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This version of the form is not currently in use and is provided for reference only. Download this version of
Form IL-1040-X
for the current year.
Form IL-1040-X Amended Individual Income Tax Return - Illinois
What Is Form IL-1040-X?
This is a legal form that was released by the Illinois Department of Revenue - a government authority operating within Illinois. Check the official instructions before completing and submitting the form.
FAQ
Q: What is Form IL-1040-X?
A: Form IL-1040-X is the Amended Individual Income Tax Return for residents of Illinois.
Q: Who needs to file Form IL-1040-X?
A: Residents of Illinois who need to correct or amend their previously filed Illinois Individual Income Tax Return.
Q: When should I file Form IL-1040-X?
A: File Form IL-1040-X as soon as you discover an error or omission on your previously filed Illinois Individual Income Tax Return.
Q: What information do I need to complete Form IL-1040-X?
A: You will need information from your original Illinois Individual Income Tax Return, as well as any additional documentation to support the amendments you are making.
Q: Can I e-file Form IL-1040-X?
A: No, Form IL-1040-X cannot be e-filed. It must be filed by mail.
Q: Is there a deadline for filing Form IL-1040-X?
A: Yes, Form IL-1040-X must be filed within 3 years from the original due date of the return or within 2 years from the date the tax was paid, whichever is later.
Q: Do I need to include payment with Form IL-1040-X?
A: If you owe additional tax as a result of amending your return, you must include payment with Form IL-1040-X.
Form Details:
- Released on December 1, 2019;
- The latest edition provided by the Illinois Department of Revenue;
- Easy to use and ready to print;
- Quick to customize;
- Compatible with most PDF-viewing applications;
- Fill out the form in our online filing application.
Download a fillable version of Form IL-1040-X by clicking the link below or browse more documents and templates provided by the Illinois Department of Revenue.
Download Form IL-1040-X Amended Individual Income Tax Return - Illinois
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