Understanding how Old Age Security works in Canada means unlearning the instinct that a pension is something you earn. OAS is not deducted from your pay, it does not appear on your pay stub, and your employment history is irrelevant to it. What the government is actually paying you for is having lived here. That single design choice explains almost everything else about the program — why an immigrant who arrived at 45 receives a smaller cheque than a neighbour who never worked a day, why the amount changes four times a year, and why high earners eventually hand it all back.

This guide covers the whole arc: how residence years build the pension, what it pays now, how the clawback removes it at the top, how GIS extends it at the bottom, and the timing decisions that are genuinely yours to make.

Residence, not contributions

Your OAS is built from the years you lived in Canada after turning 18. Forty years earns the full pension. Fewer years earn a proportional share — twenty years produces roughly half. Below that sits a hard floor: you need 10 years of residence to collect while living in Canada, or 20 years to collect while living abroad, and you must be a Canadian citizen or legal resident.

This is the cleanest contrast with the Canada Pension Plan in the entire retirement system. CPP pays nothing without contributions and everything is driven by earnings; OAS pays regardless of whether you ever held a job. Someone who spent a career raising a family with no pensionable earnings still collects a full OAS at 65 if they lived here throughout. Someone who arrived in Canada at 50 and earned a high income for fifteen years collects a full CPP and a partial OAS. Most people receive both, from two completely different logics.

What it pays, and why the number keeps moving

For the July to September 2026 quarter the maximum is $751.97 a month if you are 65 to 74, and $827.17 if you are 75 or over. The gap is a permanent 10% increase that arrives automatically the month after your 75th birthday, introduced in July 2022 — no application, no form, and it does not reduce your Guaranteed Income Supplement.

OAS is re-indexed four times a year — January, April, July and October — against the Consumer Price Index, and the protection runs one way: if the cost of living falls, payments hold rather than drop. That quarterly rhythm is unusual among federal benefits and it has a practical consequence worth internalising. Any figure quoted without a quarter attached is unreliable within three months. When you compare what you are receiving against what a website says you should be, check which quarter the website is describing before concluding something is wrong.

The clawback at the top

OAS is universal until it isn’t. Once your net world income passes a threshold, the recovery tax takes back 15 cents of every dollar above it. For 2025 income that threshold is $93,454, and the repayment it triggers is applied to payments from July 2026 through June 2027. The pension disappears entirely at $152,062 for someone aged 65 to 74, or $157,923 at 75 and over.

Two features of this design catch people repeatedly. The first is the lag: the income doing the damage was earned in a calendar year that ended eighteen months before the last affected payment, so a one-off spike — selling a property, a large RRSP withdrawal, realising capital gains — reduces a pension you will not see reduced until well afterwards. The second is that the deduction is invisible: nothing is billed, the recovery tax simply comes off each monthly payment before it reaches your account. Our OAS clawback calculator shows the exact repayment and what is left.

Worth knowing: the OAS pension itself is not part of the income that triggers its own recovery tax, and neither are GIS, the Allowance or the Allowance for the Survivor. Nearly everything else is — CPP, workplace pensions, salary, rental income, RRSP withdrawals, interest, dividends and capital gains.

GIS at the bottom

At the other end, the Guaranteed Income Supplement tops up seniors whose income is low — up to $1,123.17 a month for a single person with income under $22,800, and it is tax-free. Couples are assessed on combined income, with different maximums depending on whether the partner receives OAS, the Allowance, or neither. Two further benefits, the Allowance and the Allowance for the Survivor, cover people aged 60 to 64 in low-income households who are still too young for OAS.

The critical dependency is that GIS only flows while OAS is being paid. That makes deferral actively harmful for anyone entitled to the supplement: delaying the pension delays the supplement with it, and no amount of deferral increase compensates for years of forgone GIS. It also makes annual tax filing non-negotiable, since entitlement is recalculated each year from your return and renewed every July. The GIS amounts table has the thresholds for every situation.

The timing decision

You cannot start OAS before 65, but you can delay to as late as 70, gaining 0.6% per month — 36% at 70. On the current quarter’s rates, waiting to 70 lifts the maximum from $751.97 to $1,022.68 a month, permanently. There is no gain after 70.

Deferral makes most sense in two situations: you expect a long retirement and can afford to wait, or your income between 65 and 70 is high enough that the recovery tax would take much of the pension anyway — in which case you are trading payments you would largely repay for a permanently larger pension later. It makes least sense if you qualify for GIS, or if you need the income now. And the deferral is not automatic; it is a start date you have to choose, which is one of the few reasons an otherwise auto-enrolled person has to contact Service Canada at all.

Once it starts

Most Canadians never apply — an enrolment letter arrives around the 64th birthday confirming automatic enrolment, and the first payment lands the month after you turn 65. Payments then arrive monthly on the same twelve national dates CPP uses, so if you receive both they arrive together. OAS is taxable and nothing is withheld unless you ask, so a pensioner with other income can face an unexpected bill at filing time. Living abroad is possible with 20 years of residence, but GIS stops after an extended absence even when OAS continues. And if you start and immediately regret it, there is a narrow escape: cancel in writing within 6 months of your first payment and repay what you received within the following six.

📋 Verified with official sources: Service Canada — OAS payment amounts · Service Canada — OAS recovery tax · Service Canada — Do you qualify · Service Canada — When to start your pension

⚠️ This is general information, not financial, tax or legal advice. KnowMyGovt is an independent service with no affiliation with or endorsement by Service Canada, the Canada Revenue Agency or the Government of Canada, and is not responsible for decisions you make based on it.