Australia has a "good" system for this (or fair system) - when you leave the country you either choose to pay CGT based on the value at that date, or Australia has a claim on the assets when you eventually sell.
If you cease to be an Australian resident while overseas, we deem some of your assets – generally those not taxable Australian property – to have been disposed of for CGT purposes. This may mean you become liable to pay CGT.
You can choose not to have this deemed disposal apply. But if you do eventually dispose of the assets, we consider the whole period of ownership – including any period when you're not an Australian resident – when we calculate a capital gain or loss for CGT purposes.
Source -> https://www.ato.gov.au/individuals-and-families/coming-to-au...
If you cease to be an Australian resident while overseas, we deem some of your assets – generally those not taxable Australian property – to have been disposed of for CGT purposes. This may mean you become liable to pay CGT.
You can choose not to have this deemed disposal apply. But if you do eventually dispose of the assets, we consider the whole period of ownership – including any period when you're not an Australian resident – when we calculate a capital gain or loss for CGT purposes.