Cross-Border Retirement Accounts: RRSP, 401(k), IRA and Roth

For most people, retirement accounts are the largest financial asset they will ever own. When a person, an account, or a payment moves between Canada and the United States, those accounts stop being a simple savings vehicle and become a cross-border tax problem. A plan that grows tax-free in one country is not automatically recognized as tax-deferred in the other, withholding tax can be deducted at source the moment money is paid across the border, and a routine reporting form left unfiled can carry penalties that dwarf the tax itself. The Canada-US tax treaty was written to prevent double taxation of pensions and retirement savings, but its protections are not self-executing — they generally depend on the right election being made, in the right place, by the right deadline.

This page explains how the main accounts — the Canadian RRSP and RRIF, and the US 401(k), traditional IRA and Roth IRA — are treated on each side of the border, how the treaty links the two systems together, and the traps that most often turn a sound retirement plan into an unexpected tax bill. It is general information, not advice on your situation.

Why cross-border retirement accounts matter

The core issue is that Canada and the United States each tax their residents on worldwide income, and the US also taxes its citizens and green-card holders no matter where they live. A US citizen living in Toronto with an RRSP, or a Canadian who has moved to Florida with a 401(k), is squarely inside two tax systems at once. Each country has its own rules on when retirement income is taxed, how much is withheld at source, and what must be reported. Where those rules overlap without coordination, the same dollar can be taxed twice; where they leave a gap, an account that was supposed to be sheltered can lose its protected status entirely.

The treaty — the Convention Between Canada and the United States of America — is the mechanism that knits the two systems together. Article XVIII deals specifically with pensions and retirement arrangements, and it does two important things: it lets a resident of one country defer tax on income accruing inside a retirement plan in the other country, and it caps the rate of source-country withholding on pension payments. The catch is that several of these benefits require an affirmative election, and some can be permanently lost through a single misstep.

RRSPs and RRIFs: the mechanics in both countries

Inside Canada, an RRSP defers tax on contributions and on investment growth until money is withdrawn; a RRIF is the payout vehicle an RRSP typically converts into. For a Canadian resident, this is straightforward. The complications arise when a US person holds the plan, or when a non-resident of Canada takes money out.

For a US citizen or US resident who owns an RRSP or RRIF, the United States does not automatically respect the Canadian deferral. Without relief, the IRS could tax the year-by-year growth inside the plan even though no money has been withdrawn. Article XVIII(7) of the treaty solves this by allowing the individual to elect to defer US tax on the undistributed income earned in the plan until it is actually paid out — mirroring the Canadian treatment. For many years this election was made on Form 8891. That form was made obsolete after 31 December 2014, and under Revenue Procedure 2014-55 an eligible individual who would have qualified to make the election is now generally treated as having made it automatically, without a separate annual filing. This removed a common, painful failure point — but it did not remove the separate obligation to report the account, which is discussed below.

On the Canadian side, the key issue is withdrawals by a non-resident. When an RRSP or RRIF pays out to someone who has left Canada, Canada applies non-resident withholding tax at source. The domestic rate is generally 25%. For a US resident, the treaty steps in: under Article XVIII(2), the rate on a periodic pension payment — for example, a properly structured stream of RRIF payments — is reduced to 15%. A lump-sum withdrawal, by contrast, does not qualify for the reduced rate and remains subject to the 25% rate. What counts as a periodic payment is not defined precisely in the treaty; CRA applies administrative guidance based on the size of each payment relative to the account or the prior year's minimum, so the way withdrawals are structured can directly change the tax cost. Collapsing an RRSP in one lump sum after leaving Canada is one of the most common and most expensive mistakes we see.

401(k)s, IRAs and the move to Canada

The mirror-image questions arise when someone holding a US 401(k) or traditional IRA becomes a resident of Canada. The good news is that the treaty generally allows Canada to recognize the US plan as tax-deferred: a Canadian tax resident is entitled to deferral of the income accruing inside a 401(k) or IRA in much the same way a US resident would be, until distributions are taken. Growth inside the plan is therefore not taxed in Canada year by year merely because the owner now lives there.

The harder questions are about moving the money. There is no direct, tax-free rollover that simply shifts a US 401(k) or IRA into a Canadian RRSP the way one US plan can roll into another. Instead, Canada permits an indirect transfer under paragraph 60(j) of the Income Tax Act: the individual withdraws from the US plan, includes the amount in Canadian income, and then contributes a corresponding amount to an RRSP, claiming an offsetting deduction. This can be made to work, but the conditions are strict — the payment must qualify as a foreign pension or superannuation benefit, the RRSP contribution generally has to come from the gross distribution, and US tax withheld reduces the cash actually in hand. Because the US tax on the distribution is creditable in Canada only up to certain limits, a poorly sequenced transfer can leave the taxpayer with foreign tax that cannot be fully recovered.

