Hi dunroving, good to see you again....we must stop meeting like this.
I've talked to Vanguard about opening accounts with them and they don't do it for non-US residents. This inflexibility makes managing US retirement accounts difficult without a ridiculous amount of planning before leaving the US.
The 401a is mostly for state and government employees so my answers will assume that and that Article 19 of the tax treaty applies. If that's not correct then Article 17 will apply.
Therefore, as a UK citizen (non-US citizen) resident in the UK Article 19.2(b) applies and both lump sum and periodic withdrawals are only taxable in the UK. You'd file a W-8BEN with TIAA-CREF and would not need to file a 1040NR if the 401a was your only US source income. You'd then pay UK tax on 90% of those pensions.
Thanks, Nun. It seems crazy that if I was in the US on a short-term exchange and residing there short-term, I could open an IRA, and/or that if I'd opened an IRA before I left, TIAA-CREF would have been perfectly happy to roll over into that IRA. Bonkers. It's particularly frustrating as it means I can't take advantage of your insight into the unique situation of US non-resident, non-citizen folks when rolling over into a Roth. Ah, well.
You are right in your assumption about me being a former state employee (state universities).
It's a shame the lump sum is taxable in the UK as US tax treatment would be preferable. I'll try to find the Web site that indicated lump sums were taxable in the US only, periodic payments and annuities taxed in the UK only. Unfortunately I closed the page after reading it.
ETA: Interesting, I didn't find the page yet, but found this page (from 2002):
http://www.us.kpmg.com/microsite/tax/ies/tea/summer2002/stories/article06.htmContaining the following text:
"New U.S.–U.K. Treaty
A new tax treaty between the U.S. and the U.K. was signed on July 24, 2001, but not ratified. The treaty's related Exchange of Notes recognizes a 401(k) plan as a valid "pension scheme"; therefore, look to article 17 for guidance on the taxation of the distribution. As valid "pension schemes," they will be treated in the same manner as approved U.K. schemes.
Article 17 of the new treaty states that a pension distribution is generally taxable only in the country of residence; however, if the distribution is paid out as a lump sum, it will be taxed only in the country where the scheme is established. Therefore, the form and the timing of the distribution will determine which country's tax laws would apply. In summary:
•Periodic payments—taxed in the country of residence
•Annuities—taxed in the country of residence
•Lump sum—taxed in the source country. **** [my asterisk]
While it is not yet clear how the new treaty will interact with U.K. domestic law, it is likely that the periodic payments and the annuity element of the pension would be taxed in the U.K. if upon receipt, the individual were a U.K. resident. However, the United States would have taxing jurisdiction if the form of the distribution were as a lump-sum payment."
- do you know anything about the new tax treaty mentioned? I presume it never was ratified?