Please remember that you must claim the state sales tax refund (TABOR refund) when filing your state income tax return. If you claimed a 2023 refund, the TABOR refund will be combined and issued out with your refund. Unlike the 2022 Colorado cashback, no separate check will be issued. 

 
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Income Tax Forms Archive

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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.

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C Corporation Income

2017

2016

2015

2014 & Prior

Fiduciary Income

2017

2016

2015

2014 & Prior

Individual Income

2017

2016

2015

2014 & Prior

Partnership & S Corporation Income

2017

2016

2015

2014 & Prior

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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.