California to Idaho Retirement Taxes (2026): Every Tax That Changes

Updated July 25, 2026. Quick answer (2026): Moving from California to Idaho in retirement, withdrawals stay taxable, but the top rate falls from 13.3% to 5.695%. Four separate taxes change when you move — state income tax on withdrawals, state estate tax, state inheritance tax, and what probate costs your heirs. Most comparisons only price the first one.

California vs Idaho: every tax that changes

Every cell is quoted from our statute-cited 51-jurisdiction dataset. Download the full dataset as CSV.

1. What changes on your annual tax bill

Both states tax retirement withdrawals, so this is a rate change rather than an exemption. California runs graduated to 13.3% (plus existing 1% mental health surtax included in that top rate; against Idaho at flat 5.3% (cut from 5.695% by HB 40, 2025) — a top-rate difference of roughly 7.61 percentage points. On $100,000 of withdrawals that is on the order of $7,605 a year at the top of the schedule, before any exclusion either state allows.

California: Pensions, 401(k), and IRA distributions fully taxable as ordinary income — no age-based exclusion or retirement deduction. Idaho: Pensions, 401(k), and IRA distributions generally fully taxable.

2. What changes at death: state estate tax

Neither state levies an estate tax. California: none Idaho: none Only the federal estate tax applies.

3. What changes at death: state inheritance tax

Neither state levies an inheritance tax. California: none Idaho: none

4. The one nobody prices: what probate costs your heirs

California uses a statutory-percentage fee model (Cal. Prob. Code §10810 (attorney) and §10800 (PR) — identical schedules, each computed on gross estate value: 4% of first $100,000; 3% of next $100,000; 2% of next $800,000; 1% of next $9,000,000; 0.5% of next $15,000,000; court-determined reasonable amount above $25,000,000. E.g., $500,000 estate = $13,000 each for attorney and PR.); Idaho uses a reasonable-fee model (UPC state: reasonable compensation (Idaho Code §15-3-719); no percentage schedule.). Filing fees — California: $435 first-filed petition for letters (Gov. Code §70650, Statewide Civil Fee Schedule); a few counties add local surcharges (~$435-$500). Note each side’s petition triggers the fee. Idaho: varies by county

Full detail: probate cost by state and small-estate limits by state.

Probate cost in each state, specifically

California uses a statutory percentage schedule, so the fee is computable exactly, and its small-estate route can reach real property under a statutory cap. Idaho uses a “reasonable fee” standard with no schedule, and its small-estate route does not clear a solely owned house. The two states differ on that question, which is exactly the kind of thing a move changes. Full figures with the governing statute, the court filing fee and the small-estate threshold: California probate cost and Idaho probate cost.

Four taxes, two states, one order of operations

Everything above changes together: what California stops taking on withdrawals, what Idaho does not take at death, and what probate costs in each. The order you do things in — when you establish domicile, when you convert, when you retitle property — changes the total, and some of it cannot be undone afterwards. If a move is genuinely on the table, here is what to look for in an advisor who knows both California and Idaho. If you would rather price it yourself first, the two-state comparison tool is free and asks for no email.

Will California still tax me after I move to Idaho?

Not on your retirement withdrawals, once you genuinely change domicile — but that is a harder test than a change of address, and what you leave behind stays in reach.

• Domicile is a test, not a mailing address. A departing state can and does audit residency. Days present, voter registration, driver’s licence, where your doctors and advisers are, and where you keep what you value all count.
• A Roth conversion is taxed where you live in the year you convert. Sequencing a conversion after establishing the new domicile is often worth more than the annual saving — see how all 51 jurisdictions tax Roth conversions.

Full state detail

Every figure above is summarized. The complete statute-cited breakdown for each state: California retirement taxes and Idaho retirement taxes. To compare any other pair, start at the retirement tax relocation hub.

Widen the comparison

This page prices one corridor. To see every destination California retirees consider and every origin state moving to Idaho, start there instead. For any pair not covered, the retirement tax comparison tool runs all 51 jurisdictions, and the probate cost calculator works out what settling the estate costs in each.

Talking this through

Relocation timing, Roth conversion sequencing and estate exposure interact, and the order you do them in changes the total. If you want a second opinion, understand what it should cost first — see our advisor cost guide.

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Primary sources

• FTB 2025 Schedule CA (540) instructions
• Cal. Rev. & Tax. Code (2025-26 budget trailer legislation)
• Idaho Code § 63-3022A
• Idaho State Tax Commission: Idaho Retirement Benefits Deduction
• Form 39R Part B
• Cal. Prob. Code §10810
• Cal. Prob. Code §10800
• Cal. Prob. Code §§13100-13101
• Cal. Gov. Code §70650
• Idaho Code §15-3-719
• Idaho Code §15-3-1201

Methodology: every figure is quoted from Clear Money Guide’s statute-cited 51-jurisdiction datasets, compiled from state statutes, session laws and revenue-department publications and adversarially verified in July 2026. Nothing here is personalized tax or legal advice. Confirm your own facts with a qualified adviser before you move.