CPP, OAS and GIS Explained: Canada's Public Retirement Income Pillars

How the Canada Pension Plan, Old Age Security and the Guaranteed Income Supplement work together, what taking them early or delaying them actually costs or gains you, and how these public pillars fit alongside your own retirement savings.

Canada's Three Public Retirement Income Pillars

Retirement income planning in Canada usually rests on three legs: your own personal savings (RRSP, TFSA, workplace pension and other assets), and two government programs designed to provide a baseline of income regardless of how much you personally saved - the Canada Pension Plan (CPP) and Old Age Security (OAS), with the Guaranteed Income Supplement (GIS) available on top of OAS for lower-income seniors.

CPP: An Earnings-Based Pension

CPP is funded by contributions deducted from your paycheque throughout your working life (matched by your employer, or paid in full if self-employed), and the pension you eventually receive is based on how much and how long you contributed. The standard age to begin CPP is 65, though you can start as early as 60 or delay as late as 70. For the January-March 2026 quarter, the maximum monthly CPP retirement pension at age 65 is $1,507.65, though most recipients receive less than this maximum since it depends on individual contribution history.

OAS and GIS: Residency-Based Support

OAS is available from age 65 to most Canadians who meet minimum residency requirements, and unlike CPP it is not based on your work or contribution history. For the January-March 2026 quarter, the maximum monthly OAS payment is $742.31 for ages 65-74 and $816.54 for ages 75 and older. Higher-income seniors are subject to the OAS Recovery Tax, commonly called the clawback: for 2026, OAS starts being reduced once net income passes $95,323 and is fully eliminated by $154,708 for those aged 65-74, with thresholds reviewed periodically. GIS is an additional income-tested benefit paid on top of OAS to lower-income seniors; for the same quarter, the maximum monthly GIS for a single pensioner is $1,108.74, though the actual amount depends heavily on other income and is recalculated each year from your tax return.

The Cost and Benefit of Taking Benefits Early vs. Delaying

• CPP started before 65 is reduced by about 0.6% for each month before your 65th birthday, up to a maximum reduction if started at age 60
• CPP delayed past 65 increases by about 0.7% for each month of delay, up to a maximum increase if started at age 70
• OAS cannot start before age 65, but delaying it past 65 increases the payment by about 0.6% per month of delay, up to a maximum increase at age 70
• Delaying either benefit generally only pays off if you expect to live well into your 80s or beyond and can afford to bridge the gap with other income in the meantime

Timing decisions aside, it helps to remember that CPP, OAS and GIS were never designed to fully replace pre-retirement income on their own - they form a baseline that personal savings, workplace pensions and insurance-based strategies are meant to build on top of. Knowing roughly what to expect from each pillar, and when to start each one, is a key input into how much you need to save personally and how to structure withdrawals from your RRSP, RRIF and TFSA around them.