Quick answer
The accounting equation says that a business’s assets are financed by liabilities and equity. Every recognized transaction must leave the relationship in balance: Assets = Liabilities + Equity.
The equation provides a point-in-time view of the business. It shows the resources recognized in its accounts and the claims against those resources—not the owner’s personal property or the business’s market value.
Assets equals Liabilities plus Equity.
What each part means
- Assets
- Resources controlled by the business that can help produce economic benefits. Cash, receivables, supplies, inventory, and equipment are common examples.
- Liabilities
- Present obligations to transfer an economic resource. Accounts payable, wages payable, and loans are common examples.
- Equity
- The residual interest after liabilities are deducted from assets. In a corporation it can include share capital, retained earnings, and other components. It is not simply the cash balance.
Why the equation balances
Every resource has a financing source. If a bank lends the business $20,000, cash and a liability increase together. If an owner contributes $20,000 for shares, cash and equity increase together. A transaction can also change the mix within one side: buying equipment for cash decreases one asset and increases another, leaving total assets unchanged.
Revenue and expenses reach the equation through equity. Revenue from business performance increases equity; expenses reduce it. Owner contributions and distributions also change equity, but they are separate from revenue and expenses.
Transaction by transaction
Maple Tech’s first month
Follow five transactions. Each row shows the change caused by that transaction and the balanced totals after it.
| Transaction | Change in assets | Change in liabilities | Change in equity | Ending equation |
|---|---|---|---|---|
| Issued common shares for $50,000 cash | +$50,000 | No change | +$50,000 | $50,000 = $0 + $50,000 |
| Equipment purchased for $12,000 cash | Cash −$12,000; equipment +$12,000 | No change | No change | $50,000 = $0 + $50,000 |
| Supplies purchased on account for $2,400 | +$2,400 | +$2,400 | No change | $52,400 = $2,400 + $50,000 |
| Services completed for $6,000 cash | +$6,000 | No change | +$6,000 through revenue | $58,400 = $2,400 + $56,000 |
| Rent of $1,500 paid in cash | −$1,500 | No change | −$1,500 through expense | $56,900 = $2,400 + $54,500 |
Immediately after the fifth entry, Maple Tech has $56,900 of assets, $2,400 of liabilities, and $54,500 of equity. These amounts are still before period-end adjustments. The $4,500 difference between recorded revenue and rent is not yet Maple Tech’s final March profit.
Buying supplies on account
| Statement | Account | Effect | Timing |
|---|---|---|---|
| Balance sheet | Supplies | Assets increase by $2,400 | When the supplies are received and recognized |
| Balance sheet | Accounts Payable | Liabilities increase by $2,400 | At the same time |
| Income statement | Expense | No immediate effect while the supplies remain unused | Expense is recognized as the supplies are consumed |
Amounts are simplified and exclude tax, depreciation, and other period-end adjustments so the equation effects remain visible.
From the equation to an entry
The founder’s contribution has two measurable effects: Cash increases and Common Shares increases. The journal entry records those two effects. Continue to Debits, Credits, and Double-Entry Bookkeeping for the full debit-and-credit reasoning.
| Account | Debit | Credit |
|---|---|---|
| Cash | 50,000 | |
| Common Shares | 50,000 |
Cash is an asset and increases. Common Shares records the owner contribution in equity. The contribution is not revenue because it comes from an owner acting as an owner.
Period-end facts complete the equation
The earlier transaction view stopped before period-end review. Three new facts update both the recorded resources and equity through March profit:
- Using $1,500 of supplies reduces the Supplies asset and reduces equity through Supplies Expense.
- Earning $1,000 before billing increases Accounts Receivable and increases equity through Service Revenue.
- Allocating $200 of equipment cost increases Accumulated Depreciation, reducing net assets and equity through Depreciation Expense.
Together, the adjustments reduce both assets and equity by a net $700. The equation moves from $56,900 = $2,400 + $54,500 to $56,200 = $2,400 + $53,800. The balance sheet, also called a statement of financial position, presents that adjusted equation in report form. The later Adjusting Entries page teaches how those three facts are recorded.
| Line item | 2026 |
|---|---|
| Assets | |
| Cash | 42,500 |
| Accounts Receivable | 1,000 |
| Supplies | 900 |
| Equipment, at cost | 12,000 |
| Less: Accumulated Depreciation | (200) |
| Equipment, net | 11,800 |
| Total Assets | 56,200 |
| Liabilities | |
| Accounts payable | 2,400 |
| Total Liabilities | 2,400 |
| Shareholders’ Equity | |
| Common shares | 50,000 |
| Retained earnings | 3,800 |
| Total Equity | 53,800 |
| Total Liabilities and Equity | 56,200 |
What balance does not prove
- A balanced equation can still contain errors. The wrong accounts, amount, or reporting period can be used on both sides.
- Equity is not available cash. It is a residual claim across all recognized assets and liabilities.
- An asset purchase is not always an immediate expense. Buying equipment for cash changes the asset mix; later accounting determines how its cost affects performance over time.
- Negative equity is possible. The equation still balances if liabilities exceed assets; equity is then negative.