The sharpest trap is age. A withdrawal from a 401(k) or IRA before age 59 1/2 can attract the 10% additional tax on early distributions under IRC section 72(t), on top of regular US income tax — and this applies even when the owner is now a Canadian resident moving the money north. CRA has accepted that this 10% additional tax can be claimed as part of the foreign tax credit when computing Canadian tax, which softens the blow, but it does not eliminate the cash-flow and timing problems. Transferring a 401(k) or IRA to Canada before that age, without planning, can be considerably more costly than waiting or using an exception such as substantially-equal periodic payments.

The Roth IRA: a benefit that is easy to forfeit

The Roth IRA deserves separate attention because its central feature — tax-free qualified distributions in the US — can be preserved in Canada only with care. Under the treaty, a Roth IRA can continue to be treated as a pension whose income is not taxed in Canada, so its tax-free character survives a move north. But this protection depends on a one-time election filed with CRA, generally by the filing deadline for the year the person first becomes a Canadian resident. There is no prescribed CRA form; the election is made by letter for each Roth account, identifying the owner and the plan.

The decisive trap is the "Canadian contribution" rule. If the owner makes any contribution to the Roth IRA after becoming a Canadian resident, the treaty protection is broken from that point forward, and the portion of the Roth attributable to the Canadian-period contribution and its growth is no longer sheltered in Canada — the account is effectively split, permanently, into a protected portion and an unprotected one. A single deposit, including an automatic or employer-linked contribution, can taint the result. Anyone moving to Canada with a Roth IRA should generally stop contributing to it before establishing Canadian residency and file the election on time. If the deadline was missed, it may still be possible to seek relief through CRA's Competent Authority, but this is far harder than getting it right the first time.

How the treaty ties it together

Across all of these accounts, the same treaty machinery is doing the work. Article XVIII governs the character of pension and retirement income, the availability of deferral, and the capped withholding rates. Article XXIV — the elimination-of-double-taxation article — is what allows each country to credit the tax the other has charged, so that a withdrawal taxed at source is not also fully taxed again on the resident return. Article IV, the residence and tie-breaker rules, determines which country is the country of residence in the first place, which is the threshold question for almost everything else. The treaty does not erase tax; it allocates the right to tax between the two countries and provides credits to relieve the overlap. Getting the residence determination, the elections, and the credit calculations to line up is where the real planning lives.

Common traps

• Collapsing an RRSP as a lump sum after emigrating — forfeiting the 15% treaty rate and paying 25% Canadian withholding, often without enough US foreign tax credit room to absorb it.
• Cashing out a 401(k) or IRA before age 59 1/2 — triggering the 10% IRC section 72(t) early-distribution tax in addition to ordinary tax.
• Making any contribution to a Roth IRA after becoming a Canadian resident — permanently breaking the treaty election and exposing growth to Canadian tax.
• Assuming the RRSP deferral election removes reporting — the account is still generally reportable on the FBAR (FinCEN Form 114) when foreign accounts exceed US$10,000 in aggregate at any point in the year, and may be reportable on Form 8938 when FATCA thresholds are met. See our pages on FATCA and FBAR compliance and streamlined filing procedures if filings have been missed.
• Mistiming an emigration — ignoring the interaction between retirement-account planning and Canadian departure tax, which can be addressed before the move under planning for new Canadian residents or before leaving.
• Overlooking estate exposure — large US retirement accounts feed into US estate tax exposure for Canadians, which interacts with the same treaty.

How Barrett Tax Law approaches cross-border retirement accounts

Our cross-border practice is led by Simone Barrett, who is admitted in both Ontario and Florida, so retirement-account questions are looked at from inside both tax systems at once rather than from one side with the other bolted on. We begin by fixing the facts that drive everything else — residence under Article IV, the type and timing of each account and any planned move or withdrawal, the owner's age, and citizenship status — and then map how the treaty, each country's domestic rules, and the available elections apply to that specific picture. From there we work through the sequence: which elections must be filed and by when, how to structure RRIF or pension payments to hold the reduced withholding rate, whether a paragraph 60(j) transfer makes sense, and how the foreign tax credit will absorb tax paid across the border. Where past filings are missing — an FBAR, a Form 8938, or a return — we assess the cleanest path to compliance. If any of this is on your horizon, you are welcome to book a free, confidential consultation to talk it through before a deadline or a withdrawal forecloses your options. You can read more on our cross-border tax hub and the cross-border tax overview, and in our guides on RRSP distributions for US residents, the cross-border move tax checklist, and leaving Canada and departure tax.

This page is general information, not legal advice, and reading it does not create a lawyer-client relationship. Cross-border tax outcomes depend heavily on the specific facts and on the rules of both countries, which change over time; treaty positions, withholding rates, filing thresholds and administrative practices should be confirmed for your situation before you act.