1. Not likely. If you filed tax returns 1040NR for any taxable income during your non-resident alien period, you are in good shape. Your tax status has now changed to resident alien.
2. Retroactive taxes are to file tax returns and report income not reported during your first two years.
3. If you did erroneously file for treaty exemption, you should file amended returns.
PK is the true expert here so please reply with your country so we can better assist you.
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