $8,000 inventory purchase on credit:
1Dr Inventory $8,000
2 Cr Accounts Payable $8,000
The debit increases assets and the credit increases liabilities by the same amount. The accounting equation remains balanced.
The equation is useful for:
It is especially helpful for beginners who otherwise confuse cash receipts with revenue, cash payments with expenses, or debt proceeds with profit.
A set of books can balance and still be wrong. Equal debits and credits will not detect every error, including:
The equation also does not measure liquidity, solvency, earnings quality, or market value. A company can have positive equity but insufficient cash, or negative accounting equity while still having valuable operations and access to financing.
The accounting equation is a structural identity, not a complete recognition or valuation rule. This page is educational and does not provide accounting, audit, legal, valuation, or investment advice.