I take the position that a ROTH is a pension account as defined in the DTA and so any gains are tax free in both the US and the UK if you claim treaty relief. The withdrawals are also tax free in both the US and the UK. Accounts like IRAs, ROTHs, 401ks, 403bs etc are all US qualified retirement accounts and so covered by the treaty. The question I always have is how HMRC treats 457 deferred compensation accounts. I suspect they would not get the advantageous treatment of a qualified retirement account because of their liberal withdrawal terms, so if I ever move back to the UK I will roll my 457 into an IRA and trade the availability of penalty free early withdrawal for UK tax treatment certainty.
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