il-income-tax

By openaccountants. Updated July 21, 2026. Categories: Payment.

> Illinois Individual Income Tax Return (Form IL-1040) for sole proprietors and single-member LLCs. Covers the flat 4.95% rate, Illinois base income computation from federal AGI, Schedule M addition and subtraction modifications, property tax credit (Schedule ICR), earned income credit, and the full return assembly. Primary source: 35 ILCS 5/.

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