G'day Nikolina,
It seems you still have some misconceptions - let's see if this helps:-
Is CGT calculated differently if the property is owned by joined tennants?
Yes, it is. The CG is shared 50:50 between the two people involved. Thus they add HALF of the CG to each of their Tax calculations. (One might be on a Marginal Rate of 46.5%, with the other on 31.5% - so one might pay less CGT than the other).
When it comes to submitting your tax at the end of financial year your personal tax is calculated separately from your capital gains.
As others have said, they are "joined at the hip" - and the amount of CGT you pay depends on what your Income for the year was.
You seem to be talking of $80k as though this is the Tax you are likely to pay. Using your earlier figures, this $80k is the Cap Gain you are assessed as making. The Tax paid on that will likely be between 41.5% and 46.5% (depending on your Taxable Income before CG is added).
Thus you will end up paying less than $40k (or less than $20k if you are selling as a Joint Tenant). Not too bad for a $200k gain is it?
Re "what else can you do to reduce it", I'd say re-read what has already been said - maybe one (or more) of these ideas CAN help you. Or take it to an Accountant where they can sit down with you to map out the best result.
CGT is one of those areas where it is good to plan it (I gather this is what you are doing - you haven't actually sold yet?) as there are some ways to legally reduce it.
GSJ's post seemed to use your figures to give you the idea on how it works. Have another good read of that post.
CGT would be one of the most commonly mis-understood areas of investing IMHO. Probably because most people aren't dealing with it week by week. So feel free to keep on asking - we'll help as/when we can,
Edited later:- A couple of other thoughts - Cap Gains can be Offset by Cap Losses - so you might want to consider selling any "dog" shares that haven't done well. Also, by selling early in the new FY, the Tax is not payable until after that FY finishes (giving you the use of that money for a year or so.
And if planning to sell, can you do that in a year where you haven't earned much as Income? It all helps,
Regards,