Arizona vs California Taxes — What Actually Changes When You Move

Most articles comparing Arizona and California taxes are written to make one state look obviously correct. This one is written to tell you which numbers actually move when you cross the state line, where the real surprises are, and which questions belong to a professional rather than a website.

I am a REALTOR®, not a tax adviser. Everything below is sourced and linked so you can check it, and the parts that genuinely need a CPA are flagged as such.

Income tax: the clearest difference

This is the comparison that needs the least explaining.

Arizona applies a 2.5% flat rate to all taxable income. California runs a graduated scale across 13 brackets, starting at 1.0% and reaching a top marginal rate of 13.3% on income above $1,000,000 for single filers. The Tax Foundation also notes an additional 1.1% payroll tax on California wages, which brings its combined top rate to 14.4%. Both figures are for tax year 2025.

Two things worth being precise about, because they are where people miscalculate:

• A marginal rate is not your rate. California's 13.3% applies only to income above the threshold, not to the whole amount. Most people comparing the two states are comparing an effective rate far below the headline.
• The flat rate cuts both ways. Arizona's 2.5% applies to lower incomes too, where California's graduated scale starts at 1.0%. For a modest income the gap is smaller than the headline numbers suggest — and can invert.

Property tax: where Proposition 13 changes the whole question

The headline rates make Arizona look cheaper. Effective property tax rates on owner-occupied housing run roughly 0.21%–0.70% by county in Arizona against 0.26%–0.89% in California (Tax Foundation, 2024 five-year estimate).

But those rates are close enough that they are not the story. The story is Proposition 13.

California assesses property at its purchase price and caps annual increases in assessed value at 2%. Someone who bought a California home in 1998 may be paying property tax on an assessed value that bears no relationship to what the house is worth now. That is a genuinely large benefit, and it is one you give up when you sell.

Arizona has no Proposition 13 equivalent. When you buy here, you are assessed at or near current market value. Arizona does cap how fast the Limited Property Value can grow year to year, so you are protected from runaway increases — but you do not inherit a decades-old basis.

So the honest answer to "will my property taxes go down?" is: it depends entirely on how long you owned the California house. A recent California buyer will very likely pay less here. A forty-year owner in Pasadena may find their Arizona bill is higher in dollar terms despite a lower rate, even on a cheaper house. Run your actual numbers — the county assessor publishes the parcel data for any Arizona home you are considering.

The one most people do not plan for: capital gains on the California sale

This is the item I see catch people, and it happens on the California side before Arizona is even relevant.

California taxes capital gains as ordinary income. A primary residence held for decades in a market that has done what Southern California has done can produce a gain that exceeds the federal exclusion ($250,000 single, $500,000 married filing jointly, subject to eligibility). Improvements you made over the years can adjust your basis — if you kept the records.

This is not something to discover at closing. Talk to a CPA before you list, because the answer sometimes changes the timing or the structure of the sale, and after the fact there is nothing to be done.

What does not change

Worth saying plainly, because comparison articles tend to imply everything is different:

• Federal tax is federal tax.
• Your mortgage interest deduction rules do not change by state.
• Sales tax exists in both states, and combined state-and-local rates in parts of metro Phoenix are not low. If you are furnishing a house, that is a real cost.
• Home insurance is priced on risk, not on state tax policy — get quotes on the specific property, early.

What this actually means for a move

The tax picture usually favours Arizona, but it is rarely the reason the move makes sense on its own. For most people the housing cost difference is a much larger number than the tax difference — that comparison, with current sourced figures, is set out in the California-to-Arizona relocation guide.

The practical sequence that works:

1. Get a CPA's read on your California sale before you list it.
2. Price an actual Arizona home in an area you would genuinely consider, and pull the real parcel tax record for it from the county assessor.
3. Build the monthly number from those two, including cooling and insurance — not from a cost-of-living index.

Then you are comparing reality to reality.

Sources

• Individual income tax rates: Tax Foundation, State Individual Income Tax Rates, tax year 2025.
• Effective property tax rates: Tax Foundation, Property Taxes by State and County, 2024 five-year estimate.

Tax law changes, and none of the above accounts for your particular circumstances. Confirm anything you intend to rely on with a qualified tax professional or the relevant state revenue department.