No, it's not TurboTax rejecting your e-filed tax return, it's the state of Illinois.
According to the instructions for Schedule 1299-C, to claim this subtraction, you must attach one of the following:
- Schedule(s) K-1-P, Partner’s or Shareholder’s Share of Income, Deductions, Credits, and Recapture, received from a partnership or S-Corporation
- Schedule(s) K-1-T, Beneficiary’s Share of Income and Deductions
- Certificates issued by the Department of Commerce and Economic Opportunity (DCEO)
- Certificates issued by the Illinois Department of Natural Resources (DNR)
- Certificates issued by the Illinois Department of Agriculture (IDOA)
- Certificates issued by the Illinois Department of Human Services (DHS)
- Any other documents, including transfer documentation, required by the Illinois Department of Revenue (IDOR) and noted in these instructions or Schedule 1299-I.
Since only the Schedules K-1 can be attached to the e-filed return, that is what is needed to e-file your Illinois tax return.
If you believe you have properly prepared your tax return and provided all the needed documentation, you can print, sign and mail in your state tax return.
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