Arizona R&D tax credit: 24% headline, partial refunds for small companies

Arizona posts the highest headline rate among major state research credits: as of mid-2026, 24% of the first $2.5 million of Arizona qualified research expenses over a base amount, and 15% of the excess — federal Section 41 definitions, in-state research, with an enhanced credit historically available for university-partnered research. For qualifying small companies (fewer than 150 full-time employees), a portion of otherwise-unusable credit is refundable through a capped, application-based program run with the Arizona Commerce Authority. Rates, tiers, caps, and carryforward vintages have all moved legislatively; verify with the Arizona Department of Revenue.

Computation: high rates on a real base

The definitional layer travels from the federal claim: four-part test, QRE categories, Arizona situs. The computation is incremental over a base amount in the federal regular-method mold, with the two-tier rate structure applied to the increment: 24% up to $2.5 million of excess QREs, 15% beyond. An additional credit for basic research payments to Arizona universities has been part of the design, encouraging in-state academic partnership. The tiering echoes Minnesota's shape at roughly double the rates — see the dimension framework for the pattern.

$1M increment$240k

$2.5M increment$600k

$5M increment$975k

$10M increment$1,725k

Illustrative: 24% of increment up to $2.5M, 15% above; ignores base computation detail and usage limits. As of mid-2026.

Refundability for small companies

The refund path is Arizona's distinctive monetization feature. A claimant with fewer than 150 full-time employees whose credit exceeds its current Arizona liability may apply — through the program administered with the Arizona Commerce Authority — to receive a portion of the excess (historically 75%) as a refund, surrendering the remainder. The program carries an annual statewide cap, applications are processed against it, and when the cap is reached the window closes for the year. The practical consequences: eligibility is a headcount test, the refund is a haircut deal (75 cents current versus 100 cents someday), and timing matters — companies that apply early in the year stand ahead of the cap.

For everyone else the credit is nonrefundable and nontransferable, with a carryforward that Arizona has shortened by vintage: older credits carried fifteen years, newer ones ten. Tracking vintages separately is required bookkeeping.

Who benefits

Small technology and aerospace-adjacent companies under the 150-employee line are the clear winners: 24% on the first tier plus a 75% refund path approaches the economics of the most generous programs anywhere. Larger claimants still do well on rate but revert to carryforward economics against Arizona's income tax. Weak fits: flat spenders (incremental base), companies just above the headcount line (no refund), and thin-sliver multistate filers — though Arizona's rates clear the claim-or-skip threshold at lower QRE levels than most states.

The trap: the cap and the clock

The refund program's annual cap is first-come, first-served in effect: a qualifying company that waits until the extended return deadline may find the year's refund capacity exhausted, converting an expected check into a carryforward. Sequencing the Arizona application ahead of routine compliance is the fix. Second trap: the carryforward shortening means a stale credit schedule built on the old fifteen-year assumption overstates the asset's life for recent vintages. And as everywhere in this cluster, every figure — rates, the $2.5 million tier break, the 150-employee test, the refund percentage, the cap — is as of mid-2026 and legislatively movable; the Department of Revenue and the Commerce Authority publish the controlling current-year terms.