Colorado E-Filer Attachment Form - Web this form is used to submit documentation for various credits on your colorado income tax return. This form is for income earned in tax year 2023, with tax returns due in april 2024. Using this form can extend return processing time up to 6 weeks. Web file now with turbotax. We will update this page with a new version of the form for 2025 as soon as it is made available by the colorado government. Otherwise, complete this form, package it with your documentation and mail to the department. Using this form can extend return processing time up to 6 weeks. Otherwise, complete this form, package it with your documentation and mail to the department. We last updated colorado form dr 1778 in january 2024 from the colorado department of revenue.
Otherwise, complete this form, package it with your documentation and mail to the department. Otherwise, complete this form, package it with your documentation and mail to the department. We last updated colorado form dr 1778 in january 2024 from the colorado department of revenue. Web file now with turbotax. This form is for income earned in tax year 2023, with tax returns due in april 2024. We will update this page with a new version of the form for 2025 as soon as it is made available by the colorado government. Web this form is used to submit documentation for various credits on your colorado income tax return. Using this form can extend return processing time up to 6 weeks. Using this form can extend return processing time up to 6 weeks.