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I went in to centrelink last year and notified them I was a non lodger. She punched in a few numbers, told me then and there how much my top up was and when it would be paid. I had the money within the week
I completed my tax return last wednesday. Notification from Centrelink today my FTB balance will be paid later this week.
I told clk I didn't need to lodge a tax return (online) on the 1st of July and the top up was in my account on the 8th