Hi,
I'm sorry to resurrect this thread but I'm in an almost identical position to Starfrog and am trying to understand the whole process. I didn't feel as if the question was answered definitively. The main difference between myself and Starfrog is that mine is a plain ol' 401k - I didn't convert to an IRA when I left the US company. I'm clearly not a tax expert, but I'm having a hard time understanding why HMRC would need to be told about a foreign pension plan that's just sat there accruing. I CAN understand that they may want a piece of it when I take the lump sum distribution when I'm 59.5. I'm finding some of the answers here a little disturbing - talk of tax and penalties - so please correct me if I've got the wrong end of the stick. Are you saying that not only do the US want to tax me 30% when I take my distribution, but that HMRC want to tax me while it's accruing? That seems perverse. If it is the case, what money would I use to pay the tax I currently owe HMRC?