Moving from Toronto to San Diego: Taxes, RRSP, and Biotech Pay

Toronto to San Diego isn’t a Bay Street pipeline. It’s a science and defense one: Illumina, Scripps Research, the Salk Institute, and UC San Diego pull Toronto’s pharma and genomics talent into the Torrey Pines biotech cluster, while General Atomics, Northrop Grumman, and the Navy’s presence at Naval Base San Diego and Camp Pendleton draw engineers from Toronto’s defense contractors. Ontario’s combined top rate runs around 53.53%. California’s lands closer to 50 to 51% once the federal rate is layered on top of the state’s 13.3%. That gap is real but modest, nothing like the corridors into Texas or Florida. The move gets made for the work and the climate, not the tax bill, and the one number that actually changes behavior is what California does to an RRSP every year.

How close are Ontario and California’s top tax rates?

Closer than Texas or Florida, but not identical. Ontario’s brackets top out at 13.16%, then a surtax adds 20% of basic provincial tax above roughly $4,991 and another 36% above roughly $6,387, pushing the effective top rate near 20.5% and the combined federal-provincial rate to about 53.53%. California’s brackets run to 12.3%, plus a 1% Mental Health Services Tax above $1 million, for a 13.3% top state rate and a combined federal-state rate around 50 to 51%.

	Toronto / Ontario	San Diego / California
Top bracket before surtax/surcharge	13.16%	12.3%
Surtax/surcharge on top	20% + 36% surtax on basic tax	1% flat above $1,000,000
Combined with federal top rate	About 53.53%	About 50 to 51%
Sales tax	13% HST	About 7.75% combined state, county, and city
Estate tax	None federally, but probate and deemed disposition apply	None; California has no state estate tax

What happens on departure from Ontario?

Two authorities look at the same exit, but only one return gets filed. Ceasing Ontario residence triggers Canada’s federal departure tax at Ontario’s surtax-loaded rates, reported on a single T1 with the T1161 and T1243 attached; there’s no separate provincial departure filing. Most property is deemed sold at fair market value on your last day of residence, and half of the gain becomes taxable, at Ontario’s rates, before a US return is even in the picture. The departure tax guide covers the forms in full.

Does California really tax my RRSP every year?

Yes, and this is the trap that costs more than the rate gap above. The tax treaty lets the RRSP defer US federal tax on plan earnings until withdrawal, automatic, no election needed. California’s Franchise Tax Board doesn’t follow that deferral at the state level: it treats the RRSP as a foreign grantor trust and taxes the interest, dividends, and realized gains inside the plan every year on Schedule CA, whether or not you ever touch the money.

• There’s no California foreign tax credit for the eventual Canadian withholding on this same growth, so the two countries don’t reconcile against each other. Get a full year of RRSP statements before setting a departure date, and decide whether collapsing or restructuring the plan before California residency starts beats years of annual Schedule CA reporting.

Who’s actually hiring in the San Diego corridor?

Mostly life sciences, defense, and research, a different mix than Toronto’s finance and general tech base. Illumina anchors the genomics side, alongside Scripps Research, the Salk Institute, and UC San Diego’s research and health system. Qualcomm covers wireless and semiconductor work. General Atomics, Northrop Grumman, and BAE Systems, together with the Navy’s footprint at Naval Base San Diego and Camp Pendleton, cover defense and unmanned systems. Bay Street finance isn’t a natural fit here; that talent tends to land in Los Angeles or San Francisco instead.

• If your Toronto experience is in pharma, genomics, research administration, or defense engineering, this corridor lines up with the work itself, not just the visa or the weather.

What does Prop 13 mean against Ontario’s property tax?

A capped-growth system replacing an uncapped one, and the cap doesn’t mean a lower bill. Ontario reassesses at current value every year, so a rising Toronto assessment pulls the tax bill up with it. California’s Proposition 13 caps assessed value growth at 2% a year and holds the nominal rate to roughly 1.0% to 1.25% of that capped base. The catch is the reset at purchase: San Diego County home prices are steep enough that the fresh market-value assessment on a new purchase often produces a higher first-year bill than a comparable Toronto property, even against Ontario’s 0.6% to 1.0% typical rate over time.

• Toronto’s land transfer tax, doubled by the municipal add-on for a Toronto property, disappears once you’re not buying in Ontario, worth pricing back in only if a return purchase is realistic.

Does San Diego tax my paycheck on top of California?

No. San Diego has no city income tax on a W-2 paycheck; California’s state rate is the only income tax layer on employment income. What does move locally is sales tax, which combines state, county, and city components to about 7.75% in San Diego, against 13% HST in Toronto. Property tax and housing cost carry more weight in this corridor’s budget than any local income tax ever would, since there isn’t one.

What happens to OHIP and the Ontario Health Premium?

Both wind down, on separate schedules. OHIP coverage continues for up to three months after Ontario residence ends, then stops, leaving a gap to cover with an employer plan or a marketplace policy before US coverage starts. The Ontario Health Premium, up to $900 a year, stops accruing the year after departure, though a partial departure year can still carry a prorated amount. California has no equivalent premium. The provincial health insurance guide covers the timing.

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

Before, in most cases, to keep the sale under resident rules rather than non-resident ones. Selling while still an Ontario resident keeps the principal residence exemption intact and avoids the section 116 clearance certificate process that applies to a non-resident vendor. Selling after residence ends still keeps Canadian real property outside the deemed disposition, since real property is carved out of that rule, but the exemption fraction shrinks and the certificate process adds time to closing.

What should I do before the move?

Pull a full year of RRSP statements before setting a departure date, since the California addback calculation and any restructuring decision both run on that record. Decide the departure date on the actual facts of your Ontario ties; it fixes the surtax exposure on your final T1 and starts the OHIP and Ontario Health Premium clocks. Price the Toronto property sale against keeping it, factoring in the section 116 process if you wait, and line up US health coverage before the OHIP window closes.

• Canada’s departure tax, T1161 and T1243
• Leaving Canada permanently: tax checklist
• RRSP and TFSA after moving to the US
• The US-Canada tax treaty explained
• Your first US tax return as a new Canadian immigrant
• Provincial health insurance when leaving Canada
• Toronto to San Francisco, the sibling California tech corridor
• Toronto to Los Angeles, the entertainment and tech corridor
• Toronto to Phoenix, the nearby low-tax alternative
• Toronto to Austin, the zero-state-tax tech corridor
• Toronto to Seattle, the no-income-tax tech corridor
• Toronto to Boston, the biotech sibling corridor
• Montreal to San Diego, the aerospace and biotech corridor from Quebec
• Vancouver to San Diego, the tech and biotech corridor from BC
• Calgary to San Diego, the energy-to-defense corridor from Alberta
• Ottawa to San Diego, the defense corridor from Ontario’s capital

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