How to Report Fraud
Colorado Department of Revenue (CDOR)
If you would like to report suspected tax fraud, please send us an online request through our Report Possible Tax Refund Fraud form or fill out a Citizen Informant Report and submit it to the address on the form.
Federal Internal Revenue Service (IRS)
To report suspected tax fraud to the IRS, complete the IRS Form 3949A and submit it to the address listed on the form. If you have questions, you may call the IRS Helpline at (800) 829-1040.
Missing W-2
You still must file your tax return with the IRS and the State of Colorado even if you do not receive your Form W-2. If you have not received your Form W-2 by February 15, you may use Form 4852 for the IRS and Form DR 0084 for the State of Colorado, and submit the forms with your returns.
Criminal Tax Investigations
The Criminal Investigation/Tax Enforcement Section (CTE) investigates and assists in the prosecution of individuals and corporations that attempt to evade taxes, willfully fail to file returns, submit false tax forms, and otherwise attempt to defraud taxpayers.
CTE investigates and aids in the prosecution of the Department of Revenue's most complex criminal and internal tax fraud cases by applying accounting and auditing principles to identify and develop tax crime cases and refer them to the proper judicial authority.
CTE preserves the integrity of the self-assessment tax system through the vigorous enforcement of the State of Colorado tax laws. CTE section works to convict violators, to deter future violations, and to reassure honest taxpayers that they will not bear an undue share of taxes.
Investigations conducted by CTE may involve failure to remit wage withholding, sales tax collected, tax evasion, failure to pay over tax, and preparer fraud (§39-21-118, C.R.S.). These cases can be related to criminal activity, corporate fraud, financial fraud, health care fraud, public corruption, organized crime and narcotics trafficking.
Frequently Asked Questions
Visit the Identity Theft web page for more information regarding identity theft reporting and prevention.
Fill out the DR 0084: Substitute Colorado W-2 Form and submit it to the address listed at the top of the form.
Contact the Criminal Tax Investigation Section of the Colorado Department of Revenue, and provide the license plate number using one of the methods below:
E-mail: dor_taxinvestigations@state.co.us
Fax: 303-866-5843
Phone: 303-205-8262
Visit the Taxpayer Identity Verification page for more information.
File a Wage Complaint with the Colorado Department of Labor & Employment (CDLE) by visiting their website or calling (303) 318-8441.
Complete a Citizen Informant Report and submit it to the Colorado Department of Revenue, Criminal Tax Investigation Section, using one of the methods below:
E-mail: dor_taxinvestigations@state.co.us
Fax: 303-866-5843
Phone: 303-205-8262
Contact United States Immigration and Customs Enforcement (ICE) by calling (866) 347-2423.
Complete IRS form 3949-A and submit to the IRS office address listed on the form.
Contact the Colorado Department of Revenue, Collections Section by calling (303) 205-8291.
Section 501(c)(3) status must be requested from the Internal Revenue Service. To get started, you can obtain IRS Publication 557 from www.IRS.gov or by calling (877) 829-5500.
Complete a Citizen Informant Report and submit it to the Colorado Department of Revenue, Criminal Tax Investigation Section, using one of the methods below:
E-mail: dor_taxinvestigations@state.co.us
Fax: 303-866-5843
Phone: 303-205-8262
Although the Criminal Investigation Section appreciates any information that can lead to an investigation and prosecution to recover tax payer funds, the Colorado Department of Revenue currently does not offer a reward or finder's fee for information regarding a tax crime.