Colorado State Taxes and CO Income Tax

efile Colorado state tax return
"The Centennial State"

Prepare and e-file your current year Colorado state tax return - resident, nonresident, or part-year resident returns - together with your IRS return now via

  • State return only regulation: Per IRS and Colorado state tax agency regulation - not - you can NOT just prepare and e-file a state returns (with the exception of California) without also e-filing the IRS return on the same platform. If you have filed your federal return already, you can prepare a Colorado state return on and then download, print, sign, and mail it in. See instructions on how to ONLY prepare and download a Colorado and/or other state tax return.
  • Get your CO and IRS returns e-filed together so you do not have to mail anything

CO Tax Help and Resources

Colorado State Income Tax Rate: 4.40%
Estimate your CO Income Taxes now
Compare other state income tax rates.
Where Is Your Colorado Tax Refund Money?
Step 1: Sign into your account and check acceptance by the tax agency.
Step 2: Check your Colorado tax refund status.
Where Is Your IRS Refund?
Step 1: Sign into your account and check acceptance by the IRS.
Step 2: Check your IRS tax refund status.
Colorado Income Tax Extension
Colorado Income Tax Amendment
How to Correct a Rejected Tax Return
If your CO income tax return was rejected by the CO tax agency - not - see instructions on how to correct a rejected Colorado tax return.
How to Pay Income Taxes
Colorado, IRS Late Filing, Tax Payment Penalties
1. Late Filing Penalty: This penalty is $5 or a percentage of the unpaid tax equal to 5% (whichever is greater) for each month the tax return is filed after Tax Day, plus ½% for each full or partial month the tax remains unpaid. It will not exceed a total of 12%.
2. Late Payment Penalty: This penalty is the same as the late filing penalty.
3. IRS Penalties: Calculate and estimate your potential IRS income tax return penalties.
CO Tax Return Mailing Addresses
Find various Colorado mailing addresses for tax returns, tax amendments, and tax payments.
Colorado Income Tax Brackets
Colorado Income Tax Forms
Colorado Unemployment Benefits

Start Federal and Colorado Tax Returns

e-File These Colorado State Tax Forms

Prepare and e-file these Colorado state forms in conjunction with your federal and state income tax return. As you proceed through the tax interview on, the application will select the correct state forms for you. You can also select tax forms individually. All these forms will then be e-filed by you to the CO state tax agency. See instructions on how to only prepare a state income tax return.

CO Tax Forms
DR 0102 - Colorado Claim for Refund on Behalf of Deceased Taxpayer
104 - Individual Income Tax Return
104CR - Individual Credit Schedule 2020
104PN - Part-Year Resident/Nonresident Tax Calculation Schedule 2020
DR 0104X - Colorado Amended Individual Income Tax Return
DR 0204 - Tax Year Ending Computation of Penalty Due Based on Underpayment of Colorado Individual Estimated Tax
DR 0900 - Colorado Individual Income Tax Payment Form
DR 1366 - Enterprise Zone Credit and Carry forward Schedule
DR-0158-I - Extension Payment for Colorado Individual Income Tax

* Due to IRS and state tax agency data sharing and validation requirements, you can only e-file a state income tax return while also e-filing a federal income tax return. This is not an created policy, but a federally regulated one which all online tax filing websites have to adhere to. You can, however, prepare all 44 state income tax returns on if you have already e-filed or filed your IRS return. View instructions on how you can ONLY prepare and file state income tax return(s). Only on can you prepare and file or e-file unlimited state tax returns for one low price and not pay for each state return like you would do on H&R Block® vs. TurboTax®. Dare to compare now.