Colorado E-Filer Attachment Form

E-Filer Attachment Form
DR 1778 E-Filer Attachment Form
DR 1778 (09/03/24)
COLORADO DEPARTMENT OF REVENUE
Denver CO 80261-0006
Tax.Colorado.gov

*DO=NOT=SEND*

E-Filer Attachment Form
Instructions for DR 1778
The Department strongly recommends that you submit these documents using the e-Filer Attachment
option at Colorado.gov/RevenueOnline, which eliminates the requirement to mail this form. Failure
to timely submit required documentation will result in denial of the related credit. Revenue Online
E-Filer Attachment provides you with a confirmation number and will be available to the Department
immediately.
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.
Mail to:
Colorado Department of Revenue
Denver, CO 80261-0006
You must resubmit your supporting documentation if you file an amended return. Do not return
this form in lieu of a payment form or if you are filing a paper return. This form is only
required if your taxes were e-filed and your software or preparer was unable to attach the
required documentation electronically.

This page was intentionally left blank.

DR 1778 (09/03/24)
COLORADO DEPARTMENT OF REVENUE
Denver CO 80261-0006
Tax.Colorado.gov
Page 1 of 1

*241778==19999*

E-Filer Attachment Form
For Tax Year (MM/DD/YY)

or Fiscal Year beginning (MM/DD/YY)

Income Tax Type
Individual
(DR 0104)

C-Corporation
(DR 0112)

Please print or type

Partnership/S-Corp
(DR 0106)

Fiduciary
(DR 0105)

Exempt Entity
(DR 0990)

Taxpayer’s Last Name or Business Name

Taxpayer’s First Name

Middle Initial

Spouse’s Last Name (if applicable)

Spouse’s First Name

Middle Initial

Taxpayer’s SSN or ITIN

Spouse’s SSN or ITIN (if applicable)

FEIN

Mailing Address

City

State

ZIP

Mark the box for the documents submitted. See the Colorado Department of Revenue, Taxation Division website at
Tax.Colorado.gov for more information about these credits.
Other state(s) income tax return(s)

W-2s, W-2Gs, and 1099s that show Colorado withholding

Enterprise Zone Credit: All applicable
OEDIT certificates

Job Growth Incentive Tax Credit: Certification letter from
the Colorado Economic Development Commission

Gross Conservation Easement: DR 1305, DR 1305G,
and supplemental documentation

Affordable Housing Credit: CHFA certification letter

Homeless Contribution Credit: Certificate(s)
issued by DOLA

Nonresident Partner, Shareholder or Members
Agreement: DR 0107

Innovative Motor Vehicle or Innovative Truck Credit:
Vehicle registration and the purchase/lease agreement

Qualifying Charitable Contribution Subtraction:
All applicable receipts

Child Care Contribution Credit: DR 1317

Colorado Agricultural Land Capital Gain Subtraction:
DR 1316

Claim for refund on behalf of deceased taxpayer:
DR 0102, death certificate, and, if applicable, court
documents
Other

Other documentation for credits/subtractions claimed
(mark the Other box below and enter details)

Explain

Signature of Taxpayer or Preparer

Date (MM/DD/YY)

This page was intentionally left blank.