File NR73 with a clean, unambiguous fact pattern, and you can walk away with a tidy confirmation letter. File it with any ambiguity at all, and the response can open with the CRA asserting you never actually left — a position that then sits on file as evidence against you.
Same form. Same good intentions. Wildly different outcomes. The form is NR73, and almost nobody explains the asymmetry baked into it before someone signs and mails it.
The short answer
Form NR73, "Determination of Residency Status (Leaving Canada)," is entirely voluntary — there is no legal requirement to file it, and you or your advisor can simply self-assess your residency status instead. The trap is that the CRA's response is only an opinion: the CRA's own guidance states it "is not binding on the CRA and may be subject to a more detailed review at a later date." So you hand over a granular, signed snapshot of every residential tie you have — dwelling, spouse, dependants, bank accounts, health coverage, driver's licence, intentions to return — and if the CRA's opinion comes back unfavourable, or if a future auditor finds it inconsistent with how you actually behaved, that file works against you while it obligates the CRA to nothing. Most departing Canadians never file it, and for the majority of situations, they shouldn't.
What Form NR73 actually asks you to do
The form itself reads like a residency audit questionnaire, because that's essentially what it is. It asks for the address and status of every dwelling you own or lease in Canada, whether your spouse or common-law partner and dependants are staying or going, what happens to your personal property, your bank and investment accounts, your professional and social memberships, your provincial health coverage, your driver's licence, and — pointedly — your intentions about returning.
None of that is a request the CRA is entitled to make you answer. There's no statutory obligation to file NR73. You determine your own residency status the same way you determine anything else on your tax return: based on the facts, applying the law, ideally with professional help. The CRA receives a relatively small number of these requests each year — a fraction of the much larger number of Canadians who change residency status annually. Filing it is a choice a small minority make — not a step in the process.
Why an "opinion" isn't as safe as it sounds
Here's the part that gets lost in translation. People file NR73 because they want certainty before they go. What they get is a non-binding administrative opinion, based entirely on the facts they themselves supplied, that the CRA can revisit "at a later date" if it wants supporting documentation or simply changes its mind on review. Income Tax Folio S5-F1-C1 — the CRA's own residency guidance — frames the NR73 opinion this way explicitly. It's advice with none of the protection a ruling would carry, wrapped in the paperwork of a formal request.
Now flip it around. If the opinion says you're still a factual resident, that letter sits on file as an adverse position you now have to affirmatively displace — on your own return, in any future dispute, in front of an auditor who reads it before anything else. If the opinion says you're non-resident, it protects you from nothing: the CRA can still open a file later, ask for the underlying documentation the form promised, and reach a different conclusion once it looks closer. Real downside risk, for an answer with no legal weight when it goes your way.
Then there's the audit-trail problem, which I think matters most and gets discussed least. NR73 asks you to declare, under your signature, exactly what your ties were on a specific date — intentions to return included. If your actual behaviour drifts from what you declared (you come back more than planned, you never quite sell the house, your spouse stays longer than the form said), that mismatch is now documented, in your own hand, for any auditor who pulls the file. Canada's normal reassessment window is three years from your Notice of Assessment — but under ITA s. 152(4), there is no time limit at all if the CRA can show a misrepresentation attributable to neglect, carelessness, or wilful default. That's a low bar, and it covers innocent mistakes. An NR73 that no longer matches the facts is exactly the kind of material that can reopen a year you thought was closed.
I've seen this play out before: someone files preemptively "to be safe," the opinion comes back adverse or ambiguous, and unwinding that position later takes far more time, cost, and advisor involvement than simply never filing would have required.
How the CRA actually decides you've left — without a form
Here's what most people filing NR73 don't realize: the law governing residency doesn't change one bit whether you file the form or not. Residency is a question of fact, set out in Income Tax Folio S5-F1-C1, built around your significant residential ties — a dwelling in Canada, a spouse or common-law partner in Canada, dependants in Canada — weighed alongside secondary ties: personal property, social memberships, a Canadian employer, bank accounts, RRSPs, provincial health coverage, a driver's licence, a Canadian-registered vehicle.
