Does Alliant offer piggyback HELOCs (home equity lines of credit)? Yes, Alliant offers piggyback HELOCs. A piggyback HELOC may help prospective homebuyers better afford a home by taking out two loans at the same time—one for the mortgage itself and a secondary HELOC (home equity line of credit). It offers the following benefits: Avoids private mortgage insurance (PMI) with less than a 20% down payment May provide a lower overall mortgage payment Increases your purchasing power May help you afford your dream home