Telephone Assistance for Individuals:
Toll-Free, 1-800-829-1040

Hours of Operation: Monday – Friday, 7:00 a.m. – 7:00 p.m. your local time (Alaska & Hawaii follow Pacific Time).

Telephone Assistance for Businesses:
Toll-Free, 1-800-829-4933

Hours of Operation: Monday – Friday, 7:00 a.m. – 7:00 p.m. your local time (Alaska & Hawaii follow Pacific Time).

Telephone Assistance for Exempt Organizations, Retirement Plan Administrators, and Government Entities:
Toll-Free, 1-877-829-5500

Hours of Operation: Monday – Friday,  8:00 a.m. to 5:00 p.m. Local Time.

Telephone Assistance for people with hearing impairments:
Toll-Free 1-800-829-4059 (TDD)
Hours of Operation: Monday – Friday, 7:00 a.m. – 7:00 p.m. your local time (Alaska & Hawaii follow Pacific Time).