Overview

Colorado has one of the most complex sales tax systems in the United States, and Amazon third-party sellers need to understand how it works. As a marketplace facilitator, Amazon handles certain tax collection duties on behalf of sellers — but Colorado's unique "home rule" system means sellers may still have independent tax obligations on some orders shipped to the state. This guide breaks down what Amazon collects, what sellers remain responsible for, and how to identify affected orders.

Key Points / What Sellers Need to Know

• Amazon is a marketplace facilitator (MPF) — Under Colorado law, Amazon qualifies as a marketplace facilitator, meaning it is responsible for calculating, collecting, and remitting certain sales and use taxes on third-party seller orders.
• State-administered taxes are handled by Amazon — Amazon collects and remits state, county, and special district taxes that fall under Colorado's state-administered tax system.
• Home rule jurisdiction taxes may be the seller's responsibility — Colorado has dozens of cities and towns that self-administer their own sales taxes. Unless these home rule jurisdictions have enacted their own marketplace facilitator ordinances, Amazon cannot collect their local taxes — and the obligation falls on the seller.
• The retail delivery fee is collected by Amazon — Colorado's retail delivery fee applies to qualifying orders shipped to the state, and Amazon collects this fee from buyers on applicable transactions.
• Sellers should consult a tax professional — Given the complexity of Colorado's split tax system, Amazon recommends that sellers work with a qualified tax advisor to understand their specific obligations.

How Colorado's Split Tax System Works

Colorado's tax landscape is unlike most other states because it operates under a dual system. The state government administers taxes for the state rate, most counties, and many special districts. However, a significant number of cities — known as home rule jurisdictions — have the authority to levy and collect their own sales taxes independently. This creates a situation where a single order shipped to a Colorado address may involve taxes administered by two separate entities. Amazon handles the state-administered portion, but unless a home rule city has passed its own marketplace facilitator ordinance, Amazon has no legal authority to collect that city's tax. The result is that sellers may owe home rule city taxes on orders even though they did not collect them from the buyer.