For most home loans, 5%-20% of the property value is a good amount to aim for.
Most people have a minimum of 5% deposit, but it is possible to borrow 100% of the property value with the
NAB Tailored Home Loan (you will still need money for stamp duty and other administration costs - see
What other costs are there? for more information). Borrowing the full amount now will mean a greater amount to pay back, but it will get you into your own home sooner.
If your deposit is less than 20% you may be required to pay Lender's Mortgage Insurance. (This is insurance for the lender to protect itself from default by the borrower.) However, you may be able to avoid Lender's Mortgage Insurance by using
NAB Family Guarantee. This allows a family member to use the equity of their house or other assets (eg savings) as security for your loan.