I apologise for my total lack of understanding. Capital gains + tax in general + bitcoin is incredibly confusing.

If I'm mining bitcoin and earning say $100 per week, how is tax calculated from that? (For example, if I withdrew the equivalent of $100 straight from my bitcoin wallet into my bank). How would one declare that income for tax purposes?

If it cost me say $2000 for the miner and therefore takes 20 weeks to earn back the cost, would the tax be calculated for whatever profit made after that?

Anyone has further information on mining bitcoins & tax in Australia, all is appreciated!