Upon hiring, what documents must all new employees provide their employer?

When hiring new employees, the essential documents they must provide include the Social Security card and the W-4 form. The Social Security card confirms the employee's eligibility to work in the United States and verifies their Social Security Number, which is important for tax reporting purposes.

The W-4 form is critical as it informs the employer about the employee's tax withholding preferences, such as the number of allowances claimed. This ensures the correct amount of federal income tax is withheld from the employee's paychecks.

While other options mention various documents, they do not encompass the necessary forms that new hires are required to submit to comply with federal regulations directly related to taxation and employment eligibility. Therefore, the combination of the Social Security card and the W-4 form is what new employees must provide to their employers upon hiring.