From 10 October 2016, the IP Australia official fees are changing. The Trade mark registration fee is being reduced to zero from $300 per class, while the trade mark application fee increases from $120 to $250 per class. This is still a saving of $170 per class if you file your Trade Mark application after 10 October . If your Trade Mark is filed before 10 October 2016, you will still need to pay the $300 registration fee per class after your trade mark is accepted, even if registration occurs after 10 October 2016.
I recommend holding off filing a TM application until after 10 October to take advantage of the $170 saving.