Which form does the IRS send to an employer for a federal tax levy?

The IRS utilizes Form 668-W (Notice of Levy on Wages, Salary, and Other Income) to notify an employer when there is a federal tax levy in effect. This form is critical because it provides the employer with the necessary instructions on how to withhold the specified amounts from an employee's wages and remit those amounts to the IRS.

Form 668-W is specifically designed for this purpose and includes the details needed for compliance. The distinction between the 4 part and 6 part versions pertains to how the form is structured, with the 6 part version being the standard used in most cases to ensure that sufficient copies are available for distribution to both the employer and the IRS.

The choice of the 6 part version reflects the need for multiple copies for record-keeping and communication purposes, which can help ensure all parties are aware of the levy and its requirements. This makes it the correct answer as it meets the needs of the IRS in a tax levy situation, ensuring clarity and compliance on the employer's end.