RRSP vs 401(k): What Happens to Your Retirement When You Cross the Border

You moved to Canada and your 401(k) is still sitting with Fidelity or Vanguard in the United States. Your new Canadian employer is offering you an RRSP with matching contributions. Your US accountant says one thing, your Canadian HR department says another, and Google is giving you twelve contradictory answers. This is not a niche problem — an estimated 700,000 to 1 million US citizens live in Canada, and nearly every one of them faces this exact question: what do I do with my American retirement account now that I live here, and should I be contributing to the Canadian one?

The short version: you cannot roll a 401(k) into an RRSP. The two systems do not connect. But you can — and in most cases should — participate in both, provided you understand the treaty rules that prevent double taxation and the filing requirements that keep you compliant with the IRS and CRA simultaneously. This guide covers every angle: contribution limits, tax treatment, withdrawal rules, treaty elections, and the specific dollar math that shows what these decisions actually cost.

Side-by-Side Comparison: RRSP vs 401(k) in 2026

Before diving into the cross-border complications, here is how these two retirement vehicles compare on their own terms:

Can You Roll a 401(k) Into an RRSP? No — Here's Why

This is the most-searched question in cross-border retirement planning, and the answer is unambiguous: no, you cannot roll a 401(k) into an RRSP. There is no direct transfer, indirect rollover, trustee-to-trustee mechanism, or any other pathway that moves funds from a US qualified retirement plan into a Canadian registered plan without triggering full taxation.

The reason is structural. A 401(k) exists under the US Internal Revenue Code (IRC Section 401(a)). An RRSP exists under Canada's Income Tax Act (Section 146). The US-Canada Tax Treaty — specifically Article XVIII — addresses how each country taxes the other country's retirement plans, but it does not create a transfer mechanism between them. The Treaty preserves tax deferral; it does not merge the two systems.

What actually happens if you try to "move" money from your 401(k) to your RRSP:

1. You withdraw from the 401(k) — this is a taxable distribution in the US, subject to federal income tax at your marginal rate plus a 10% early withdrawal penalty if you are under 59.5
2. The US plan withholds tax — 20% mandatory federal withholding on lump-sum distributions for US residents; Treaty-reduced rates for Canadian residents (15% periodic, up to 25% lump sum)
3. You contribute to your RRSP — but only if you have available RRSP contribution room from Canadian earned income. The 401(k) withdrawal itself does not create RRSP room
4. Canada taxes the withdrawal — the 401(k) distribution is included in your Canadian T1 income, offset by Foreign Tax Credits for US tax paid

The net result: you pay full tax on the withdrawal in both countries (mitigated by FTCs), you lose the tax-deferred compounding, and you can only contribute to the RRSP to the extent you have room from Canadian employment — not from the 401(k) proceeds. This is almost never the right move.

What to Do With Your 401(k) After Moving to Canada

You have three realistic options. The right choice depends on your age, account balance, investment preferences, and whether your former employer's plan allows non-resident participants.

Option 1: Leave It in the 401(k) Plan

If your balance exceeds $7,000 (the SECURE 2.0 threshold below which employers can force you out), you can generally leave your 401(k) with your former employer's plan. Growth remains tax-deferred in the US, and Canada also defers tax on the growth if you make the annual Treaty election on your T1 return.

Pros: No immediate tax hit; continued tax-deferred growth; no paperwork beyond the annual Canadian Treaty election. Cons: Limited to the plan's investment menu; no new contributions; some plans restrict non-employee participants from making changes; administrative headaches if the company changes plan providers.

Option 2: Roll Into a Traditional IRA (Recommended for Most People)

A rollover from a 401(k) to a traditional IRA is a tax-free trustee-to-trustee transfer under IRC Section 402(c). No distribution occurs, no tax is triggered, and the funds remain in a US tax-deferred account. Canada continues to defer tax on the IRA growth under the same Treaty Article XVIII(7) election.

Pros: Full investment flexibility (stocks, bonds, ETFs — avoid Canadian mutual funds/PFICs); lower fees than most employer plans; easier to manage from Canada with a US brokerage (Schwab, Fidelity, Interactive Brokers). Cons: Some US brokerages will not open or maintain IRA accounts for Canadian residents — confirm before moving. Interactive Brokers and Schwab International generally accommodate Canadian-resident US citizens.

