$123,480 difference over 30 yearsFor an identical retiree (age 60, $2M, 60/40, $80K real spend), QuantCalc's Monte Carlo study found a median 30-year state-tax gap of $123,480 between California and Arizona — Arizona is the cheaper state. That money stays invested, which is why Arizona's median terminal balance is higher.
California vs Arizona at a glance
| Factor | California | Arizona |
|---|---|---|
| State income tax | 13.30% top | 2.50% top |
| Taxes Social Security | No | No |
| Taxes 401(k)/IRA | Yes | Yes |
| State estate/inheritance tax | No | No |
| Tax on $100k withdrawal | $12,300/yr | $2,500/yr |
| Retirement-friendliness | high tax | friendly |
| 30-yr median state tax (MC) | $154,980 | $31,500 |
| 30-yr success rate (MC) | 69.03% (#51) | 75.24% (#14) |
| Median terminal balance (MC) | $695,612 | $932,303 |
The income-tax difference, year by year
The simplest way to see the gap: on a steady $100,000 annual retirement withdrawal, California collects about $12,300 in state income tax and Arizona collects about $2,500 — a difference of roughly $9,800 every year. The highest top marginal rate in the U.S., with a mental-health surcharge on income above the surtax threshold. One flat bracket since the 2023 reform, exempts Social Security.
California reaches 13.30% only above $1,000,000 of taxable income: a 12.30% bracket rate plus a 1.00% surcharge on the excess. Every dollar figure on this page uses the 12.30% bracket rate, because a $100,000 annual withdrawal never reaches that threshold.
Over a 30-year retirement, QuantCalc's Monte Carlo simulation (identical portfolio and spending in both states, only the tax code changes) puts the median lifetime state-tax difference at $123,480 — and because the saved tax stays invested and compounds, Arizona's median ending balance is the higher of the two.
Beyond income tax
State income tax is only part of the retirement-cost picture. When comparing California and Arizona, also weigh:
- Property tax — a tax-free-income state can still have high property tax; factor your home value.
- Sales tax — affects every dollar you spend, not just income.
- Estate / inheritance tax — California: none; Arizona: none. Matters for larger estates.
- Roth conversion cost — converting in the lower-income-tax state of the two cuts the state tax on each converted dollar. See conversion-tax scenarios.
See California vs Arizona on your full plan
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Deep-dive either state: California retirement tax guide · Arizona retirement tax guide. Or see the full 50-state comparison and the 51-state Monte Carlo study.
FAQ
Is California or Arizona better for retirement taxes?
On state income tax, Arizona is the lighter-tax state. In QuantCalc's 30-year Monte Carlo study, a representative retiree paid a median of $31,500 in state tax in Arizona versus $154,980 in the other — a $123,480 lifetime difference on identical income and spending.
Does California tax Social Security and 401(k) withdrawals?
California does not tax Social Security benefits and taxes 401(k)/traditional IRA distributions at the state level. The highest top marginal rate in the U.S., with a mental-health surcharge on income above the surtax threshold.
Does Arizona tax Social Security and 401(k) withdrawals?
Arizona does not tax Social Security benefits and taxes 401(k)/traditional IRA distributions at the state level. One flat bracket since the 2023 reform, exempts Social Security.
How much would moving from California to Arizona save on retirement taxes?
On a $100,000 annual withdrawal, the state income tax is about $12,300 in California versus $2,500 in Arizona — roughly $9,800 per year of difference. Over 30 years, the Monte Carlo median gap was $123,480. Don't forget property tax, sales tax, and estate tax also differ — see the table above.
Last updated 2026-08-23. State tax data 2026 (Tax Foundation + state DoR). Monte Carlo figures from the QuantCalc 51-state study (2026-05-12, CC-BY-4.0): identical age-60 / $2M / 60-40 / $80K-real-spend retiree in each state. Educational only, not tax advice.