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This form is used by individuals in Illinois to amend their previously filed individual income tax returns for corrections or updates based on new information.
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How to fill out form il-1040-x

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How to fill out Form IL-1040-X

01
Obtain a copy of Form IL-1040-X from the Illinois Department of Revenue website.
02
Read the instructions carefully to understand the changes you are making.
03
Fill out your personal information at the top of the form, including your name and address.
04
Complete the 'Original Return' section with the information from your initial IL-1040 form.
05
In the 'Amended Information' section, provide the corrected amounts for the items you are amending.
06
Explain the reason for the amendment in the designated area on the form.
07
Recalculate your tax liability and any refund or balance due based on the amended information.
08
Review the form for accuracy and make sure all required sections are filled out.
09
Sign and date the form before submitting it.
10
Mail the completed form to the appropriate address provided in the instructions.

Who needs Form IL-1040-X?

01
Any individual who needs to correct errors or make changes to their previously filed Illinois state income tax return.
02
Taxpayers who have discovered that they need to amend their income, deductions, credits, or filing status.
03
Individuals who need to claim a refund based on an amended return or pay additional taxes owed.
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If your change decreases the tax due to Illinois and you want a refund, you must file an amended return (claim for overpayment) within three years after the extended due date, three years after the date your original return was filed, or one year after the date your Illinois tax was paid, whichever is latest.
To amend a return, file Form 1040-X, Amended U.S. Individual Income Tax Return. You can use tax software to electronically file your 1040-X online. Submit all the same forms and schedules as you did when you filed your original Form 1040 even if you don't have adjustments on them.
Use MyTax Illinois to electronically file your original Individual Income Tax Return. It's easy, free, and you will get your refund faster.

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Form IL-1040-X is an amended individual income tax return form used by taxpayers in Illinois to correct errors or make changes to their previously filed IL-1040 form.
Taxpayers who have already filed an IL-1040 and need to correct errors or make changes in income, deductions, or credits are required to file Form IL-1040-X.
To fill out Form IL-1040-X, taxpayers should provide their personal information, indicate the year of the original return, show the changes being made in the relevant sections, and include any additional documentation if necessary.
The purpose of Form IL-1040-X is to allow taxpayers to correct or amend their previously filed Illinois income tax returns to ensure accurate reporting and compliance.
Form IL-1040-X must report the taxpayer's name, address, Social Security number, details of the changes made (including additional income or deductions), and the reason for the amendment.
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