Yes, your L1 income in the U.S. is subject to FICA taxes as well as income taxes. Your employer must have withheld taxes from your paycheck.
You must file 2006 and 2007 returns as nonresident declaring only the U.S. income. You may owe taxes or may have a refund. It will be clear only after you complete your tax return. If you owe any tax, you will pay interest and penalty.
Now about "I paid taxes in home country India". Please explain. If you reported the U.S. income in India, you should get credit for taxes paid in the U.S. That means from the tax amount, you deduct the tax paid in the U.S.
You can contact me at
![[email address]](http://www.askmehelpdesk.com/?emailimage=460a8dc0e303f60af8396f94b89ec4a9)