Your income is the most important factor that determines your borrowing power.
Every lender has different requirements, however most banks will look closely at your current financial commitments and debts when calculating how much you can borrow.
If you have other credit cards, personal loans or a HECS debt, this might impact your ability to manage your mortgage repayments.
It is essential to make sure that your income covers all of your current financial commitments and the new proposed loan.