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I did my tax return September last year paid it etc, now on the ATO there is a new assessment claiming I owe a bit of $$$ that was done in March, I did not do this. It’s IMPOSSIBLE to ring the ATO. How did I take this further?
Have you checked the portal under income tax lodgments to see if the ATO has amended your original return, or under accounts and payments - income tax, this will be shown as ATO amended, on Notice Of Assessment.