What I refer to is.... Your home is free from capital gains( in...

What I refer to is....
Your home is free from capital gains( in most cases), however, if you start claiming mortgage costs etc for using a room as an office, the tax depth will " quarantine" your "office" from the rest of your home, in effect treating it as an "investment property", much in the same way as using airbnb for spare rooms or a granny flat.

As far as deductions go for trading, I have very little to work with ( mainly due to having low costs).... internet use, asic search fees, depreciation of phone/ laptop being the main ones, with hotel costs if if travel to agm's etc.
A bonus(?) of online trading is everything is online, so, record keeping is minimal, it's all available quickly, but, and no doubt the tax depth knows all to well, cooking the books is difficult and risky given your online breadcrumb trail.