Colorado Sales Tax Guide & Nexus Calculator (2026)

Colorado has the lowest state sales tax rate in the US at 2.9%, but that headline number is misleading — Home Rule municipalities add their own independent rates and administer their own taxes separately from the state. Remote sellers must understand both the state system and the Home Rule framework to be compliant.

Quick Reference

Criterion	Detail
State Rate	2.9%
Economic Nexus Threshold	$100,000 gross sales (rolling 12 months)
Transaction Threshold	None
Digital Goods / SaaS	Taxable
Typical Filing Frequency	Quarterly
SST Member	No
Registration Portal	Colorado Sales Tax (revenue.colorado.gov)

Economic Nexus

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Gross Revenue (USD)

$

Total Transactions (not required)

Enter your trailing 12-month revenue to calculate nexus status.

For informational purposes only · Not legal or tax advice · Consult a licensed tax professional · Rules as of 2026

Colorado’s economic nexus threshold is $100,000 in gross sales into Colorado in the current or prior calendar year. Once crossed, you must register with the Colorado Department of Revenue and begin collecting.

The threshold is based on gross sales, including marketplace-facilitated sales (Amazon, Etsy, eBay). Those platforms collect and remit Colorado sales tax on your behalf, but their sales still count toward your nexus threshold.

Colorado eliminated its 200-transaction alternative threshold before 2025. Only the revenue threshold applies.

Home Rule Complexity

Colorado has over 70 Home Rule municipalities — cities and towns that have the legal authority to impose and administer their own sales taxes independently of the state system. Home Rule cities include Denver, Aurora, Boulder, Fort Collins, Lakewood, and many others.

For remote sellers (no physical Colorado presence), the Home Rule complexity is partially mitigated by Colorado’s economic nexus rules: remote sellers are generally required to collect only the state and county/special district rates, not separately administered municipal rates, unless they have sufficient contacts in those Home Rule jurisdictions.

However, if you have a physical presence in Colorado (office, warehouse, FBA inventory, employees), you may need to register directly with each Home Rule municipality where you make sales. Each has its own registration, rate, form, and payment portal.

Practical recommendation: For pure remote sellers, the state-administered system handles most obligations. For sellers with physical Colorado presence, consult a Colorado-specific tax professional to map your Home Rule exposure.

Tax Rate and Product Taxability

Colorado’s rates stack as follows:

• State: 2.9%
• County: typically 0.25%–1%
• Special districts: typically 0.1%–1%
• Home Rule municipal (if applicable): typically 3%–4%
• Combined total in Denver: approximately 8.81%

The 2.9% state rate looks low, but combined rates in major Colorado cities run 8%–10%.

Product Categories

Taxable: Tangible personal property, digital goods (including SaaS), most retail goods.

Exempt: Prescription drugs, food for home preparation (groceries are exempt from state sales tax), agricultural supplies, and qualifying manufacturing equipment.

Food note: Colorado exempts most grocery items from state sales tax. Prepared food (restaurant meals, etc.) remains taxable.

Digital Goods and SaaS

Colorado taxes digital goods and SaaS under its sales tax framework. The Colorado DOR applies sales tax to:

• SaaS (software-as-a-service)
• Downloaded software (prewritten software)
• Digital content (music, ebooks, movies)
• Streaming services

Colorado’s digital goods taxability is relatively well-established compared to states with more ambiguous positions. If you sell software subscriptions or digital products into Colorado, they are taxable once you cross the $100,000 threshold.

Custom software (developed specifically for a single customer) may be treated differently from prewritten software — consult DOR guidance if you offer bespoke development services alongside standard SaaS.

Registration

Colorado does not participate in SST, so you must register directly with the state.

1. Go to Colorado’s sales tax portal: revenue.colorado.gov
2. Access “MyFTB” or the Colorado Sales Tax System
3. Complete the “CR 0100: Colorado Business Registration” form
4. Provide EIN, business type, and estimated Colorado sales
5. You will receive a Colorado Sales Tax Account Number

Note: Colorado has an additional layer — the Retailer’s Use Tax license, which applies to remote sellers. When registering, confirm you are registering for “Retailer’s Use Tax” if you are a remote seller without physical Colorado presence.

Foreign Sellers

Colorado accepts foreign business registrations. A US EIN is required. Colorado does not require a registered agent for remote sellers.

Filing Frequency and Deadlines

Colorado assigns filing frequency based on prior-year tax liability:

Annual Tax Liability	Filing Frequency
Less than $300	Annual
$300–$3,600	Quarterly
More than $3,600	Monthly

Quarterly due dates: Last day of the month following the quarter end (April 30, July 31, October 31, January 31).

Returns are filed electronically through the Colorado Sales Tax portal. Zero returns are required in periods with no Colorado sales.

Compliance Notes

Retail Delivery Fee: Colorado imposes a Retail Delivery Fee (RDF) on every retail delivery of tangible personal property into Colorado where the seller collects Colorado sales tax. As of 2026, the fee is $0.29 per delivery. This applies separately from sales tax and must be collected and remitted. Configure your platform to include the RDF on qualifying Colorado orders.

Home Rule for physical sellers: If you have physical nexus in Colorado (including Amazon FBA inventory in Colorado warehouses), audit which Home Rule municipalities you are selling into. Failure to register with Home Rule cities is a common audit trigger.

Marketplace sales: Amazon and other major platforms collect Colorado state and special district sales tax on your behalf. Your marketplace sales still count toward the $100,000 threshold.

No SST: Colorado is not an SST member. Multi-state SST registration does not cover Colorado.

Digital sellers: Colorado taxes SaaS, so digital-only sellers who cross $100,000 have full registration obligations.

Related Guides

• US Sales Tax Overview
• State Sales Tax Index — All 50 States
• Amazon FBA and Physical Nexus
• Stripe Tax for Digital Goods and SaaS
• Foreign Sellers Guide to US Sales Tax
• US Sales Tax Compliance Checklist