Hello again, Rob! Great to see you once more.
So you noted you are a non-resident alien, in which case you would need to use Non-Resident tax prep software, this company is the tax partner of TurboTax: https://www.sprintax.com/
Many nonresident aliens who live and work in the U.S. choose to invest in a retirement plan offered by their American employers. However, when it’s time to return to your home country, this can create quite a quandary. Should you leave your funds in the 401(k)? Should you cash it out before you leave the U.S. or wait until you’re back in your home country? Should you roll it over into another account? And how will your 401(k) withdrawals be taxed once you no longer live in the U.S.?
As far as income, upon withdrawal the investments would generate income, issued on a 1099-R, and at that point you would need to file a US Tax Return, but not every year.
Sources:
https://www.irs.gov/individuals/international-taxpayers/nonresident-aliens
https://www.irs.gov/retirement-plans/plan-participant-employee/401k-resource-guide-plan-participants...
https://www.irs.gov/pub/irs-pdf/p590b.pdf
Additional Information for Withdrawals:
https://www.irs.gov/individuals/international-taxpayers/nra-withholding
I hope that helps!
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