The Accounting Equation
Master the equation everything in accounting rests on: assets equal liabilities plus equity.
TL;DR
- Hold
assetsequal toliabilitiesplusequity, always. - Every transaction keeps the equation in
balance. - Rearrange it to find
equityas what you own minus what you owe.
The Equation
AssetsEverything the business owns and controls.
Cash, equipment, inventory, receivablesLiabilitiesEverything the business owes to others.
Loans, payables, unpaid billsEquityThe owners' remaining stake after debts.
Assets - liabilitiesThe IdentityThe two sides are always equal.
Assets = liabilities + equityWhy It Balances
Two Sides Every TimeEach transaction changes at least two accounts.
No one-sided entriesSwap One AssetBuying with cash trades one asset for another.
Cash down, equipment upBorrow to BuyA loan raises an asset and a liability together.
Asset up, liability upStill EqualThe totals on both sides always end up matching.
Both sides move as oneWhat Moves Equity
Owner Puts InMoney the owner invests raises equity.
Contribution up = equity upProfitNet income earned flows into equity.
Net income = equity upLossesA net loss reduces the owners' stake.
Net loss = equity downWithdrawalsMoney the owner takes out lowers equity.
Draw = equity downUse It as a Check
Both Sides MatchAfter any entry, confirm the totals are equal.
Left total = right totalFind the ErrorAn imbalance means an entry is missing or wrong.
Off? An entry is incompleteSolve for EquityRearrange to find ownership from the other two.
Equity = assets - liabilitiesIt Is the Balance SheetThe equation is the balance sheet in one line.
Balance sheet on a pageTips
- Test any transaction by checking both sides still match; if the equation does not
balance, an entry is missing or wrong. - Read
equityas your real ownership stake: it grows with profit and owner contributions, shrinks with losses and withdrawals.
Warnings
- Taking on debt to buy an asset does not raise your
equity; assets and liabilities both rise by the same amount. - Owner withdrawals reduce
equityeven though they are not an expense, so profit alone will not explain every change.
In Practice
Follow three opening transactions and watch the equation stay in balance.
You start a business by investing your own cash, then buy equipment and take a small loan.
- Invest $10,000 cash: assets $10,000 = liabilities $0 + equity $10,000.
- Buy $4,000 equipment with cash: cash down $4,000, equipment up $4,000.
- Assets still $10,000 (cash $6,000 + equipment $4,000) = equity $10,000.
- Borrow $5,000: assets $15,000 = liabilities $5,000 + equity $10,000.
After three moves, assets $15,000 = liabilities $5,000 + equity $10,000.
Every transaction has two sides, so the equation never falls out of balance.
FAQ
Assets equal liabilities plus equity. In plain terms, everything a business owns was paid for either with borrowed money (liabilities) or with the owners' own money and profits (equity). Because every asset has a source, the two sides always match. This identity is the foundation of the balance sheet and of double-entry bookkeeping.
Because every transaction has two sides. If you buy $2,000 of equipment with cash, one asset rises and another falls by the same amount. If you buy it with a loan, an asset and a liability both rise by $2,000. There is no way to change one side without a matching change, so the totals stay equal.
Equity is what would be left for the owners if the business sold all its assets and paid off all its debts. Rearranged, the equation says equity equals assets minus liabilities. It rises when the business earns a profit or the owner puts money in, and falls with losses or withdrawals.
The balance sheet is just the accounting equation written out on a page. It lists the assets on one side and the liabilities and equity on the other, and the two totals must be equal, which is why it is called a balance sheet. If they do not match, something is recorded wrong.