Jump to navigation
Skip to main content
Mail a Form
Corporation Income Tax -- Quick Answers
Amending a return
If an amended return is filed with the IRS, or if the IRS changes the content of the return, an amendment must be filed with Colorado. Sign in to the corporation income tax account in
or use the paper
Corporation Amended Return 112X
to amend the Colorado return. If the corporation operates in multiple states, the Department will accept the revenue agent report (RAR) in lieu of an amended return. Be sure to list the Colorado account number on the RAR before mailing a copy to Colorado Department of Revenue, Denver CO 80261-0006.
Caution: federal adjustments must be reported to the Colorado Department of Revenue. See §39-22-601(6), C.R.S. for information about the statute of limitations.
Submit supporting documentation.
Every return you file (original or amended) is processed independently. Therefore, Send only the
supporting documents with the amended return and
the schedules. In the past, we asked for all supporting documents even if they were already submitted. Documents can be submitted electronically using the E-Filer Attachment function on Revenue Online, with
E-Filer Attachment Form (DR 1778)
or see instructions below if you are filing a paper amendment.
Refer to the
-Corporation Income Tax Return 112 Booklet
for details about credits, subtractions, and general tax return information. Additional information can also be found in FYI Publications.
Mark the correct box
or select the amendment reason on Revenue Online. For example, if the amended return is carrying back a net operating loss, be sure to properly indicate this at the top of the amended form.
…if you want to file a paper 112X
Download form 112X and be sure to
use the correct form year
. Each return is specific year-to-year according to the tax laws. Using the form for the wrong year will certainly cause a miscalculation of tax and may result in a bill.
Send only form 112X and
include a copy of the original 112.
Place the 112X form on the top of all paperwork in the envelope. Copies of schedules and other supporting documents should be behind the 112X.
Calculating a net operating loss for Colorado income tax
The Colorado net operating loss of a corporation is computed in the same manner as the federal net operating loss deduction except that in the case of a corporation apportioning income, it is that part of the federal net operating loss, as modified, that is from Colorado sources. Federal limitations on carryover losses between predecessor and successor corporations apply for Colorado income tax purposes.
Copies of Returns
Taxpayers may obtain copies online of their most recent income tax returns (paper or e-filed). Sign up for access to your tax account through
. Revenue Online is a secure method of accessing tax account history and information.
• If you are looking for an older return or you cannot access Revenue Online, download the Request for Copy of Tax Returns form
. This form must be notarized before you mail it to the department address noted in the instructions. This form may not be faxed. Please include the address where the documents should be mailed. Allow six to eight weeks to receive the certified copies.
• Visit any
taxpayer service center location
. The representatives can access copies of your returns at these locations. If you need a certified copy of a tax return, complete the DR 5714 when you are in the service center and submit it to the representative. Allow six to eight weeks to receive certified copies by mail.
• Contact our Tax Information line: 303-238-7378. A copy of the return will be mailed to you. If you need a certified copy of a tax return, the representative will mail the DR 5714 request form to you. Complete the form, get it notarized and mail to the department address noted in the instructions. Allow six to eight weeks to receive certified copies by mail.
A third party who has a valid state or federal Power of Attorney may request return copies by attaching the Colorado Tax Information Designation and Power of Attorney for Representation (
) or the federal 2848 power of attorney form to the DR 5714. The Power of Attorney document must specify the tax types the third party can access. Note that to ensure tax information confidentiality, the Request for Copy of Tax Returns requires notary verification on the paper form regarding the identity of the individual making the request, even when the taxpayer (not a third party) is making the request.
Built-in gains of S corporations similar to the federal Internal Revenue Service
Colorado does not tax the built-in gains of an S corporation because an S corporation is not directly subject to Colorado income tax.
C corporations are required to pay Colorado estimated income tax during the taxable year if it can reasonably be anticipated that the corporation’s Colorado tax liability for the tax year will exceed $5,000.
The Colorado tax liability for purposes of the estimated tax computation is defined as the total amount of Colorado tax plus the recapture of prior year credits less all income tax credits other than withholding credits and estimated tax credits.
Each C corporation doing business in Colorado, or those who derive income from Colorado sources, must file a Colorado corporation income tax return. Organizations that have been granted exempt status by the Internal Revenue Service (IRS, federal taxes) are generally exempt from Colorado income taxation. However, those tax exempt entities that file Federal form 990-T to report unrelated business taxable income from Colorado sources or from business activity in Colorado are subject to Colorado income taxation and are required to file a corporation income tax return. Any insurance company subject to the tax imposed on gross premiums by §10-3-209, C.R.S. is exempt from Colorado income tax.
Corporations that are members of an affiliated group of corporations, as defined in section 1504 of the federal Internal Revenue Code, must determine whether to file separate returns, a consolidated return, a combined return, or a combined/consolidated return.
A Corporation doing business only in Colorado will compute its tax on 100% of the Colorado taxable income. However, a corporation doing business in more than one state must apportion its taxable income to any states in which the corporation is doing business.
Corporate income tax returns are due 3½ months after the end of your tax year, or by April 15 for traditional calendar year filers. If you are unable to file by your prescribed due date, you may file under extension. See
Extension Payment Voucher - Corporation (DR 0158-C)
for more information about filing extensions.
Income tax credits
You may inquire about the status of your refund by visiting our
service, 24-hours a day, seven days a week. Sign up for Revenue Online access, then login to your account.
Relief -- Natural disasters
The Colorado Department of Revenue understands some taxpayers will be unable to meet Colorado filing and payment deadlines as a result of various natural disasters (tornadoes, wildfires, floods,etc.) For more information see
Relief -- Natural disasters