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yes you do not have to give a TFN. If you do not, 50% of all interest will be given directly to the ATO and is not recoverable. The remainder of interest will be charged tax at the Personal Income Rate.
If you can get a non interest bearing account then it doesn’t matter. This what I did initially, however the bank I used closed all non interest bearing acc’s and I had to open another acc. Obviously they pay a pittance in interest anyway so it’s here nor there. Just means doing time wasting calculations on tax returns.