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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.
The IRS requires the Colorado Department of Revenue to provide Form 1099-G to taxpayers who may have itemized deductions on their federal return the previous year. The form is in postcard format. A separate copy of your 1099-G is sent to the IRS. Amounts on this form include:
Taxpayers who itemized their deductions using Schedule A on last year’s federal return must use this information to complete their federal return this year. Taxpayers who took the standard deduction on last year’s federal return generally will not report the refund on their federal return.
If you do not receive the 1099-G in the mail, sign up for access and log in to your account through our Revenue Online service to view the amount of last year’s Colorado refund that was reported to you on Form 1099-G. If there is no record of a 1099-G in your account, you may not have received a taxable income tax refund last year.
The 1099-G forms are mailed by January 31 of each year. You should receive the form (which is in a postcard format) by mid-February. 1099-Gs are sent only to taxpayers who itemized deductions last year on their federal schedule A and received a state income tax refund of more than $10. To determine if last year's refund was large enough to be reported on a 1099-G, add the amount of last year's refund check you received with:
If you itemized your deductions last year and the above calculation indicates that the amount to be reported on the 1099-G is larger than $10, call 303-238-SERV (7378) with the information to request another copy of form 1099-G, or visit our Revenue Online service to access the amount of last year's Colorado refund, which will be available February 1. You will need to first sign (Create a Login ID and Password) up through Revenue Online to view this information.
For federal W-2 information you must contact the IRS.
If you filed your Colorado income tax return and now have an additional W-2 that changes your tax or refund you must use an amended return to correct the filing. Filing a corrected original return will not correct your return and may cause serious problems on your income tax account.