Colorado Form 104X (DR 0104X) - Fill Out and Use This PDF

Colorado Form 104X (DR 0104X) PDF Details

Colorado Form 104X, also called the DR 0104X, is the Amended Colorado Individual Income Tax Return. File this form when you discover an error or omission on a previously filed Colorado income tax return. Common reasons to file an amended return include correcting income amounts, adding missed deductions, claiming overlooked tax credits, updating your filing status, or reporting federal changes made by the IRS to your original return.

Who should file Form 104X: Colorado full-year residents, part-year residents, and nonresidents who need to amend a state income tax return from a prior year. If you are a part-year resident or nonresident filing an amended return, attach a corrected Form 104PN to your 104X. Keep a copy of your original return on hand, as the 104X requires you to enter both original and corrected amounts side by side.

Filing deadline: The statute of limitations for a Colorado income tax refund claim is generally 4 years from the original due date of the return. If you owe additional tax, file as soon as possible to minimize interest and penalties. For amendments resulting from an IRS adjustment, Colorado generally requires you to file within 30 days of the federal notice.

Key sections covered by Colorado Form 104X include corrected income and adjusted gross income, Colorado additions and subtractions, nonrefundable and refundable tax credits, estimated tax payments, Colorado income tax withheld, penalty and interest on underpayments, direct deposit or payment instructions, and special provisions for part-year residents and nonresidents. The form mirrors the structure of the original Form 104 (DR 0104), so completing it is straightforward if you have your original return nearby.

If you also need to amend your federal return, file IRS Form 1040-X along with your Colorado 104X. Reviewing related forms like IRS Form 1040 can also help ensure your federal and state returns align after amendment.