What one review found.
Leaving Australia is taxed as a sale. For this client, a move to the UK in June 2027 means a deemed gain of about AUD 137,600 on the two taxable accounts, AUD 76,900 of it taxable after the discount, before a single share is sold.
Why: on ceasing to be resident, CGT assets other than taxable Australian property are taken to be disposed of at market value (CGT event I1). The SMSF is left out; the CommSec and IBKR accounts are not. The gain is measured against a cost base replayed from the confirmed trades, parcels taken first in, first out, each at its own date’s exchange rate, and the 50% discount is applied parcel by parcel to those held at least 12 months. The review sets out the choice that follows: report the gain in the return for the year of leaving, or disregard it, in which case the shares stay taxable in Australia until they are sold or the client returns, and the later change in value is taxed too.
Decision support for professional review, not tax advice. The tax itself is not computed: the taxable part is taxed at the client’s marginal rate. First in, first out is an assumption; parcels the client identifies can give a different cost base. A holding whose cost is not known stops the total; it is never guessed.