2025 Illinois Form IL-1040

What Is Illinois Form IL-1040?

Illinois Form IL-1040 is the individual income tax return used by full-year residents, part-year residents, and nonresidents to file their state income tax return. The purpose of Form IL-1040 is to calculate how much income tax you owe the state of Illinois. Part-year residents and nonresidents generally use Form IL-1040 with Schedule NR to calculate Illinois tax.

Illinois does not publish a separate IL-1040EZ or short-form individual income tax return. Read the General Information section of the IL-1040 instructions book to help determine if you should file as a full-year resident, part-year resident, or nonresident for tax year 2025.

Who Must File Illinois Form IL-1040?

You must file an Illinois tax return if you were required to file a federal income tax return. There is also an income test for those who were not required to file a federal income tax return. You must file an Illinois tax return if your Illinois base income on Line 9 is greater than your Illinois exemption allowance on Line 10. For tax year 2025, Single residents under the age of 65 generally must file if their income is more than $2,850. Married residents under the age of 65 with no dependents generally must file if their income is more than $5,700.

Even if your Illinois base income is below the amount specified for your total exemption allowance, you may still want to file an Illinois tax return. You may receive a refund for the state tax amount shown on your Illinois W-2, for example. You may also be eligible for the Illinois Earned Income Tax Credit (EITC), Child Tax Credit, Property Tax Credit, K-12 Education Expense Credit, Volunteer Emergency Worker Credit, and other Illinois credits.

Read the Who Must File section of the IL-1040 instructions book to help determine if you should file a state income tax return for tax year 2025.

Printable Illinois IL-1040 Tax Forms

Printable Illinois Form IL-1040 Instructions

Click any of the Illinois income tax forms and instructions links above to download, save, view, and print the file for the corresponding year. These free PDF files are unaltered and are sourced directly from the publisher.

How To Check The Status Of My Illinois Tax Return?

To check the status of your Illinois income tax refund online, visit the Illinois Department of Revenue website and use their Where's My Refund service. Illinois Department of Revenue says electronically filed refunds can generally be expected around four weeks after filing, while refunds from paper returns may take more than eight weeks.

To check the status of your Illinois income tax refund for 2025 you will need the following information:

• Name
• Address
• Social Security Number or ITIN
• Adjusted Gross Income from Line 1

The requested information must match what was submitted on your 2025 Illinois Form IL-1040. To check prior year refunds, you will need to contact the Illinois Department of Revenue service center by phone or mail.

To contact the Illinois Department of Revenue service center by phone or email, use the check your refund status link above. Alternatively, read or print the 2025 Illinois Form IL-1040 instructions to obtain the proper phone number and mailing address.