U.S. taxes for Americans in Australia

Australia has a stable American expat population — tech and finance professionals in Sydney and Melbourne, academic and research workers, military, and growing remote-worker communities. The Australian tax system is generally well-aligned with U.S. concepts (English-language, common-law-derived) but has one notoriously contested issue: the tax treatment of Australian Superannuation for U.S. taxpayers.

This article covers the country-specific decisions.

The income tax math

Australian income tax rates (residents, 2024-25) run 0% to 45%, plus the Medicare Levy (2% on most income) and possibly the Medicare Levy Surcharge (1–1.5% for high-income filers without private hospital cover). Combined top marginal rate: ~47%.

For most Americans in Australia at a normal salary, FTC beats FEIE — Australian tax exceeds U.S. tax on the same income. See FEIE vs. Foreign Tax Credit.

The Medicare Levy is creditable as foreign income tax on Form 1116; it's imposed on the same base as the income tax. The Medicare Levy Surcharge is also treated as creditable by most practitioners.

Superannuation — the contested specialty

Superannuation (Super) is Australia's mandatory retirement system. Employers contribute 11.5% of salary (rising to 12% in 2025) to your Super fund; you can contribute additional after-tax (non-concessional) or pre-tax (concessional) amounts. Inside Super, growth is taxed at 15% (Australian); withdrawals after age 60 are tax-free in Australia.

For U.S. tax purposes, Superannuation treatment is genuinely unsettled. Three competing positions among cross-border practitioners:

Position 1: Super is a foreign grantor trust

Most conservative. You report Super on Forms 3520 (annual transactions including employer contributions and earnings) and 3520-A (annual trust information). Growth inside Super is taxable to you currently. PFICs inside (most Super funds hold managed investment funds) get full PFIC treatment.

This is brutal — full annual U.S. taxation on retirement growth, plus PFIC compliance, plus 3520/3520-A penalties for any missed year ($10K+ per form).

Position 2: Super is treaty-protected employee benefit

Under the U.S.-Australia treaty, Article 18 covers pensions and similar remuneration. Some practitioners take the position that Super qualifies as a "pension fund" under the treaty, with U.S. tax deferral until distribution.

The IRS has not formally endorsed this position. Form 8833 (treaty position disclosure) is recommended for filers taking this approach.

Position 3: Super is a foreign retirement account, currently taxable but not a reportable trust

Middle-ground position: report contributions and earnings on the U.S. return annually (no deferral), but skip 3520/3520-A. Less brutal than Position 1, more aggressive than Position 2.

The pragmatic answer for most Americans in Australia:

• If your Super balance is small (under $50K): pick a defensible position with your preparer; the absolute dollars at stake are limited.
• If your Super balance is large (over $200K): get a credentialed cross-border pro and document your position carefully on Form 8833. The treaty-protected position can save you tens of thousands annually if defensible for your facts.
• If you're contributing to Super through an employer match you can't decline: you're stuck with whichever position applies. Plan accordingly.
• PFICs inside Super: under Position 1 and Position 3, they're PFICs requiring Form 8621. Under Position 2 (treaty protected), the treaty arguably exempts them.

Cleanest U.S. treatment: hold individual stocks inside your Super where possible, avoiding the PFIC question entirely.

Australian totalization

The U.S.-Australia totalization agreement (in force since 2002) eliminates double Social Security tax:

• Employed in Australia: Australian Super contributions counted as the equivalent; no U.S. FICA.
• Self-employed in Australia: Australian self-employed contribute differently than employees — no mandatory Super; instead voluntary. The totalization treatment for self-employed in Australia is more nuanced. Apply for a Certificate of Coverage from the Australian Tax Office.

See totalization agreements.

The 50% CGT discount

Australia provides a 50% capital gains tax discount for resident individuals on assets held more than 12 months. So an asset held 13 months and sold for a $100K gain is taxed on $50K at ordinary income rates.

For U.S. purposes, the U.S. doesn't honor this discount — your full long-term capital gain (over 1 year) is U.S.-taxable at 0%/15%/20% + NIIT.

For most U.S. citizens in Australia, the Australian tax (even with 50% discount) exceeds U.S. tax → FTC offsets U.S. tax. But the Australian-side benefit doesn't reduce your U.S. obligation.

Negative gearing on Australian real estate

Australia allows "negative gearing" — net rental losses from investment property can offset other income, including salary. This is a major tax-planning tool for Australian investors.

For U.S. purposes, the U.S. has its own (more restrictive) passive activity rules. Australian rental losses cannot generally offset your U.S. salary, even though they reduce your Australian taxable income.

The U.S. tax treatment of an Australian rental property:

• Schedule E reports rental income and expenses (in USD).
• Depreciation at U.S. recovery periods (27.5 years residential).
• Australian tax paid on net rental income is creditable in the passive basket of Form 1116.
• U.S. passive activity loss rules may suspend losses to future years.

Australian "departure tax" (deemed CGT on becoming non-resident)

When you cease to be an Australian tax resident, Australia treats it as a deemed disposal of most of your CGT assets at market value on the date of departure. This triggers Australian capital gains tax on unrealized gains.

You can elect to defer the deemed CGT for certain Australian-real-property assets, but most other assets (including foreign-stocks, ETFs, etc.) are deemed sold.

This is a significant cost when leaving Australia after substantial appreciation. Plan asset sales before the formal departure date if you want to control U.S. tax timing.

FBAR and 8938 for Australian accounts

• Australian bank accounts (CommBank, Westpac, NAB, ANZ, Macquarie, online banks): FBAR-reportable.
• Australian brokerage accounts (CommSec, NABtrade, etc.): FBAR-reportable.
• Superannuation accounts: FBAR + 8938 (this is settled, regardless of treaty position on Super tax treatment).
• SMSF (Self-Managed Super Fund): highly complex. Generally FBAR + 8938 + potentially 5471 if you control the corporate trustee + 3520/3520-A if treated as foreign trust.

If you have an SMSF and are a U.S. citizen, talk to a cross-border tax pro immediately. SMSFs are arguably the worst structure for an American to hold.

Common Americans-in-Australia mistakes

• Not deciding on a Super position consistently. Year-to-year switching between treaty and grantor-trust positions creates audit exposure.
• Holding managed funds inside Super without PFIC analysis. Even on treaty position, PFIC issues are unresolved.
• Operating an SMSF as a U.S. citizen. Usually a tax disaster.
• Not realizing the deemed CGT on departure from Australia.
• Treating negative gearing as a U.S. deduction. It isn't.
• Forgetting the totalization Certificate of Coverage for self-employment work.

Next steps

• FEIE vs. Foreign Tax Credit
• The PFIC trap
• Foreign pension reporting
• Totalization agreements
• Foreign mutual funds