The Accounting Equation & the Balance Sheet

You’ll be able to

State the accounting equation and define assets, liabilities, and equity
Explain how a balance sheet reports a firm’s financial position
Apply the accounting equation to solve for a missing value

The accounting equation

All of accounting rests on one identity: Assets = Liabilities + Equity. Assets are what the business owns or is owed — cash, inventory, equipment, accounts receivable. Liabilities are what it owes to others — loans, accounts payable, unpaid wages. Owner’s equity is the owners’ residual claim, what would be left if all assets were sold and all debts paid. The equation must always balance, because every asset is financed either by borrowing (liabilities) or by owners (equity).

The balance sheet

The balance sheet is the financial statement that reports the accounting equation at a single point in time — a snapshot of what the firm owns, owes, and is worth. It lists assets on one side and liabilities plus equity on the other, and the two totals must be equal. Assets and liabilities are usually split into current (within one year — cash, payables) and non-current/long-term (equipment, long-term debt). The balance sheet answers, "What is the firm’s financial position right now?"

Why it always balances

The balance sheet balances by construction: every source of funding (a liability or owner investment) shows up as something the business now controls (an asset). Borrow $10,000 and cash (an asset) rises by $10,000 while a loan (a liability) rises by $10,000 — the equation stays equal. This double-sided logic, called double-entry accounting, is why an unbalanced balance sheet signals an error rather than a business condition.

The accounting equation

Assets = Liabilities + Owner’s Equity

Rearranged, Owner’s Equity = Assets − Liabilities. Because it is an identity, knowing any two values lets you solve for the third.

Worked example

A small business reports total assets of $250,000 and total liabilities of $90,000. What is the owner’s equity? Then the owner takes out a new $30,000 loan, received as cash — how do assets, liabilities, and equity change?

1.Rearrange the accounting equation: Owner’s Equity = Assets − Liabilities = $250,000 − $90,000.
2.Compute equity: $250,000 − $90,000 = $160,000.
3.Now record the loan: cash (an asset) rises by $30,000, so assets become $280,000; the loan (a liability) rises by $30,000, so liabilities become $120,000.
4.Check the equation: $280,000 = $120,000 + $160,000. Equity is unchanged at $160,000 because the loan added an asset and an equal liability, not owner value.

Answer: Owner’s equity is $160,000. After the loan, assets rise to $280,000 and liabilities to $120,000, while equity stays at $160,000 — borrowing changes assets and liabilities equally, leaving equity untouched, and the equation still balances.

Checkpoint

A company has total assets of $500,000 and owner’s equity of $300,000. What are its total liabilities?

Tip

Whenever a transaction confuses you, ask: "Which two accounts does this touch?" A cash purchase of equipment swaps one asset for another; a loan raises an asset and a liability together. If only one side moves, you have missed an entry.

Checkpoint

The balance sheet is best described as:

On the exam

Know the difference between the two core statements: the balance sheet is a snapshot at a point in time (position), while the income statement covers a period (performance). Confusing the two is a frequent error on financial-statement questions.

Answer the 2 checkpoints as you read.