File Illinois Form IL-1040-X
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Illinois Form IL-1040-X is a tax return document for taxpayers who need to amend their previous return. Also known as the amended individual tax return form, it is used to correct any errors in income, reimbursements or tax credits on a number of other Illinois IL-1040 tax documents. When filling out your IL-1040-X form, you will be given the chance to explain why you are making an amendment in your tax return.