Form 941 : Employer's Quarterly Federal Tax Return.
Form 941
Employers who withhold income taxes, social security tax, or Medicare tax from employee's paychecks or who must pay the employer's portion of social security or Medicare tax.
Use Form I-9 to verify the identity and employment authorization of individuals hired for employment in the United States. All U.S. employers must properly complete Form I-9 for each individual they hire for employment in the United States. This includes citizens and noncitizens. Both employees and employers (or authorized representatives of the employer) must complete the form.