What Is Equity? Home Equity & Shareholder Equity Defined
Equity is the portion of an asset you truly own: its current market value minus what you still owe on it. A $400,000 home with a $260,000 mortgage balance carries $140,000 of equity. It grows in two directions at once, as principal payments shrink the debt and appreciation lifts the value.
Equity is the part of the asset the bank cannot take if you sold it today and paid off the loan.
Equity = market value − amount owed. A $400,000 home with a $260,000 mortgage balance has $140,000 of equity. If the home appreciates 4% in a year ($416,000) and payments cut the balance to $255,000, equity jumps to $161,000 — both forces worked in your direction. The same arithmetic applies to a business, where equity is what remains for the owners after every liability is paid.
The arithmetic of home equity
Two numbers are involved and they move in opposite directions. The value of the home can rise or fall. The balance on the mortgage can only fall, because you are paying it down. Equity is the gap between them, so it can increase for either reason - and it can decrease for either reason too, which is the part most explanations leave out.
| Situation | Home value | Balance | Equity | What happened |
|---|---|---|---|---|
| Purchase, 20% down | $400,000 | $320,000 | $80,000 | 20% equity from day one |
| After 5 years of payments | $400,000 | $295,000 | $105,000 | 26% - equity grew without the house moving |
| Same 5 years, house fell 10% | $360,000 | $295,000 | $65,000 | 16% - five years of paying down partly undone by price |
| Severe fall after buying at 5% down | $300,000 | $340,000 | -$40,000 | Negative equity: you owe more than the house is worth |
The last row is the one that matters, and it is not theoretical. Someone who buys with 5% down has 5% of a cushion; a 15% fall puts the balance above the value. That is negative equity, it is the state that triggers a short sale or a foreclosure referral, and it is why a larger down payment is insurance rather than an optimisation.
Equity as a ratio, and when a lender measures it
"How much equity do you have?" is rarely answered with a number. It is answered with a ratio, and there are two common ways to state it.
| Term | How it is calculated | On a $400,000 home with a $320,000 balance |
|---|---|---|
| Home equity percentage | Equity divided by home value | $80,000 / $400,000 = 20% |
| Loan-to-value (LTV) | Balance divided by home value | $320,000 / $400,000 = 80% |
The two move together and always add to 100%. Knowing the LTV tells you where you sit against the usual lending thresholds: below 80% you can generally refinance without mortgage insurance, and 20% down is the level most conventional products assume. It is also the number a lender recalculates from a fresh appraisal, which means a fall in prices can change what you are offered even though nothing about you changed.
Shareholder equity is a different calculation with a similar name: assets minus liabilities on a company balance sheet. A business can be profitable and still have negative shareholder equity, and a business with strong equity can still fail. The word means the same thing in both cases - what you own after what you owe - and nothing more.
How home equity builds (and why it accelerates)
Two engines drive it. First, every mortgage payment chips away at principal: on a 30-year, $300,000 loan at 6.4%, the first payment of about $1,877 contains only $277 of principal, but by year 25 the majority of each payment is principal. Second, appreciation raises the value side. Only the first engine is guaranteed — property values can fall, which is why equity built by paying down principal is the safer kind.
Equity matters because it is the household's largest store of wealth in most countries, and because it can be borrowed against — a home equity loan (lump sum), a HELOC (a credit line), or a cash-out refinance (a bigger mortgage). All three put the home up as collateral, so the flexibility carries real risk. And when you sell, equity is what lands in your pocket after the agent and the lender are paid: on a $400,000 sale with a $260,000 balance and roughly $24,000 of selling costs, you walk away with about $116,000.
The same word in business and investing
In a company, shareholders' equity is total assets minus total liabilities — what would remain for the owners if everything were sold and every debt repaid. In investing, "equity" also means an ownership stake itself: buying a stock is buying equity in the business. The connecting thread is the same subtraction in every case: what it is worth minus what is owed on it.
Frequently Asked Questions
What is equity in simple terms?
The part of an asset you truly own: its market value minus what you owe on it. A $400,000 home with a $260,000 mortgage balance carries $140,000 of equity.
How does home equity grow?
Two ways. Principal payments shrink the loan balance with every payment, and appreciation raises the property's market value. The principal portion of a fixed payment starts small and grows every month, so equity accelerates in later years.
Can I borrow against my equity?
Yes: a home equity loan pays a lump sum, a HELOC works like a credit line, and a cash-out refinance replaces the mortgage with a larger one. All three put the home up as collateral, so missed payments put the house at risk.