I'm resurrecting this post just to see if anyone has any further updates?
I think I know some of the answers here to my questions, but just in case I'm being dumb, here goes:
I went through the streamlined process (successfully) in 2017 (filing 2014-2016 returns and 6 years of FBAR reporting) using UK Accountants who were also IRS appointed agents. Although I filed form 8833 and took the treaty based position on my pension contributions into my SIPP, I didn't file Forms 3520 or 3520-A.
I'm a Chartered Accountant myself and so in 2017 I prepared and filed my tax return on my own. At that time Rev. Proc. 2020-17 didn't exist anyway but I didn't file 3520 or 3520A. My total contributions in that year were $50,775 so $775 over the $50k threshold subsequently established by Rev. Proc. 2020-17.
My 2017 return hasn't been agreed yet (due to an unrelated CGT issue) and the IRS has not raised the issue of 3520 or 3520A - probably best to leave this alone now, unless someone has better advice about revisiting this return again (which would be my worst nightmare because of the on-going IRS questions on my CGT declaration on an employee share sale in that year).
Roll forward 3 years and I'm in the final throws of preparing my 2020 return and I already know that I have breached the $50k threshold established in Rev. Proc. 2020-17 due to a contribution made in February 2020 (before Rev. Proc. 2020-17 was published) - it now appears that I have to file both 3520 & 3520A.
Rev. Proc. 2020-17 doesn't really appear to go into any detail about the $50k annual limit - I'm filing jointly with my spouse - I suppose it would be naïve of me to just double the limit to $100k and ignore the filing of both forms?
The really worry for me now is that the deadline for filing (with the 6 month extension) - Form 3520 is 15th October. (which is fine) However a Foreign Trust is required to file From 3520A by September 15th (tomorrow!!). If the Foreign Trust does not file, then I can file a substitute 3520A and attach it to my 3520 and that will not be due until October 15th. I have to assume that my UK SIPP provider will not be filing a Form 3520A (I suspect that they barely know what one is
) - and I don't want to ask them as that will just be another can of worms - I told them I was a USC and it didn't seem to worry them at the time.
Final pain for me is that I use TAXACT software and they don't even appear to have forms 3520 or 3520A - so I have to do the whole thing manually - and presumably file it by mail to a different IRS address.
My head has started spinning with all of this - does anyone have experience of filing these forms when they relate to a SIPP?