Why Superannuation Is Australia's Defining US Tax Issue
Every other country in our coverage has one or two standout traps. In Australia, it's almost entirely superannuation. Nearly every employee has a fund opened automatically, employers must contribute 12% of salary (rising to align contributions with each pay cycle from July 1, 2026, rather than quarterly), and you cannot opt out. The problem is that the IRS has issued almost no direct guidance on how to treat it, and the default answer under existing trust rules is not favorable.
Foreign Trust, Not a Qualified Plan
A 401(k) or IRA gets favorable US tax deferral because it's a plan Congress specifically recognized. Superannuation was never built with US tax law in mind, and the IRS has not issued a revenue ruling classifying it as an equivalent. In practice, tax advisors treat it as a foreign trust under Internal Revenue Code sections 671-679, which triggers an entirely different, and more burdensome, reporting regime.
Industry and Retail Funds vs. Self-Managed Super Funds
Industry and retail funds (the default for most employees) are typically treated as employer-created trusts where you lack the level of control that triggers the most severe grantor trust rules. Even so, many practitioners take the position that employer and employee contributions are taxable as current income in the year made, and investment growth may be taxed annually if the plan is considered highly compensated or discriminatory.
Self-Managed Super Funds (SMSFs), where you personally control investment decisions as a trustee, are treated far more strictly. Because you have direct control, the IRS generally views you as a grantor of the trust: both contributions (up to AUD 27,500 concessional) and investment growth are reportable as current income, and the full foreign trust reporting suite applies.
The Form Stack
FBAR (FinCEN Form 114): Your super balance counts toward the $10,000 aggregate threshold, and typically exceeds it alone within a year or two of steady contributions.
Form 8938 (FATCA): Super counts as a specified foreign financial asset once you cross the applicable threshold for your filing status.
Form 3520 and 3520-A: Required for foreign trusts where you're treated as owner or have transactions with the trust, commonly triggered for SMSFs and sometimes for employer funds depending on the position taken.
Form 8621 (PFIC reporting): If the underlying super investments include Australian managed funds, which most do by default, those holdings are frequently classified as Passive Foreign Investment Companies, each requiring its own annual Form 8621.
Worked Example: Five Years of Contributions
An American on a 189 visa earning AUD 150,000 has AUD 18,000 (12%) contributed to an industry super fund annually. Over five years, contributions alone total AUD 90,000 (roughly $59,000 USD), before any investment growth. Under the position that contributions are currently taxable, that's US-reportable income the employee never touched, on top of whatever growth the fund generated, and on top of the ordinary Australian salary already reported via the FTC.
The 2026 Payday Super Change
Starting July 1, 2026, Australian employers must pay superannuation at the same time as ordinary wages instead of quarterly. This changes cash flow and compliance for employers, but does not change the underlying US tax treatment, the contributions are still reportable on the same basis as before, just arriving on a different schedule.
