RRSP vs. 401(k)

RRSP vs. 401(k): Key Differences for People Moving Between Canada and the U.S.

For individuals relocating between Canada and the United States, understanding how retirement accounts are structured on each side of the border is essential. The RRSP and the 401(k) serve similar purposes, but they operate under different tax regimes — and when residency changes, the interaction between these accounts and each country’s tax authority becomes a critical planning consideration.

What Is an RRSP?

A Registered Retirement Savings Plan (RRSP) is a Canadian tax-deferred retirement account governed by the Canada Revenue Agency (CRA). Contributions are made with pre-tax dollars and are deductible against Canadian earned income, up to an annual limit based on 18% of the prior year’s earned income (subject to a CRA-set dollar cap).

Investment growth inside the RRSP is sheltered from Canadian tax until withdrawal. At that point, withdrawals are taxed as ordinary income. The account must be converted to a Registered Retirement Income Fund (RRIF) or annuity by the end of the year the account holder turns 71.

RRSP contributions require Canadian earned income. Once an individual ceases to be a Canadian resident, new contributions are generally no longer possible barring ongoing Canadian-source income.

What Is a 401(k)?

A 401(k) is a U.S. employer-sponsored retirement savings plan governed by the IRS under the Employee Retirement Income Security Act (ERISA). Contributions are made on a pre-tax basis directly from employment income, reducing U.S. taxable income in the year of contribution.

Like the RRSP, investment growth inside a 401(k) is tax-deferred until withdrawal, at which point distributions are taxed as ordinary U.S. income. The IRS imposes a 10% early withdrawal penalty on distributions taken before age 59½, with limited exceptions.

Annual contribution limits are set by the IRS and are indexed annually for inflation. Employer matching contributions are common and do not count against the employee’s personal contribution limit.

 How the Canada-U.S. Tax Treaty Applies

The Canada-U.S. Tax Treaty is the central framework for cross-border retirement account treatment. Without it, both countries could potentially tax the same retirement assets — one as income, the other as annual investment growth.

Article XVIII of the treaty recognizes both RRSPs and 401(k)s as pension arrangements, generally allowing each country to defer tax on the other’s accounts until withdrawal.

Canadians Moving to the United States

When a Canadian resident becomes a U.S. resident, their RRSP does not need to be collapsed or transferred. On the contrary, non-resident planning opportunities open up to former Canadian residents holding RRSPs. As for U.S. taxation, under the Canada-U.S. Tax Treaty, the IRS agrees to recognize the RRSP as a tax-deferred account, meaning the growth inside the account is not taxed annually by the U.S.

Once U.S. residency begins, no new RRSP contributions can generally be made, as contributions require Canadian earned income. The existing account can remain in place and continue to grow tax-deferred under treaty protection, but the account is effectively frozen from a contribution standpoint.

When withdrawals are eventually taken, they will generally be taxable in the U.S. as ordinary income, though the U.S. may allow for a reduced taxable portion. Canadian withholding tax also applies, though it is may be eligible for a reduced rate under the treaty rates and is generally creditable on the U.S. return.

Americans Moving to Canada

When a U.S. resident becomes a Canadian resident while holding a 401(k), the Canada-U.S. Tax Treaty similarly allows Canada to respect the tax-deferred status of the account. Canada will generally not tax the annual growth inside the 401(k) under the same treaty agreement. That said, a special election is needed with the CRA in Canada to protect the tax-free status in Canada of Roth 401(k)s.

New 401(k) contributions are not possible once an individual leaves U.S. employment, so the account is also frozen from a contribution standpoint. If the individual continues to work for a U.S. employer on a cross-border basis, specific analysis is required to determine contribution eligibility.

Withdrawals from a 401(k) taken while residing in Canada are generally taxable in both countries, with a foreign tax credit mechanism available to prevent double taxation. If applicable, the 10% IRS early withdrawal penalty (under age 59 ½) also continues to apply regardless of Canadian residency.

The Bottom Line

The RRSP and the 401(k) are structurally similar retirement vehicles that operate under distinct national tax frameworks. The Canada-U.S. Tax Treaty provides meaningful protection for individuals who hold these accounts across borders.

For individuals in the midst of a cross-border move, the period around the transition provides for planning opportunities. With the right planning, both an RRSP and a 401(k) can remain intact, tax-deferred, and strategically managed through a residency change and into retirement.