Option 3: Take a Distribution (Rarely Advisable)

As shown in the dollar example above, cashing out triggers immediate taxation in both countries plus the 10% US penalty if under 59.5. This option makes sense only in narrow circumstances: very small balances (under $10,000 where administrative costs exceed the tax hit), critical short-term cash needs, or situations where the account holder is already over 59.5 and in a low-income year in both countries.

Treaty Article XVIII: The Engine That Makes Cross-Border Retirement Work

Article XVIII of the US-Canada Tax Treaty is the single most important provision for cross-border retirement planning. It operates in two directions:

Direction 1: US Defers Tax on Your RRSP (Article XVIII, Paragraph 7)

Without the Treaty, the IRS would treat your RRSP as a foreign grantor trust and tax the annual income inside it — dividends, interest, capital gains — as it accrues, even though you cannot access the funds without a Canadian tax hit. Article XVIII(7) allows you to elect deferral, aligning the US treatment with Canada's.

Since Revenue Procedure 2014-55, this election is considered automatically made if you file your US return on time and have not previously reported the RRSP income inconsistently. However, to claim a US deduction for RRSP contributions, you need Article XVIII(2) and Form 8833.

Direction 2: Canada Defers Tax on Your 401(k)/IRA (Article XVIII, Paragraph 7)

The mirror image: without the Treaty, Canada could tax the annual growth inside your US 401(k) or IRA because you are a Canadian resident with foreign investment income. Article XVIII(7) allows you to elect deferral on your Canadian T1 return, just as Canadians get deferral on their own RRSPs.

This election is NOT automatic on the Canadian side. You must attach a written statement to your T1 return each year identifying each US retirement account and electing Treaty deferral. Missing this election gives the CRA a basis to assess tax on the accrued growth retroactively.

Direction 3: US Deduction for RRSP Contributions (Article XVIII, Paragraph 2)

This is where most people get confused. RRSP contributions are deductible in Canada — that part is straightforward. But are they deductible in the US? Under Article XVIII(2), yes, with conditions:

• The contributions must be attributable to Canadian-source earned income (salary, self-employment income earned in Canada)
• The deduction cannot exceed the lesser of your RRSP contribution limit or the US 401(k) elective deferral limit (US$23,500 in 2026)
• The US deduction is reduced by any actual contributions to a US plan (401(k), 403(b), etc.) for the same year
• You must file Form 8833 (Treaty-Based Return Position Disclosure) with your Form 1040 to claim this deduction

RRSP Contributions as a US Citizen: The Full Tax Picture

Here is the layered reality of what happens when a US citizen in Canada contributes to an RRSP:

In Canada: The contribution is fully deductible from your Canadian income, reducing your combined federal-provincial tax. If you are in Ontario's 43.41% combined marginal bracket on income over C$111,733, a C$20,000 RRSP contribution saves you C$8,682 in Canadian tax. This works identically whether you are a Canadian citizen or a US citizen — the CRA does not care about your US status.

In the US (without Treaty election): The RRSP contribution is not deductible. Your RRSP is a foreign trust. Annual growth is taxable. You get the worst of both worlds — no deduction and current taxation on phantom income.

In the US (with proper Treaty elections and Form 8833): The contribution is deductible up to the limits described above. The growth is deferred. When you eventually withdraw, both countries tax it, but the Foreign Tax Credit eliminates double taxation. You get the best available outcome — deductions and deferral in both countries simultaneously.

The difference between "without" and "with" Treaty elections on a $300,000 RRSP growing at 7% over 20 years is approximately $80,000 to $120,000 in avoided US taxes on phantom income. This is not optional paperwork.

The Roth IRA Opportunity: Convert Before You Cross the Border

If you are planning a move to Canada and hold a traditional IRA or old 401(k) funds in a traditional IRA, converting to a Roth IRA before you establish Canadian residency is one of the highest-value moves in cross-border tax planning. Here is why:

• The conversion is taxable only in the US. Because you are not yet a Canadian resident, Canada has no jurisdiction over the transaction. There is no Canadian tax on the conversion amount.
• Future Roth growth is tax-free in the US (qualified distributions after age 59.5 and five years).
• Future Roth distributions are excluded from Canadian income under Article XXI(1) of the Treaty, which exempts income that is exempt in the country of source (the US).
• The result is permanent double tax exemption — no US tax on qualified distributions, no Canadian tax on distributions. The only tax paid was the one-time US conversion tax.

