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Income Tax Forms Archive

The forms listed below are only valid for tax years 2017 and prior. When filing for a prior year, be sure to only use the versions of forms that apply to that tax year. Additionally, prior year forms cannot be used for the current tax year.

C Corporation Income

Fiduciary Income

2024 | 2023 | 2022 | 2021 | 2020 | 2019 (archived) | 2018 (archived) | 2017 | 2016 | 2015 | 2014

Individual Income

If you are looking for a prior year for a tax year that is not listed above, please visit the Forms by Tax Type web page to search for a form. If you need additional forms assistance, please email DOR_TaxpayerService@state.co.us.