"2027" also needs care. It names the tax year, not necessarily the year you file. As of November 2, 2026, the Colorado Department of Revenue (CDOR) had posted no 2027 annual return or instructions. This guide covers the correct Colorado form, schedules, eligibility, documents, filing methods, deadlines, and common mistakes. All figures below come from 2025 and 2026 materials unless stated, so confirm them against the official 2027 release.
Key Takeaways
- Colorado's return is the DR 0104, not a "Form 1040".
- Part-year residents and nonresidents add the DR 0104PN schedule.
- Start from your federal return, but complete Colorado additions, subtractions, credits, and withholding separately.
- Never use a prior-year form for 2027; wait for the official version.
Colorado State Form 1040 for 2027: Which Form Do You Actually Need?
IRS Form 1040 is the federal individual return, issued by the IRS. Colorado requires a separate state return. CDOR identifies it as the DR 0104 (the 2025 version was revised 10/03/25). "Colorado State Form 1040 for 2027" is not an official form name.
Federal Form 1040 versus Colorado's state return
The federal return supplies your starting numbers but never replaces the state filing. DR 0104 line 1 begins with federal taxable income, not adjusted gross income. State additions and subtractions then produce Colorado taxable income, which can differ from the federal figure.
W-2s, 1099s, and K-1s feed both returns. Not every federal schedule is attached to the Colorado filing unchanged, so follow the Colorado instructions.
Understanding the 2027 tax-year label
Tax year and filing year are different labels. The IRS opened its 2026 filing season on January 26, 2026, for tax year 2025. Colorado began accepting 2025 returns on January 27, 2026. Income you earn in 2027 is reported in the 2028 filing season.
If you only see 2026 or earlier versions today, do not use them for 2027 income. The posted 2026 item, DR 0104EP, is an estimated-payment form, not an annual return. Monitor the official forms page for the 2027 DR 0104; a fixed release date is not listed there.
Finding the official form
Use CDOR's individual income tax forms page. Then check:
- The form year and revision date
- The instruction booklet
- Required schedules
- Mailing address and e-file options through Revenue Online
For 2025, paper returns with payment went to Denver, CO 80261-0006, and those without payment to 80261-0005. The 2025 form required all eight pages when mailed. Avoid third-party PDF sites unless the document matches the official CDOR library.
Who Must File and Which Colorado Schedules Apply?
CDOR's January 2026 guide says each resident, part-year resident, or nonresident with Colorado-source income must file if they must file a federal return or incur Colorado tax liability. Confirm the exact 2027 triggers in the official instructions.
| Status | What Colorado taxes |
|---|---|
| Full-year resident | Income from inside and outside Colorado |
| Part-year resident | Income while resident, plus Colorado-source income while nonresident |
| Nonresident | Colorado-source income |
Full-year residents
You're a resident if you're domiciled in Colorado, or if you keep a permanent place of abode there and spend more than six months of the year in the state. Domicile means the permanent home you intend to return to when away.
Part-year residents and nonresidents
File the DR 0104PN with your DR 0104. It calculates tax as if you were a full-year resident, then apportions it to Colorado income. CDOR's sourcing guidance:
- Wages: work physically performed in Colorado
- Personal services: services performed in Colorado
- Rent and property income: property located in Colorado
- Business income: business carried on in Colorado, with statutory apportionment where applicable
Sourcing rules depend on your facts, so verify them before reporting.
Income types and business structures
Partnership and S corporation owners use Colorado K-1 information for income, modifications, and credits. Trust and estate beneficiaries report fiduciary income taxable to Colorado. Entity returns stay separate from the owner's DR 0104.
Pass-through entities have three routes with different owner consequences:
- Composite return: consenting nonresident owners are included (DR 0107 and DR 0108 apply to excluded owners)
- Nonresident remittance: the entity pays on behalf of owners who haven't agreed to file
- SALT Parity election (DR 0106): owners get a refundable credit, and a nonresident whose only Colorado income is in the entity return need not file separately
Withholding, credits, additions, and subtractions
CDOR lists 4.4% as the rate for tax year 2025. Confirm the 2027 rate in the official CDOR instructions before you file. The 2025 subtractions below show items to review; check current forms for 2027 limits:
| Item | 2025 rule |
|---|---|
| Pension/annuity | Up to $20,000 (ages 55-64) or $24,000 (65+) |
| Social Security | Age 65+: all taxable benefits; ages 55-64 have AGI thresholds |
| Military retirement | Up to $15,000 under age 55 |
| 529 contributions | $25,400 single / $38,100 joint per beneficiary |
Schedules include DR 0104AD (subtractions), DR 0104CR (credits), and DR 0104CH (voluntary contributions).
