W-8, W8-B, W9, and W9-B forms require the employee's SSN, ITIN, or Social Security Number. You must have an SSN or ITIN. Form W8, W8-B, W9, and W9-B forms may be used to certify that the employee is not currently working on government projects on top of employment that is expected to last more than a year. The certification issued will expire after one calendar year. You may obtain Form W8-B, W9, or W9-B before the certification expires. Form W9, commonly referred to as a “Certificate of Compliance,” may be used by the employer to obtain an Employer Identification Number (EIN). If you are on a student grant or have worked on a student grant. Form W9 will certify that for all employment, except certain work in the event of your death as long as the work has no duration of more than one year, the employee is currently an active student of the University of South Florida. This form can also be used to apply for an Individual Taxpayer Identification Number (ITIN). If you are eligible for the IRS ETC or additional Child Tax Credit benefits. You may also qualify for an ETC credit.