Social Security and Medicare After Moving to Canada: Your Credits Survive, Your Checks Follow, and Only Canada Taxes Them

Short version: U.S. Social Security for Canadian Residents

Social Security is the piece of the US system that moves best. The credits you earned are yours regardless of address; the SSA pays benefits to residents of Canada without suspension; and if your US work history is short of the 40 credits needed to qualify, the US–Canada totalization agreement lets your Canadian work years count toward qualification (each country then pays a benefit proportional to its own record — totalization fills the eligibility gap, it does not merge the checks). Taxation is cleaner than almost any other cross-border income: under treaty Article XVIII(5), US Social Security paid to a Canadian resident is taxable only in Canada — nothing on the 1040, no withholding — and Canada includes only 85% of it, exempting 15% by treaty. CPP and OAS, which you will likely also build, are the mirror image for a US person: paid alongside, taxed by the residence country. Two more pieces complete the picture. The Windfall Elimination Provision, which for decades reduced Social Security for people also receiving CPP, was repealed by the Social Security Fairness Act — retirees previously WEP-reduced or WEP-fearing should re-run their numbers. And Medicare simply does not operate in Canada: no coverage for care received there, which matters less than arrivals fear (provincial health insurance takes over after the waiting period) but shapes the enrollment decision — whether to pay Part B premiums for coverage you cannot use, against the late-enrollment penalties if you ever move back.

Key takeaways

• Benefits are payable in Canada — direct deposit to Canadian accounts works, and Canada is not among the countries where SSA payments are restricted.
• Qualification via totalization: short a few US credits? Canadian coverage periods count toward the 40-credit test; the US then pays a pro-rated benefit based on the US earnings actually on record. The same works in reverse for CPP/OAS qualification.
• Taxation (Article XVIII(5)): US Social Security received by a Canadian resident — taxed only by Canada, with 15% exempt; report 85% on the T1, nothing on the 1040. CPP and OAS received by a US-citizen Canadian resident — also taxed by Canada as the residence country.
• WEP is repealed: CPP receipt no longer reduces the Social Security check under the Windfall Elimination Provision; benefits previously reduced were restored. Anyone who planned around WEP should update projections.
• OAS has its own residence math: OAS eligibility and amount depend on years of Canadian residence after 18 (partial OAS from 10 years, with the totalization agreement helping the threshold); an arriving 50-year-old builds a partial OAS by 67 — worth having in the retirement model rather than discovering.
• Medicare: no coverage in Canada. The individual decision is whether to keep Part B (premiums for optionality, protection against late-enrollment penalties on a return) or drop it — driven by the realistic probability of moving back and by snowbird plans, since heavy US time is where Medicare re-enters the picture.

Timing the claim from Canada

The claiming-age analysis (62 versus full retirement age versus 70) survives the move intact and gains one wrinkle: the benefit will be taxed at your Canadian marginal rate on 85% of it, so the deferral math runs on Canadian after-tax dollars — and interacts with OAS clawback territory for higher-income retirees, since Social Security inclusion raises the net income that drives the OAS recovery tax. High-income retirees in Canada sometimes find delaying Social Security while drawing down RRSPs earlier produces a better clawback profile; the sequencing is a Canadian optimization applied to an American benefit.

Worked example

A 64-year-old moves from Phoenix to Kelowna with 38 US credits — two short of qualifying — and eight years of Canadian work in her past plus more ahead. Totalization: her Canadian years carry her over the 40-credit threshold; the SSA computes a pro-rated benefit on her actual US earnings record — say US$1,400 a month at full retirement age instead of the US$1,550 a full domestic career would have paid. She claims at 67: the checks deposit in Kelowna; nothing appears on her 1040; her T1 includes 85% of the CAD value at her BC marginal rate. Her CPP (from the Canadian years, growing with new ones) and a partial OAS layer on top, both Canada-taxed. Medicare: she drops Part B after modeling — her return-to-US probability is low and her snowbird weeks are covered by travel insurance — accepting the penalty risk with open eyes. The line item she re-checked after the law changed: her CPP no longer WEP-reduces the US$1,400, which is US$150 a month better than the projection she moved with.

Official sources

The Social Security Administration explains that the totalization agreement between the United States and Canada helps people who have worked in both countries qualify for benefits by combining credits, and assigns coverage so that workers pay social security taxes to only one country for the same work. — Social Security Administration, Totalization Agreement with Canada, https://www.ssa.gov/international/Agreement_Pamphlets/canada.html

Social security benefits "paid to a resident of the other Contracting State shall be taxable only in that other State," and "a benefit under the social security legislation in the United States paid to a resident of Canada shall be taxable in Canada as though it were a benefit under the Canada Pension Plan, except that 15 per cent of the amount of the benefit shall be exempt from Canadian tax." — Canada-United States Tax Convention, Article XVIII(5), https://www.canada.ca/en/department-finance/programs/tax-policy/tax-treaties/country/united-states-america-convention-consolidated-1980-1983-1984-1995-1997.html

Practitioner note

Social Security is the rare topic where the news for movers is almost entirely good — payable, totalized, taxed once at a discount, and recently improved by the WEP repeal. The planning that remains is sequencing: the claim age, the RRSP drawdown, and the OAS clawback interact, and the best answer is a Canadian retirement-income plan that happens to include an American pension.

See also: how your cost basis steps up on arrival; and browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the cross-border retirement income plan — totalization and claiming strategy, the Canada-only taxation mechanics, OAS/CPP integration, and the Medicare keep-or-drop decision. See cross-border pricing or book a call.