The Old Age Security (OAS) residency requirements are not simply a matter of having lived in Canada at some point. How many years you lived in Canada after age 18, whether you live in Canada when your pension is approved, and certain periods spent abroad can all affect whether you satisfy the residence rules. Under the 2026 OAS rules, you generally need at least 10 years of Canadian residence after age 18 if you live in Canada when your pension is approved. If you live outside Canada, you generally need at least 20 years. A full OAS pension generally requires 40 years of Canadian residence after age 18.
- The 10-Year OAS Residency Requirement for People Living in Canada
- The 20-Year OAS Residency Requirement When You Live Outside Canada
- How the 40-Year Residence Rule Works for Full OAS
- What Counts as Residence in Canada for OAS?
- Can Time Outside Canada Count Toward OAS Residence?
- How Social Security Agreements Affect OAS Residency Requirements
- What Happens If You Have Fewer Than 40 Years of Canadian Residence?
- How to Work Out Your Own OAS Residence History
- Other Questions About OAS Residency Requirements
Those numbers serve different purposes. The 10-year and 20-year rules determine whether someone with a shorter Canadian residence history can qualify for a partial pension. The 40-year rule generally determines whether the person qualifies for a full pension. Understanding which threshold applies to you is the key to understanding the OAS residency requirements.
The 10-Year OAS Residency Requirement for People Living in Canada
If you are living in Canada when your OAS pension is approved, the basic 2026 residence requirement is at least 10 years in Canada after age 18. Those years do not need to begin when you turn 18. Someone who moves to Canada later in adulthood can accumulate qualifying residence after arriving.
The Old Age Security Act sets out the partial-pension rule. A person who is not entitled to a full pension can qualify for a partial pension after accumulating at least 10 but fewer than 40 years of residence after age 18, provided the other applicable OAS conditions are satisfied.
The 10-year threshold is a minimum residence requirement, not the requirement for a full pension. Someone with exactly 10 qualifying Canadian years does not ordinarily receive the same OAS pension as someone with 40 qualifying years. That difference is important when assessing who is eligible for Old Age Security, because qualifying for OAS and qualifying for a full OAS pension are separate questions.
The 20-Year OAS Residency Requirement When You Live Outside Canada
The residence requirement becomes higher when you live outside Canada. Under the 2026 rules, you generally need at least 20 years of Canadian residence after age 18 to receive OAS while living abroad.
You must also generally have been a Canadian citizen or legal resident of Canada on the day before you left Canada. These requirements mean that someone with 15 qualifying Canadian years could potentially receive a partial OAS pension while resident in Canada but would not ordinarily satisfy the 20-year residence requirement for receiving it while living outside Canada.
International social security agreements can change that result in some cases. Without an applicable agreement or another qualifying exception, however, the difference between the 10-year domestic rule and 20-year overseas rule is fundamental.
The 20-year rule also matters to someone who begins receiving OAS in Canada and later moves abroad. Under the 2026 rules for receiving OAS outside Canada, a recipient who does not meet the conditions for receiving OAS abroad may have payments stop after being outside Canada for more than six months. We cover that situation separately in our guide to receiving OAS outside Canada.
How the 40-Year Residence Rule Works for Full OAS
For most people qualifying under the current rules, 40 years of Canadian residence after age 18 is the standard residence requirement for a full OAS pension. Someone with fewer than 40 years may instead qualify for a partial pension.
The 40 years do not have to run from ages 18 to 58 or fall within any particular four-decade period. What matters is the aggregate number of qualifying years of residence in Canada after age 18 and before the relevant approval point under the OAS rules.
For example, under the 2026 partial-pension formula, 20 qualifying years of Canadian residence would correspond to 20/40, or 50%, of the full OAS pension rate applicable to that person. Thirty years would correspond to 30/40, or 75%. The calculation is based on qualifying Canadian residence, not the number of years someone worked or paid Canadian income tax.
There are special full-pension provisions for certain people connected to the rules that existed before July 1977, so the 40-year test is not the only route recognized by the legislation. For most people establishing OAS entitlement today, however, the 40-year residence rule is the one that matters.
What Counts as Residence in Canada for OAS?
For OAS purposes, residence is based on whether Canada is the place where you ordinarily make your home. It is not simply a count of days physically spent inside the country.
That difference matters because OAS residence and physical presence are not always identical. The government’s OAS program guidance describes Canadian residence as periods when you normally live in Canada. As a result, a temporary trip outside Canada does not automatically break Canadian residence.
Conversely, merely spending time in Canada does not necessarily establish residence for OAS purposes. The broader circumstances surrounding where you normally live can matter. For someone with a complicated history of moving between countries, it is safer to reconstruct actual periods of residence rather than simply adding up Canadian entry and exit dates and assuming every day in Canada counts.
This is one area where we would avoid estimating from memory. A difference of even a year can matter when someone is close to the 10-year, 20-year or 40-year threshold.
Can Time Outside Canada Count Toward OAS Residence?
Some periods outside Canada can count as Canadian residence under the 2026 OAS rules. One important exception involves people who work outside Canada for certain Canadian employers.