Critical timing: The conversion must occur before you establish Canadian residential ties. If you convert after becoming a Canadian resident, the conversion amount is included in your Canadian T1 income — the CRA treats it as a withdrawal from a foreign retirement plan. The entire planning advantage disappears.

Spousal RRSP Considerations for Dual-Filing Couples

Canada's spousal RRSP is a powerful income-splitting tool that has no US equivalent. The higher-earning spouse contributes to an RRSP owned by the lower-earning spouse, using the contributor's RRSP room. The contribution is deductible on the contributor's Canadian return, but when the funds are eventually withdrawn, they are taxed in the hands of the lower-earning spouse (after the three-year attribution period).

For US-filing couples, the spousal RRSP introduces additional complexity:

• The US does not recognize spousal RRSP deductions. Only contributions to your own RRSP qualify for the Treaty-based US deduction under Article XVIII(2). If you contribute C$15,000 to your spouse's RRSP, you get a C$15,000 Canadian deduction but no US deduction.
• Both spouses' RRSPs must be reported on the FBAR if the US-person spouse has signature authority or ownership interest. A spousal RRSP is owned by the non-contributing spouse, so it appears on the account-holder spouse's FBAR.
• The three-year attribution rule is a Canadian rule. Withdrawals from a spousal RRSP within three calendar years of the last contribution are attributed back to the contributing spouse for Canadian tax purposes. The US does not apply this attribution — the US taxes the account owner on the withdrawal. This can create a mismatch where the same withdrawal is taxed to different people in different countries.
• If only one spouse is a US citizen, only that spouse has US filing obligations. The non-US spouse's RRSP is not reported on the US citizen's FBAR unless the US citizen has signature authority over it.

RRSP Withdrawals vs 401(k) Withdrawals: Tax Treatment for Canadian Residents

Both RRSP and 401(k) withdrawals are fully taxable as ordinary income in both countries when you are a Canadian resident. The mechanics differ:

RRSP withdrawals: Your Canadian financial institution withholds tax at source — 10% for amounts up to C$5,000, 20% for C$5,001 to C$15,000, and 30% for amounts over C$15,000. The full withdrawal is included in your Canadian T1 income and your US Form 1040 income. You claim a Foreign Tax Credit on your US return (Form 1116) for the Canadian tax paid. Because Canadian rates typically exceed US rates at comparable income levels, the FTC usually eliminates the US tax entirely.

401(k) withdrawals while living in Canada: Your US plan withholds tax — the Treaty reduces the withholding rate to 15% on periodic pension payments. The full withdrawal is included in your US Form 1040 income and your Canadian T1 income. You claim a Foreign Tax Credit on your Canadian return (Form T2209) for the US tax withheld. File Form W-8BEN with your US plan custodian to claim the Treaty withholding rate; otherwise, the default 30% non-resident rate applies.

The 10% US penalty trap: If you withdraw from your 401(k) or traditional IRA before age 59.5, the US imposes a 10% early withdrawal penalty under IRC Section 72(t). This penalty is not a tax — it is a penalty — and therefore is NOT eligible for the Foreign Tax Credit in Canada. You pay it on top of whatever income tax both countries assess. For a US$50,000 early withdrawal, that is an extra US$5,000 with no offset anywhere.

Investment Choices: Avoiding PFICs Inside Your RRSP

What you hold inside your RRSP matters for US tax purposes. Canadian mutual funds — the kind your bank will put in your RRSP by default — are classified as Passive Foreign Investment Companies (PFICs) under IRC Section 1297. While the Treaty election defers taxation of RRSP income, there is ongoing IRS ambiguity about whether PFIC reporting on Form 8621 is still required for investments held within a treaty-deferred RRSP.

The safest approach: hold US-listed ETFs inside your RRSP. US-listed ETFs are not PFICs. Many Canadian brokerages — Questrade, Interactive Brokers, TD Direct Investing — allow US-listed securities in RRSP accounts. An additional benefit: under Article XXI of the Treaty, US dividends paid to a Canadian RRSP are exempt from the standard 15% US withholding tax. A Canadian-listed ETF holding the same US stocks does not receive this exemption.

