I am currently living in UK but (with my wife) hoping to move to queensland under the contributory aged parent visa system.
we have investments in UK including ISAs which are effectively tax free (both income tax and CGT. such tax benefits would be lost once we beome australian tax residents.
are there any investment schemes in australia which carry tax benefits or is all investment and savings interest income simply added to income and taxed at the marginal rate?

Capital gains from assets held for more than 12 months can often be taxed on only 50% of the gain.