Ever checked the tax on your payslip?
You haven't, might be because its buried within the pages and pages of information the ATO offer.
The ATO calculator allows you to check that the numbers on your payslip look right.
We do lots of novated lease QuoteMe's and regularly see variances between the payslip and the ATO's numbers.
ATO Tax Calculator
Another site with a lot more details is 'Pay calculator'.
It uses a simpler layout and covering the tax points plus you can include or exclude superannuation numbers.