我个人更倾向于
A2: You've met the "substantial test" under the IRS rules and are considered as the Resident Alien for tax purpose. Therefore, you are no longer eligible for filing IRS form 843 to get your FICA taxes back.
我已经是R了,TA收入学校一直没有扣SS和Medicare,已经两年了。我不主动补交有什么坏处吗?盼望能永久赖掉这两年的税。