To get the information straight from the horse's mouth access the ATO webiste at www.ato.gov.au. Of if struggling with this see an accountant, like me!
ASIC (Australian Securites and invstments Commission) are Australia's Corporate Markets and financial services regulator. See www.asic.gov.au
For financial informtion see www.moneysmart.gov.au This website will assist with everything financial with calculators and everything you need to make your best financial decisions.