Question: Tax on Bank interest for non residents, these people should be charged at 10% tax but are taxed at 32.5%

if the taxpayer is a non resident (not an Australian Citizen) then bank interest tax should go to 10%.

Answer:For interest and dividends for non-residents there is a section at the bottom of Estimate page. Non-resident withholding tax. Calculation for interest and dividends is presented here.