Colorado sales tax debt: what the Department of Revenue can do and your options
Last updated · Reviewed for accuracy against IRS.gov guidance
Colorado's state sales tax is 2.9%, administered by the Colorado Department of Revenue, which also collects many county, special-district and statutory-city taxes. But home-rule cities such as Denver can collect their own sales tax separately, so one business can owe several different agencies at once.
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Who collects Colorado sales tax
The Colorado Department of Revenue administers state sales tax at 2.9% — among the lowest state rates in the country. The Department also collects many county, statutory-city and special-district taxes, but self-collecting home-rule cities administer their own sales tax with their own returns, audits and collection.
Why Colorado balances are split
A Colorado seller behind on sales tax may owe the Department of Revenue for state and state-collected local tax and one or more home-rule cities separately. Each has its own notices and payment arrangements. List every jurisdiction on your notices before you call anyone — settling with the state doesn't touch a home-rule city balance. The state's Sales and Use Tax System (SUTS) lets businesses file for the state and participating home-rule cities in one place, but not every city participates.
Personal liability
Many states let the revenue agency assess owners and officers personally for sales tax a business collected but didn't remit. We haven't confirmed Colorado's specific rule on an official the Department of Revenue page, so we won't describe it here. If you were an owner, officer or bookkeeper with authority to pay bills, ask the Department of Revenue directly whether a responsible-person assessment applies — and read the federal Trust Fund Recovery Penalty guide if payroll taxes are also behind.
Disputes and next steps
Every the Department of Revenue assessment notice states how and by when to dispute it. We haven't summarized Colorado's appeal stages here because we couldn't confirm them on an official page — use the deadline printed on your notice, which is usually short.
Before calling, file any missing returns, keep the current period paid, and run the free business tax relief assessment to see which routes may be worth raising.
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Start the calculatorFrequently asked questions
What is Colorado's state sales tax rate?
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2.9%. Local rates are added and vary widely.
Why do I owe a Colorado city separately?
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Self-collecting home-rule cities administer their own sales tax, so their balances are billed and collected separately from the state.
What is SUTS?
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Colorado's Sales and Use Tax System, a portal for filing state and participating home-rule city sales tax in one place.
Does closing the business end Colorado sales tax debt?
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No. Closing stops new liability, but assessed tax, penalties and interest remain, and states often pursue the people responsible for collected-but-unremitted tax.
Where do I start if I'm behind on Colorado sales tax?
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File every missing return so the Department of Revenue can replace any estimated bill with real figures, pay the current period, then contact the Department of Revenue about the older balance.
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Sources
IRS figures on this page (rates, fees, thresholds) verified as of 2026-11-04. See our editorial policy.
TaxSettlementCalculator.com is not a tax firm, law firm, CPA, or government agency and is not affiliated with the IRS or any state tax agency. Estimates are for educational purposes only and are not tax, legal, or financial advice. Results vary based on individual circumstances, and no outcome is guaranteed. We connect users with independent tax relief professionals.