CPP, OAS & US Social Security Coordination
A plain-language awareness tool for Canada–US retirees. It answers the big question after the 2025 rule change — does your CPP/QPP still reduce your US Social Security? — and walks through totalization eligibility and OAS portability. It does not compute your exact benefit dollars.
This is an estimate and general information, not a benefit calculation or filing/tax advice. It does not compute exact CPP, OAS, or US Social Security amounts. Confirm your situation with the SSA, Service Canada, and a cross-border or tax professional (for example a US–Canada CPA) before acting.
What changed (verified July 15, 2026): The US Social Security Fairness Act repealed the Windfall Elimination Provision (WEP) and the Government Pension Offset (GPO). CPP/QPP no longer reduces your own US Social Security, and foreign pensions no longer offset US spousal/survivor benefits. It was signed January 5, 2025, but the change is retroactive — December 2023 was the last month WEP/GPO applied, so benefits payable from January 2024 on are not reduced. The SSA reported about $17 billion in retroactive payments to 3.1 million+ people as of July 7, 2025.
Your coordination summary
Eligibility signals only — none of these are dollar amounts. Verify each with the SSA and Service Canada.
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How this is calculated
The WEP/GPO repeal (the headline)
The US Social Security Fairness Act (H.R.82) repealed the Windfall Elimination Provision and the Government Pension Offset. WEP formerly reduced your own US Social Security when you also received a "non-covered" foreign pension such as CPP or QPP; GPO reduced US spousal/survivor benefits by two-thirds of a foreign government pension. Both reductions are now $0. Precise timing: signed January 5, 2025, but retroactive — December 2023 was the last month the provisions applied, so benefits payable from January 2024 onward are unreduced. Source: SSA — Social Security Fairness Act.
Totalization — combining coverage to qualify
US Social Security normally needs 40 credits (~10 years). Under the Canada–US agreement, if you have at least 6 US quarters but fewer than 40, your Canadian CPP years are credited at 4 US quarters per year (no double-counting) to help you reach eligibility. Combining coverage establishes eligibility only — each country pays its own pro-rata benefit on its own record. Illustrative pro-rata ≈ theoretical benefit × (US credits ÷ totalized credits); e.g. 30 US + 10 credited Canadian = 30/40 = 75%. This is illustrative, not your actual amount. Sources: SSA — US–Canada totalization pamphlet, agreement text, IRS overview, 20 CFR Part 404 Subpart T.
OAS residency & portability
Old Age Security is residency-based. You can claim with 10 years of Canadian residence after 18 while living in Canada, but need 20 years to claim or keep it while living abroad — otherwise payments stop 6 months after you leave. The amount accrues at 1/40 of full OAS per year of residence after 18. Periods of US coverage counted under the agreement may help meet the threshold (for eligibility, not amount). Sources: Service Canada — OAS while receiving, OAS eligibility, CPP international eligibility.
CPP portability
Unlike OAS, CPP/QPP is contributory and not residency-based: it is paid anywhere in the world, for life, with no minimum-residence-abroad rule.
Taxation (direction only — percentages not verified)
Under the Canada–US Income Tax Convention (Article XVIII), US Social Security paid to a Canadian resident is generally taxable only in Canada, and CPP/OAS paid to a US resident is generally taxable only in the US. A commonly cited figure treats 15% of US Social Security as exempt in Canada — this percentage is not verified here; confirm the treaty text and current rules with a cross-border tax professional. The tool does not present a definitive tax outcome. Source: Global Affairs Canada — treaty text.
What this does NOT model
Exact CPP, OAS, or US SS dollar amounts (they depend on lifetime earnings, contributory periods, indexation, and claim-age adjustments); the OAS Recovery Tax (clawback) and GIS; tax-residency tie-breaker outcomes; QPP-specific administrative differences (assumed to track CPP); and the exact retroactive top-up owed to anyone previously WEP/GPO-reduced — for that, contact the SSA directly.
Common questions
Does CPP or QPP still reduce my US Social Security?
No. The US Social Security Fairness Act (H.R.82), signed January 5, 2025, repealed the Windfall Elimination Provision (WEP). WEP used to cut your own US Social Security by up to half of a 'non-covered' foreign pension such as CPP or QPP. That reduction is now $0. The change is retroactive: December 2023 was the last month WEP applied, so benefits payable from January 2024 onward are not reduced.
What was the Social Security Fairness Act and when did it take effect?
It repealed both the Windfall Elimination Provision (WEP) and the Government Pension Offset (GPO). It was signed January 5, 2025, but the benefit change is retroactive to benefits payable for January 2024. The SSA reported roughly $17 billion in retroactive payments to more than 3.1 million beneficiaries as of July 7, 2025. Anyone previously reduced by WEP or GPO should contact the SSA about back payments.
How does the Canada–US totalization agreement help me qualify?
If you have at least 6 but fewer than 40 US Social Security credits, the agreement lets you count your Canadian CPP contribution years (credited at 4 US quarters per year) toward US eligibility, and vice versa. Combining coverage establishes eligibility only — each country then pays its own pro-rata benefit computed on that country's record. You are not paid one merged benefit.
Can I keep receiving OAS if I retire outside Canada?
To keep Old Age Security while living abroad you generally need at least 20 years of Canadian residence after age 18; otherwise payments stop six months after the month you leave. You can start OAS with 10 years of residence while living in Canada. The amount accrues at 1/40 of the full pension per year of residence after 18, and periods of US coverage counted under the Canada–US agreement may help you reach the 20-year threshold. CPP, by contrast, is paid worldwide for life with no residency test.