A "piggyback loan" is a home financing option in which a property is purchased using more than one mortgage from two or more lenders. While there are many variations, the piggyback loan, also known as the 80-10-10 loan can typically be defined as a 10 percent second mortgage coupled with a traditional 80 percent first lien and a 10 percent down payment, hence the 80-10-10. But this type of a loan can be mixed in different variation to make up the difference between a conventional loan and almost any amount of down payment. Other examples are an 80-5-15 or the 80-20 loan.
A piggyback loan is basically a second mortgage given at the time of a home purchase or a refinance. This type of a loan allows the home buyer to acquire or refinance a home with less than a 20 percent down payment or equity. An advantage to this type of loan is that the homebuyer does not need to carry private mortgage insurance (PMI).
Homebuyers can also use piggyback loans as a source of funding for making a bigger downpayment on the new home. Homeowners who don't have the funds to make the 20 percent downpayment can use this loan to their advantage because private mortgage insurance can be expensive and is not tax deductible.