Filing Requirements Checklist: Both Countries

If you are a US citizen living in Canada with both an RRSP and a 401(k)/IRA, here are your annual filing obligations:

United States (IRS):

• Form 1040 — report worldwide income including any RRSP or 401(k) withdrawals
• Form 1116 — Foreign Tax Credit for Canadian taxes paid
• Form 8833 — if claiming Treaty deduction for RRSP contributions (Article XVIII(2))
• Revenue Procedure 2014-55 statement — deferral election for RRSP income (generally automatic)
• FinCEN Form 114 (FBAR) — report RRSP and all Canadian accounts if aggregate exceeds US$10,000
• Form 8938 (FATCA) — if foreign financial assets exceed $200,000/$300,000 thresholds (living abroad)
• Form 8621 — for each PFIC held (Canadian mutual funds, if any, including inside RRSP if taking conservative position)

Canada (CRA):

• T1 Income Tax Return — report worldwide income including any 401(k) or IRA withdrawals
• Annual Treaty deferral election statement — attached to T1 for each US retirement account (401(k), IRA, Roth IRA)
• Form T2209 — Federal Foreign Tax Credits for US taxes paid
• Form T1135 — Foreign Income Verification Statement if total cost of foreign property exceeds C$100,000 (includes US brokerage accounts, 401(k), IRA)
• RRSP contribution receipt — Schedule 7 with your T1 return

Comprehensive Tax Math: RRSP vs 401(k) Over 20 Years

To make this concrete, here is a full scenario comparing both vehicles for a US citizen living in Ontario:

Profile: Emily, age 40, US citizen, Ontario resident. Canadian salary: C$140,000. No US-source income. Marginal Canadian tax rate: 43.41%. US effective rate after FTC: approximately 0% (Canadian taxes exceed US taxes). Contributes C$25,000/year to her RRSP. Investments earn 7% annually.

The message is clear: proper Treaty elections and Form 8833 filings are not optional paperwork — they are worth tens of thousands of dollars over a career.

Common Mistakes to Avoid

1. Attempting a 401(k)-to-RRSP rollover. No mechanism exists. The withdrawal is fully taxable.
2. Forgetting the Canadian Treaty election for your 401(k)/IRA. The US election (Rev. Proc. 2014-55) is generally automatic. The Canadian election is not — you must attach it to your T1 every year.
3. Not filing Form 8833 when claiming the RRSP deduction on your US return. The $1,000 penalty per failure adds up.
4. Holding Canadian mutual funds in your RRSP. These are PFICs. Use US-listed ETFs instead.
5. Missing the Roth conversion window. Once you establish Canadian residency, the conversion triggers Canadian tax. The pre-immigration window is the only tax-efficient opportunity.
6. Withdrawing from a 401(k) before age 59.5 to "fund" an RRSP. The 10% US penalty is not creditable in Canada, and you need Canadian earned income for RRSP room anyway.
7. Ignoring the spousal RRSP US deduction limitation. Contributing to your spouse's RRSP gives you a Canadian deduction but not a US one.
8. Filing Form W-8BEN incorrectly (or not at all) with your US retirement plan. Without it, lump-sum 401(k) distributions face 30% US withholding instead of the Treaty's 15%.

Action Steps for 2026

1. If you recently moved to Canada: Roll your 401(k) to a traditional IRA at a brokerage that services Canadian-resident US citizens. Do NOT cash it out.
2. If you haven't moved yet: Convert as much traditional IRA/401(k) to Roth as your tax bracket allows BEFORE establishing Canadian residency.
3. Start contributing to your employer RRSP: Get the employer match. File Form 8833 with your next US return to claim the Treaty deduction.
4. Audit your RRSP investments: Replace any Canadian mutual funds with US-listed ETFs to avoid PFIC issues.
5. Confirm your Canadian Treaty elections are current: Review past T1 returns for the annual 401(k)/IRA deferral statement. If missing, file amended returns.
6. File your FBAR: Include your RRSP. The October 15 extended deadline is approaching.
7. Engage a cross-border tax specialist: The interaction of IRC, Canada's ITA, and the Treaty is too complex for single-country preparers. A missed election or wrong form costs more than the advisory fee.