Social and Medicare deduction after H1B visa approval or from Oct 1 ?

dipjyoti

New Member
My employer has started deducting the Social and Medicare taxes, after the H1B visa approval. But the change of status from F1 to H1B happens only from Oct 1 onwards (LCA date). So, won’t the Social and Medicare deductions be done from Oct 1 onwards ? or is it done after the visa approval notice from USCIS ? Can anyone please confirm this ?
 
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