@anomymous ,
(a) please confirm that your EAD actually allows you to work as 1099 -- non-employee /contractor. Generally OPT is focused on a specific training entity ( where you are a trainee and not employee).
(b) your tax-home while in the US is US and not your home country. You will be taxed as a US person but generally no FICA ( as a trainee / student).
Which country are from? Are you attached to an university/college for your F-1 ?
Is there more I can do for you ?
