Thanks again for your help.

As I already filed 2006 returns, I think I have to amend my returns, If yes, do I need to amend 2006 return with 1040x form?

I have gone through 1040x form, where should I disclose my income and my wife's income? I didn't see any such column to fill worldwide income in 1040x form.

Do I need Form-16 (India Income Statement)original to show my worldwide income?

Thanks for your help.