Telephone Number Colorado Department of Revenue 2026 Call
A direct phone-number guide for people searching “Colorado Department of Revenue phone number.” Use this page to find the correct Colorado DOR taxpayer helpline, Taxation phone hours, Collections number, EFT help, SUTS support, Hearings Division number, DMV confusion, service center callback tips and the exact information to prepare before calling.
Quick Answer: Colorado Department of Revenue Phone Number
The main Colorado Department of Revenue Taxation phone number is 303-238-7378. This is the Taxpayer Helpline for Colorado state tax questions such as income tax, refund questions, Revenue Online access, tax letters, payments, business tax questions, sales tax questions and general Taxation Division help. Taxpayer Service Representatives are available Monday through Friday, 8:00 a.m. to 4:30 p.m. Mountain Time, except on state holidays.
Main taxpayer number
Call 303-238-7378 for Colorado state tax help. Translation service is available by request once connected to a representative.
Collections number
Call 303-205-8291 for Colorado DOR Collections, payment plan and tax bill questions.
DMV warning
Colorado DMV is part of DOR, but driver license, title, plates and registration questions usually need DMV or county motor vehicle office help.
Colorado DOR Main Phone Number: 303-238-7378
Use this phone number first when your issue is a Colorado state tax issue and you are not sure which unit handles it.
| Phone item | Direct answer | What to know before calling |
|---|---|---|
| Main Colorado DOR Taxpayer Helpline | 303-238-7378 | Use for Colorado Taxation Division help, letters, refunds, filing, Revenue Online and general state tax questions. |
| Phone hours | Monday–Friday, 8:00 a.m.–4:30 p.m. MT | Closed on state holidays. Call volume can be higher near filing deadlines and refund season. |
| Language help | Translation service available by request | Request translation after connecting to a Taxpayer Service Representative. |
| Scheduled callback | Available from Taxpayer Services through the official phone page | Add 303-238-7378 as a trusted contact so the scheduled call is not blocked as spam. |
| Secure message alternative | Revenue Online secure message | Secure messages may take 4–6 weeks for response, so call if you need faster assistance. |
Colorado Department of Revenue Phone Directory 2026
Use this directory to avoid waiting on the wrong line. The main taxpayer helpline can help route general tax questions, but specialized units have direct numbers.
| Colorado DOR need | Phone number | Best use |
|---|---|---|
| Taxpayer Helpline | 303-238-7378 | General Colorado tax help, income tax, refund questions, Revenue Online, tax letters and account questions. |
| EFT / electronic payment help | 303-205-8333 | Electronic funds transfer and electronic payment questions. |
| SUTS support | 720-795-7759 | Sales & Use Tax System support. |
| Collections | 303-205-8291 | Tax bills, collections notices, payment plans and collection account questions. |
| Bankruptcy | 303-866-3711 | Bankruptcy-related Colorado tax issues. |
| Compliance | 303-866-3711 | Compliance-related tax issues. |
| Discovery | 303-205-8292 | Discovery unit questions. |
| Excise Tax Unit | 303-205-8287, option 1 | Cigarette, liquor, nicotine, marijuana and tobacco products tax questions. |
| Fee Unit | 303-205-8287, option 2 | Motor vehicle daily rental, oil and gas production, prearranged ride, prepaid wireless and PUC fee questions. |
| Fraud and Tax Evasion | 303-205-8262 | Report tax evasion or fraud concerns. |
| Fuel Tax / IFTA | 303-205-8205 | Fuel tax and International Fuel Tax Agreement questions. |
| Special Event Sales Tax | 303-866-5643 | Special event sales tax questions. |
| Hearings Division | 303-205-5606 | Administrative hearings related to DMV, tax, liquor, marijuana, auto industry, racing and other DOR matters. |
| CDOR Information Line | 303-205-8411 | General Colorado Department of Revenue information line; not always the fastest path for tax account questions. |
| Executive Director’s Office | 303-866-4622 | Executive office inquiries; not routine tax refund, payment or DMV service help. |
Colorado DOR Phone Helper: Which Number Should You Call?
Choose your situation and this helper points you to the best official Colorado DOR phone route. It does not collect personal data.
Select what you need. The helper will show the phone number, what to prepare and the common call mistake to avoid.
Colorado DOR Refund Phone Number: When To Call and When Not To Call
For Colorado refund questions, start with the official refund status tools and Revenue Online before calling. If you still need help, the Taxpayer Helpline is 303-238-7378. Calling too early or without the exact tax year, return type and refund amount can slow the conversation.
Before calling about a Colorado refund
- Check Where’s My Refund or Revenue Online first.
- Confirm the Colorado return was actually filed and accepted.
- Have SSN/ITIN or Colorado Account Number ready.
- Know the tax year and return type.
- Have the expected refund amount from the filed return.
- Read any Colorado DOR letter before calling.
Call script for refund questions
“I am calling about my Colorado state refund for tax year _____. I filed on _____. My expected refund is $_____. I checked Revenue Online / Where’s My Refund and the status says _____. I have letter ID _____ if needed.”
