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Step 3 - Base Income

Line 5

Social Security benefits and certain retirement plans

Enter the amount of federally taxed Social Security and retirement income included in your adjusted gross income on Form IL-1040, Line 1 that you received from

  • qualified employee benefit plans (including railroad retirement and 401(K) plans) and Individual Retirement Accounts or self-employed retirement plans reported on federal Form 1040 or 1040-SR, Line 4b and 5b.
  • Social Security and railroad retirement benefits reported on federal Form 1040 or 1040-SR, Line 6b.
  • government retirement and government disability plans and group term life insurance premiums paid by a qualified retirement plan reported as wages on your federal Form 1040 or 1040-SR, Line 1z.
  • state or local government deferred compensation plans reported on federal Form 1040 or 1040-SR, Line 1z and 5b.
  • certain capital gains on employer securities reported on federal Form 1040 or 1040-SR, Line 7.
  • certain retirement payments made directly to retired partners reported on federal Form 1040 or 1040-SR, Schedule 1, Line 5.

Note: Your beneficiary share of payments from certain retirement plans and retirement payments to retired partners reported on Schedule K-1-T, Beneficiary’s Share of Income and Deductions, should not be included on Line 5. For more information, see the Schedule M Instructions. See Publication 120 for detailed information about what retirement income you may subtract.

Attach: Federal Form 1040 or 1040-SR, Page 1 and Schedule 1, and any W-2 and 1099 forms. If your retirement income is not reported on your federal Form 1040 or 1040-SR, Lines 4b, 5b, or 6b, or shown on your W-2 and 1099 forms, see Publication 120 for a list of any additional required attachments.

Line 6

Illinois Income Tax overpayment

Enter the total amount of any Illinois Income Tax overpayment (including any amount that was credited to another tax liability) and 2022 Illinois income tax or property tax rebate that you received in 2023 and was reported as income on your 2023 federal Form 1040 or 1040-SR, Schedule 1, Line 1. Do not include other states’ refunds on this line.

Line 7

Other subtractions

You may be entitled to subtract other items from your income. See the instructions for Schedule M to see if you are eligible for other subtractions.

Attach: Schedule M and any required supporting documents.

Line 9

Base income

This line may not be less than zero. If the result is a negative number, enter “zero.”