Telephone numbers: Indiana Department of Revenue. Department of Workforce Development.

Department of Revenue. Registering to do business in Indiana.

State Withholding Tax Forms.

Business Tax Application form to download and fill in interactively via Adobe Acrobat. Complete, print, and mail the form to the address on the form.

Form It-35A, tax registration form for Indiana non-profits

Unemployment Insurance Report to Determine Status. Form 2837 is required of all Indiana employers. Print, complete, and mail to the address on the form.

Department of Workforce Development, Employers section: employers guide, unemployment insurance, unemployment tax information.

Change of address form for the Indiana Department of Workforce Development.

New hire reporting online.