What it is
A federal government scheme that lets eligible first home buyers purchase with as little as a 5% deposit and pay no Lenders Mortgage Insurance. The government guarantees the portion of your deposit that falls short of 20%, so the lender doesn't need LMI to cover its risk.
You're not borrowing the difference and you're not giving up any share of your home. The guarantee simply sits behind your loan, and it falls away as you build equity.