No. Arizona does not tax Social Security benefits. The state fully exempts Social Security income -- there is no income threshold, no phase-out, and no partial inclusion. If you live in Arizona, your Social Security benefit generates zero state income tax liability.

The federal picture is different. Up to 85% of your Social Security benefit can be subject to federal income tax depending on your combined income. For most retirees with IRA distributions or pension income, that is where the real exposure lives.

How Federal Social Security Taxation Works

The IRS uses a formula called combined income -- adjusted gross income plus nontaxable interest plus half of your Social Security benefit -- to determine what portion of your benefit is taxable. The result determines which of three inclusion tiers applies to your situation.

For a married couple filing jointly in 2026: combined income below $32,000 means none of the benefit is taxable. Between $32,000 and $44,000, up to 50% is taxable. Above $44,000, up to 85% of the benefit is included in federal taxable income. These thresholds have not been adjusted for inflation since 1993, which means nearly every retiree with IRA distributions, pension income, or meaningful investment income will hit the 85% bracket.

For a single filer, the thresholds are lower: below $25,000 is tax-free, between $25,000 and $34,000 triggers 50% inclusion, and above $34,000 triggers 85% inclusion.

What This Means for Arizona Retirees

Arizona's exemption means that Social Security planning for AZ residents is entirely a federal tax issue. The state has already removed itself from the equation. The planning work is about managing combined income to control how much of your benefit is taxable at the federal level -- not at the state level.

For households with large pre-tax IRA balances, RMDs will push combined income well above the $44,000 threshold and lock in 85% federal inclusion of Social Security. A household with $2 million in pre-tax accounts receiving $60,000 in combined Social Security will have approximately $51,000 of that benefit included in federal taxable income -- every year, for the rest of their lives, unless the pre-tax balance is reduced through proactive Roth conversions before RMDs begin.

Arizona's flat 2.5% income tax rate and Social Security exemption make it one of the most favorable states for retirement income. That context matters if you are comparing Arizona to states like Colorado, Montana, or New Mexico -- all of which partially tax Social Security -- or considering a move in retirement.

A Real Example: Tom and Linda, Scottsdale Retirees

Tom, 68, and Linda, 66, live in Scottsdale. Tom's Social Security benefit is $36,000 per year. Linda's is $22,000. They receive $58,000 in combined Social Security annually. They also take $80,000 per year in IRA distributions to cover living expenses.

Their combined income for federal purposes: $80,000 in IRA distributions plus $29,000 (half of their SS) plus minimal investment interest equals approximately $110,000. That is well above the $44,000 threshold. Result: 85% of their $58,000 in Social Security -- roughly $49,300 -- is included in federal taxable income.

Their Arizona state tax bill on that Social Security income: zero. Arizona sees none of it. Their Arizona taxable income reflects only the IRA distributions and investment income -- approximately $80,000 to $85,000. At 2.5%, their Arizona tax liability is roughly $2,000 to $2,100. The federal bill is materially larger.

The Social Security Tax Torpedo and How to Defuse It

There is a zone in the combined income formula where each additional dollar of income triggers not only its own marginal tax but also causes more of the Social Security benefit to become taxable. Tax professionals call this the "Social Security tax torpedo." In that zone, the effective marginal rate can spike well above the stated bracket rate.

For a household at the 22% federal bracket, adding a dollar of income in the torpedo zone can generate $1.85 of taxable income -- the original dollar plus $0.85 of additional Social Security inclusion. The effective marginal rate on that dollar is closer to 40.7%, not 22%.

The primary tool for defusing this is reducing the pre-tax account balance before RMDs and Social Security run simultaneously. Roth conversions in the years between retirement and age 73 -- when combined income is lower because RMDs have not yet begun -- compress the future pre-tax balance and reduce the RMD-driven income that feeds the torpedo zone. Arizona's 2.5% flat rate makes each conversion dollar slightly cheaper at the state level compared to higher-tax states, adding a marginal advantage to converting in Arizona.

Other Arizona-Specific Context

Arizona also exempts pension income from state income tax for qualifying recipients, though the details differ from the Social Security exemption. Military retirement pay is fully exempt. Federal civil service pensions and Arizona state pensions receive a partial exemption. Private pensions are taxable at the state level.

IRA and 401(k) distributions are taxable in Arizona at the ordinary income rate of 2.5%. Roth IRA distributions remain tax-free at both the federal and state level, provided the account is qualified. Capital gains in Arizona are taxed as ordinary income, also at 2.5%.

Taken together, Arizona's tax structure creates a clear hierarchy for retirement income: Roth distributions are cleanest, Social Security is second (federal tax only, no state tax), and pre-tax IRA/401(k) distributions carry the most tax load -- federal ordinary income rates plus 2.5% Arizona on top.