I receive a PSS pension which is 100% of my income. I understand that there are taxable (taxed and untaxed sources), tax free components and tax offsets including that because I'm over 60 I also receive a 10% tax offset on the taxable component.
I attempted to replicate my tax return for last year, but was unable to find the relevant offsets in the ATO online calculator, so ended up with a tax estimate far greater than I actually paid last year (in fact I got a refund). How are these offsets and tax free components reflected in the ATO's system and how is my Medicare levy incorporated into the tax I pay from my pension?
see this info sheet for tax treatment of PSS pension
https://www.csc.gov.au/-/media/Files/PSS/Factsheets/PSF27-tax-and-your-pss-pension.pdf