Electricity at 35cents a hour does not make a huge deduction
Depreciation of laptop sure.
Internet - Some %
Trading platform fees etc perhaps (Live feed for data etc)
Bank fees for a dedicated account maybe
Just watch volumes that may define you as a professional trader. Then your...
While you live overseas for such a short period Australia will tax all income from all sources worldwide (incl o'seas). This includes share trading. It may be that your deductions would be very small and limited only to costs incurred in EARNING assessable income. You should retain evidence of...