This is an extremely complex area of tax lawEssentially if you...

This is an extremely complex area of tax law

Essentially if you are a non resident for tax puposes then you don't pay tax on Australian derived income, though there maybe some withholding implications attached to income like interest

Although the 186 days is a test in determing residency it is not the only test or conclusive one way or the other and a number of factors need to be taken into account

Just read some articles on Paul Hogan's fight with the ATO to get an understanding of how complex this determination can be.

there are also potentialy CGT implications on assets held at the time you cease to be an Australian tax payer

If you are a resident Australian tax payer ALL income derived regardless of the country it is derived in is taxable income in Australia.

Tax free salaries and wages you earn in a country that does not tax salary and wages will be taxable income in Australia because under Australian tax law salaries and wages are taxable income

You may however be entitled to a tax credit in Australia on any foreign income that has been taxed in the country it was derived in.

Do yourself a massive favour and go and seek proper professional assistance from a tax accountant. There are far to many factors to be considered that can vastly change the outcome of your situation to work off well intended but probably incorrect advice from here.