Hi, I came to US for my master degree in 2004 (F-1) and filed 1040-NR for 2004.
I was under F-1 visa status in 2005 and 2006, but I filed 1040 by mistake.
From Oct. 01, 2007, my status changed from F-1(OPT) to H-1B. As I worked as graduate assistant on campus in 2005 & 2006, the income was only $3,486 (2005) & $7,444 (2006), do you think I should correct my wrong tax filing for 2005 & 2006? As the 1040NR-EZ page 2 question I asks "the lastest year and form number" for tax return before 2007?
I guess IRS will find out I filed wrong forms in 2005 & 2006.

Another question is : why the country treaty is not included in the "taxable income"caculation? See the 1040NR-EZ, Line 6 is for "exampt by a treaty", but to caculate Line 14-:Taxable Income", line 6 is not deducted from the gross income.

Hope to hear from somebody soon!
Thanks!

The IRS will eventually dixcover the error.

You need to file Form 1040X and amend your 2005 and 2006 returns, attaching a properly-prepared Form 1040NR-EZ to the Form 1040X.