There's something any US Person in the UK should be keeping an eye on: The rumoured 'pension ISA' or 'ISA pension', or whatever it might be called if it were ever to materialise. The media have concentrated on the eradication of the 25% lump sum aspect, but have any of you looked at the implications for US taxpayers and the loss of any foreign tax credits on a UK pension? Pension contributions would be taxed pre-contributing (and the Chancellor receives the tax inflow now) with the pension, on maturity, being tax free (which also does away with the 'take the money and run' substitute for annuities).
For the US Person, it would require a total declaration of the individuals contributions, the employers contributions, plus the yearly growth to achieve a full basis in the pension. In reality, using the present as an example, most won't do that and would end up paying US tax instead of paying UK tax as they do now. For the individual, it might be a gain if tax rates stay relative one country to the other as they are now. Would the UK care, since the contributions have already been taxed? Nonetheless, it's the complications of living in one country which has definite ideas as to how to structure retirement versus also having to pay tax to a second country which defeats the intended result (tax free retirement). The downside is what would the UK view as reasonable to charge pensioners for (eldercare) if they are having a tax free retirement? Oops, possibly not everyone would have a tax free retirement.