Two tax systems, one transaction
Every crypto disposal you make as a Phoenix resident gets looked at twice: once by the federal government and once by Arizona. They do not work the same way, and most confusion in this area comes from conflating them.
Federally, crypto is property. A disposal produces a capital gain or loss, and the rate depends heavily on how long you held it — assets held over a year get materially better treatment than assets held under a year. This is where the bulk of your tax bill lives and where the detailed transaction reporting happens.
Arizona is much simpler and much cheaper. It does not run its own capital-gains rate schedule at all. Your federal adjusted gross income — which already contains your crypto gains — flows through to Arizona Form 140 and gets taxed at a flat 2.5%. Same rate on wages, same rate on interest, same rate on a Bitcoin gain.
So when someone says Arizona is a good state to hold crypto in, that is the substance of the claim. It is not a tax haven and it does not touch the federal side. It just takes a small, flat and predictable slice where other states take a progressive and much larger one.
What Arizona charges, and why it's low
The flat 2.5% is the result of Arizona consolidating its brackets into a single rate, and it puts the state among the lowest-taxing in the country for investment income. For context on what that means in practice: on a fifty-thousand-dollar long-term crypto gain, the Arizona component is measured in hundreds of dollars, not thousands.
Arizona also makes no distinction between capital gains and ordinary income in its rate, and none between short and long-term gains. Everything is simply income at 2.5%. That sounds unfavourable compared with the federal system's preferential long-term rates, but it is not — because of the deduction described next.
The 25% long-term deduction
Here is the part that does the work, and it is routinely left out of national crypto tax guides.
Arizona allows a 25% deduction on net long-term capital gains. Apply that to the flat 2.5% and the effective state rate on a long-term crypto gain drops to roughly 1.875%. That is not a rounding error — it is a quarter off your Arizona liability purely for having held the asset more than a year.
Combine it with the federal long-term preference and the twelve-month holding line becomes the single most consequential date in an Arizona crypto holder's calendar. Both systems reward crossing it, independently, for different reasons.
The practical implication is straightforward and worth acting on: before any significant disposal, check how long you have held the specific lot you are about to sell. If you are within weeks of the year mark, that timing decision is worth real money in both directions. This is a conversation to have with a professional before pressing sell — see the cash-out page for the mechanics and the OTC page if the amount is large.
