Equity is ownership. In homeownership, equity refers to how much of your home you actually own—meaning how much of the principal you’ve paid off. The more equity you have, the more financial flexibility you have, as you can refinance against whatever equity you’ve built. Put another way, equity is the difference between the fair market value of the home and the unpaid balance of the mortgage. If you have a $400,000 home, and you still owe $300,000 on it, you have $100,000 in equity.