How is Australian tax residency determined and why does it matter?

Australian tax residency is determined by a set of legal tests under the Income Tax Assessment Act 1936 — it is not simply based on citizenship or where you hold a passport. Residents are taxed on worldwide income; non-residents are only taxed on Australian-sourced income.

The four residency tests (applied in order):

• Resides test: The primary test — you are a resident if you 'reside' in Australia. This considers factors including physical presence, family and social ties, business ties, and your intention. It is a 'totality of facts' assessment with no bright-line rule.

• Domicile test: If your domicile (permanent home) is in Australia, you are a resident unless the ATO is satisfied your permanent place of abode is outside Australia.

• 183-day test: If you are physically present in Australia for at least 183 days in an income year, you are a resident unless the ATO is satisfied your usual place of abode is outside Australia and you do not intend to take up residence in Australia.

• Superannuation test: Australian government employees working overseas may be treated as residents under this test.

Why it matters enormously: A tax resident pays Australian tax on worldwide income — including overseas salary, foreign rental income, and offshore investment gains. A non-resident pays Australian tax only on Australian-sourced income, faces higher marginal rates on that income (no tax-free threshold, 30% from dollar one), and cannot access most tax offsets.

The 'temporary resident' category: Certain visa holders who are temporary residents for tax purposes are taxed as residents on Australian-sourced income but are generally exempt from Australian tax on most foreign investment income.