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Form 1042-S is a US tax slip. If you’re a Canadian resident and it landed in your mailbox, a US payer reported income to you and may have withheld US tax, often 30%. You still report that income to the CRA, and you may be able to claim a foreign tax credit for what was withheld. (We assumed “1042 s Canada” means this slip and not a road.)
What is a 1042-S and why did I get one?
The IRS describes it as the form that reports US-source amounts paid to foreign persons, whether or not any tax was held back. The payer, called the withholding agent, files it with the IRS and gives you a copy by March 15 of the following year. To a US payer, you count as a foreign person.
The boxes you’ll look at first are these.
| Box | What it shows |
|---|---|
| 1 | Income code, the type of payment |
| 2 | Gross income |
| 3 | Exemption code, and the tax rate in 3b |
| 7a | US federal tax withheld |
Why was 30% taken out?
The IRS instructions treat 30% as the default rate when no treaty or exemption applies. To get below it, the IRS says the payer needs your taxpayer identification number on the form. A tax treaty can lower the rate for Canadians, but we couldn’t read the official treaty table figures for your income type, so check the IRS treaty tables and ask the payer which rate they used and why.
Not sure the rate was right? Talk to the payer first. Getting part of it back from the IRS depends on the case, and we didn’t confirm the steps from a page we could read.
How do you report a 1042-S in Canada?
Report the income on your Canadian return, in Canadian dollars. The CRA says to convert with the Bank of Canada rate from the day the amount arose, or the annual average for recurring payments such as pensions. Use box 2 as your gross figure, not the amount you received after withholding.
Then claim the federal foreign tax credit. The CRA’s page for line 40500 says you qualify if you were resident in Canada, reported income from outside Canada and paid tax on it there. You use Form T2209. The provincial side is a separate form, the T2036.
How much of the US tax do you get back?
Not always all of it. For each country the credit is the lesser of the foreign tax you paid and the Canadian tax on that income. Here’s a small example. You’re in Ontario, earn $80,000 of employment income, and have $2,000 (Canadian dollar equivalent) of extra US income.
The income tax calculator shows total tax rising from $14,127.85 to $14,720.85. That’s $593 more, of which $410 is federal and $183 is Ontario. If 30% were withheld, $600 would have gone to the US. The credit can’t top the Canadian tax on that income, so the extra $7 has no home in this simple case. Read the CRA page for the details of the limits.
The tax credits tool is federal only and doesn’t include the foreign tax credit. The marginal tax rate calculator tells you what Canada takes from your next dollar of income, which is the number to compare with the US rate.
Mistakes to avoid with a 1042-S
People report the net amount instead of the gross. Some forget to convert to Canadian dollars. Others toss the slip. It’s your proof of US tax withheld, so keep it with your T2209 papers. We didn’t find CRA wording that names the 1042-S, so we can’t promise it is the exact receipt the CRA wants. What the CRA does ask for is official receipts of the foreign tax paid.
Capital gains from US shares follow other rules. See the capital gains tax calculator. The US side of your tax isn’t something this site can work out.
Where the numbers come from
The form’s purpose, deadline and boxes come from the IRS page and the instructions for Form 1042-S. The credit rules come from the Canada Revenue Agency’s line 40500 page. Example tax figures are our engine’s 2026 estimates for Ontario. This site isn’t affiliated with the CRA or the IRS.
Frequently asked questions
What is a 1042-S?
A US slip that reports US-source income paid to a foreign person and any US tax withheld. The payer files it with the IRS and gives you a copy.
When do I get a 1042-S?
The IRS instructions say the form must be furnished to the recipient by March 15 of the following calendar year.
Do I report 1042-S income to the CRA?
Yes if you're a Canadian resident. Convert the amounts to Canadian dollars using the Bank of Canada rate.
Which form claims the US tax I paid?
The federal foreign tax credit uses Form T2209 and goes on line 40500. Provinces use a separate form.
Can I get all the withheld tax back through the credit?
Not always. The credit is the lesser of the foreign tax paid and the Canadian tax on that income.
- How Canadian income tax works: brackets and credits
How federal and provincial Canadian income tax stack up, what marginal and average rates mean, and how credits and deductions change your bill
Information only. This page is general information, not tax, legal or accounting advice. Tax-Services.ca is an independent publisher: we don't prepare or file tax returns or offer tax services, and we have no connection with the CRA, Revenu Québec, any government or any company named on this page. Check the figures that matter with an official source or a qualified professional.