Two statutory backstops matter regardless of any form. First, the sojourner rule: under paragraph 250(1)(a) of the Income Tax Act, someone with no factual residential ties who is nonetheless physically present in Canada 183 days or more in a calendar year is deemed resident for the entire year. Second, the treaty override: under subsection 250(5), someone who would otherwise be resident in Canada is deemed non-resident if a tax treaty's tie-breaker rules — typically permanent home, then centre of vital interests, then habitual abode, then nationality — assign residency elsewhere. Take the Canada–Barbados treaty as a working example: a Canadian who genuinely relocates to Barbados and centres their real economic and personal life there can be treaty non-resident of Canada even in a year where the domestic facts are murkier — the tie-break can override the sojourner rule entirely.
There's also the departure-date rule almost nobody quotes correctly: the CRA generally treats you as non-resident from the latest of three dates — the day you leave Canada, the day your spouse or dependants leave, and the day you become resident of your new country. NR73 doesn't change any of that math. It just gives the CRA an earlier, signed look at your facts than they'd otherwise get.
Case law backs up how fact-driven this determination really is, and how it can cut either direction regardless of anyone's paperwork. In the landmark Thomson v. MNR (Supreme Court of Canada, 1946), a taxpayer who considered himself to have left Canada was found still resident because he kept a home he used often. More recently, taxpayers in Shih v. The Queen (2000 DTC 2072, Tax Court of Canada) and Mahmood v. The Queen (2009 TCC 89) were found non-resident despite a spouse, family, or property remaining in Canada — the opposite direction, on comparably imperfect fact patterns. The CRA's own residency checklist, the one NR73 mirrors, is not the last word in any of these cases. The facts are.
What's actually riding on the answer
The reason this matters is what residency status controls. Cease to be a Canadian tax resident and ITA s. 128.1(4) deems a disposition at fair market value of most capital property you own — the so-called departure tax — with the gain taxed at the standard 50% inclusion rate on your final return. I walked through my own departure tax bill in detail elsewhere; the mechanics are the same whether or not you ever touched NR73. Form T1161 (the property list) is mandatory once total property value exceeds $25,000, with a late-filing penalty of $25 a day, minimum $100, maximum $2,500 — due even if no tax is owing. Form T1244 defers the actual payment, interest-free, under ITA s. 220(4.5), with security only required once the federal tax attributable exceeds $16,500.
Get the residency call wrong in the CRA's favour — they later argue you never actually left — and none of that applies. Instead it's worldwide income taxed for every disputed year, benefit clawbacks if you kept collecting the GST/HST credit or Canada Child Benefit post-departure, and TFSA contributions made while "non-resident" attracting a 1%-a-month penalty tax retroactively. Get it wrong the other way and Canadian-source income you assumed carried the flat 25% Part XIII withholding gets reassessed as fully taxable resident income instead. Either error is expensive. NR73 doesn't protect you from either one; it just changes who holds the paper trail when the argument happens.
Worth keeping in view: the capital-gains inclusion rate that would have applied to a chunk of departure-tax gains — a proposed increase from 50% to 66.67% above $250,000 — was deferred and then formally cancelled in March 2025. The rate on your final return today is the same 50% it's been for years, a fact-on-the-ground detail an NR73 filed years ahead of your actual departure can't anticipate.
When NR73 is actually the right call
I don't want to overstate the case against this form — it exists for a reason, and there are situations where filing it is genuinely sensible. If your fact pattern is close and you want the CRA's read before you make irreversible decisions, that has value. And practically speaking, some banks, pension administrators, and foreign tax authorities will demand official documentation of non-resident status that only a CRA opinion letter satisfies — in those cases, NR73 isn't optional in practice even though it's optional on paper. If a foreign bank won't open an account without it, or a Canadian pension administrator insists on it before adjusting withholding, that's a legitimate reason to file, and I've told clients to do exactly that.
