09/25/2026
If you own a single-member limited liability company (LLC), it's important to know which taxpayer identification number to use. For federal income tax, a disregarded single-member LLC generally uses the owner's Social Security number or the Employer Identification Number (EIN). However, if the LLC has employees or certain excise tax responsibilities, it must use its own EIN. Review the rules and learn when an EIN is required with at https://ow.ly/ywMw50ZB3mg