A CGT event happened on 21 July 2011, when nib paid a capital return on your nib shares.
The capital return is a non-assessable payment. If you continued to own your nib shares after 21 July 2011, you must adjust the cost base of your shares as a result of receiving the non-assessable payment.
You received $0.1607 for each share that you held on 13 July 2011. This amount is your capital proceeds.
You must include the capital gain on your 2011-12 tax return (supplementary section) if you have made a capital gain.
For more information on non-assessable payments, see Non-assessable payments.
What is the cost base (and reduced cost base) of my shares?
If you acquired your nib shares under the demutualisation of nib on 1 October 2007, the cost base (and reduced cost base) of each of your nib shares is $0.85.
If you purchased your nib shares after they were listed in October 2007, the cost base (and reduced cost base) of each of your nib shares is the price you paid for them (plus any incidental costs such as brokerage).