Those working in government jobs are often approached by companies offering salary sacrifice arrangements to buy a new car etc. Don't fall for that. Of course it sounds like you're paying less taxes because your sacrificed salary percentage is used to buy a new car but often the price of the new car from that company is inflated from market price and even if the car is totalled you have no way of escaping the repayment.

Most supers have personal contribution options but I won't go crazy with it. Even with a lowered payable tax on income you still get taxed pretty high on your super balance. Best to save your extra cash in a high interest savings account or convert them to precious metals to beat future inflation.