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I think this depends on your savings goals and what you can get away with. If you enjoy the shorter term cash flow of paying less as you go (PAYG), can get away with it and have enough of an opportunity to earn some additional returns with it or invest it wisely, then go ahead and do it. If you have problems saving this money to pay your taxes at the EOFY, then consider it a “compulsory savings account” with the ATO by paying more as you go.