The Internal Revenue Service publishes its telephone assistance number for businesses, along with contract information for individuals, exempt organizations, retirement plan administrators and government entities, on IRS.gov. As of July 2015, telephone assistance is available from 7 a.m. to 7 p.m. local time. according to the IRS.
The IRS' telephone assistance number for businesses serves corporations, partnerships and trusts and provides information on employer identification numbers, filing various tax returns and making tax deposits, according to the agency. The IRS also provides direct contact information for its e-Help Desk, which assists with issues relating to e-file, online registration and other online tools. Additionally, the agency provides dedicated telephone lines for individuals with hearing impairments as well as a Practitioner Priority Service for tax professionals acting on clients' behalf.