California and Your Retirement Withdrawals After Leaving: The Federal Law That Stops Source-State Pension Tax

The fear is reasonable — California is aggressive about residency and its Franchise Tax Board audits departures — but on retirement income specifically, Congress settled the question decades ago. The statute: Title 4 of the United States Code, section 114, provides that no state may impose an income tax on any retirement income of an individual who is not a resident or domiciliary of that state, as determined under the state's own laws. Retirement income for this purpose includes distributions from qualified plans (401(k), 403(b), and pension plans), IRAs (traditional and Roth), deferred compensation plans of governmental and tax-exempt employers, and certain nonqualified deferred compensation paid in substantially equal periodic payments over the recipient's life or a period of at least ten years — the federal definition, which the states cannot narrow. The consequence for the retiree who moves from California to Canada: once the retiree is not a California resident or domiciliary under California law, California cannot tax their 401(k), IRA, or pension distributions, even though every dollar was contributed and grew while they lived and worked in California; the same protection applies against every state, so the retiree leaving New York, New Jersey, or any other high-tax state carries it too. What the statute does not cover, and where California's reach survives: it is a residency rule, not a source rule — the retiree who remains a California resident or domiciliary under California's tests (the person who kept the California home, the driver's license, the professional registration, the family, and the intention to return) is taxed by California on all income, retirement income included, wherever they physically are; the retiree who has genuinely moved to Canada must have actually broken California residency under California's own standards (the state-residency guide covers the break — the closest-connections analysis, the presence tests, and the documentation), because the federal statute protects nonresidents as determined by state law, and a departure that California can characterize as temporary or transitory leaves the retiree a California resident with no protection. Beyond residency, California-source income that is not retirement income remains taxable to the nonresident: California rental income, income from a California business or partnership, gains on the sale of California real property, and — relevant to retirees — nonqualified deferred compensation that does not meet the statute's periodic-payment definition (a lump-sum nonqualified payout, or payments over fewer than ten years, is not protected and is sourced to where the services were performed), stock option and restricted stock income attributable to California workdays (sourced to California by the workday allocation regardless of when exercised or vested), and accrued vacation or severance paid after departure for California services. The Roth wrinkle: Roth IRA qualified distributions are excluded from income everywhere anyway; the statute's relevance to Roths is that conversions and non-qualified distributions after the move are protected from California as retirement income of a nonresident — a retiree who converts a traditional IRA to a Roth after breaking California residency owes no California tax on the conversion (the Roth-conversion guide covers why the conversion should still precede the Canadian residency date, which is a separate deadline from the California break). The mechanics after the move: the retiree's plan administrators should have the Canadian address and a W-8BEN (for a non-citizen) or updated withholding elections (for a citizen) on file, and no California withholding should apply to distributions to a nonresident; a final California part-year return is filed for the departure year (California income through the departure date, including any California-source items after it); and no California return is required in later years unless California-source non-retirement income exists — with the retiree keeping the residency-break documentation for the Franchise Tax Board's occasional inquiry, which arrives most often when a former resident continues to have California connections the state can see (a property, a business interest, a professional license). The Canadian side is indifferent to the statute: Canada taxes the Canadian resident's retirement income on its own rules with a credit for federal US tax — the statute simply removes a state layer that would otherwise have been a partly-uncreditable cost (Canada's foreign tax credit covers US federal tax on the income; state tax is creditable in principle but the computation is less clean). The advisory point that follows: for a California retiree contemplating Canada, the federal statute makes the state layer disappear on retirement income the moment the residency break is genuine — which converts the California question from a tax question into a residency-documentation question, and puts the effort where it belongs, on the break.

