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Every business (and honestly, every person) can describe its financial life with three words: assets, liabilities, and equity. Get these three and the accounting equation falls into place. Let’s use a house.

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The three words, in plain terms

  • Assets: everything you own that has value. Your house, your car, the cash in your account, the money customers still owe you.
  • Liabilities: everything you owe to someone else. Your mortgage, your car loan, an unpaid bill.
  • Equity: what’s yours after you pay off the debts. It’s the leftover.
Say your house is worth $300,000 (an asset). You still owe $200,000 on the mortgage (a liability). The part that’s truly yours (your equity) is $100,000. What you own, minus what you owe, is what’s yours: Assets−Liabilities=EquityAssets - Liabilities = Equity

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The equation that ties them together

You just saw the equation one way. Move Liabilities to the other side and you see the same idea in reverse. This is the form accountants use, called the accounting equation: Assets$300,000 house = Liabilities$200,000 mortgage + Equity$100,000 yours\underset{\$300{,}000\ \text{house}}{\text{Assets}} \:=\: \underset{\$200{,}000\ \text{mortgage}}{\text{Liabilities}} \:+\: \underset{\$100{,}000\ \text{yours}}{\text{Equity}} It’s the same sentence written two ways. The first asks what’s truly mine? The second asks how did I fund everything I own? Nothing changes but the order. The business paid for everything it owns in one of two ways: with money it borrowed (liabilities) or with money that’s its own (equity). So the total value of what you own always equals the sum of those two sources.

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Why it always balances

The equation can never be out of balance, by design. If something changes on one side, something else has to change to keep it even.
  • You buy a $20,000 car with a loan. Assets go up by $20,000 (the car). Liabilities go up by $20,000 (the loan). Still balanced.
  • You pay off $5,000 of that loan with cash. Assets drop by $5,000 (cash leaves). Liabilities drop by $5,000 (debt shrinks). Still balanced.
  • The business earns $10,000 in profit. Assets go up by $10,000 (cash). Equity goes up by $10,000 (it’s yours to keep). Still balanced.
Every real-world event touches the equation in a way that keeps both sides equal. That is the rule that makes accounting trustworthy. If your books don’t balance, you know immediately that something in the records is wrong.

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Next steps

Next upYou’ve got what a business owns, owes, and keeps. The other half of the picture is what it earns and spends. See Revenue, expenses & costs, and how profit feeds back into equity.