DR 0112X: Amended C Corporation Income Tax Return (2024)
Colorado · Colorado DOR · Used for tax years 2024
Form DR 0112X is used to correct a 2024 Colorado C Corporation income tax return. It reports amended tax amounts and determines any additional amount owed, refund, or overpayment to credit toward estimated tax.
Who files this form
Use the 2024 DR 0112X to correct a Colorado C corporation income tax return for tax year 2024.
You must use the amended return form for the tax year you are correcting. The Department cannot process an amended return on the wrong year's form.
What you'll need
Submit all required schedules and supporting certifications, even if they have not changed from the original return.
Have the following information and documents available, as applicable:
- The corporation's name, address, Colorado Account Number and federal employer identification number (FEIN).
- Federal taxable income from Form 1120, line 30; Form 1120X, line 3c; or Form 990-T, Part I, line 11.
- The original return or previously adjusted amounts if you are calculating the refund or balance due yourself.
- DR 0112RF for receipts-factor or special-rule apportionment, and Schedule C for the group filing types that require it.
- Required credit forms, such as DR 0112CR, DR 1366, DR 1370, DR 1330, DR 1305G, DR 0617, DR 1307 and DR 0619, for the credits you claim.
- W-2G forms if claiming withholding from lottery winnings.
- A copy of the assessor's statement for the Business Personal Property Credit.
- The Office of Economic Development certificate for the employee-ownership conversion credit, and Colorado Energy Office certificates for Certified Greenhouse Gas Avoidance Credits.
- An explanation if you select “Other” or “Protective claim” as the reason for amending.
How to file
File online
File for free through Revenue Online at Colorado.gov/RevenueOnline. You can also pay online. Certain payment methods may have a small processing fee.
File on paper
If you cannot file electronically, you can file on paper, but processing may take longer. Complete the applicable parts of the return through page 5, including the officer's signature, title and date. Include all required schedules and supporting certifications.
With payment, mail to:
Colorado Department of Revenue
Denver, CO 80261-0006
Without payment, mail to:
Colorado Department of Revenue
Denver, CO 80261-0005
These addresses are exclusive to the Department, so no street address is required.
Pay by check
Make the check payable to the Colorado Department of Revenue. Write the tax year and your FEIN or Colorado Account Number on the check's memo line.
If filing on paper, include payment with the amended return. If filing electronically but paying by check, use Form DR 0900C to remit payment.
Common mistakes
- Using the wrong year's form. Your amended return cannot be processed unless the form matches the tax year being corrected.
- Leaving out unchanged supporting documents. Required schedules and certifications must still be submitted. Missing documents will cause processing delays and disallowance of credits, subtractions or reduced apportioned income.
- Stopping before completing the return. The form reminds you to continue through page 5.
- Leaving identifying information off a check. Include the tax year and your FEIN or Colorado Account Number, or your account might not be properly credited.
- Carrying a Colorado net operating loss back to an earlier year. The form specifically says this is not allowed.
- Overlooking the consolidated-report election warning. The election is binding for four years. If made in a prior year, enter the year of election.
Questions people ask
Can the Department calculate my refund or balance due?
Yes. After completing line 44, leave lines 45 through 60 blank if you want the Department to compute and mail your refund or compute your balance due and mail a bill. You still need to complete the rest of the return, including the signature section.
Can I apply an overpayment to next year's estimated tax?
Yes. Enter the amount to carry forward on line 59. Line 60 is the refund claimed after subtracting line 59 from the overpayment on line 58.
Do I need to resubmit schedules that have not changed?
Yes. All required schedules and supporting certifications must accompany the amended return, even if unchanged.
How do I identify a protective claim?
Check the protective claim box under the reason for amending and include an explanation. This applies to a claim contingent on future events that may not be determinable before the refund claim period expires.
Where can I find more information about income, deductions and credits?
Refer to the income tax 112 Book for 2024. The form also directs taxpayers to Tax.Colorado.gov for additional information and guidance publications.