Moving from Quebec to Washington State: Taxes, the TP-1, and the Capital Gains Excise

Quebec carries the highest combined tax rate of any province, a top marginal rate near 53.31% once the 25.75% provincial bracket stacks on federal tax. Washington charges no personal income tax at all. That gap is one of the largest in this entire corridor set, second only to the Quebec-to-Texas move. But Quebec is also the one departure that runs through three separate tax authorities instead of two, and Washington isn’t a blank slate on the other end either: a 7% excise tax on large long-term capital gains applies above an indexed threshold, and it catches exactly the kind of concentrated stock sale a Montreal tech or aerospace employee tends to have.

Why does Quebec’s rate drop so much here?

Quebec’s own bracket structure tops out at 25.75% provincially, and stacked on the federal top bracket that produces a combined rate near 53.31%, the highest of any province. Washington has no personal income tax bracket, no surtax, and nothing resembling Quebec’s structure. Wages, bonuses, and vested equity that would be taxed at Quebec’s top combined rate are simply untaxed at the state level once Washington residency starts.

• What survives on the Washington side is narrower: the capital gains excise tax, a B&O gross-receipts tax for anyone self-employed, and a state estate tax with a lower threshold than the federal exemption.

	Quebec	Washington
Income tax (province/state)	Up to 25.75% provincial	None
Combined with federal top rate	About 53.31%	About 37% (federal only)
Capital gains treatment	50% inclusion, taxed at ordinary rates	7% excise tax on long-term gains above about $262,000; wages, retirement, and real estate excluded
Sales tax	QST 9.975% + GST 5%, about 15% combined	About 10.25% combined state and local in Seattle
Property tax (typical effective rate)	Below 1% of assessed value in most Quebec municipalities	Roughly 0.9% to 1.1% in King County
Business tax	Quebec corporate tax plus federal	No corporate income tax; a B&O tax on gross receipts instead

Do I really deal with three tax authorities?

Yes, and this is the piece unique to a Quebec departure. Every other province has its tax calculated directly on the T1, administered by the CRA. Quebec runs its own agency: it issues Relevé slips instead of T4 and T5, assesses independently of the CRA, and requires a final TP-1 reporting worldwide income to the departure date and Quebec-source income for the rest of the year. Layer a US federal return on top of that, and the departure year runs through Revenu Québec, the CRA, and the IRS at once, on three different clocks.

• The federal mechanics, including the T1161 and T1243 forms, are in the departure tax forms guide; the full sequence sits in the leaving-Canada checklist.
• A clean CRA assessment doesn’t mean the TP-1 side is closed. Revenu Québec assesses on its own timeline, using Relevé 1 (employment) and Relevé 3 (investment income), separate from the federal T4 and T5.

What happens to the departure tax at Quebec’s rate?

Quebec’s departure tax is the heaviest provincial exit in the country. The deemed disposition under ITA 128.1(4), a sale of most capital property at fair market value on the date Canadian residency ends, applies for both federal and Quebec purposes, and the resulting gain lands on both the final T1 and the final TP-1, taxed at Quebec’s own top bracket. Washington has no state return to offset against, since none exists, so the exit tax is entirely a Canadian-side event that the eventual foreign tax credit on the US return has to absorb in full.

• The Quebec abatement, a 16.5% reduction to federal tax that offsets Quebec collecting its own, gets prorated in a departure year rather than dropped outright.

Does Washington’s excise tax catch a stock sale?

Yes, and this is the number Quebec movers underweight because “no income tax” reads as the whole story. The tax is an excise on long-term capital gains (assets held over a year) above an indexed threshold, currently around $262,000, upheld by the Washington Supreme Court in March 2023. Wages, retirement distributions, and real estate sales are excluded outright. What isn’t excluded: selling vested equity, liquidating a non-registered Quebec brokerage account after arrival, or exiting a concentrated position built up at a Montreal employer before the move.

• Short-term gains, held under a year, aren’t reached by this tax at all.
• Spreading a large sale across two tax years rather than one can keep each year under the threshold.

What happens to my RRSP in Washington?

This is the cleanest RRSP math among the major US destinations. The treaty defers US federal tax on RRSP growth until withdrawal, automatically, with no election required. Because Washington charges no state income tax, there’s no state-level addback to plan around, unlike a New York or California file where the state taxes the same growth the treaty defers federally. The eventual withdrawal faces US federal tax plus Canadian withholding, 15% periodic or 25% lump sum, and the foreign tax credit only has one system on the US side to absorb it against.

• A TFSA still creates the same US reporting question regardless of state: potential Form 3520/3520-A exposure and PFIC treatment on the underlying investments. Most people collapse it before the move.

What happens to RRQ and RAMQ in Washington?

The Régime de rentes du Québec, Quebec’s version of CPP, keeps paying on the same schedule once you qualify, taxed under the treaty rather than under Quebec or federal Canadian rules once you’re a US resident, the same mechanics covered for CPP and OAS generally. RAMQ is different: reciprocal coverage can carry a tail of roughly three months after residency ends, but that tail isn’t automatic. You have to notify RAMQ of a permanent departure directly, and the provincial health insurance guide covers what to line up before that window closes.

Does sales tax actually go down here?

For this corridor, yes, which sets it apart from a BC or Alberta move into Washington. QST at 9.975% stacks with the 5% GST to a combined rate near 15%. Seattle-area sales tax runs closer to 10.25% combined state and local, an actual decrease. That’s not the pattern for every province landing in Washington; a departing BC or Alberta resident, closer to 5% GST alone, sees the number go up. Quebec is the one starting point in Canada where Washington’s sales tax reads as relief rather than a surprise.

What should I do before I file?

Start with the departure date, since it fixes the TP-1, the T1, and the deemed disposition together, all keyed to the same day. Confirm which slips you’re waiting on from Quebec employers or payers, Relevé rather than T4, and get the CRA and Revenu Québec filings moving on the same timeline rather than treating the TP-1 as an afterthought. Notify RAMQ directly rather than assuming coverage lapses on its own. Then separately plan the timing of any Washington-side stock sale, since that’s the decision that determines whether the capital gains excise applies at all.

• The general Quebec-to-US corridor
• Moving from Quebec to Texas, the largest rate drop in the matrix
• Moving from Quebec to Florida, another no-income-tax destination
• Moving from Quebec to New York, the high-tax-to-high-tax comparison
• Moving from Quebec to California, the double-high-tax comparison
• The generic Canada-to-Washington corridor
• Moving from Ontario to Washington State, the larger volume version of this same tech corridor
• Canada’s departure tax, T1161 and T1243
• Leaving Canada permanently: the checklist
• RRSP and TFSA after moving to the US
• The US-Canada tax treaty explained
• Your first US tax return as a Canadian immigrant
• Provincial health insurance rules on leaving Canada
• State income tax for cross-border filers
• How CPP and OAS are taxed once you live in the US

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