Death and Taxes
The only 2 things certain in life. Fortunately, the serving member can get a free will through ADF and if you choose to send off a P85 and move your wealth to Australia then there will be no inheritance tax.
The UK and Aus tax systems vary, the main difference for you is the tax-free allowance in Aus doesn’t change annually, as your ADF pay, allowances, UK pension or rental income etc increases, more of it ends up in higher tax brackets every year, negating the increase.
Here are the tax rates you will be on in Australia 26-27:
See an annual example of how hypothetical SGT Jones overseas income ends up taxed at higher rates
Using paycalculator.com.au you can add in your expected income, expected pension rate or other income streams (Just remember to convert to AUD)