I don't think it was answered completely. I read that when you apply for disability the SSA is notified of any wages you have made in a totalization agreement country. The wages in the totalization agreement country can be combined with U.S wages to get a U.S benefit. It says once you are approved that the benefit in the U.S wouldn't increase by additional wages worked in a totalization country. It sounds like once your are approved the notification between the two countries stops. You can apply for a disability benefit in the totalization country after applying for SSDI in the U.S. It would be helpful to clarify if additional wages in a totalization country would increase the benefit in the U.S and how they account for this. Also, I don't know if the SSA or the IRS is notified of wages worked in a totalization country any times you do not apply for benefits. I'm wondering if a CDR review also triggers this or if there is any communication between the two countries.What country?
The question was answered "in general" in the IRS link I provided.
In general I would like to know how the IRS handles people working overseas. If you can add more than that feel free.