The Internal Revenue Service (IRS) provides assistance with federal tax information for businesses and the self-employed, including questions about federal tax forms, employee and payroll taxes, and business tax credits.

You can also get information about:

  • Employer ID numbers
  • Employment taxes
  • Small business and self-employed tax center
  • Small business events
  • Tax calendar
  • Tax credits and provisions

Online

Learn more about business taxes.

By Phone

  • Agency: United States Department of the Treasury
  • Division: Internal Revenue Service Business and Specialty Tax Line
  • Phone Number: (800) 829-4933
  • Business Hours: Mon - Fri: 7:00 AM - 7:00 PM
  • Staff is available through the automated phone system during business hours.