What it is

Transaction privilege tax (TPT) is the tax most people loosely call “Arizona sales tax.” Legally, though, it is something different. A true sales tax is imposed on the purchaser, with the seller acting as a collection agent. TPT is imposed on the seller for the privilege of conducting business in Arizona — it is, in effect, a gross receipts tax on the vendor.

The distinction is not cosmetic. Because the legal incidence falls on the seller, the seller is the party ultimately liable to remit TPT to the Arizona Department of Revenue. The seller may — and almost always does — pass the cost on to the customer as a line item, but the obligation to pay the state never leaves the seller.

Arizona’s state TPT rate is 5.6%, and counties and cities layer their own rates on top, so combined rates run considerably higher depending on where the sale is sourced. TPT applies to retail sales of tangible personal property and certain enumerated services.

Why it matters to a multi-state seller

For an out-of-state seller, the seller-side structure of TPT changes how risk works. With a conventional sales tax, if you fail to collect, the state can sometimes pursue the buyer for unpaid use tax. With TPT, the liability is structurally yours. If you should have been registered and remitting and weren’t, Arizona looks to you for the tax — you cannot simply point at the customer.

Arizona also reaches remote sellers. Since October 1, 2019, an out-of-state business that exceeds $100,000 in gross retail sales into Arizona has economic nexus and must obtain a TPT license and remit. The threshold phased down over time — $200,000 in 2019, $150,000 in 2020, and $100,000 from 2021 onward — and is measured on the previous or current calendar year.

One more wrinkle: sales made through a registered marketplace facilitator that collects TPT on your behalf are excluded from your threshold calculation, so only your direct sales count toward the $100,000.

Worked example

Your e-commerce company, based in Ohio, sells home goods nationwide. In 2025 you made $130,000 in direct retail sales shipped to Arizona customers, plus another $90,000 through a marketplace that collects TPT for you.

Only the $130,000 in direct sales counts toward Arizona’s threshold — the marketplace sales are excluded. Since $130,000 exceeds $100,000, you have economic nexus and must hold a TPT license and remit on your direct sales.

On a $1,000 direct order sourced to a location with a 5.6% state plus 2.9% combined county/city rate (8.5% total), you would charge the customer $85 and remit $85 of TPT to Arizona. Critically, that $85 is your tax obligation as the seller — the line item on the invoice merely passes the economic cost to the buyer. Had you not registered, Arizona could assess the full TPT due, plus penalties and interest, against your business.

State-level nuance

Arizona is the clearest example, but it is not the only state that taxes the seller’s gross receipts rather than the buyer’s purchase. New Mexico levies a gross receipts tax, and Hawaii imposes a general excise tax (GET) — both legally fall on the business, with the cost commonly shifted to customers. The practical effect for an out-of-state seller is similar: seller-side liability and the inability to deflect unpaid tax onto the buyer.

Within Arizona, a further nuance is the local layer. Many Arizona cities administer their own privilege taxes, and the combined rate depends on sourcing. For most retail sales the rate is determined by where the order is delivered, so a single Arizona registration still requires charging the correct combined state-plus-local rate per destination.

How this connects to staying compliant

Because TPT liability rests on the seller, the compliance priority for any multi-state seller shipping into Arizona is to (1) monitor direct sales against the $100,000 threshold, (2) register for a TPT license promptly once nexus is established, and (3) charge and remit the correct combined state-and-local rate by destination.

The same seller-liability logic governs New Mexico and Hawaii. Treating these gross-receipts-style states like ordinary buyer-side sales tax states is a common and expensive misread — the tax does not vanish if you forget to add it to the invoice; it simply becomes a cost you absorb plus penalties.

Sources: Arizona Department of Revenue — Transaction Privilege Tax: https://azdor.gov/business/transaction-privilege-tax Arizona Department of Revenue — Out-of-State Sellers Economic Threshold: https://azdor.gov/business/transaction-privilege-tax/retail-sales-subject-tpt/out-state-sellers/economic-threshold Sales Tax Institute — Economic Nexus State Guide: https://www.salestaxinstitute.com/resources/economic-nexus-state-guide