Tax calculator for Australians. Easy to use, supports various pay periods.Aussie Tax Calculator is an app to calculate your tax return at the end of the financial year for Australian tax payers. Find out your estimated tax return. Easy to use, enter your income weekly, fortnightly, monthly or annually. Currently supports financial years 2013-2014 and 2014-2015. Your tax return is an estimated value calculated from the amounts you enter for income, tax contribution (PAYG Withholding), medical levy, private health insurance offset, deductions you have claimed, etc.