Time working abroad may qualify when the required conditions are satisfied, including situations where the person returns to Canada within six months after the employment ends. Another provision can apply if the person turns 65 while still employed abroad and has maintained Canadian residence.
The current rules require supporting evidence, including proof of the qualifying employment and, when applicable, proof that the person physically returned to Canada. Related provisions can also apply in certain circumstances to spouses, common-law partners and dependants, as well as Canadians working abroad for international organizations.
The practical point is that a period spent outside Canada should not automatically be discarded from an OAS residence history. At the same time, overseas employment does not automatically count merely because there is some Canadian connection. The specific conditions have to be satisfied.
How Social Security Agreements Affect OAS Residency Requirements
Canada’s international social security agreements can help some people who do not independently have the required 10 or 20 years of Canadian residence. Depending on the agreement, periods of residence or contributions in the other country can be considered when determining whether the person satisfies Canada’s minimum OAS residence requirement.
This can be especially important for immigrants and Canadians who divided their adult lives between countries. Under the 2026 international pension rules, the treatment depends on the agreement Canada has with the particular country, so there is no single rule that applies to every country.
However, foreign periods used to establish eligibility do not necessarily become Canadian residence for calculating a partial OAS pension. The current OAS guidance illustrates this with a person who has eight years of Canadian residence and uses two qualifying years from a country with a social security agreement to meet the 10-year minimum. The person can qualify, but the Canadian OAS pension is based on 8/40 of the full pension, not 10/40.
That difference is easy to miss. An international agreement can help someone clear the minimum residence threshold without giving that person additional Canadian years for the partial-pension calculation. Canada has agreements with many countries, but the terms and effective dates vary by country.
What Happens If You Have Fewer Than 40 Years of Canadian Residence?
Having fewer than 40 years does not automatically make you ineligible for OAS. If you satisfy the applicable minimum residence requirement, you can generally receive a partial pension based on your qualifying years of Canadian residence.
The 2026 partial OAS calculation uses your qualifying years of Canadian residence divided by 40. Therefore, each qualifying year matters until the full-pension residence requirement is reached.
There is another rule worth knowing before starting a partial pension. Once a partial OAS pension has been approved, additional years of residence in Canada do not increase the residence fraction of that pension. Someone approved at 20/40 does not simply move to 21/40 the following year by continuing to live in Canada.
That makes the date used to establish a partial pension important for someone approaching another full year of qualifying Canadian residence. It is also one reason the residence question deserves to be settled carefully before treating an OAS estimate as final. Our separate guide to how OAS is calculated covers the payment calculation beyond the residence fraction.
How to Work Out Your Own OAS Residence History
Start at your 18th birthday and build a chronological record of where you ordinarily lived. Record the date you established residence in Canada, any periods when you moved abroad, when you returned, and any overseas employment that could fall under the special OAS rules.
For immigrants, it is useful to separate your immigration documents from your residence timeline. Your date of permanent residence can be important evidence, but the OAS residence question is ultimately about qualifying residence under the program’s rules. If you previously lived or worked in another country, also check whether that country has a social security agreement with Canada.
Pay particular attention if your total is close to 10, 20 or 40 years under the 2026 rules. Those thresholds can determine whether you satisfy the domestic minimum, the requirement for receiving OAS abroad, or the standard residence requirement for a full pension. A detailed timeline is far more useful than simply saying you have lived in Canada “about 20 years.”
Other Questions About OAS Residency Requirements
Do the years you lived in Canada before age 18 count toward OAS?
No. The 2026 OAS residence calculations discussed here use qualifying residence in Canada after age 18. Years spent in Canada during childhood therefore do not count toward the 10-year, 20-year or 40-year residence periods.
Do your years of Canadian residence have to be consecutive?
No. The Old Age Security Act refers to the aggregate period of residence after age 18. Qualifying Canadian residence can therefore consist of separate periods rather than one uninterrupted stretch, although periods spent abroad still need to be assessed under the applicable residence rules.
Does a vacation outside Canada break your OAS residence?
Not automatically. OAS residence concerns where you ordinarily make your home, so physical absence and loss of Canadian residence are not necessarily the same thing. Longer or more complicated periods abroad can require a closer assessment of your circumstances.
Can you use foreign residence to reach 40 years and receive a full OAS pension?
An international social security agreement can help you satisfy a minimum OAS qualification requirement, but foreign periods used that way do not automatically become Canadian residence for calculating the amount of a partial pension. Your entitlement depends on the terms of the applicable agreement and your actual qualifying Canadian residence.
What if Service Canada calculates fewer years of residence than you expected?
Review the periods used in the decision against your own residence timeline and supporting records. Missing or disputed periods can materially affect a partial pension when you have fewer than 40 qualifying years, so the dates are worth checking carefully rather than relying on an approximate recollection.
The most useful step before relying on any OAS estimate is to create a year-by-year residence history from age 18. Once you separate qualifying Canadian residence from periods abroad and identify any applicable exceptions or international agreements, it becomes much easier to see which of the 2026 OAS residence thresholds applies to you.
