When submitting a W-4, what should employers include on line 10?

When submitting a W-4, employers are required to include the Employer Identification Number (EIN) on line 10. The EIN is a unique identifier assigned by the IRS used to identify the business for tax purposes. This number is essential for the IRS to correctly associate the submitted W-4 with the specific employer, ensuring that the tax information is processed accurately.

In contrast, the employee's ID number or Social Security Number is generally not included on the W-4 form since the purpose of this line specifically pertains to identifying the employer. Mentioning the employee's monthly salary is also inappropriate because the W-4 is primarily concerned with the withholding allowances and exemptions claimed by the employee, rather than detailing their salary. Therefore, including the EIN is crucial for proper tracking and management of payroll taxes associated with the employee's income.