So I've been reading up on CGT and selling shares etc, I've...

So I've been reading up on CGT and selling shares etc, I've started to get my head around buying/selling shares and the caveats of the initial setup which is often overlooked (at least I know I didn't consider this when purchasing shares).

In regards to 'structure', I understand that everyone is different, however from a tax perspective - lets look at the numbers of some examples as to buying/selling shares as a company, individual and or a SMSF.

Company CGT on profits: 28.5%
* No 50% discount on shares held for longer than 12 months.
* Can offset losses against profits.

Individual tax rate on profits: (varies)
* 50% discount if shares are held for longer than 12 months.
* Can offset losses against profits.

SMSF (15%)
* 33.33% discount if shares are held for longer than 12 months)
* Cannot withdraw funds for personal use, can only be re-invested into the SMSF.

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So looking at the above 3 options, if you being either a company/individual or SMSF was to earn a capital gain on shares held for longer than 12 months of the total of $200,000 the following would be the CGT applied:

Company: 57k CGT (no discount)
Individual: 45k CGT (50% discount)
SMSF: 20K (33.33% discount)

SMSF is the obvious winner here, however the caveat of not being able to use those funds outside of your SMSF is a massive put-off.

So I looked into a few ASX announcements to see that a majority of companies trade using public or private companies which essentially pays the highest tax rate, for example: http://www.asx.com.au/asxpdf/20160912/pdf/43b3c58wm4lgx0.pdf

You'll notice that the 'Holder of relevant interest' appears to primarily be 'Pty Ltd' based companies.

I simply don't understand why these companies would purchase shares under a private/public company as opposed to a SMSF/individual?