Plain-English guides to Colorado state tax forms, including the DR 0104 individual income tax return, the DR 0112 C corporation return and the DR 0100 retail sales tax return.
![Colorado Form DR 0104AD — Subtractions from Income Schedule [thisnextyear]](https://taxformdesk.com/wp-content/uploads/2026/10/out-feat-form-dr-0104ad.jpg)
How to fill out Colorado Form DR 0104AD, the Subtractions from Income Schedule: Social Security and pension subtractions by age, military retirement, CollegeInvest and ABLE limits, lines 1 to 22 explained and where the total goes on the DR 0104. Verified against the Colorado Department of Revenue’s 2025 form.
![Colorado Form DR 0104PN — Part-Year Resident/Nonresident Tax Calculation Schedule [thisnextyear]](https://taxformdesk.com/wp-content/uploads/2026/10/out-feat-form-dr-0104pn.jpg)
How to fill out Colorado Form DR 0104PN, the Part-Year Resident/Nonresident Tax Calculation Schedule: who must file it, the federal and Colorado columns, lines 5 to 36 explained, the Colorado percentage and where the apportioned tax goes on the DR 0104. Verified against the Colorado Department of Revenue’s 2025 form.
![Colorado Form DR 0104 — Individual Income Tax Return [thisnextyear]](https://taxformdesk.com/wp-content/uploads/2026/10/out-feat-form-dr-0104.jpg)
How to complete Colorado Form DR 0104, the Individual Income Tax Return: who files, the 4.4% rate, the April 15 due date and October 15 extension (filing only), additions and subtractions, credits, the TABOR refund lines and where to mail it. Verified against the Colorado Department of Revenue’s 2025 booklet.