1120-IL ELF: Forms supported for electronic filing

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The following forms / schedules are supported for electronic filing with the application, C Corporations:

  • IL-1120
  • Estimate payments
  • IL-4562
  • IL-477
  • Extension payments
  • IL-2220
  • Schedule K-1-P
  • Schedule K-1-T
  • Schedule J
  • Schedule M
  • Schedule NB
  • Schedule NLD
  • Schedule UB
  • Schedule UB/NLD
  • Schedule 1299-B
  • Schedule 1299-D
  • Schedule 80/20
Note: Form IL-2220 is only supported for underpayment of estimated tax.

The following forms / schedules are supported for electronic filing with the application, S Corporations:

  • IL-1120-ST
  • Prepayments
  • IL-4562
  • IL-477
  • Extensions
  • Schedule K-1-P
  • Schedule K-1-T
  • Schedule B
  • Schedule M
  • Schedule NB
  • Schedule NLD
  • Schedule 1299-A
  • Schedule 80/20

Related topic: 1120 Illinois frequently asked questions

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