Generally, foreign students in F-1, J-1, or M-1 nonimmigrant status who have been in the United States more than 5 calendar years become resident aliens for U.S. tax purpose if they meet the “Substantial Presence Test” and are liable for Social Security and Medicare taxes. (unless they are exempt from FICA under the "student FICA exemption". Foreign Student Liability for Social Security and Medicare Taxes
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