A second mortgage or junior-lien is a loan you take out using your house as collateral while you still have another loan secured by your house. Home equity loans and home equity lines of credit (HELOCs) are common examples of second mortgages
If you’re already paying off one mortgage, you may wonder why some lenders invite you to take out another. The term, “second mortgage” makes it sound like you're trying to finance a vacation home or an investment property in addition to your primary residence. In truth, a second mortgage is a loan that is taken out on a property that is already mortgaged. The most common kind of second mortgage is a loan that uses the equity you’ve built in your home as collateral to borrow a new sum of money. When we say, “equity,” we’re talking about the current value of your home, less what you still owe on your mortgage. In other words, it’s the portion of your home that you actually “own.” If your home is worth $500,000 and you have $300,000 owing on your mortgage, then you have $200,000 in equity. Because equity is an asset, it’s possible to use it as collateral and turn it into cash—thus, “second mortgage.”
Homeowners who take out second mortgages usually do so to pay off other debts. For example, let’s say you have a high student loan bill due, and you don’t have the money to pay it. You do, however, have $150,000 in equity from your home. In this instance, you could use your home to take out a second mortgage to help pay your bill. There are 3 kinds of second mortgages: home equity loans, home equity lines of credit (HELOCs), and piggyback loans. All 3 have the same intended purpose—to provide you with a substantial amount of money to make a large purchase or pay off significant debts—but there are some important distinctions between each.