Support for complex or cross-border taxpayers
Nonresident aliens use federal Form 1040-NR, which does not replace the Colorado return. Foreign investors and business owners with Colorado-source income often juggle federal, state, and international records. VJM Global supports US individual returns (Form 1040 and 1040-NR) and cross-border accounting and advisory coordination. We don't have a Colorado office.
What to Gather and How to Complete the 2027 Return
Collect these before you start:
- Federal return or draft
- W-2s, 1099s, and K-1s
- Records of Colorado withholding and estimated payments
- Income and expense records
- Prior-year returns
- SSN or ITIN for you and your spouse
- Documents for state-specific adjustments
Build the federal starting point
Finish the federal return first. Then carry figures across, remembering federal taxable income does not automatically equal Colorado taxable income. Use the 2027 instructions for additions, subtractions, credits, and federal changes. If a federal adjustment affects Colorado tax, the January 2026 guide requires DR 0104X within 180 days of finalization.
Complete the correct Colorado form and schedules
- Enter taxpayer details, residency status, and filing status.
- Start with federal taxable income, then apply Colorado additions and subtractions.
- Enter Colorado-source amounts if you're part-year or nonresident, using DR 0104PN.
- Add withholding, estimated payments (DR 0104EP), and credits.
- Calculate your balance due or refund.
- Attach every required schedule and supporting statement.
Review for consistency
Check names, SSNs or ITINs, filing status, income totals, and bank details. Compare withholding with your W-2s and 1099s. Common causes of notices:
- Wrong tax year form
- Missing schedule
- Reporting all income to Colorado when only part is Colorado-source
- Withholding that doesn't match source documents
CDOR notes that missing documentation can delay processing or lead to denied subtractions and credits.
Submit and retain records
File through Revenue Online, accepted software, a paid preparer, or paper. On paper returns, both spouses sign a joint return. Pay online by credit card, e-check, or EFT, or send a check with DR 0900. Verify 2027 options in the instructions.
Keep the return, confirmation, payment receipt, schedules, source documents, and notices. CDOR recommends at least four years after the due date, while the IRS guidance generally says three years, with longer periods in some cases.
Deadlines, Extensions, Payments, and Common Errors
The 2025 return was due April 15, 2026. Do not assume 2027 dates until CDOR confirms them. When a date falls on a weekend or legal holiday, it moves to the next business day.
Colorado gives an automatic six-month filing extension, ordinarily to October 15, with no request form. Payment is still due on the original date. Pay electronically or with DR 0158-I. To qualify for the late-payment penalty waiver, pay at least 90% by the original deadline and the rest when filing.
Per CDOR's penalty guidance, late filing or payment costs the greater of $5 or 5% of unpaid tax plus 0.5% per month, capped at 12%. The 2026 interest rate is 11% (8% discounted); confirm the 2027 rate with CDOR when it is published.
Prevent errors:
- Use the correct 2027 form
- Confirm residency
- Reconcile withholding
- Attach DR 0104PN or other schedules
- Pay by the due date
- Answer CDOR notices promptly
Conclusion
Federal Form 1040 never substitutes for Colorado's DR 0104. Confirm the current form, revision date, and instructions on the CDOR site before filing.
Residents, nonresidents, business owners, and foreign investors with complex income may want professional review, especially when federal, Colorado, and cross-border records must line up.
Frequently Asked Questions
Where can I find the 2026 Colorado state tax form?
The 2026 annual return is not posted yet. Use CDOR's individual income tax forms page; the only 2026 item listed is DR 0104EP, an estimated-payment form. The 2026 filing season uses the 2025 return.
What is the Colorado state tax form for 2027?
It is expected to be the DR 0104 series, but no 2027 version was posted as of November 2, 2026. Confirm the form number, revision date, and instructions on CDOR's site.
Is Colorado Form 1040 the same as the federal Form 1040?
No. Form 1040 is federal. Colorado requires the separate DR 0104, which begins with your federal taxable income.
Who needs to file a Colorado individual income tax return?
Residents, part-year residents, and nonresidents with Colorado-source income generally file if they must file federally or owe Colorado tax. Check the 2027 instructions for exact conditions.
When is the Colorado 2027 income tax return due?
Confirm it in CDOR's 2027 instructions. Tax year 2027 is filed after the year ends, in the 2028 filing season. The 2025 return was due April 15, 2026.
Can I get an extension to file my Colorado income tax return?
Colorado has granted an automatic six-month filing extension with no form needed. Payment is still due on the original deadline, so confirm this in 2027 guidance.
