Q I lived and worked in the U.S. from 2000 to 2008 and accumulated funds in a 401(k) retirement plan while I was there. I moved back to Toronto in 2008 but left the 401(k) in the U.S. For 2017 I decided to move the entire balance into my RRSP and earlier this year I took a full withdrawal from the 401(k). Do I need to file U.S. taxes for this withdrawal? I’ve read that a nonresident isn’t required to file U.S. tax if this is the only U.S. transaction for the year because 15% withholding tax was applied.
My second question concerns the 10% early withdrawal penalty. I was under age 59 when I took the money, but I don’t see a 10% penalty listed on my statement. If I do have to file a U.S. return, must I include that 10% penalty?
— Adam
A Adam, there are both straightforward and more nuanced parts to your situation. In short: yes, you generally need to file a U.S. tax return to report the distribution from your former 401(k), and you will likely be responsible for U.S. income tax on the withdrawal as well as any applicable 10% early withdrawal penalty unless you qualify for a specific exception.
The withholding that the plan administrator applied (for example, the 15% you mentioned) represents a prepayment of U.S. tax, not the final determination of the tax due. Withholdings are reflected on the tax slip the plan administrator issues; for U.S. retirement distributions this is typically a Form 1099-R. The plan needs your Social Security number (SSN) to issue the slip correctly. If you did not have an SSN at the time but used an Individual Taxpayer Identification Number (ITIN), you should provide that number to the plan administrator so the distribution is reported under the correct taxpayer ID. If you must renew or obtain an ITIN when filing, you generally include Form W-7 and the required identification documents along with your U.S. return.
Regarding the 10% early withdrawal penalty: that penalty is determined and reported on your U.S. tax return, not by the plan administrator at the time of distribution. If you were under age 59½ when you withdrew the funds, the penalty will generally apply unless you qualify for a statutory exception. Because the penalty is calculated on your U.S. return, it might not appear as a separate deduction on the payor’s statement; instead, it will be computed as part of your U.S. tax liability when you file.
Another important point relates to the U.S.-Canada tax treaty and withholding rates. The commonly cited 15% treaty withholding rate typically applies to periodic pension distributions. A lump-sum cash-out can be treated differently for withholding and final tax purposes. Depending on the size of the withdrawal and your overall U.S. income for the year, the ultimate U.S. tax could be more or less than the 15% that was withheld, plus any applicable early-withdrawal penalty.
On the Canadian side, you will include the distribution in your Canadian income and Canada will generally provide a foreign tax credit for taxes you paid to the U.S. This foreign tax credit offsets Canadian tax but is calculated based on the portion of your worldwide income that is attributable to U.S. source income, as reported on your T1 General. It is not necessarily a dollar-for-dollar credit for U.S. tax withheld or paid; instead, it is determined by the rules for calculating foreign tax credits in Canada, which consider the ratio of U.S. income to your total income.
Given the cross-border complexity — withholding versus final tax, the early withdrawal penalty, the application of treaty provisions, and the mechanics of claiming a foreign tax credit in Canada — it’s often worthwhile to consult a cross-border tax specialist or lawyer who can review your specific facts and documentation. They can ensure the correct U.S. return is filed, confirm whether any penalty exceptions apply, help with ITIN renewal if needed, and advise how best to claim the foreign tax credit on your Canadian return.
Cleo Hamel is a senior tax expert with American Expat Taxes in Calgary
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