Arizona HSA Tax Rules: The Lowest Flat Rate of Any Flat-Tax State
Arizona conforms to federal HSA tax treatment, and its flat rate happens to be the lowest of any flat-tax state in the country -- a genuinely simple picture, made simpler still by having no local income tax layer at all.
Key takeaways
- Arizona conforms to federal HSA tax treatment -- contributions, growth, and qualified withdrawals are all state-tax-free.
- Arizona's flat 2.5% rate is the lowest of any flat-tax state, completed a year ahead of its original 2024 target.
- Arizona has no city or county income tax -- the flat state rate is the entire picture.
Full conformity
Arizona follows federal HSA rules directly: contributions are deductible on the Arizona return, investment growth inside the account isn't state-taxed, and qualified withdrawals stay tax-free.
The lowest flat rate in the country
Arizona completed its transition from graduated brackets to a single flat rate in 2023 -- a year earlier than originally scheduled. At 2.5%, it's the lowest flat rate among every flat-tax state, including Pennsylvania's 3.07%, Indiana's roughly 3%, and Illinois's 4.95%. For HSA purposes, that means the simplest possible math: your contribution times 2.5% is your exact Arizona tax savings, full stop.
No local tax layer to check
Unlike a handful of other states in this guide series, Arizona has no city or county income tax layered on top of the state rate. Whether you live in Phoenix, Tucson, or a small unincorporated area, the 2.5% flat state rate is the complete picture -- there's no separate local determination to verify.
Sources: Arizona Department of Revenue; IRS Publication 969 for federal HSA treatment.
Your next step
Learn what applies to you, run your own numbers, then act on it.