Australia-Spain tax treaty and CGT on Australian property
The Australia-Spain Double Tax Agreement (DTA) prevents double taxation. As a Spanish tax resident, your worldwide income is taxable in Spain. Capital Gains Tax (CGT) on Australian property sold while you are a Spanish tax resident is generally taxable in Australia first, according to Australian tax law. Spain will then tax the gain, but you can claim a foreign tax credit in Spain for taxes paid in Australia, mitigating double taxation. Specific advice from a tax professional is essential.