Note: Business income tax filers with tax types included in MeF have access to some features of MyTax Illinois, IDOR’s online return filing and account management system. Features available include account management and electronic payment options as well as limited viewing and printing of business income tax returns.
Illinois is now accepting Business Income Tax E-File for tax years 2013, 2012 and 2011.
BIT E-File Mandate: http://tax.illinois.gov/LegalInformation/regs/part760/760-100.pdf - Beginning with returns required to be filed for taxable years ending on or after December 31, 2011, any taxpayer required to file its federal income tax return by electronic means is required to file its equivalent Illinois income tax return for the same taxable year by electronic means. This subsection (c)(4) does not require electronic filing of amended returns or of returns of individuals or estates, or to any return the Department has announced cannot be filed by electronic means.
In the event that you are required to file electronically for federal purposes and the Illinois MeF program does not support your return type, you are exempt from the requirement until such a time that we are prepared to include your return type (i.e., partnerships, trusts and estates, exempt organizations, composite returns, pass-through entities). Illinois MeF does not support any amended returns. Therefore, these returns are exempt from the new requirements.