il-1040-schedule-1299-c.pdf

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Attached to
FY27-32 IL-1040 Data Entry Services - Invitation for Bid
Solicitation number
27-492DOR-ACCOU-B-52155
Issued by
St. Clair County, Illinois

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This is a tax form document from the Illinois Department of Revenue (IDOR) consisting of Schedule 1299-C, which is an attachment to Form IL-1040 for tax year 2025. The schedule is designed for individual taxpayers to report income tax subtractions and credits. The form is organized into three main steps: Step 1 requires taxpayers to calculate subtractions related to River Edge Redevelopment Zone dividends and High Impact Business within Foreign Trade Zone dividends; Step 2 contains worksheets for calculating specific tax credits including Research and Development credits, K-12 Instructional Materials and Supplies credits, and Adoption credits; and Step 3 guides taxpayers through determining their total income tax credit by comparing earned credits against their tax liability and managing credit carryforwards from prior years. All figures must be rounded to whole dollars, and taxpayers must provide necessary supporting documentation or face potential disallowance of claimed credits and processing delays.

The document serves as a comprehensive mechanism for Illinois individual taxpayers to claim eligible tax credits and subtractions authorized under the Illinois Income Tax Act. Taxpayers claiming Research and Development credits must complete a calculation based on the difference between base period average expenses and current year expenses multiplied by 6.5 percent. K-12 educators working 900 or more hours may claim up to $500 in qualified instructional materials and supplies expenses, while taxpayers with qualifying adoption expenses may claim adoption credits up to specified maximums per child. The form accommodates multiple credit types across multiple tax years with designated carryforward provisions, allowing credits to be applied over multiple years if they exceed the current year's tax liability. Form completion requires accurate identification of the taxpayer, proper categorization of credits by type and credit code, and detailed calculation of distributive shares for credits from pass-through entities.

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Read this information before completing this form:

Refer to Schedule 1299-I, Income Tax Credits Information and Worksheets, and Schedule 1299-C Instructions for information on how to complete this schedule. All figures should be rounded to whole dollars.

If you are carrying forward credits from a previous year, you must refer to your 2024 Schedule 1299-C, Step 3 to determine the amount of available credit carryforward that you may use on this 2025 Schedule 1299-C.

If you have more subtractions or credits than lines available, attach a separate schedule in the same format with all the required information.

Complete Step 3, Line 43 on this schedule only.

NOTE: If you do not provide the necessary information or attempt to claim a subtraction or credit which does not exist, you may receive correspondence from the Department, your subtraction or credit may be disallowed, and the processing of your return may be delayed.

Step 1: Figure your subtractions River Edge Redevelopment Zone Dividend Subtraction

ABC
Corporation’s nameName of zone Dividend amount
1a a
b b
c c
2Enter any distributive share of River Edge Redevelopment Zone Dividend Subtraction from partnerships,
S corporations, trusts, or estates. Attach Schedule(s) K-1-P or K-1-T.2
3Add Step 1, Column C, Lines 1a through 1c and Line 2, and enter the total here.3

High Impact Business within a Foreign Trade Zone (or sub-zone) Dividend Subtraction A B C

Corporation’s nameName of zone Dividend amount
4aa
b b
c c
5Enter any distributive share of High Impact Business within a ForeignTrade Zone (or sub-zone) Dividend
Subtraction from partnerships,S corporations, trusts, or estates.Attach Schedule(s) K-1-P or K-1-T.5
6Add Step 1, Column C, Lines 4a through 4c and Line 5, and enter the total here.6
7Add Step 1, Lines 3 and 6. Enter your total dividend subtraction here and on Schedule M, Line 24.7

Illinois Department of Revenue 2025 Schedule 1299-C Attach to your Form IL-1040. Check if attaching to Amended Form IL-1040-X.

Printed by authority of the state of Illinois. Electronic only, one copy. Page 1 of 3

IL Attachment No. 3

_____________________________________________________________ _____ _____ – _____ _____ – _____ _____ _____ _____
Your name as shown on Form IL-1040Your Social Security number

This form is authorized as outlined under the Illinois Income Tax Act. Disclosure of this information is required. Failure to provide information could result in a penalty.

*61612251W*

Schedule 1299-C (R-12/25)

Income Tax Subtractions and Credits (for individuals) For tax years ending on or after December 31, 2025.

