Table of Contents

1099 E-Filing: Colorado

Nina Tchistiakova Updated by Nina Tchistiakova

Due date

January 31

E-filing threshold

Must E-file if 10 or more

Filing options

Electronic filing

Forms to file

State requires W-2G and all 1099 statements listing Colorado withholdings. Form 1099-NEC must be filed separate from the other 1099's.

Transmittal form

If you file your 1099s or W-2Gs electronically, you will NOT need to file a DR 1106 or a DR 1101 unless you have requested a refund or there is a balance due. In the case of a refund requested or a balance due, you will need to submit a paper DR 1106 ( Payroll System does support) or DR 1101 ( Payroll System does not support) to the Department of Revenue.

Required file name

Any name with “.txt” at the end

E-filing website


Marc Maes 303-205-5252,

Michael Bailey 303-205-5290,

Submitting files

Register the submitter at least five days prior to submitting the file: Revenue Online.

If Colorado tax is withheld, payers are required to have a Colorado 1099 and/or W-2G withholding account and remit the tax.

If a payer files 1099 or W-2G withholding statements electronically through Revenue Online, the payer does not need to submit a DR 1106 or 1101 unless an amount appears on 3A (additional balance due) or 3B (a refund) of the return.

Anyone who will submit W-2s, 1099s, or W-2Gs– whether a tax professional, tax service provider and/or a person who does the payroll at the business – must register.

A) Go to Revenue Online at least five days before you plan to submit a file or type each W-2, 1099, or W-2G entry.

B) Click on the hyperlink to “Submit Year-End Withholding” under the heading “Additional Services.”

C) Click on the link Request Withholding Submitter Access.

D) Complete the requested fields.

A Confirmation will appear to confirm that the department has received the registration request. In most cases, the registration process is completed overnight; however, it may take up to five business days to complete.

When you have completed the registration process, you do not need to do it again.

Colorado does allow testing files on Revenue Online. The testing link will be available beginning October 1 through March 31 of the following year. You must have submitter access to be able to test a file through our system. You can request submitter access anytime prior to testing or submitting a year-end file. Please note, submitter access may take up to 5 business days to be granted. It is advised to do this well in advance of the January filing deadline. The testing link will be found under the Withholding Box on Revenue Online

Correcting 1099's/W2-G's

If a 1099 or W-2G is issued with any errors, the payee must send a corrected 1099/W2G to correct the error to the department on or before the due date of the original W-2 (January 31). If too little was withheld, the Department will send a bill to the payer for the difference. If too much was withheld, the payer must request a claim for refund for the difference. Submit the corrected 1099 or W-2G forms with a cover letter to:

Colorado Department of Revenue

Discovery Section Room 634

P.O. Box 17087

Denver, CO 80217-0087.

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