Perhaps you're wondering if it's a non-capital cost of ownership such as may factor into the cost base for the calculation of CGT
(section 160ZH).
Or perhaps if it's an incidental cost of ownership.
This is not really a question for lawyers (and especially not a question for real estate agents or conveyancers).
You'll get your best advice here from an accountant (by which I mean a proper CPA, CA, or NIA).
This because among others things, there are different types of cost bases (ordinary, indexed, or reduced)
depending on how long you owned the asset, and
because an accountant will do for you the one thing you actually want,
which is to reliably calculate The One Number At The End Of It All.
Bear in mind also that if the property is being inherited, then the sale may not be a CGT event, or may be partially exempt.
You can read some of what the ATO says about that angle
here.