| You can't. Only funds held in a "qualified plan" can be rolled into a new employer's 401k, and there are no foreign qualified plans. (Unless you work for a foreign branch of a US company.)
You did not specify if you are a US citizen or not. In either case, you have a "basis" in the UK plan. If you're a US citizen, your basis is the amount of money you contributed and the yearly earnings within the plan that were included on your tax return. (Amounts must be converted using the rates in effect when the contributions were made/earnings posted.) If you aren't a citizen, your basis is the fair market value of the plan assets on the day you became a US resident for tax purposes (got a green card or met the substantial presence test). When you finally start pulling money out of the UK pension, you can exclude some of it from your US income & claim a foreign tax credit on the taxable portion.
You should also check the UK tax treaty to see if there is special tax treatment of foreign pensions.
BTW, if you haven't saved every statement from the pension plan, start gathering duplicates now while it's still relatively easy.
You should also check the totalization agreement with the UK ([url]www.ssa.gov[/url], I believe.)
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This post does not constitute legal advice, nor does it create an attorney-client relationship. Postings are based only on the information provided and you should consult an attorney in your area before relying on information contained in this post.
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