26 U.S.C. § 3301 - U.S. Code - Unannotated Title 26. Internal Revenue Code § 3301. Rate of tax

There is hereby imposed on every employer (as defined in section 3306(a)) for each calendar year an excise tax, with respect to having individuals in his employ, equal to 6 percent of the total wages (as defined in section 3306(b)) paid by such employer during the calendar year with respect to employment (as defined in section 3306(c)).