My consultancy is running my H1 payroll from the last two months...They have paid only OASDI and Medicare tax but not the Federal and State tax. Do I need to pay these federal and state tax also?? If I did not pay these tax right now do I need to pay later when I file the tax return???Does anybody have any idea???? Please suggest...That would be appreciated...
Thanx in advance.

yes you do, Tax and Death are inevitable, Depending upon states you may not have to pay state tax but Federal is must.

You have to pay it while filing for tax return this year.