Posted by: Yakku September 11, 2012
Social Security/Medicare taxes
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It depends:  
If you are in F-1 for less than 5 years, you don't have to pay social security/medicare taxes.
BUT if you are in F-1 for more than 5 years
, then you have to pay social security/medicare taxes on your grad (teaching or research) assistance stipend or your income in OPT. 
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