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Expert AlumniYes, you need to mail the Form 1040X (federal amended tax return), Form 104X (the Colorado amended tax return), Form 1098, and any documentation you were required to attach to your original tax return.
According to the instructions for Form 104X Colorado amended tax return : Attachments: Be sure to refer to the 104 Booklet to see which attachments are required for your tax situation. You must attach all required documentation to this return - even if you attached it to your original return. All attachments and certifications must be included with the amended return even if there is no change to that credit or tax attribute. Part year residents and nonresidents must attach the corrected Form 104PN. If this amended return is the result of an adjustment made by the Internal Revenue Service, attach a copy of the federal revenue agent’s report with supporting schedules. To expedite your refund, submit a copy of the federal record of account to support any changes to federal taxable income (such as a mutual fund, brokerage firm or credit union) in the United States"
According to the 104 Book: "W-2s and 1099s When filing a paper return, all W-2s and/or 1099s that show Colorado income tax withholding must be stapled to the front of the form where indicated. When filing an electronic return, attach scanned copies of all W-2s and/or 1099s that show Colorado income tax withholding to the e-filed tax return. If you are unable to attach W-2s and/or 1099s to your e-filed return, submit through Revenue Online, Colorado.gov/RevenueOnline"
M ail amended tax return, all attachments, and copies of your documents to :
Colorado Department of Revenue, Denver, CO 80261-0005
