FYI it looks like these cards will no longer earn points on ATO payments after 27 February 2016.
Taken from Australian Business Traveler website: "You’ll pay no annual fee in the first year for any of these cards, although be aware that from February 27 2016 ANZ will cease awarding points on all ATO credit card payments: so if your plans involve paying down your HECS debt, get in before then to earn those valuable points."
Pay tax. HECS with credit cards and earn frequent flyer points - Australian Business Traveller
Taken from Australian Business Traveler website: "You’ll pay no annual fee in the first year for any of these cards, although be aware that from February 27 2016 ANZ will cease awarding points on all ATO credit card payments: so if your plans involve paying down your HECS debt, get in before then to earn those valuable points."
Pay tax. HECS with credit cards and earn frequent flyer points - Australian Business Traveller