In complying with a 1997 regulation, the USCIS revised the I-9 form removing five documents as acceptable and adding one new document that an employer may accept as proof of an employee's identity and employment eligibility. Additionally, the new I-9 form no longer requires employees to provide their Social Security Number if their employer participates in the Department of Homeland Security's E-Verify program, which is the DHS's electronic employment eligibility verification system.
USCIS is encouraging employers to start using the new I-9 form immediately for all new employees although it is not required until December 26, 2007. Employers using the old form after that date may be subject to penalties and fines. Employers do not need to complete a new I-9 form for current employees with proper authentication. However, the new form should be used if re-verification of employment eligibility is required. The new I-9 form is available at: http://www.uscis.gov/files/form/i-9.pdf and a useful fact sheet regarding the new I-9 is available at: http://www.uscis.gov/files/pressrelease/FormI9FS110707.pdf.