Retirement tax questions

Makntak, 

While I am also trying to figure this out, I have a question for you.  I started receiving UK State pension in 2020.  Did you receive a tax document from the UK that you will use on your USA tax return? I haven't received anything and have submitted a question to them but response was they would get back to me within 4 weeks. Any help on what you received from UK would be helpful. thanks.