On stim 3 - I had filed my 1040 forms back on Feb 12 via mail prior to the third stimulus payment being approved by Congress. Today I was checking the status of my refund on the IRS "Where's My Refund" web page, as I have been doing daily for a while now, expecting to see a four- figure amount approved. Almost had a coronary to see online that they had recalculated the return and taxed all of my social security (which was exempt while I was living in the UK) and reduced my refund to a couple of hundred dollars. Of course, I immediately phoned the US IRS line (800-829-1040). Their recording said they were closed. As far as I know it is not a federal holiday, or any other holiday that would result in their office being closed. (Tried several times over a few hours.)
Then I tried the international line and finally got through to someone who listened when I told them what it was saying online about having recalculated to tax my social security for all of 2020 (and not just the few months I was back in the USA). I referenced the tax treaty for exclusion of SS taxation (Article 17.3). She put me on hold for quite some time and then came back and said she could fix that over the phone. (!!!!!!) And did so, apparently, with several apologies about the length of time it was taking. Was told I'd be getting the initially reduced amount direct deposit, then a subsequent adjustment that would bring the disbursement total up to what I had originally been due as far as an actual refund as I had calculated it.
I then explained that I had filed my forms prior to stim 3 being approved, and asked what I would need to do to get the remaining $1,400 I was due for my adult dependent payment. She said "nothing" and that a paper stim 3 check was to be mailed out to me this Friday. They were checking returns to see if payments had been made if due, and if not, they were mailing checks. And was there any other way they could be of help today?
I was starting to think I'd gotten a bogus person, some scam entity to whom I'd just given too much personal information - except that she knew the actual numbers I was talking about. I have never had such good customer service from the IRS. I really was expecting to have to file an amended return to get the stimulus payment, and to have to provide reams of documentation to get the SS back to the correct tax status. Nope.
The international callers number is 267-941-1000 in case that's of use to anyone.
Just a FYI.