I moved of to Australia part way through the tax year and then returned to New Zealand and worked.

When I filed my tax return, it was automatically complete in New Zealand due to the IR3 file, but a tax return in Australia was done.

My New Zealand one was completed beforehand with my Australia one to follow. My Australia one states that I owe an amount of tax due to not being a tax resident for tax purposes, and I incurred interest. My NZ tax was based off my whole income earned, including international. But that came back saying I owed tax as well.

Can someone explain how this may have occured, or how I can possibly resolve this? Thank you.