I was thinking some more about this today. WEP is primarily aimed at US residents who worked for US employers who were exempt from paying into SS (FICA), and also provided a final salary pension scheme. It is possible that these FICA exempt employers also provided a DC plan such as a 401k, which is what my company did, although it also paid into FICA.
If you did work for an organization that did not pay FICA but had a DC plan, is that plan also considered when evaluating WEP?
As I stated above, my wife applied for SS through the FBU at the US Embassy in London and she was told that it is when you actually start receiving the foreign pension that WEP is applied, and that is what happened with her OAP but I’m sure it would also happen with a UK private pension. She also completed SSA form 308, which she sent to the FBU in London, and on that form it does ask for the date you become eligible for a pension but not the amount and then also the date and amount of the pension when you start receiving it. So I still don’t know for certain. I know that I was eligible for my UK pensions long before I chose to receive them because the longer I waited the more it was.