Hi,
The ATO has readily available tax tables. Hard copies at the newsagent or online at http://www.ato.gov.au/businesses/content.asp?doc=/content/33283.htm
or http://www.ato.gov.au/businesses/pathway.asp?pc=001/003/019&mfp=001/003&mnu=601#001_003_019 for some calculators.
Have fun :)
Sue