Key takeaways

• The federal statute: no state may tax the retirement income of a nonresident — qualified plans, IRAs, governmental and tax-exempt deferred compensation, and life-or-ten-year periodic nonqualified payments are protected once you are not a resident or domiciliary under the state's own law.
• It's a residency rule, not a source rule: where the money was earned is irrelevant; whether California still considers you a resident is everything — the break must be genuine under California's closest-connections and presence tests.
• What California can still tax a nonresident on: California-source non-retirement income — rentals, business and partnership income, real property gains, lump-sum or short-period nonqualified deferred compensation, and equity compensation sourced to California workdays.
• Roth conversions after the break are protected as nonresident retirement income — but the Canadian residency date is a separate and earlier deadline for conversions.
• Mechanics: Canadian address and withholding forms with plan administrators, a part-year California return for the departure year, no later California returns absent California-source income, and the residency-break file kept for the Franchise Tax Board's inquiries.
• Canada doesn't care: it taxes the resident's retirement income with a credit for US federal tax; the statute simply removes a state layer that would have been an awkward extra cost.

The California departure file for a retiree

The break: California home sold or converted (and the closest-connections factors moved — license, registrations, professional memberships, bank relationships, family, the stated intention); the departure date documented; presence in California after departure minimal and logged. The plans: administrators notified of the Canadian address; withholding elections or W-8BEN updated; California withholding confirmed at zero on distributions after departure. The returns: the part-year California return for the departure year with any California-source items after departure identified; a memo of why no later California returns are required. The residual: any California-source non-retirement income listed with its annual California filing requirement. One folder, assembled once, answering the Franchise Tax Board's letter before it's written.

Worked example

A retired Silicon Valley engineer moves to Victoria with a US$1.4 million 401(k), a US$600,000 IRA, a US$250,000 nonqualified deferred compensation balance from his former employer, and unexercised stock options with California-workday history. The break: the Los Altos home sold, the California license surrendered for a BC one, memberships moved, family with him, and a documented intention to stay — genuine California non-residency from the departure date. The 401(k) and IRA: protected by the federal statute from any California tax on distributions, forever, regardless of their California origin — his withdrawals are taxed by the US federally (as a citizen, at graduated rates) and by BC (with a credit), and California gets nothing. The nonqualified deferred compensation: his plan pays it over five years — fewer than the statute's ten — so it is not protected retirement income; California sources it to the California services that earned it and taxes the nonresident on each payment, a five-year California filing obligation his departure file records (the alternative election available under his plan, payments over fifteen years, would have brought it inside the statute — a decision worth revisiting with the plan administrator before the first payment). The stock options: exercised after the move, the income attributable to California workdays is California-source and taxable there under the workday allocation — another line in the departure file. His part-year California return for the departure year is filed; the Franchise Tax Board's residency questionnaire arrives eighteen months later (triggered by the option exercise's California-source reporting), and the departure file answers it in one exchange. Total California tax on the US$2 million of retirement accounts over his retirement: zero, by federal statute. Total California tax on the nonqualified plan and the options: real, and known in advance, which is the file's other job.

Official sources

The California Franchise Tax Board explains that residency for California tax purposes depends on where an individual is domiciled and present for other than a temporary or transitory purpose, that nonresidents are taxed only on California-source income, and that federal law prohibits states from taxing the qualified retirement income of nonresidents. — California Franchise Tax Board, Residency status, https://www.ftb.ca.gov/file/personal/residency-status/index.html

"A 401(k) is a feature of a qualified profit-sharing plan that allows employees to contribute a portion of their wages to individual accounts." Elective salary deferrals "are excluded from the employee's taxable income" until distributed. — Internal Revenue Service, 401(k) Plans, https://www.irs.gov/retirement-plans/401k-plans

Practitioner note

The California pension fear is the corridor's most durable myth, and the federal statute kills it cleanly for qualified plans and IRAs — once the residency break is genuine under California's own tests, which is where the actual work lives. Our California departure file does the break properly and then separates the protected retirement income from the California-source items that survive the move (short-period nonqualified payouts, workday-sourced equity), because the retiree who assumes everything is protected and the one who assumes nothing is are both wrong in expensive ways.

See also: For the retire-in-Canada-or-the-US comparison, account by account, see the retire-in-Canada-or-the-US comparison, account by account; and browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the California departure engagement — the residency-break documentation against California's closest-connections tests, plan-administrator address and withholding updates, the departure-year part-year return, and the inventory of California-source non-retirement income with its ongoing filing obligations. See cross-border pricing or book a call.