OK, I am reading through everything again this morning and I think I understand things, so I would like to thank everyone again for their patience and help.
I understand the difference between invoking the treaty and just paying tax on employer + employee contributions, and I would like to take the route where I pay tax on them. I know that for some reason the employer contributions do not count as "earned income" (although I am pretty sure if I stopped work my employer would stop paying them
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So I will put "See attached" on line 21 of my 1040 and include a seperate page where I add up the value of the employer contributions, (labelled "Employer contributions to UK pension, University Superannuation Scheme") and the negative 2555ez foreign earned income exclusion (my gross salary including the 6%). This will leave me with some taxable income but it will be under the limit. In future years I will use the tax credits rather than 2555ez. It is my responsibility to keep records of this to prove at retirement how much of the pension is US-tax paid.
Is there a better / more official way to include multiple items inline 21?
What I am still unclear on is the issue of accrued benefits... For example:
You are required under code section 402(b) to enter the vested accrued benefit of the plan each year. This is a legal obligation and is not optional.
Where and how do I need to report this (form 3520?)? Is the value of 23/80 x salary (captial value as indicated in the USS prospectus) acceptable or do I need to find and use an IRS multiplier?
If its possible to declare and pay (offset with tax credits) tax on the full accrued benefit so the entire pension is US tax free that seems like a good idea. But how to do that in practise? I would need to somehow exclude the employer + employee contributions and put the acrued benefit (to avoid being taxed twice on both contributions and accrued benefit)? Or do the employer + employee contributions as above and add further income of [23/80*salary - (employer+employee contributions)]?
Or is this a mistake and the best one can do is taxing the contributions and the gains must be calculated at the start of retirement?