Final answer:
To request a ruling on a worker's status, Form SS-8 should be used. This form is specifically for the IRS to determine if a worker is an employee or an independent contractor. The other forms listed are used for different tax-related purposes.
Step-by-step explanation:
If an employer (ER) or employee (EE) desires a ruling on a worker's status, the form that would be used is Form SS-8, Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding. This form is specifically designed to allow the Internal Revenue Service (IRS) to determine if a worker should be classified as an employee or as an independent contractor. While Form W-4 is used by employees to determine their tax withholding, Form 2441 is for child and dependent care expenses, and Form 8109 was used for tax deposit coupons but has been discontinued. Therefore, Form SS-8 is the appropriate form for requesting a ruling on employment status.