What is Home Equity?

Home equity represents the financial interest or share of ownership that a homeowner possesses in their residential real property, calculated as the current fair market value of the home minus the cumulative outstanding balances of all mortgages, liens, and other encumbrances secured by that property. Equity is a dynamic asset that increases as the homeowner pays down their mortgage principal (via regular amortized payments or voluntary prepayments) and as the property appreciates in value due to market forces or capital improvements. Conversely, home equity can shrink if local housing market conditions cause property values to decline, potentially resulting in negative equity (being 'underwater'), where the outstanding debt exceeds the property's market value.

Homeowners can leverage their accumulated equity as collateral to secure credit products, such as Home Equity Loans (closed-end, fixed-rate second mortgages) or Home Equity Lines of Credit (HELOCs, open-end, variable-rate revolving credit lines). To manage lending risk, financial institutions calculate the Combined Loan-to-Value (CLTV) ratio and typically cap total borrowing at 80% to 85% of the property's appraised value, leaving a 15% to 20% equity cushion to absorb market fluctuations. Under the Tax Cuts and Jobs Act (TCJA), the interest paid on home equity loans and HELOCs is only tax-deductible if the loan proceeds are used specifically to buy, build, or substantially improve the taxpayer's home that secures the loan, up to a total mortgage debt limit of $750,000 (or $375,000 for married filing separately).