Illinois Department of Revenue
Electronic Services

Modernized e-File (MeF)


MeF News

  • Illinois is now accepting Business Income Tax MeF for tax years 2013, 2012, and 2011 for the following returns
    • 2013 IL-1120 (including unitary), IL-1120-ST (not including unitary) and IL-1065 (not including unitary), and this Spring 2014, we will add the 2013 IL-1041
    • 2012 IL-1120 (including unitary), IL-1120-ST (not including unitary) and IL-1065 (not including unitary)
    • 2011 IL-1120 (including unitary), IL-1120-ST (not including unitary),
  • Effective July 1, 2013, business income tax filers with tax types included in MeF will have access to some features of MyTax Illinois, IDOR’s new online return filing and account management system.  Features available to these filers include account management and electronic payment options as well as limited viewing and printing of business income tax returns. Service through MeF will not be interrupted. See Informational Bulletin FY 2013-14 for more information.

General Information

The Illinois Department of Revenue (IDOR) , in conjunction with the Internal Revenue Service (IRS), accepts electronically filed business income tax and individual income tax returns as part of the IRS Modernized e-File (MeF) Program. MeF is a web-based system that allows electronic filing of tax returns through the Internet. MeF uses the widely accepted Extensible Markup Language (XML) format.

Linked (combined) federal/state filings and unlinked (state-only or state standalone) returns, along with payments (estimated payment(s), extension and tax payments) are allowed to be filed through MeF. The Illinois MeF program will accept and process three years of business income tax returns on a rolling calendar basis. Presently, the Illinois MeF program for individual income tax will only accept and process the current year IL-1040.

All entities wishing to participate must register with the IRS and be accepted in order to participate in MeF. Software developers are required to register and test their product with IDOR. Software developers for business income tax MeF must register with IDOR using Form IL-8633-B, Business Electronic Filing Enrollment. Software developers for individual income tax MeF must register with IDOR using Form IL-8633-I, Application to File Illinois Individual Income Tax Returns Electronically for Software Developers.

For additional information on business income tax MeF see BTR-36, Implementation Guide for Business Income Tax Federal/State Electronic Filing Program and for information on what forms/schedules are currently accepted see MeF Form/Schedule.




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