I am a J-1 research scholar. I haven't paid federal taxes by claiming US-France tax treaty for 2 years. Now, I am at the end of my first 2 years period and extended my J-1 status. In the future, by marriage, I will adjust my status. Some people say that I have to pay the federal taxes that I haven't paid until now because I extend my stay. Some other people say, it is not necessary to do so. DO you have an idea about my status? Thanks a lot.