Tax on remittances

Hello!

I have a question about remittances into Japan.

In a previous tax year, I made remittances into Japan, about $15KAUD. Primarily to pay tax and insurance. I am a non permanent resident of Japan.

During that year I earned about $82K AUD, all of which was taxable in Japan. This is because I was working remotely in Japan, but was paid into an Australian bank account. I also earned capital gains, which was taxable because the stocks were bought and sold while I was in Japan.

The remainder of my money outside Japan (from which I made the remittances) was primarily savings but also a small amount of income which was not taxable in Japan. Probably less that $10KAUD.

So my question is – are the remittances taxable to the extent I had foreign income not taxed in Japan? Would seem pretty harsh seeing as I have to make the remittances to pay taxes and insurance.

Thanks for your help!