As of 8:00am PDT, May 11, 2020
Practitioner Priority Service (866-860-4259): OPEN
Individual ACS (800-829-7650): OPEN
Business ACS (800-829-3903): OPEN
Main taxpayer assistance line (800-829-1040): CLOSED
Business/Specialty Tax Line (800-829-4933): CLOSED
Tax Exempt/Government Entities hotline (877-829-5500): CLOSED
e-Services Help Desk (866-255-0654): OPEN
Centralized Lien Unit (800-913-6050): OPEN
CAF Units are still closed.