E filer attachment 2026

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The document is an E-Filer Attachment Form (DR 1778) from the Colorado Department of Revenue, providing instructions for submitting required documentation when e-filing taxes. It emphasizes the importance of using the online submission option to avoid delays and outlines the necessary information and documents needed for various tax credits. The form must be mailed if electronic attachment fails, and it includes sections for taxpayer information and documentation checkboxes.

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Click ‘Get Form’ to open the e-Filer Attachment in the editor.
Begin by entering the Tax Year or fiscal year at the top of the form. Ensure you use the correct format (MM/DD/YY).
Select the appropriate Tax Type by marking one of the options provided, such as Individual Income or C Corporation Income.
Fill in your personal information, including your last name, first name, middle initial, and if applicable, your spouse’s details.
Enter your Taxpayer SSN or ITIN and your spouse's SSN or ITIN if applicable. Also, provide your FEIN.
Complete your address details including street address, city, state, and zip code.
Mark the box next to each document you are submitting to ensure all required documentation is included.
Sign and date the form at the bottom to validate your submission before finalizing it in our platform.

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Versions	Form popularity	Fillable & printable
2021	4.8 Satisfied (151 Votes)
2020	4.8 Satisfied (148 Votes)
2019	4.3 Satisfied (141 Votes)
2018	4.3 Satisfied (50 Votes)
2015	4 Satisfied (30 Votes)
2013	3.8 Satisfied (44 Votes)
2010	4 Satisfied (45 Votes)

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What does it mean to e-file your taxes?

eFile is an electronic method of filing and paying state and/or federal taxes using NCDOR-approved, commercial tax preparation software. eFile is a partnership program offered by the IRS (federal), NCDOR (state), and participating software providers.

Can you eFile in Colorado?

Colorado Courts Efiling is only available for certain case types. The system is only available in domestic relations (DR) and eviction cases. Remember to Opt-In to connect your CCE E-Filing account with the court system if you have an existing case.

How do I upload documents to my tax return?

You can upload your completed records directly to myTax from the myDeductions tool in the ATO app. If you use a registered tax agent, you can email your records directly to them.

What is an e-filer attachment form in Colorado?

Supporting documentation for electronically filed returns is called an e-filer attachment. Using Revenue Online(opens in new window) to submit your e-filer attachments allows for quicker processing than sending it via standard mail.

What do I need to attach to my tax return?

A W-2 form from each employer. Other earning and interest statements (1099 and 1099-INT forms) Receipts for charitable donations; mortgage interest; state and local taxes; medical and business costs; and other tax-deductible expenses if you are itemizing your return.

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How to attach tax documents?

You can attach certain documents to your e-filed return on the File Attachments screen in the Final Steps menu. If you only have a paper copy and not an electronic copy of a document, youll need to scan it or take a clear picture of it to upload it.

How do I upload a tax file?

How do you attach documents to your taxes?

From the Main Menu of the tax return (Form 1040) select: Personal Information. Other Categories. Attach PDF Document. New - navigate to the document, select it, then click Open.

E filer attachment 2026

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