The untaxed element has a maximum tax rate of 30% when passed down to non-dependant beneficiaries...so it would be the lower of their marginal rate or 30%. You might be able to consider moving more funds outside of the super environment, or putting in place a testamentary trust if you're concerned about this. There are strategies available. This is not advice, DYOR.
With unrealised gains/losses, they might be reported as far as showing the performance of your fund each year. However, capital gains/losses are not included in assessable income until they are realised.
Thanks for that Junior, more research needed at my end it seems, have tried the ATO site but was more confused than when I started so will get the Admin people onto it.
Regards counting unrealised Cp/Gns etc as income will have to see how they set the Bill up.
My returns will have to be rearanged if it gets in.DYOR etc.
thanks again.