CPP, OAS & US Social Security Coordination

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The US Social Security Fairness Act (H.R.82) repealed the Windfall Elimination Provision and the Government Pension Offset.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 pension from US federal, state or local government work not covered by Social Security. GPO never applied to CPP, QPP or any other foreign pension (SSA POMS GN 02608.100). 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). The tool counts your US years at 4 credits a year, rounded to whole credits. Under the Canada–US agreement, if you have at least 6 US credits but fewer than 40, each year in which you contributed to CPP/QPP is credited as 4 US credits (the tool counts whole years), only as many as you need to reach 40. Below 6 US credits your Canadian years count for nothing toward a US benefit. A calendar year never counts for more than 4 credits, so a year when you paid into both systems counts once; the tool assumes your CPP and US years are different years. Combining coverage establishes eligibility only. Each country pays its own benefit on its own record. If you qualify this way, the SSA pays a pro-rata benefit: a theoretical benefit worked out from your US earnings, multiplied by your US credits divided by the number of calendar quarters in your benefit computation years (usually 35 years, or 140 quarters). So 30 US credits typically earn about 30/140 of that theoretical amount, not 30/40. That needs your US earnings record, so the tool does not estimate it. 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 complete year of residence after 18: a part year is rounded down (Old Age Security Act, s. 3(4)), so 9.6 years earn 9/40, and 40 years or more earn the full pension. Periods of US coverage counted under the agreement may help meet the 10- or 20-year threshold (for eligibility, not amount). Sources: Service Canada – OAS while receiving, OAS eligibility, CPP international eligibility.

The eligibility-lines chart

Three bars on one 0 to 40 scale. Your US credits alone is your US years × 4; the tick marks the 6-credit minimum before Canadian years can count. With your CPP years added is US credits + 4 × whole CPP years, counting only the CPP credits needed to reach 40 and only once you have at least 6 US credits; below 6 it equals your US credits. Reaching 40 on this bar is what qualifies you for a US benefit; it says nothing about the amount. Years in Canada after 18 (OAS) shows complete years, each worth 1/40 of the full pension, with ticks at 10 years (claim while living in Canada) and 20 (claim or keep it abroad). Bars stop at 40. Past that, the figure beside a US bar still shows your actual credits (for example, 60 credits), while the OAS figure stays at 40/40, the full pension. Colours: red is under the first line, gold is partway (on the OAS bar, gold appears only if you live abroad: 10 to 20 years, where OAS is paid only while you live in Canada), green is a line met.

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.