Arizona Income & Tax for eCommerce Businesses

💡 TPT ≠ Traditional Sales Tax: Arizona's Transaction Privilege Tax (TPT) is technically imposed on the seller, not the buyer — even though most businesses pass it through to customers. This distinction matters: TPT applies to different business classifications at different rates, and the nexus rules for TPT differ slightly from a standard sales tax system. For most eCommerce sellers of physical goods, TPT functions similarly to sales tax in practice.

Part 1: Arizona Corporate Income Tax

Arizona imposes a 4.9% corporate income tax on the net income of C corporations with nexus in the state. This is a moderate rate compared to national averages. The tax is administered by the Arizona Department of Revenue (ADOR) and applies to taxable income apportioned to Arizona using a three-factor formula.

S corporations, partnerships, and LLCs taxed as partnerships do not pay Arizona corporate income tax at the entity level — their income passes through to individual owners, who pay Arizona's individual income tax.

What Creates Arizona Corporate Income Tax Nexus?

Arizona uses a broad nexus standard for its corporate income tax, encompassing both physical presence and economic activity. Nexus is established through:

• Owning or leasing real property or tangible personal property in Arizona — including FBA inventory in Arizona fulfillment centers

• Having employees, agents, or independent contractors in Arizona — even temporarily (more than two days per year can trigger nexus)

• Conducting business activities constituting a "regular, systematic, or substantial" presence in Arizona

• Soliciting sales in Arizona on a regular basis through representatives, advertising, or other means

Note: Arizona has not published a specific dollar threshold for corporate income tax economic nexus, unlike some other states. The "regular, systematic, or substantial" standard is fact-specific, making a nexus review advisable for any seller with significant, ongoing Arizona sales volume.

PL 86-272 in Arizona

Federal Public Law 86-272 can protect C corporations from Arizona corporate income tax if their only Arizona activity is soliciting orders for tangible goods approved and shipped from outside Arizona. However, FBA inventory in Arizona warehouses, employees or contractors in the state, and activities beyond pure solicitation eliminate this protection.

Part 2: Arizona Transaction Privilege Tax (TPT)

Economic Nexus Threshold

Arizona implemented economic nexus for remote sellers effective October 1, 2019, with the threshold settling at its current level effective January 1, 2021:

• $100,000 in gross retail sales to Arizona customers in the current or prior calendar year

• Marketplace sales through certified platforms like Amazon do not count toward your individual threshold — the marketplace handles those

• Once you exceed $100,000, your obligation to collect TPT begins on the first day of the month following 30 days after the threshold was met

• Trailing nexus: if you exceed the threshold in any year, you remain obligated for the remainder of that year and the entire following year, regardless of whether next year's sales drop below $100,000

Arizona's TPT Structure and Rates

Arizona's TPT has a state rate of 5.6% for the retail classification. Importantly, Arizona cities and counties also levy their own TPT, making it one of the most complex local tax environments for remote sellers:

• State rate: 5.6%

• County rates: typically 0.5% to 1.125%

• City rates: range from 1.5% to 3% in incorporated areas

• Combined rates: typically 8.3% to 11.2% depending on the customer's city and county

A TPT license is required (fee: $12) and must be renewed annually. Unlike some states, Arizona requires separate registration with individual cities for the city-level TPT in some jurisdictions. The AZTaxes.gov portal handles state-level registration.

Physical Nexus Triggers in Arizona

Certain activities create immediate TPT nexus in Arizona regardless of sales volume:

• Storing inventory in Arizona — including Amazon FBA fulfillment centers

• Having an employee, contractor, or agent present in Arizona for more than two days per year

• Owning or leasing any business property in Arizona

FBA Sellers: Arizona Fulfillment Centers

Amazon operates fulfillment centers in the Phoenix metropolitan area. FBA sellers with inventory placed in Arizona warehouses have immediate physical nexus for TPT purposes, regardless of their annual sales to Arizona customers. This is one of the most common untracked nexus exposures for FBA sellers in the West.

What About Sales Tax?

Arizona's city-by-city TPT complexity — with combined rates reaching over 11% in some Phoenix suburbs — makes it one of the more technically demanding sales tax states for eCommerce compliance.

At Tall Oak Advisors, we put together this guide as a resource for our eCommerce community. Tax rules vary significantly from state to state, and we want sellers to have the information they need to make informed decisions. More info at talloakadvisors.com

Disclaimer: The information in this article is for general informational purposes only and does not constitute legal or tax advice. Tax laws change frequently. Consult a qualified tax advisor or CPA regarding your specific situation.

Sources: A.R.S. § 43-1101 et seq. (Corporate Income Tax); A.R.S. § 42-5008 (TPT); ADOR — Economic Threshold Guidance (eff. Jan. 1, 2021); ADOR Nexus Program; Pub. L. No. 86-272.