Schedule IL-WIT (IL-1040)

This article explains what Schedule IL-WIT is and gives you complete, line-by-line instructions on how to fill it out correctly so you can report Illinois income tax withheld from your W-2 and 1099 forms on your Illinois individual tax return (Form IL-1040).

Schedule IL-WIT, officially titled “Illinois Income Tax Withheld,” is a supplemental form used by Illinois taxpayers to report all state income tax withholding shown on their W-2, 1099, and similar forms. It’s an attachment to your Form IL-1040, ensuring that every dollar of Illinois tax withheld from your earnings, winnings, or other payments is properly credited toward your total tax liability.

This form serves as your proof of withholding and directly supports Line 25 on your IL-1040. You must list each W-2 and 1099 form that includes Illinois state withholding. It’s required for both you and your spouse if you’re filing a joint return.

Common examples of forms to report include:

  • W-2: Wages and salaries from employers.
  • 1099-R: Pensions and annuities.
  • 1099-G: Government payments, like unemployment compensation.
  • 1099-NEC or 1099-MISC: Nonemployee or freelance income.
  • W-2G: Gambling winnings.
  • 1099-DIV, 1099-INT, or 1099-B: Investment income with Illinois withholding.

If you have more than five withholding forms, you must attach additional copies of Schedule IL-WIT. Missing or incomplete IL-WIT information can delay your refund or cause your withholding to be disallowed until verified.

How To File Schedule IL-WIT

  1. Complete your W-2 and 1099 information before starting the form.
  2. Attach Schedule IL-WIT to your Form IL-1040 when you file.
  3. Include all withholding documentation (W-2s, 1099s, etc.).
  4. If you are filing an amended return, check the box indicating it’s attached to Form IL-1040-X.
  5. Use whole dollar amounts only (no cents).
  6. E-file whenever possible — this automatically transfers withholding data correctly and avoids manual entry errors.
How To Complete Schedule IL-WIT (IL-1040)

How To Complete Schedule IL-WIT (IL-1040)

Form Reference Chart

Before starting, review the reference chart on the top of the form.
Each type of form you report in Column A must use its correct letter code:

Form TypeLetter CodeForm TypeLetter Code
W-2W1099-DIVD
W-2GWG1099-INTI
1099-RR1042-SS
1099-GG1099-BB
1099-MISCM1099-KK
1099-OIDO1099-NECN

You’ll use these letter codes in Column A when listing your withholding records.

Step 1: Provide Your Withholding Records

This step covers your personal income and withholding information. Use this section to list every W-2 or 1099 that reports Illinois state tax withheld.

At the top of Step 1:
Enter your name and Social Security Number exactly as they appear on your Form IL-1040.

Now complete each column (A–E) for Lines 1–5:

  • Column A – Form Type:
    Enter the letter code (e.g., W, R, N, G) corresponding to the type of form from the chart above.
  • Column B – Employer/Payer Identification Number:
    Copy the Federal Employer Identification Number (FEIN) or Payer ID from your W-2 or 1099 form.
  • Column C – Federal Wages, Winnings, Gross Distributions, Compensation, etc.:
    Enter the federal total amount reported on the form — for example, the total wages or payments before deductions.
  • Column D – Illinois Wages, Winnings, Gross Distributions, Compensation, etc.:
    Enter the portion of your federal income that applies to Illinois (often the same as Column C for full-year residents).
  • Column E – Illinois Income Tax Withheld:
    Enter the amount of Illinois income tax withheld, as shown on the W-2 or 1099 form. This column is the most important — it determines the total tax credit you’ll receive.

➡ If you have more than five forms, complete additional copies of Schedule IL-WIT and continue numbering sequentially.

Step 2: Provide Spouse’s Withholding Records

If you’re filing married filing jointly, list your spouse’s withholding information separately in this section.

At the top of Step 2:
Enter your spouse’s name and Social Security Number as shown on your Form IL-1040.

Then, for Lines 6–10, repeat the same structure as in Step 1:

  • Column A: Use the correct letter code for the form type.
  • Column B: Enter the employer or payer’s identification number.
  • Column C: Federal wages, winnings, or distributions.
  • Column D: Illinois-specific wages, winnings, or distributions.
  • Column E: Illinois income tax withheld.

➡ If your spouse has more than five forms, attach another copy of Schedule IL-WIT.

Step 3: Total Illinois Withholding

Line 11:
Add all the Column E amounts from Lines 1 through 10 — and from any additional IL-WIT schedules you attach.

This total represents your combined Illinois income tax withheld for you (and your spouse, if applicable).

  • Enter this amount on Line 11 of Schedule IL-WIT.
  • Then, carry the same total to Form IL-1040, Line 25.

Important: Attach all copies of Schedule IL-WIT and every W-2 or 1099 form that shows Illinois withholding.

Important Filing Tips

  • Attach all documents. Failing to include your W-2s or 1099s may cause Illinois to reject or delay your withholding credit.
  • Use whole dollar amounts. Do not include cents anywhere on the form.
  • Round correctly. Round up if 50¢ or more, round down if less.
  • Check your math carefully. Ensure your totals match your IL-1040 entries.
  • File electronically. E-filing automatically includes withholding details and prevents data entry errors.
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