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United States · Colorado · Denver

Card processing rules for Denver merchants

This page covers what is actually different once you cross into Denver city limits — a sales tax administration Denver runs itself rather than through the state, and the combined rate that results from it.

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Denver runs its own sales tax office — it is not just a rate on top of Colorado's

In most states, a city's share of sales tax is one more line the state collects, audits and remits on the city's behalf. Colorado works differently. Colorado is a "home-rule" state, meaning municipalities with a home-rule charter can choose to administer and collect their own local sales and use tax rather than have the Colorado Department of Revenue do it for them. Denver made that choice decades ago and is a "self-collected" home-rule city, one of roughly 70 in Colorado according to the Department of Revenue's own local government sales tax guidance.

What that means for a business is concrete, not academic. Registering with the Colorado Department of Revenue for a state sales tax license does not register you with Denver. The City and County of Denver's Treasury Division requires its own business tax registration, issued through the Denver eBiz Tax Center, its own two-year sales tax license, and its own return filed and paid through the Denver eBiz Tax Portal — a system the city's own tax guide confirms does not participate in the state's Sales and Use Tax System (SUTS) or the Department of Revenue's filing system at all. A Denver business effectively carries two sales tax relationships in parallel: one with the state for the 2.9% state and RTD/SCFD district shares, and one with the city treasury for Denver's own 5.15%.

Where this actually bites a business

The practical failure mode is a business that assumes a Colorado sales tax registration covers Denver, discovers it does not during an audit or a lease renewal that requires a business license, and owes back filings plus penalties to the city on top of whatever it already paid the state. It is also a common point of confusion for a business relocating into Denver from a state-collected Colorado city or from another state entirely, since almost nowhere else works this way. If you are opening a Denver location and already file Colorado sales tax elsewhere in the state, treat the Denver registration as a separate task, not a formality.

9.15 percent inside standard Denver boundaries — and you pay card fees on it

The Colorado Department of Revenue lists the state sales tax rate at 2.9%. On top of that, the City and County of Denver's own published sales tax rate is 5.15%, collected under the home-rule arrangement described above. The remainder of Denver's combined rate comes from special district taxes administered at the state level — the Regional Transportation District and the Scientific and Cultural Facilities District among them — bringing the standard combined rate to 9.15% across the 53 ZIP codes the city's Treasury Division lists as standard. Specific addresses inside urban redevelopment areas or additional special taxing districts can carry a higher combined rate, so a business with more than one Denver-area location should confirm the exact rate at each address rather than assume the citywide figure applies everywhere.

That number matters for payments the same way it does everywhere a combined rate runs high: interchange and your processor's discount rate are calculated on the full authorized amount, and the full authorized amount includes the sales tax you collect and remit on the business's behalf. At 9.15%, roughly 8.4% of every card-funded ticket in Denver is money you never keep, and your effective processing rate is still applied to it in full. On a $100 pre-tax sale you authorize $109.15, and every basis point of markup lands on that larger number, not the smaller one.

We are not going to hand you a dollar figure for what that costs, because it depends entirely on your card mix, average ticket and pricing structure, and any processor who quotes a saving before reading your statement is guessing. What we will say is that a high combined rate like Denver's makes the choice between interchange-plus and a flat-rate program more consequential than it is in a lower-tax market, because a flat rate applies uniformly across the tax component while interchange-plus does not move the same way. That is a calculation worth running on your own numbers.

What changes for Denver dining rooms and stores

For a Denver restaurant, the home-rule registration point compounds with normal POS setup, because a new location opening in Denver needs both a state license and a separate Denver business tax license before the first sale rings through if the owner wants to avoid a retroactive filing problem later. Tip-adjusted tickets and the authorization-versus-settlement question that affects every restaurant nationally still apply on top of that; our restaurant payment processing hub covers the general mechanics of tip handling and settlement timing that a Denver restaurant faces along with everyone else.

For Denver retail, the 9.15% combined rate does most of the work, since retail tickets are fully taxable more often than restaurant tickets and the tax component sits well above the national median. Two retailers on the same Denver block can show very different effective processing rates purely from how much of their volume runs on cards that carry higher interchange, even before the tax component is factored in. Our retail payment processing hub sets out how to read that off a real statement.

Sources

Updated 18 September 2026. General information, not legal or tax advice. Rules change; confirm current rules with the Colorado Department of Revenue, the City and County of Denver, your attorney and your accountant before you register, file or change how you price.

Related pages

Denver FAQ

Denver merchant FAQ

Yes. Denver is one of Colorado's roughly 70 home-rule municipalities, and home-rule cities that elect to self-collect administer their own sales and use tax rather than filing through the state. The City and County of Denver's Treasury Division requires a separate business tax registration through the Denver eBiz Tax Center, a separate license, and a separate monthly or quarterly return, on top of whatever you file with the Colorado Department of Revenue. Denver does not participate in the state's SUTS portal.

9.15% inside the standard city boundary as of 2026: 2.9% Colorado state tax plus 5.15% City and County of Denver sales tax, with the balance coming from Regional Transportation District (RTD), Scientific and Cultural Facilities District (SCFD) and other special-district taxes layered in under state administration. Special districts and urban redevelopment areas inside Denver can push the rate higher at specific addresses, so confirm the rate for your exact location rather than assuming the citywide figure.

Colorado sets the rule statewide, not locally: C.R.S. § 5-2-212 caps a credit card surcharge at the lesser of 2% of the transaction or your actual merchant discount fee for that card type, requires specific sign and receipt wording, and bars surcharging debit and gift cards outright. Nothing in Denver's home-rule charter changes that cap or the required wording — the city's home-rule authority covers how it collects its own sales tax, not payment card surcharge law, which sits in the Colorado Consumer Protection Act. See our state-level guide for the exact wording the statute requires.

No. CELER Merchants is an independent merchant services agent and works remotely across Colorado and every other state we cover. Statement analysis, quoting, onboarding and support all run by phone, email and video, so nothing about your account depends on where our desk is.

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