Colorado DOR Collections Phone Number: 303-205-8291
Call Colorado DOR Collections at 303-205-8291 if your issue involves a Colorado tax bill, collections notice, payment plan, delinquent account or balance-due collection question.
| Collections topic | Direct answer | What to prepare |
|---|---|---|
| Collections phone | 303-205-8291 | Prepare notice, account number, tax period, bill amount and payment records. |
| Collections hours | Monday–Thursday, 8:00 a.m.–4:30 p.m.; Friday, 9:00 a.m.–4:30 p.m. | Holiday closures can apply. Check official pages if calling near a state holiday. |
| Payment plan | Call 303-205-8291 with the tax bill handy. | Be ready to discuss monthly payment amount and follow written agreement terms. |
| Mailing address | Colorado Department of Revenue, Attn: Collections, P.O. Box 17087, Denver, CO 80217-0087 | Use the address from the notice if the notice gives a more specific route. |
Colorado Business Tax Phone Help: Sales Tax, Withholding, EFT, Excise and Fuel Tax
Business taxpayers may need the general Taxpayer Helpline or a specialized unit. Use the table below to avoid calling the wrong division.
| Business issue | Phone number | Prepare before calling |
|---|---|---|
| General business tax account | 303-238-7378 | Colorado Account Number, FEIN, tax type, filing period and letter ID. |
| EFT / electronic payment | 303-205-8333 | Payment date, bank confirmation, payment amount and account number. |
| SUTS support | 720-795-7759 | SUTS account, filing period, jurisdiction, error message and return details. |
| Excise tax | 303-205-8287, option 1 | Product type, license/account, filing period and tax notice if applicable. |
| Fee Unit | 303-205-8287, option 2 | Fee type, reporting period, return/payment records and account number. |
| Fuel Tax / IFTA | 303-205-8205 | IFTA account, fuel records, mileage records, tax period and notice details. |
| Special Event Sales Tax | 303-866-5643 | Event name, event date, location, sales records and special event license details. |
Colorado SUTS Phone Number: Sales & Use Tax System Support
For Sales & Use Tax System support, Colorado DOR lists 720-795-7759. Use SUTS for state-administered and participating home-rule sales/use tax filing, and use Colorado sales tax lookup tools for address-based rates.
Call SUTS support for
- SUTS login or account access problems.
- SUTS return filing errors.
- Sales/use tax filing support inside SUTS.
- Participating home-rule filing questions.
- Payment submission issues in SUTS.
- Technical or portal-specific support.
Do not use SUTS phone for
Individual income tax refunds, DMV license questions, Collections payment plans, hearings, driver records, vehicle plates or federal IRS issues. Use the Taxpayer Helpline, Collections, Hearings, DMV or IRS path instead.
Colorado DOR DMV Phone Confusion: Taxation vs Driver License vs Vehicle Registration
Colorado DMV is part of the Colorado Department of Revenue, but DMV questions are not the same as tax questions. The Taxpayer Helpline is usually not the right line for driver license, ID card, vehicle title, plate, registration, insurance or county motor vehicle questions.
Use DMV or county motor vehicle offices for
- Driver license or state ID renewal.
- REAL ID questions.
- Vehicle title or registration renewal.
- License plates, tabs and stickers.
- County motor vehicle office appointments.
- Driver record or license status questions.
Use Taxation for
- Colorado income tax.
- Refund status and Revenue Online.
- Sales and use tax.
- Withholding tax.
- Tax notices and payments.
- Collections and payment plans.
Colorado DOR Hearings Division Phone Number: 303-205-5606
The Hearings Division conducts administrative hearings related to licenses and business licenses granted, denied or revoked by a division of the Colorado Department of Revenue. For general hearing questions, call 303-205-5606.
| Hearings issue | Best phone route | Prepare before calling |
|---|---|---|
| General Hearings Division question | 303-205-5606 | Hearing notice, case number, deadline and division involved. |
| Motor vehicle hearing | Hearings Division or DMV hearing instructions | License number, notice, suspension/revocation details and deadline. |
| Tax hearing | Use notice instructions or Hearings Division contact | Tax type, letter ID, account number, protest and supporting records. |
| Regulatory hearing | Use official regulatory hearing contact instructions | Division, case matter, rulemaking/proceeding details and email instructions. |
Colorado DOR Callback and Phone Appointment Tips
Colorado’s official phone page offers a Taxpayer Helpline call scheduler. If you schedule a call, add 303-238-7378 as a recognized contact so your phone does not treat the callback as spam.
Include in the callback request
- Your name.
- A 10-digit U.S.-based phone number.
- Colorado Account Number or Letter ID if you have it.
- Tax type, such as individual income tax, sales tax or withholding tax.
- A short issue summary.
Callback expectations
The official phone page says to expect a call within about 10 minutes of the scheduled appointment time. If you miss the call, use the official scheduling or contact page again instead of calling unknown numbers back.
Colorado DOR Call Checklist: What To Prepare Before Dialing
A prepared call is usually shorter and more useful. Use this checklist before calling Colorado DOR.
For individuals
- SSN or ITIN.
- Tax year involved.
- Colorado return copy.
