Greetings @britishrob! This is a great question.
- The payor, or bank that holds your 401(k) will provide you a 1099-R for the year that distribution is made. You would report this on your income taxes. Note that your entire withdrawal will be taxed as US income because the contributions to your 401(k) are made with pre-tax dollars.
- You would only need to file US income taxes when you withdraw the funds.
Here's a great article to review that provides great information and options to consider for a nonresident with a 401(k) that is planning to return to their home country.
https://www.investopedia.com/articles/personal-finance/100515/how-are-401k-withdrawals-taxed-nonresi...
@britishrob Hope this helps and good luck on your move!
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