The Accounting Equation
Assets = Liabilities + Shareholders' Equity
The fundamental equation underlying all of accounting. Every transaction must keep this equation in balance. This equation shows how a company's resources (assets) are financed - either through debt (liabilities) or owner investment and retained earnings (equity).
Variables
Resources owned by the company that have future economic value
Obligations the company owes to external parties
The residual interest in assets after deducting liabilities
Example Calculation
Scenario
A company has $500,000 in assets and $200,000 in liabilities. Calculate shareholders' equity.
Given Data
Calculation
SE = A - L = $500,000 - $200,000
Result
$300,000
Interpretation
The company has $300,000 in shareholders' equity, representing the owners' stake in the company after all debts are paid.
When to Use This Formula
- ✓Verifying that journal entries balance
- ✓Understanding how transactions affect the balance sheet
- ✓Analyzing a company's capital structure
- ✓Checking the accuracy of financial statements
Common Mistakes
- ✗Forgetting that equity includes both contributed capital and retained earnings
- ✗Not recognizing that the equation must always balance
- ✗Confusing liabilities with expenses
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Common questions about this formula
The accounting equation must always balance because of double-entry bookkeeping. Every transaction affects at least two accounts in a way that keeps the equation in balance. If assets increase, either liabilities or equity must increase by the same amount, or another asset must decrease.
When revenue is earned, assets typically increase (cash or accounts receivable) and equity increases through retained earnings. The equation stays balanced because both sides increase by the same amount.