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Canadian Tax on US Social Security Benefits: How Canada Taxes Your American Retirement Income

By Yarik Yarosh, CPA ·September 4, 2026 ·7 min read
Written by Yarik Yarosh, CPA (US & Canada) September 4, 2026 · FL CPA license AC61704 · CPA Ontario

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?

✓Key takeaway

Under Article XVIII of the US-Canada tax treaty, US Social Security benefits paid to a Canadian resident are taxable only in Canada. The US retains the right to withhold up to 15% of the gross benefit (reduced from the 30% statutory rate by the treaty). Canada includes the benefit in income but allows a deduction equal to 15% of the gross benefit (effectively taxing only 85% of the benefit), mirroring the US domestic treatment where up to 85% of Social Security may be included in income. The Canadian taxpayer claims a foreign tax credit for the US withholding (15%), which reduces the Canadian tax. For most Canadian residents in a moderate-to-high tax bracket, the US withholding is fully absorbed by the foreign tax credit, and the net result is that the benefit is taxed only by Canada at the Canadian marginal rate on 85% of the benefit.

How does the US withhold on Social Security to Canadians?

When the Social Security Administration (SSA) pays benefits to a non-resident of the US (including a Canadian resident who is not a US citizen), the SSA withholds 30% of the gross benefit unless the recipient provides a treaty claim. Under the US-Canada treaty, the withholding rate is reduced to 15%.

To claim the reduced 15% rate, the Canadian resident files Form W-8BEN with the SSA, certifying that they are a resident of Canada for treaty purposes. Without the W-8BEN, the SSA withholds at 30%.

US citizens living in Canada: US citizens are not subject to the nonresident withholding. Their Social Security benefits are reported on the US return (Form 1040) and taxed under the normal US rules (up to 85% of benefits included in income, depending on provisional income). The treaty still applies to determine Canada’s taxing rights, but the US does not withhold on payments to its own citizens.

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.

What if the recipient is a US citizen living in Canada?

A US citizen living in Canada reports the Social Security benefit on both the US and Canadian returns:

US return: Up to 85% of the benefit is included in income, depending on the taxpayer’s provisional income (adjusted gross income + tax-exempt interest + 50% of Social Security benefits). If provisional income exceeds $44,000 (married filing jointly) or $34,000 (single), up to 85% is taxable. Below $32,000/$25,000, none is taxable.

Canadian return: The full benefit is included on line 11500, with the 15% deduction on line 25600 (85% taxable). A foreign tax credit is claimed for the US tax paid on the benefit.

For a US citizen in a high Canadian tax bracket, the Canadian tax on 85% of the benefit exceeds the US tax, and the FTC absorbs the US tax. The net result is Canadian-rate taxation only.

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. Canada withholds 25% (reduced to 15% by the treaty) on CPP payments to non-residents.

On the US return, the CPP benefit is reported as foreign pension income on line 5a/5b (or Schedule 1, depending on the form year). The full amount is taxable (unlike US Social Security, which has the provisional income test; CPP does not receive partial exclusion treatment on the US return). The US taxpayer claims a foreign tax credit for the Canadian withholding.

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 combine Canadian CPP contributions with US credits to meet the eligibility threshold. The benefit is then calculated based on the worker’s actual US earnings only (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: 15% US withholding for Canadian residents, 85% taxable in Canada, foreign tax credit for the US withholding.

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 ($90,997 for 2025), the OAS benefit is clawed back at a rate of 15% of income above the threshold. US Social Security benefits included in Canadian income (at the 85% level) count toward the OAS clawback threshold.

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?

  • W-8BEN (filed with the SSA): Claims the 15% treaty withholding rate. Filed once; the SSA applies the reduced rate to all future payments.
  • Form SSA-1042S: Annual statement from the SSA showing the gross benefit paid and the amount withheld. The Canadian resident uses this to prepare both the US and Canadian returns.
  • T1 return (Canadian): Reports the benefit on line 11500, claims the 15% deduction on line 25600, and claims the foreign tax credit on line 40500.
  • Form 1040 (US), for US citizens only: Reports the benefit on line 6a/6b and calculates the taxable amount using the provisional income formula.
  • Form 1116 (US): Claims the foreign tax credit for Canadian tax paid (relevant for US citizens who pay Canadian tax on the benefit).

Related guides:

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Cite this page

Yarik Yarosh, CPA. "Canadian Tax on US Social Security Benefits: How Canada Taxes Your American Retirement Income." Blue Cloud CPA, September 4, 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.