You can check out this website for visa information:
If you're Australian you can enter Thailand visa free (presuming you meet certain conditions). Upon exit there is a tax, but that tax has been paid already via your flight ticket.
So nothing to pay for you upon arrival or departure.
For Aussies, 30 days visa exempt when arriving by air, 15 days visa exempt when entering by a land border.
With an Aussie passport you will get a 30 visa waiver.
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