Illinois Schedule IL-WIT – Illinois Income Tax Withheld (2026)
Last reviewed: 2025-11-07
Use the Illinois Tax Form Calculator Schedule IL-WIT: Illinois Income Tax Withheld as a stand alone tax form calculator to quickly calculate specific amounts for your 2026 Illinois state tax return. Alternatively, you can use one of our Combined Federal and State Tax Estimators to quickly calculate your salary, tax, and take-home pay.
Schedule IL-WIT is used to verify and reconcile Illinois income tax withheld as reported on your Form IL-1040. It summarizes withholding from wages (Forms W-2), pensions (Forms 1099-R), and pass-through income (Schedules K-1-P or K-1-T). This ensures the total Illinois tax withheld matches Department of Revenue records and properly credits your return.
When to File Schedule IL-WIT
Attach Schedule IL-WIT if you:
- Report Illinois income tax withheld from multiple sources, such as wages, pensions, or partnership income.
- Are claiming Illinois withholding shown on K-1-P, K-1-T, or 1099 forms.
- Need to reconcile withholding that does not appear on your W-2 due to amended reporting or adjustments.
Completing Schedule IL-WIT
- Enter each source of Illinois income and the corresponding amount withheld.
- List W-2, 1099, K-1-P, and K-1-T amounts separately for transparency.
- Total all withholding and ensure it matches Line 25 of Form IL-1040.
- If the total withholding exceeds the calculated tax liability, the overpayment is eligible for refund.
Each entry should include the payer’s name, FEIN, income type, and amount withheld. The total is used to calculate your Illinois tax balance or refund due.
| 1 | W-2 withholding from Illinois employers | |
| 2 | 1099-R withholding (pensions, annuities) | |
| 3 | K-1-P or K-1-T withholding from pass-through entities | |
| 4 | Other Illinois income tax withheld | |
| 5 | Total Illinois income tax withheld (sum of Lines 1–4) | |
| 6 | Total Illinois tax liability (from IL-1040) | |
| 7 | Balance due or (overpayment): Line 6 − Line 5 |
Example
Example: You worked for two employers and received a pension distribution. Employer A withheld $2,400, Employer B withheld $1,600, and your pension provider withheld $500. Your total Illinois tax withheld is $4,500. This total appears on Schedule IL-WIT Line 5 and is carried to Form IL-1040 Line 25.
Why Schedule IL-WIT Matters
Schedule IL-WIT protects you against under-crediting or disallowance of withholding. The Illinois Department of Revenue uses this form to match each withholding record to its corresponding payer, preventing refund delays or notices of discrepancy. It’s particularly valuable for taxpayers with complex income sources or those claiming withholding from partnerships or trusts.
Tips
- Ensure all SSNs and FEINs match the source documents.
- Do not include federal withholding; only Illinois state withholding applies here.
- Attach copies of all W-2s, 1099-Rs, and K-1s showing Illinois withholding.
- If you have Illinois and another state’s withholding, report each separately using Schedule 1299-DA for credits.
Last reviewed: 2025-11-07: If you believe this form requires an update, please contact us.
Related Forms and Resources
- Form IL-1040 – Individual Income Tax Return
- Schedule K-1-P – Partner’s Share of Income
- Schedule K-1-T – Beneficiary’s Share of Income
- Illinois DOR – Schedule IL-WIT
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Frequently Asked Questions
Will IL tax my Roth conversions?
Conversions are taxable federally and typically flow to IL; IL retirement exclusion usually applies to distributions, not conversions—check IL guidance.
How do I amend my Illinois return?
File Form IL-1040-X after your original IL-1040 is processed; include revised schedules (e.g., Schedule ICR/CR/M) and explanations.
Why does Illinois distinguish pre-1969 and post-1969 gains?
Because Illinois enacted its income tax on August 1, 1969, any appreciation before that date occurred before the state had authority to tax income. Form IL-F preserves fairness by taxing only the gain realized since Illinois income tax law took effect. This approach avoids retroactive taxation while ensuring current gains are taxed appropriately.
When should Schedule FD be filed?
File Schedule FD with your annual IL-1040 return for the tax year in which the deferred income became federally taxable.
Why is Schedule M important for accurate Illinois taxes?
Illinois uses Schedule M to ensure fairness in applying its flat 4.95% tax rate. Because Illinois starts from federal AGI, this form ensures only Illinois-approved income is taxed and proper deductions are applied. It’s especially vital for retirees, military personnel, and taxpayers with multistate investments.
Important Notes
All calculations are estimates for guidance only. Always review your return and consider professional advice when submitting official filings.