Impact of Roth IRA and Roth 401k

 Author: knaresbro(Devotee)Devotee

1 Sept 2025

As you're no doubt aware, there's a fundamental difference between the tax systems of Australia and the USA. The former, like all but two countries in the world, has residence-based taxation ... and the latter is unfortunately one of the two that has citizen-based taxation!

Luckily, the answer to all three questions - given you will not be an Australian resident for tax purposes at the time - is "no"; ATO taxes won't apply. (And "if I become an AU citizen instead of PR?" isn't going to make a difference.)

You should, however, consider what taxes would apply in Australia if you're here at the time of a withdrawal. Whilst income from Roth accounts (which is generated from after-tax contributions) is tax free in the USA to US taxpayers, the ATO doesn't quite differentiate between a 401(k) and a Roth 401(k) in the say way. So you may pay some tax, calculated only on the fund's earnings and generally not on the contributions.

And lastly (from my family's experience) I'd suggest you find a dually-qualified tax specialist and/or do lots of research from reputable sources. And I wish you the best of luck, @expat777 !

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