With most lenders and for nearly all property types, having a 20% deposit (and therefore, an 80% LVR home loan) is sufficient to make sure you don’t need to pay for Lenders Mortgage Insurance (LMI). This one off payment of LMI can be thousands of dollars that are added onto the loan and avoiding this cost is a significant saving both upfront and over the life of the loan.
There are some specific property types where this may not be the case, particularly high density, inner city apartments. Your mortgage broker will make sure the property you are purchasing or refinancing is okay with your chosen lender in these cases.