Family Guarantee Line of credit (HELOC): Meaning, and you may Examples What is property Security Personal line of credit (HELOC)? A property collateral personal line of credit (HELOC) is a credit line using this new collateral you really have in your home due to the fact equity. The amount of borrowing out there will be based upon the fresh guarantee of your house, your credit score, along with your loans-to-earnings (DTI) ratio.