Follow the steps to complete the IL DoR Schedule 1299-C online.

1. Click ‘Get Form’ button to obtain the form and open it in the document editor.
2. Enter your name as shown on Form IL-1040 in the designated field as the first piece of information required. Then, input your Social Security number in the next section.
3. Refer to the information provided about completing the form. Review the instructions from Schedule 1299-I and prepare your figures rounded to whole dollars.
4. In Step 1, calculate your subtractions by filling in any River Edge Redevelopment Zone Dividend Subtraction details—this includes columns for the corporation's name, name of the zone, and the dividend amount.
5. Continue to the High Impact Business within a Foreign Trade Zone (or sub-zone) Dividend Subtraction section, completing the required fields similar to the previous step.
6. After completing Step 1, sum the totals for Line 3 and Line 6, and enter this on Line 7, reflecting your total dividend subtraction, which should also be referenced on Schedule M.
7. Proceed to Step 2, where you will use worksheets to calculate income tax credits—follow the instructions closely for each type of credit you are claiming, such as Research and Development, Instructional Materials and Supplies, and Adoption.
8. Complete Step 3 by entering your income tax from Form IL-1040, Line 14. Calculate your allowable credits and enter them as instructed, ensuring accuracy throughout the process.
9. Once all entries are made, review all sections carefully for completeness and accuracy. Make necessary adjustments if required.
10. Finally, you may download, print, or share the completed form as per your filing preferences, ensuring you save a copy for your records.

Complete your IL DoR Schedule 1299-C online today to ensure you claim all eligible subtractions and credits.