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).