As long as I've been at this I should know the answer, but I've been trying to get those brain cells to file for a week now (and done some searches here) and just can't dredge the info up.
I have, besides some more liquid assets, four sources of retirement income: 1) US Social Security; 2) a pension from a state university in the USA; 3) a small 403b account; and, 4) a small DCP account with Fidelity set up by my employer during a period where they could not actually pay all my salary. I'm currently only drawing from 1&2.
Tax issues:
1 & 2) I know that if I was in the UK, due to the tax treaty, my SS income above the standard personal allowance there would be taxable at the rates of whichever of the countries (Scotland, England, etc.) I lived in and not taxable in the USA at all. So no problems there. Via the tax treaty, my state university pension was considered exempt by HMRC when I was living there last, so I assume that would not have changed. (I hope?) It would be fully taxable to the IRS.
3) My 403b investments are currently rolling tax free in the USA, but I will have to start taking minimum distributions in a couple of years. I am a little confused about retirement tax-free lump sum allowances (from the UK's side of taxes) vs just arranging a quarterly payment. If I were to end up in the UK again, would it be better to try to move the 403b to a UK retirement scheme entirely (if so, can you recommend one I can look at?) or take a quarter of it up front and then just have smaller periodic payments later on that would be taxable to the UK? Alternately, would it be better to move it to a traditional IRA before moving to the UK? I assume the difference between a 403b and an IRA is negligible to HMRC? (It's too late for me to do a Roth, as I'm not employed, so that option is out.)
4) The deferred compensation plan. The Uni put that money aside for me when they could not actually pay my full salary during a budget crisis. So it's actually my salary from the 1990s that's been sitting in a pot gaining interest income. Would the UK tax that as income for the year in which I start taking it out of the plan, or would they only tax interest accrued, or....?
Just trying to make sure I have my ducks in a row again, in case. Thanks.
PS Are the proceeds of US government EE savings bonds taxable in the UK?