1) If you are single, you should file Form 1040NR. If you are married, Form 1040 is an option for you.
2) The treaty exemption is for earned income, so you will be able to claim it for 2006.
3) For 2007 and beyond, the treaty exemption will apply only if you continue to file as a non-resident alien (Form 1040NR). If you file Form 1040, the treaty exemption does NOT apply.
Which state do you live in? The reason is that state and local income taxes are deductible as an itemized deduction. That is in addition to the $5,000 treaty exemption.
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