IL prefers efile and there is no such rule that you must mail your return. In fact, IL says this in the instructions:
Almost all taxpayers can file electronically. Visit mytax.illinois.gov or see your tax professional. If you do not wish to file electronically, you may use the paper Form IL-1040.
IL hasn't finished and not all forms are finalized for print. Please check forms availability here. Select online, Windows, or Macintosh from the drop down menu. Whenever the federal and states change a form, we have to as well. This happens throughout tax season.
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