I've recently had a talk with a buddy of mine who works in IT. He says he's trying to get a working for home job in the states, because wages are so much higher here.

He claims it's not impossible since there are much more wfh jobs since Covid and he's great in his field (his words). Also, he is aiming for a wage that might be low for US standards, but still high compared to Belgian wages. This would make him competitive compared to native workers.

He didn't seem to know how the whole tax system would work. Hence the questions in the title. How realistic is this? How would it work and what would be the cons? Does it count for pensions?