Moving from Ontario to California: Taxes, RRSP, and OHIP

Ontario and California are two of the highest-tax jurisdictions on either side of the border, and their combined top marginal rates land close enough to surprise people who assumed California would be the expensive one. Ontario’s combined federal-plus-provincial top rate runs around 53.53%. California’s combined federal-plus-state top rate runs around 50.3%. The gap that actually matters for an Ontario mover isn’t the top bracket, it’s how each system gets there, and what happens to an RRSP, OHIP, and the Ontario-specific charges that vanish the day you leave.

Why does Ontario’s rate look so close to California’s?

Because both systems pile a second layer on top of a graduated base, they just build it differently. Ontario’s five brackets top out at 13.16%, and then the surtax adds 20% of basic Ontario tax above roughly $4,991 and a further 36% above roughly $6,387 of basic tax, which is why an Ontario taxpayer’s effective top provincial rate runs closer to 20.5% than the 13.16% bracket number suggests. California skips the surtax mechanic and gets to a similar place with rate brackets alone, running from 1% up to 12.3%, plus a flat 1% Mental Health Services Tax on income above $1 million, for a 13.3% state top rate.

	Ontario	California
Top bracket (provincial/state only)	13.16%, before surtax	12.3%, before surcharge
Surtax/surcharge on top	20% + 36% surtax on basic tax above two thresholds	1% flat above $1,000,000
Effective top provincial/state rate	About 20.5%	13.3%
Combined with federal top rate	About 53.53%	About 50.3%
Capital gains treatment	50% inclusion, taxed at ordinary rates	No preferential rate; full gain at ordinary rates

Read the last row carefully. Ontario’s 50% inclusion looks like relief next to California’s flat ordinary-rate treatment, but California’s federal capital gains rate is also lower than Canada’s combined ordinary rate on the included half, so the two systems land closer than either number alone suggests. The capital gains comparison guide works through that arithmetic in full.

What happens to the deemed disposition on departure?

Ceasing Ontario residence triggers Canada’s departure tax first, and Ontario takes its full share before you ever file a US return. Ceasing Canadian residence deems most property sold at fair market value, and half of any resulting gain is a taxable capital gain on your final T1. Because the province test for an emigrant is keyed to the last day you actually resided in Canada rather than December 31, the whole departure-year gain typically lands in Ontario, at Ontario’s rates, including whatever surtax that gain’s basic tax pushes you into.

• There’s no California credit waiting on the other side for that Ontario tax; the two systems don’t talk to each other, they just both charge.
• The departure tax pillar covers what the deemed sale reaches and what’s excluded, and the T1161/T1243 guide covers the forms and the math.

Does California really tax my RRSP every year?

Yes, and this is the trap that costs Ontario movers more than the rate table above. The treaty defers US federal tax on RRSP earnings until withdrawal, and for an eligible individual that deferral applies automatically, no election needed. California’s Franchise Tax Board takes the opposite position at the state level: the treaty deferral “does not apply for California income tax purposes,” and a California resident reports the plan’s interest, dividends, and realized gains as they accrue, every year, on Schedule CA. Nothing about this shows up on your 1040, so nothing on the federal side warns you it’s coming.

• California also allows no foreign tax credit, so there’s no mechanism to offset the eventual Canadian withholding against the California tax already paid on the same growth.
• The BC-to-California guide walks through the FTB’s own language and the Schedule CA mechanics in full, and what happens to your RRSP and TFSA covers the federal side before you compare the two.

What happens to OHIP and the Ontario Health Premium?

Both end, on different clocks. OHIP coverage continues for up to three months after you stop being an Ontario resident, then stops, which means a gap to plan for before US health coverage (an employer plan or an ACA marketplace policy) actually starts. The Ontario Health Premium, a charge of up to $900 a year built into your Ontario tax bill, disappears once your Ontario residency ends, but only from the year after your departure year forward; the premium’s liability test looks at residence on the last day of the year, so a partial departure year can still carry it.

• California has no equivalent premium and no universal coverage to replace OHIP with; health insurance in the US runs through an employer plan or a marketplace policy, and that’s a cost to budget for that Ontario never charged directly.
• The provincial health insurance guide covers the OHIP wind-down mechanics in more detail.

Ontario item	What happens when you leave	Trigger
OHIP coverage	Continues up to three months after you stop being an Ontario resident, then stops	Loss of Ontario residency
Ontario Health Premium	Stops accruing from the year after your departure year; a partial departure year can still carry it	Residence on the last day of the tax year
Ontario Trillium Benefit	Stops with the first month beginning after your Ontario residency ends	Residence at the start of each month
Ontario surtax	Applies in full to the departure year, since the deemed-disposition gain typically lands in Ontario	Province test on your last day of Canadian residence

California has no equivalent to any of the first three, and no equivalent surtax mechanic on the way in either. Its graduated brackets and the 1% surcharge are the whole story once you land.

Should I sell the Ontario home before or after I leave?

Before, if you want the sale to run under the ordinary resident rules rather than the non-resident ones. Selling while still an Ontario resident keeps the transaction inside the normal principal residence exemption calculation and avoids the section 116 clearance certificate process that applies to a non-resident vendor of Canadian real property. Selling after residence ends still leaves the home outside the departure-tax deemed disposition (Canadian real property is carved out of that), but it brings in a shrinking exemption fraction and the certificate process on top.

• Ontario’s land transfer tax, doubled in Toronto by the municipal land transfer tax, is a buyer-side cost rather than a seller-side one, but it matters to the same decision if there’s any chance you buy back into the Toronto market later: that combined provincial-plus-municipal charge hits again on re-entry, and it’s worth pricing into a decision to keep the Ontario home rather than sell.
• The sold-the-Canadian-home guide works through both sides of the math, and the section 116 certificate guide covers the non-resident-sale process.

Where do Ontario movers to California actually work?

Four corridors account for most of what Blue Cloud sees. Toronto and Waterloo send software engineers, founders, and product talent into the Bay Area, often on equity-heavy packages where the RRSP mismatch and the ordinary-rate capital gains treatment both bite. Toronto’s film and television industry, one of the largest production hubs outside Los Angeles, sends crew, producers, and post-production talent to LA on the reverse of the corridor Los Angeles productions have been using in Toronto for years. Financial services professionals move between Bay Street and California’s asset management and fintech firms.

• And Toronto’s biotech and health-sciences cluster feeds San Diego and the Bay Area on research and executive moves.

What should I do before the move?

Pull a full year of RRSP statements before you set a moving date, since the California earnings figure has to be built from those and nothing else produces it. Decide your departure date on the facts, because it fixes the Ontario surtax exposure on your final return and the OHIP and Trillium clocks that follow it. Price out selling the Ontario home before departure against keeping it, factoring in the land transfer tax you’d pay again if you ever buy back in. And line up US health coverage before OHIP’s three-month window runs out, not after.

• The generic Canada-to-California corridor
• The BC-to-California RRSP deep dive
• Leaving Canada permanently: the checklist
• Canada’s departure tax, T1161 and T1243
• Probate fees and multiple wills in Ontario
• Moving from Ontario to Florida, the no-income-tax comparison
• Moving from Toronto to New York, the state-plus-city corridor
• Foreign tax credit limitation and carryover, relevant once both systems have taxed the same gain
• State income tax for cross-border filers, the broader state-tax picture beyond California
• Toronto to Los Angeles, the city-level entertainment corridor

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.