but for 2007's w-2, it should get in 2008,

Because they didnt withhold my federal income tax, so I think I had better pay estimated tax when this quarter ends (about March),

I just worry about SST and Medicare tax, for 2003, I had been in F-1 status for 3 years, but right now I am holding H-1, although I received money in 2007 but it was for 2003 payroll, Should I avoid SST and Medicare tax for this money i received today? Thanks so much!