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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 single most important idea in accounting 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 actually yours once the debts are paid off. 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. That’s the whole idea — what you own, minus what you owe, is what’s yours: Assets−Liabilities=EquityAssets - Liabilities = Equity
TermPlain meaningHouse example
AssetWhat you ownThe $300,000 house
LiabilityWhat you oweThe $200,000 mortgage
EquityWhat’s left over for youThe $100,000 that’s yours

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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 get the same idea flipped around — the form accountants actually 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 flips it to show how everything I own was funded — nothing changes but the order. Everything the business owns was paid for 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

Here’s the part people miss: 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’s not a coincidence — it’s the rule that makes accounting trustworthy. If your books don’t balance, you know immediately that something was recorded wrong.

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In short

  • Assets are what you own, liabilities are what you owe, and equity is what’s left over for you.
  • The accounting equation — Assets = Liabilities + Equity — just says everything you own was funded either by debt or by your own stake.
  • It always balances: every change on one side forces a matching change elsewhere. A broken balance is a sign of an error.
Next upYou’ve got what a business owns, owes, and keeps. The other half of the picture is what it earns and spends — meet Revenue, expenses & costs, and how profit feeds back into equity.