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@shreyanshbothra1217 wrote:

@Opus 17 Thanks for the reply.

Yes, I did file tax return for 2021. 
So I will go ahead and file 1040 NR. 

For FICA refund, can I submit Form 843 and ask for refund?


Form 843 is the correct form but I don't know if you are eligible.  I would like another expert to comment.  

https://www.irs.gov/individuals/international-taxpayers/aliens-employed-in-the-us-social-security-ta...