Canadian Tax on US Social Security Benefits: How Canada Taxes Your American Retirement Income
Many Canadian residents receive US Social Security benefits. Some worked in the US earlier in their career and earned enough credits to qualify. Others are receiving benefits as a spouse or survivor of a US worker. Some are US citizens living in Canada who collect Social Security alongside CPP. In all cases, the question is the same: how much of the Social Security benefit is taxable, and who taxes it?
Under Article XVIII(5) of the US-Canada tax treaty, US Social Security benefits paid to a Canadian resident are taxable only in Canada, and the SSA doesn’t withhold US tax from them. That’s true for US citizens living in Canada too, because the treaty’s saving clause keeps this rule in force for citizens. Canada includes the full benefit in income and allows a deduction equal to 15% of it, so 85% of the benefit is taxed at your Canadian marginal rate (the deduction is 50% if you’ve lived in Canada and received the benefits continuously since before 1996). With no US tax on the benefit, there’s no foreign tax credit to claim.
Does the US withhold on Social Security paid to Canadians?
No. When the Social Security Administration (SSA) pays a nonresident alien, the normal rule is a 30% tax on 85% of the benefit, unless a treaty exempts it or sets a lower rate. The Canada-US treaty exempts it. IRS Publication 915 lists Canada among the countries whose residents are exempt from US tax on their benefits, and says the SSA won’t withhold US tax from benefits that are exempt for that reason.
If US tax shows up on your Form SSA-1042S anyway, it isn’t owed. You get it back by filing a US nonresident return (Form 1040-NR) that claims the treaty exemption.
US citizens living in Canada: the treaty’s saving clause normally lets the US tax its citizens as if the treaty didn’t exist, but Article XXIX(3)(a) lists paragraph 5 of Article XVIII as an exception, so a US citizen living in Canada pays no US tax on Social Security either. Publication 915 names Canada among the countries whose resident US citizens are exempt, and the SSA won’t withhold US tax from a US citizen’s benefits.
How does Canada tax the Social Security benefit?
Canada includes the US Social Security benefit in the recipient’s income on line 11500 of the T1 return (other pensions and superannuation). The benefit is converted to CAD at the exchange rate on the date of receipt (or the average annual rate, which is acceptable for periodic payments).
Canada then allows a deduction on line 25600 equal to 15% of the gross benefit. This deduction effectively reduces the taxable amount to 85% of the gross benefit, aligning with the US treatment where up to 85% of Social Security is taxable.
The 85% inclusion is not a choice. It is a fixed formula under the treaty: the full benefit is included in income, and 15% is deducted. The result is that 85% is taxable at the Canadian marginal rate. The one exception: if you have been resident in Canada and receiving US Social Security continuously since before 1996 (or you’re the surviving spouse or common-law partner of someone who was, and you meet the CRA’s other conditions), the deduction is 50%.
What if the recipient is a US citizen living in Canada?
A US citizen living in Canada is taxed on US Social Security the same way as anyone else living here: only by Canada. The saving clause in Article XXIX(2) keeps the US right to tax its citizens, but Article XXIX(3)(a) carves out paragraph 5 of Article XVIII, so the residence-only rule still applies.
US return: none of the benefit is US-taxable. IRS Publication 915 lists Canada among the countries whose resident US citizens are exempt from US tax on their benefits, so the provisional income test doesn’t come into it.
Canadian return: The full benefit is included on line 11500, with the 15% deduction on line 25600 (85% taxable). There’s no US tax on the benefit, so there’s no foreign tax credit for it.
What about CPP benefits paid to US residents?
The reverse situation: a US resident receiving Canadian CPP benefits. Under the treaty, CPP benefits paid to a US resident are taxable only in the US, so Canada has no right to tax them and the correct Canadian withholding is zero.
On the US return, the treaty treats the CPP benefit as if it were a US Social Security benefit. It goes on line 6a/6b of Form 1040, and the same provisional income test decides how much is taxable, up to 85%. With no Canadian tax on it, there’s no foreign tax credit to claim.
How does the Totalization Agreement affect eligibility?
The US-Canada Totalization Agreement affects eligibility for Social Security benefits, not the tax treatment. Under the agreement, a worker who does not have enough US credits (40 credits, roughly 10 years) to qualify for Social Security can have Canadian CPP/QPP credits counted to meet the eligibility threshold, as long as the worker has at least 6 US credits. The result is a partial US benefit (a “totalized” benefit), which is typically smaller than a full benefit.
The tax treatment of a totalized Social Security benefit is the same as a regular benefit: no US tax for a Canadian resident, and 85% taxable in Canada.
What about the OAS clawback?
Old Age Security (OAS) is a separate Canadian benefit that is income-tested. If the Canadian resident’s net income exceeds a threshold ($93,454 for 2025; $95,323 for 2026), the OAS benefit is clawed back at a rate of 15% of income above the threshold. The test uses net income (line 23400), which includes the OAS itself and the full US Social Security benefit: the 15% deduction on line 25600 is taken later, in figuring taxable income, so it doesn’t lower the clawback.
This means that a Canadian resident receiving a large US Social Security benefit may trigger an OAS clawback, effectively losing some or all of their OAS payment. The combined effect of Canadian tax on the Social Security benefit and the OAS clawback can produce a very high marginal rate on the Social Security income.
What forms are involved?
- Form SSA-1042S: the annual statement the SSA sends a nonresident alien, showing the benefits paid and any US tax withheld. For a Canadian resident the tax should be zero, and Box 6 shows “0” when a treaty exempts the benefit. A US citizen gets Form SSA-1099 instead.
- T1 return (Canadian): Reports the benefit on line 11500 and claims the 15% deduction on line 25600.
- Form 1040 (US), for US citizens only: the benefit isn’t US-taxable under the treaty, so it adds no US tax.
Related guides:
- US-Canada Totalization Agreement and Social Security/CPP
- WEP Repeal: Social Security Fairness Act and Cross-Border Impact
- When to Claim CPP vs Social Security: Timing
- Cross-Border Retirement Withdrawals: Canada-US Tax
- Form 1116: Foreign Tax Credit for Canadian Tax Changes
- US-Canada Tax Treaty Explained
- Canadian RRSP US Tax Treatment
- Self-Employment Tax: US Citizen in Canada
Start with a Diagnostic: a CPA licensed in the US and Canada reads your file and tells you in writing what's wrong and how to fix it, three to four business days after you finish the questions. The report is $250. If you hire us for any work after that, you get the $250 back as a discount on that work. Or send us your return or your letter and get a fixed price, free.
One or two plain-English guides a week on US-Canada tax. No spam, unsubscribe anytime.
Done. The next guide will land in your inbox.
Yarik Yarosh, CPA. "Canadian Tax on US Social Security Benefits: How Canada Taxes Your American Retirement Income." Blue Cloud CPA, September 4, 2026, updated October 19, 2026. https://bluecloudcpa.com/guides/canadian-tax-us-social-security-benefits
This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.