What I push back on is filing NR73 reflexively, as a box-checking exercise "just to be safe," when the facts are clean and nobody outside your own head is asking for the CRA's opinion. That's where people create risk while believing they're eliminating it.
What I recommend instead
For the majority of departures, the better path is the boring one: report your departure date correctly on your final T1 return as an emigrant, file T1161 and T1243 (and T1244 if you're deferring), stop claiming resident-only credits and benefits, and — this is the part people skip — keep contemporaneous evidence of what you actually did. Sale or lease of your home. Closed accounts. Cancelled health coverage and driver's licence. New-country residency documentation. Dated, filed, boring, and entirely under your control.
That approach puts the onus where it belongs: on the CRA, to challenge your position within the normal reassessment period, using evidence of what genuinely happened rather than a form you filled out before you'd actually lived the answer. The CRA's own emigrants guidance frames NR73 as something you can request if you want their opinion — not something the process requires. Establishing genuine tax residency somewhere else, whether that's St. Kitts & Nevis, Antigua and Barbuda, or a territorial-tax jurisdiction that doesn't reach foreign income at all, is what actually settles the question — not a signed opinion request mailed to Ottawa before you've lived a day of the new life.
This is exactly the conversation I have most often with clients leaning toward filing NR73 "to be thorough": building the documented paper trail instead, so the record that exists is proof of what you actually did — not a prediction of what you intended to do.
If your departure is approaching and the facts are anything but clean-cut, that file belongs in front of an advisor before you touch any CRA form — not after an opinion is already sitting on record. This is the kind of fact pattern that benefits from an advisor's eyes before anything gets filed with the CRA — get in touch if that's where you are.
Key takeaways
- Form NR73 is entirely voluntary. There's no legal requirement to file it, and residency can be self-assessed based on the facts.
- The CRA's response is a non-binding opinion — its own guidance says so — while the granular ties you disclose on the form become a signed record that can be used against you later.
- Residency is determined by Income Tax Folio S5-F1-C1's primary and secondary ties, the 183-day sojourner rule, and treaty tie-breaker rules — none of which change based on whether you filed NR73.
- Under ITA s. 152(4), the CRA can reassess with no time limit at all if it finds a misrepresentation attributable to neglect or carelessness — an NR73 that no longer matches your actual facts is exactly the kind of evidence that can reopen a closed year.
- The safer default for most departures is documenting your actual departure properly — final return, T1161, T1243, contemporaneous evidence of severed ties — and reserving NR73 for genuine borderline cases or third-party demands for official documentation.
Frequently asked questions
Do I have to file Form NR73 when I leave Canada? No. Filing NR73 is completely voluntary. You and your tax advisor can self-assess your residency status based on the facts, and most people who leave Canada each year never file it.
Is the CRA's NR73 determination legally binding? No. The CRA's own guidance states its response to an NR73 request is not binding on the CRA and may be subject to a more detailed review later. It's an administrative opinion, not a ruling, based entirely on the facts you supply.
Can the CRA reassess my residency status years after I've left? Yes, in certain circumstances. The normal reassessment window is three years from your Notice of Assessment, but under ITA s. 152(4) there is no time limit if the CRA finds a misrepresentation attributable to neglect, carelessness, or wilful default — a standard that can capture honest mistakes, not just deliberate ones.
When does it actually make sense to file NR73? When your residency facts are genuinely borderline and you want the CRA's read before making irreversible decisions, or when a bank, pension administrator, or foreign tax authority specifically demands official CRA documentation of your non-resident status. Outside those situations, filing it as a precaution usually creates more exposure than it resolves.
What should I do instead of filing NR73? Report your correct departure date on your final T1 emigrant return, file Form T1161 (and T1243/T1244 if applicable), stop claiming resident-only credits, and keep contemporaneous records proving your ties were actually severed — a sold or leased home, closed accounts, cancelled health coverage, and evidence of new-country residency.
