Selling into Arizona: privilege tax, Phoenix heat and a summer cart discount plan
Two things set Arizona apart for a Shopify store, one in the statute book and one in the weather. The tax is a transaction privilege tax: the state's law describes it as a privilege tax measured by the amount or volume of business a person transacts, and for a remote seller the threshold is more than 100,000 dollars in gross proceeds from Arizona customers in the current or previous calendar year. The weather is Phoenix: the National Weather Service counted 70 days at 110 degrees or higher in 2024, in what it calls the warmest year recorded in Phoenix, and 37 in 2025. This page sets out the statutes and the weather records, then builds a cart discount plan around parcels that sit in heat.
Shipping into the state
Arizona covers 113,594 square miles of land, Phoenix recorded 37 days at or above 110 degrees in 2025 and Phoenix Sky Harbor lists 322,741 tons of cargo for 2025. No carrier rule on heat is cited on this page: if your product melts, softens or separates, check your carrier's own packaging guidance and test one parcel in the sun before you promise a delivery date.
Source: U.S. Census Bureau: State Area Measurements (2010)
Source: Phoenix Sky Harbor International Airport: Facts and numbers (2025)
Source: National Weather Service Phoenix: 2025 year in review (preliminary data)
A summer cart discount plan for heat-sensitive parcels
- Before the first 110 degree week
Sort your catalog into products that tolerate heat and products that do not, such as candles, cosmetics and chocolate. Phoenix recorded 70 days at or above 110 in 2024, so for the second group build the cart tier around lighter, sturdier items or add an insulated pack to the cost you plan for.
Source: National Weather Service Phoenix: 2024 year in review
- When you set the discount tiers
Count any insulated packaging or a cold pack in the cost of the tier, so the floor holds. A discount that looks safe at list cost can fall below your margin once a heat pack and a faster service are added. The discount floor post linked below gives the formula.
- When you write the banner
Promise a ship date, not an arrival date. A parcel that waits at a depot in a heat wave is a delay you do not control, and the 2025 record highs, 118 degrees on July 9 and Aug. 7, show how far the heat can run. The City of Phoenix puts the monsoon between June 15 and Sept. 30, with storms peaking between mid-July and mid-August, so the same ship date wording covers storm delays too.
Source: National Weather Service Phoenix: 2025 year in review (preliminary data)
- Each quarter
Total your gross proceeds from Arizona customers, leaving out sales a marketplace facilitator made for you. The statutory line is more than 100,000 dollars in the previous or current calendar year, so a summer promotion can push you across it within the year it runs.
Source: Arizona Revised Statutes: 42-5044, nexus and threshold
- When you test checkout
Order to an Arizona address from a store outside the state and look at the tax line. The statute sources a sale the seller receives outside Arizona to the purchaser's location in the state, and uses the billing address when there is no delivery address.
Build it with the Cart discount tiers template.
Requires: Growth plan or higher.
Questions merchants ask
- Is Arizona's transaction privilege tax a sales tax?
- The statute describes it as privilege taxes measured by the amount or volume of business transacted by persons on account of their business activities, so it is framed as a tax on business activity. This is not tax advice; confirm with the Arizona Department of Revenue.
- When does an out-of-state seller need an Arizona license?
- Section 42-5044 sets a nexus test of more than 100,000 dollars in gross proceeds or gross income from Arizona business in the previous or current calendar year for 2021 and later, excluding sales a marketplace facilitator made. Confirm your own position with the Department.
- How many 110 degree days does Phoenix get?
- The National Weather Service counted 70 in 2024, which it describes as part of the warmest year recorded in Phoenix, and 37 in 2025 on preliminary data. The count changes every year, so use the year in review for the latest.
- Does the sale go to the buyer's address for Arizona tax?
- For an order received at a business location outside Arizona, the statute sources the sale to the purchaser's location in the state, using the billing address if there is no delivery address.
- What carrier rules apply to heat-sensitive parcels?
- This page does not cite a carrier rule. Carriers publish their own packaging guidance for temperature-sensitive goods, and you should read your carrier's before you promise delivery in a Phoenix summer.
The year at a glance
Related reading
Facts and sources
Arizona Revised Statutes section 42-5008 describes the transaction privilege tax as privilege taxes measured by the amount or volume of business transacted by persons on account of their business activities.
Arizona Revised Statutes: 42-5008 (accessed October 10, 2026)
The statute defines a remote seller as a person that sells products for delivery into Arizona and has no physical presence or other requirement to hold a transaction privilege tax license except that its business exceeds the threshold in section 42-5044.
Arizona Revised Statutes: 42-5001, definitions (accessed October 10, 2026)
Under section 42-5044 a remote seller meets the nexus test when the gross proceeds of sales or gross income from its Arizona business, excluding sales facilitated by a marketplace facilitator, are more than 200,000 dollars in 2019, 150,000 dollars in 2020 and 100,000 dollars in 2021 and each later year, in the previous or current calendar year.
Arizona Revised Statutes: 42-5044, nexus and threshold (accessed October 10, 2026)
For a sale where the seller receives the order at a business location outside Arizona, section 42-5040 sources the sale to the purchaser's location in the state, and uses the purchaser's billing address when there is no delivery address.
Arizona Revised Statutes: 42-5040, sourcing (accessed October 10, 2026)
The National Weather Service's 2024 year in review for Phoenix counts 70 days at or above 110 degrees Fahrenheit, 143 days at or above 100 and 188 days at or above 90 against a normal of 173.4, and calls 2024 the warmest year recorded in the history of Phoenix.
National Weather Service Phoenix: 2024 year in review (accessed October 10, 2026)
For 2025, preliminary National Weather Service data list 37 days at or above 110 degrees, 122 days at or above 100 and 181 days at or above 90 in Phoenix, with 21 daily record highs set or tied (16 of them outright), including 116 degrees on June 30 and 118 degrees on July 9 and Aug. 7.
National Weather Service Phoenix: 2025 year in review (preliminary data) (accessed October 10, 2026)
Phoenix Sky Harbor lists 322,741 tons of cargo and 35,685 tons of mail for 2025 and ranks 24th in North America for cargo.
Phoenix Sky Harbor International Airport: Facts and numbers (2025) (accessed October 10, 2026)
The City of Phoenix states that the monsoon runs from June 15 to Sept. 30 and that storms peak between mid-July and mid-August.
City of Phoenix: Monsoon Resources (accessed October 10, 2026)
Arizona has 113,594 square miles of land area and 113,990 square miles in total.
U.S. Census Bureau: State Area Measurements (2010) (accessed October 10, 2026)
Cities in Arizona
- PhoenixPhoenix's February to March calendar, the WM Phoenix Open, Cactus League opener and Heard Indian Fair, plus the city tax rate and a buy X get Y offer plan.
Not tax advice. Confirm current rules with the state revenue department before you rely on a date or an exemption.
Run the Arizona plan in Freebies Engine by Log Studio Lab.
Requires: Growth plan or higher.