What is the difference between deemed resident and factual resident?
Both are taxed by Canada on worldwide income, so the headline looks the same. The difference is how you arrived there and what comes with it. A factual resident is resident because their ties are here in fact. A deemed resident is resident because a statutory rule says so, whatever the ties look like. What follows is not identical. A deemed resident is not resident in any province, so the provincial element of the return works differently: tax that would otherwise be provincial is charged federally instead, and credits or benefits calculated by reference to a province do not apply on the same terms. Getting the label right therefore decides which return is even the correct one to file.
Which province do I file in as a deemed resident?
None, and that is the whole point of the distinction. Provincial tax follows residence in a province at the end of the year, and a deemed resident is resident in Canada without being resident in any province. The return is prepared on a federal basis, with the provincial element charged federally rather than by a province. That has knock-on effects people do not expect, because credits administered provincially and benefits calculated on a provincial base are not available on the same footing. It also means the province you last lived in does not change the answer. The question to settle first is not which province, but whether the statutory rule reaches you at all.
Can I claim provincial tax credits as a deemed resident?
Generally not on the same footing as someone resident in a province. Credits and benefits computed by reference to a province of residence assume there is one, and a deemed resident does not have one. Federal amounts are a separate question and are looked at on their own terms. The practical consequence is that a return prepared on the wrong assumption tends to fail in both directions at once: it claims something that is not available and misses something that is. Where a reclassification happens after filing, the credit position usually has to be recomputed for every affected year rather than the current one alone, which is why the classification is worth settling before the first return goes in.
Why does Canada treat me as resident when I live abroad?
Because residence is not only a question of ties. Alongside the fact-based test there are statutory rules that attach Canadian residence to a person by virtue of their situation rather than their connections, and they apply whether or not anything was left behind. Someone who has genuinely emigrated, sold up and settled elsewhere can still be caught. The rule operates on status and circumstance, so the usual evidence of departure — the sold house, the cancelled coverage, the foreign lease — does not answer it, however carefully it was assembled. If a notice says you are resident and you are confident your ties ended, the first thing to check is whether a deeming rule is doing the work instead of the ties.
Can a treaty stop Canada taxing me as a deemed resident?
Sometimes, and where it can, the mechanism is not a repeal of the Canadian rule but a tie-break. If the other country also treats you as resident under its own law, the treaty between the two decides which residence governs for treaty purposes, working through an ordered sequence of tests. A successful claim does not delete the Canadian classification. It limits what Canada may tax, and it usually changes the shape of the filing rather than removing it. There are also countries with no treaty at all, in which case the tie-break is unavailable and relief has to come through the credit system instead. Either way the claim is made on the return, with the facts recorded, rather than assumed.
Can I be a deemed resident and a non-resident in one year?
Each label describes a period rather than a moment, so the answer turns on whether the deeming rule applied for part of the year and what the other country did meanwhile. Where status changes mid-year, the questions are when the rule began or ceased to apply, and whether the remainder of the year is governed by the fact-based test instead. Mixed years are where most errors appear, because the return has to reflect one basis for one part and another basis for the rest, with income allocated on a defensible cut. The document trail matters more than the analysis here: the date the circumstance changed has to be provable, because every figure is derived from it.
Do I have to declare my dual citizenship?
A tax return does not generally ask you to declare which passports you hold; it asks about residence, and in the US case it applies to citizens by definition. What does ask is your bank. Account-opening self-certification under FATCA and the Common Reporting Standard asks which countries you are a tax resident or citizen of, and the answer is reported onward to the tax authority. So the practical answer is that the information arrives either way. See FATCA reporting.
Do I get credit for all of the foreign tax I paid?
Only up to your own country's tax on that same income, and only for tax you were legally obliged to pay. Two consequences follow. Living somewhere that taxes you more heavily than your residence country does leaves an excess that becomes a carryover rather than a refund. And withholding suffered above the treaty rate is not creditable — the route back to that money is a refund claim in the country that took it. See claiming the credit.