- Expected refund amount, if calling about a refund.
- Letter ID or notice ID.
- Payment confirmation, bank record or check copy.
- Revenue Online username or account access details if relevant.
For businesses
- Colorado Account Number.
- FEIN and legal business name.
- Tax type: sales tax, withholding, SUTS, excise, fuel, fee or income tax.
- Filing period and return confirmation.
- Payment amount and confirmation number.
- Error message or screenshot note if calling about online filing.
- Name and authority of the person calling.
Colorado DOR Phone Scam Safety: Verify Before You Pay
Tax phone scams can imitate official agencies. Use official Colorado DOR pages and typed phone numbers before sharing personal information or making payments.
| Suspicious sign | Safer response | Official route |
|---|---|---|
| Caller demands immediate payment by gift card, crypto or wire transfer. | Do not pay. Hang up and verify through official DOR contact pages. | Call 303-238-7378 for tax questions or 303-205-8291 for Collections. |
| Text message includes a shortened payment link. | Do not click the link. Type the official Colorado DOR website yourself. | Use tax.colorado.gov or Revenue Online. |
| Caller asks for full SSN and bank details before proving the issue. | Ask for the notice, tax year and official contact method; verify separately. | Use the official contact page or notice instructions. |
| Caller says police will come immediately unless you pay. | Treat as suspicious. Verify through official DOR channels. | Use official Taxation, Collections or DMV pages depending on the topic. |
Colorado Department of Revenue Phone Number FAQs
Visible FAQs below match the FAQPage schema included at the end of this article.
What is the Colorado Department of Revenue phone number?
The main Colorado Department of Revenue Taxpayer Helpline is 303-238-7378.
What are Colorado DOR taxpayer helpline hours?
Taxpayer Service Representatives are generally available Monday through Friday, 8:00 a.m. to 4:30 p.m. Mountain Time, except on state holidays.
Does Colorado DOR offer language translation by phone?
Yes. Colorado DOR says language translation service is available over the phone. Request translation once connected to a Taxpayer Service Representative.
What is the Colorado DOR Collections phone number?
The Colorado DOR Collections phone number is 303-205-8291.
What are Colorado DOR Collections hours?
Collections hours are listed as Monday through Thursday, 8:00 a.m. to 4:30 p.m., and Friday, 9:00 a.m. to 4:30 p.m.
What is the Colorado DOR EFT phone number?
The EFT and electronic payment help number is 303-205-8333.
What is the Colorado SUTS support phone number?
The Sales & Use Tax System support phone number is 720-795-7759.
What is the Colorado DOR fraud and tax evasion phone number?
The fraud and tax evasion phone number is 303-205-8262.
What is the Colorado DOR Fuel Tax or IFTA phone number?
The Fuel Tax and IFTA phone number is 303-205-8205.
What is the Colorado DOR special event sales tax phone number?
The Special Event Sales Tax phone number is 303-866-5643.
What is the Colorado DOR Hearings Division phone number?
The Colorado DOR Hearings Division phone number is 303-205-5606.
What is the Colorado DOR Executive Director phone number?
The Executive Director’s Office phone number is 303-866-4622. For routine tax account questions, use the Taxpayer Helpline instead.
What is the Colorado DOR general information line?
The CDOR Information Line is listed as 303-205-8411.
Should I call Colorado DOR for DMV questions?
Usually no. Driver license, ID card, title, plates and registration questions should start with Colorado DMV or your county motor vehicle office.
What should I prepare before calling Colorado DOR?
Prepare SSN or ITIN, Colorado Account Number if applicable, tax year, tax type, letter ID, filing period, refund amount, payment confirmation and a short issue summary.
Can I schedule a Colorado DOR callback?
Yes. The official Contact Us By Phone page offers a Taxpayer Helpline call scheduler. Add 303-238-7378 as a trusted contact so the call is not blocked.
How fast will Colorado DOR answer a secure Revenue Online message?
Colorado DOR says secure messages through Revenue Online may take 4–6 weeks for a response. Call the Taxpayer Helpline if you need faster assistance.
What number should I call for a Colorado tax bill or payment plan?
Call Collections at 303-205-8291 and have your tax bill, account information and payment records ready.
What number should I call for Colorado state refund help?
Start with Where’s My Refund or Revenue Online. If you still need help, call the Taxpayer Helpline at 303-238-7378.
Is this website the official Colorado DOR website?
No. This is an independent informational guide. Use official Colorado DOR, Taxation Division, Revenue Online and DMV pages for final phone, filing, payment, refund and legal decisions.
Final Recommendation: Call the Right Colorado DOR Number First
For most Colorado state tax questions, call the Taxpayer Helpline at 303-238-7378, Monday through Friday, 8:00 a.m. to 4:30 p.m. MT, except state holidays. For Collections or payment plans, call 303-205-8291. For SUTS, call 720-795-7759. For EFT help, call 303-205-8333. For DMV questions, use Colorado DMV instead of the Taxation helpline.
Last editorial update: June 7, 2026. Verify final phone, callback, payment, refund, DMV and legal tax details on official Colorado Department of Revenue pages.