2018 form il 1120 st-2025

1. Click ‘Get Form’ to open the 2018 Form IL-1120-ST in the editor.
2. Begin by entering your complete legal business name in Section A. Ensure that you also provide your federal employer identification number (FEIN) and check the box if there has been a name change.
3. Fill in your mailing address, including city, state, and ZIP code. If this is your first return or if you have an address change, check the appropriate boxes.
4. Proceed to Part II to calculate your ordinary income or loss. Enter amounts from federal Schedule K and other relevant sources as instructed.
5. Continue through the steps to figure your unmodified base income or loss, ensuring all calculations are accurate and follow the provided instructions for each line.
6. Finally, review all entries for accuracy before signing at the bottom of the form. Make sure to attach any required schedules and payment vouchers as necessary.

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