Schedule 1299-C (R-12/25)

K-12 Instructional Materials and Supplies

Follow the instructions on this worksheet tocalculate the K-12 Instructional Materials and Supplies credit amount to enter in Step 3,
Column E, if you were a teacher, instructor, counselor, principal, or aide that worked 900 or more hours in a K-12 school in Illinois.
AB
Primary taxpayerSpouse

11 a Professional Educator License number, if applicable.

b School name (Illinois only).

c Total qualified expenses paid in 2025.

d Enter the lesser of Line 11c or $500.

12 Add Line 11d, Column A, and Line 11d, Column B.

Enter the result here and in Step 3, Column E on the line with “5” in Column A and Credit Code 5740 in Column B. 12

Adoption Follow the instructions on this worksheet to calculate the Adoption credit amount to enter in Step 3, Column E.

Part 1 - Adopted Child Information Identifying Birth IL Final

Child’s Name (first, last)NumberDate Residentin 2025
13 /

14 /

15 /

Part 2 - Figure your creditChild 1 Child 2Child 3
(Line 13)(Line 14)(Line 15)
16 aMaximum credit allowed
per child (see instructions).
bIL Adoption credit claimed
previously for this child.
cSubtract Line b from Line a.
dQualified adoption expenses
(see instructions).
eEnter the lesser of Line c or Line d.
fTotal amount of qualified adoption expenses from Line e.
gIllinois residents: Enter 1.0.

Nonresidents and part-year residents: Enter the decimal from Schedule NR, Line 48. .

h Multiply Line f by Line g. Enter the result here and in Step 3, Column E on the line with “5” in Column A and Credit Code 5780 in Column B. 16

Month Year

Month Year

*61612252W*

Month Year

Step 2: Worksheets (Complete this step only if you earned any of these income tax credits during your current tax year)

Research and Development

Follow the instructions on this worksheet to calculate the Research and Development credit amount to enter in Step 3, Column E.

A B

Base period avg. expenses This year’s expenses

8Enter the amounts from Schedule 1299-I, Line 6 of the Research and
Development Worksheet.8 8
9Subtract Line 8, Column A from Line 8, Column B. If negative, enter zero.9
10Multiply Line 9 by 6.5% (.065).
Enter the result hereand in Step 3, Column E on the line with “5” in Column A and

Credit Code 5340 in Column B. 10

Page 3 of 3Schedule 1299-C (R-12/25)

*61612253W*

Step 3: Figure your Income Tax Credit (Complete Step 2 first, if applicable) See Schedule 1299-C Instructions for how to complete this Step.

17Enter your income tax from Form IL-1040, Line 14.17_____________
18Add the credit amounts from Form IL-1040, Lines 15 and 16, and enter here.18_____________
19 Subtract Line 18 from Line 17. If the amount is zero or negative, enter zero. 19_____________
ABCDEFGHIJ
Years LeftCreditIL Tax YearIdentifying NumberCredit EarnedDistributiveTotalCalculationCreditCredit
to CarryCodeCredit Earnedor CarriedShare or TransferCreditAppliedCarryforward

20 Enter the amount from Line 19 here. 20 _____________

21_________________________________________________________________________________________________________________________
22_________________________________________________________________________________________________________________________
23_________________________________________________________________________________________________________________________
24_________________________________________________________________________________________________________________________
25_________________________________________________________________________________________________________________________
26_________________________________________________________________________________________________________________________
27_________________________________________________________________________________________________________________________
28_________________________________________________________________________________________________________________________
29_________________________________________________________________________________________________________________________
30_________________________________________________________________________________________________________________________
31_________________________________________________________________________________________________________________________
32_________________________________________________________________________________________________________________________
33_________________________________________________________________________________________________________________________
34_________________________________________________________________________________________________________________________
35_________________________________________________________________________________________________________________________
36_________________________________________________________________________________________________________________________
37_________________________________________________________________________________________________________________________
38_________________________________________________________________________________________________________________________
39_________________________________________________________________________________________________________________________
40_________________________________________________________________________________________________________________________
41_________________________________________________________________________________________________________________________
42 Add the amounts in Column I and enter the total here.42_____________
43Follow the Schedule 1299-C Instructions to determine the amount of credit you may claim this year. Enter the amount here and on your

Form IL-1040, Line 17. 43

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