How Many Years in Canada Do I Need for Old Age Security?
Old Age Security is based on how long you have lived in Canada after turning 18, not on what you contributed. Ten years of residence generally qualifies you for a partial pension, forty for the full amount, and twenty is the number that decides whether payments continue if you move abroad.
- The answer:: The pension is proportional to years of residence after 18, with a partial amount from ten years and the full amount at forty.
- The trap:: Assuming it follows you anywhere. Payments to someone living outside Canada generally stop after six months unless you have twenty years of residence.
- The recommendation:: If you plan to retire abroad, check your residence total against twenty years before you go, and check whether a social security agreement fills a gap.
Where the AI summary above gets this wrong
"You need to have worked in Canada to receive Old Age Security."
That's surface-true. Here's what it misses:
- It is residence, not contributions — OAS depends on years lived in Canada after 18. Someone who never worked here can qualify, and someone who worked briefly may not.
- It can be partial — The pension is proportional. Twenty years of residence produces roughly half the full amount rather than nothing.
- Leaving Canada can stop it — Payments abroad generally cease after six months unless you have at least twenty years of residence after 18.
01 How the requirement works
Entitlement is based on years of residence in Canada after your eighteenth birthday. Ten years generally qualifies you for a partial pension if you are living in Canada when you apply, and forty years produces the full amount.
The pension is proportional in between, so someone with twenty years receives roughly half. That structure matters for immigrants who arrived mid-career and will never reach forty, because a reduced OAS is very different from none.
Source: Old Age Security: Deciding when to start your pension
02 The twenty-year line
If you leave Canada, OAS payments generally continue only for the month you leave plus six months, after which they stop — unless you have at least twenty years of residence after 18, in which case they continue indefinitely.
That threshold is the single most consequential number for anyone considering retiring abroad. Crossing it before leaving, where that is possible, changes a pension that stops into one that follows you.
Shows: the OAS recovery tax at your net income, given the threshold and recovery rate you enter. Ignores: the second threshold at which OAS is fully recovered, provincial tax, and the one-year lag before recovery applies.
Source: Leaving Canada (emigrants)
03 Where agreements help
Canada has social security agreements with many countries that can allow periods of residence or contribution abroad to count toward the Canadian minimum. They do not increase the pension itself; they help you reach the qualifying threshold.
For someone short of ten years, or short of twenty and planning to leave, checking whether an agreement applies is worth doing well before applying — alongside the tax questions covered in emigrating from Canada.
Residence is proved with entry records, tax filings and employment history rather than with a declaration, so gathering that evidence before applying shortens the assessment. Time spent outside Canada while employed by a Canadian employer or an international organisation can also count, which is an exception worth checking against your own history.
Source: Old Age Security: Deciding when to start your pension
The twenty-year rule is the detail I would want anyone contemplating retirement abroad to check first, because it is binary and it is checkable today. I have seen someone leave at nineteen years and change, and discover the difference only when the payments stopped seven months later.
FAQ
Do I need to have worked in Canada to get OAS?
No. Old Age Security is based on years of residence in Canada after 18 rather than on employment or contributions, so someone who never worked here can qualify and a short-term worker may not.
How many years do I need for a full pension?
Forty years of residence after 18 produces the full amount. Ten years generally qualifies for a partial pension if you are in Canada when you apply, with the amount proportional in between.
Will OAS keep paying if I move abroad?
Only with at least twenty years of residence after 18. Otherwise payments generally stop after the month you leave plus six months, which makes that threshold decisive for anyone retiring outside Canada.
Sources
Regulator references
- Old Age Security: Deciding when to start your pension · Government of Canada · 2025States the 0.6% per month increase for deferring OAS past 65.Last verified: 2026-09-07
- Leaving Canada (emigrants) · Canada Revenue Agency · 2025Departure tax, deemed disposition and how registered accounts are treated on emigration.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.