Illinois State Tax Forms & Schedules for 2026
The tax forms on this page can be essential for your Illinois state tax return. Each form automatically calculates the relevant deductions and tax amounts based on the 2026 Illinois State tax tables.
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Illinois Tax Forms
The tax forms below are for Illinois State tax return calculations. Each form will automatically calculate the relevant tax deductions and amount based on the 2026 Illinois State tax tables
Browse the essential Illinois (IL) tax forms used for personal and business income tax filing. Common examples include Form IL-1040 (Individual Income Tax Return) and Schedule M (Other Additions and Subtractions), along with credits, withholding, and estimated payment schedules supporting Illinois taxpayers.
- Illinois Tax Form IL-1040
Individual Income Tax Return - Illinois Tax Form IL-1040-ES
Estimated Income Tax Payments For Individuals - Illinois Tax Form IL-1040-V
Payment Voucher For Individual Income Tax - Illinois Tax Form IL-1040-X
Amended Individual Income Tax Return - Illinois Tax Form IL-1040-SCHEDULE-CR
Credit For Tax Paid To Other States - Illinois Tax Form IL-1040-SCHEDULE-FD
Tax On Federally Taxed Distributions - Illinois Tax Form IL-1040-SCHEDULE-G
Voluntary Charitable Donations - Illinois Tax Form IL-1040-SCHEDULE-G-L
Voluntary Charitable Donations For Lottery Winnings - Illinois Tax Form IL-1040-SCHEDULE-ICR
Illinois Credits - Illinois Tax Form IL-1040-SCHEDULE-IL-E-EITC
Earned Income Credit - Illinois Tax Form IL-1040-SCHEDULE-K-1-P
Partner’s Or Shareholder’s Share Of Income - Illinois Tax Form IL-1040-SCHEDULE-K-1-T
Beneficiary’s Share Of Income - Illinois Tax Form IL-1040-SCHEDULE-M
Additions And Subtractions - Illinois Tax Form IL-1040-SCHEDULE-NR
Nonresident And Part Year Resident - Illinois Tax Form IL-1040-SCHEDULE-NR-AP
Apportionment Detail For Nonresidents - Illinois Tax Form IL-1040-SCHEDULE-VDA
Voluntary Disclosure Agreement Form - Illinois Tax Form IL-1040-SCHEDULE-1299-A
Tax Subtraction And Credit Summary - Illinois Tax Form IL-1040-SCHEDULE-1299-C
Recapture Of Credits - Illinois Tax Form IL-1040-SCHEDULE-1299-DA
Credit For Tax Paid To Other States – Detail - Illinois Tax Form IL-W-4-NR
Nonresident Employee Withholding Certificate - Illinois Tax Form IL-941
Illinois Withholding Income Tax Return - Illinois Tax Form IL-1299-C
Tax Credit Recapture Schedule - Illinois Tax Form IL-2210
Computation Of Penalties For Individuals - Illinois Tax Form IL-4562
Depreciation And Amortization Adjustments - Illinois Tax Form IL-WIT
Illinois Income Tax Withheld - Illinois Tax Form IL-F
Gains From Sales Or Exchanges Of Property Acquired Before August 1, 1969 - Illinois Tax Form IL-SA
Specific Accounting Schedule (fiscal Year Filers) - Illinois Tax Form IL-W-4
Employee’s Illinois Withholding Allowance Certificate
Tip: Use the Illinois Tax Calculator to fine-tune your refundable and non-refundable tax credits. Complete, calculate, print, and save your tax calculation for later use.
Frequently Asked Questions
Quick answers for Illinois filers: flat-rate state tax, federal coordination, deductions, dependents, and withholdings.
Do I need to file IL-1040-X if the IRS changes my income?
Yes. If the IRS adjusts your federal return and it affects Illinois tax, you must file IL-1040-X within 120 days of receiving the federal notice.
Are donations made through Schedule G-L tax-deductible?
Yes. Your Schedule G-L donations are eligible for a federal charitable deduction if you itemize on your federal Form 1040 Schedule A. Keep a copy of the filed schedule and any Lottery confirmation of your gift. The contribution will increase your Illinois payment or reduce your refund, but may lower your federal taxable income in the following year.
Changing jobs mid-year in IL
Update income/withholding and frequency; brackets are flat but credits/exemptions still matter.
Who must file Schedule FD?
You must file Schedule FD if you are a former Illinois resident who receives income (such as installment sale gains or deferred bonuses) sourced from Illinois that became taxable for federal purposes during 2026.
What documentation must accompany Schedule 1299-DA?
Attach copies of the other states’ filed tax returns, W-2s, or K-1s showing withholding and payments. Failure to attach proof can lead to denial of the credit. For convenience, you can track and upload copies directly through the MyTax Illinois portal.
Important Notes
All calculations are estimates for guidance only. Always review your return and consider professional advice when submitting official filings.