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There is no form or application to request a tax extension from the State of Colorado. The only requirement is that at least 90% of your tax liability must be paid by the original deadline (April 15) to avoid late fees.
You can mail your state tax payment using Colorado Form DR 0158-I (Payment Voucher for Automatic Colorado Extension for Individuals). Note that you are not required to file Form DR 0158-I if you electronically pay your state tax liability online. To make an electronic state tax payment, you can go to Colorado’s “Revenue Online” system: www.colorado.gov/revenueonline
If you are unsure whether you need to make a state tax payment, use the worksheet on Form DR 0158-I to determine if you owe Colorado tax this year.
For more information, visit the Colorado Department of Revenue website: www.colorado.gov/revenue
Form DR 0158-I (Extension Payment Voucher for Colorado Individual Income Tax)
Mail this voucher (with payment) to the following address:
Colorado Department of Revenue
Denver, CO 80261-0008