Canada OAS Calculator

Worked example

Take the default case: 40 years of Canadian residency after age 18, starting OAS at the standard age of 65. Forty years is the threshold for a full pension, so the residency proportion is 100 percent and there is no deferral bonus. That gives a monthly OAS of about $728, or roughly $8,732 over the year. Now compare deferring to age 70. OAS grows 0.6 percent for every month you wait past 65, which over the full 60 months is a 36 percent permanent increase, lifting the monthly amount to about $990. Residency cuts the other way: someone with only 20 years in Canada qualifies for half the full amount, since the partial pension is years divided by 40, so they would receive about $364 a month at 65. The tool layers these two factors, the residency proportion and the deferral bonus, on top of the maximum.

How it is calculated

Old Age Security is a residency-based pension, not a contribution-based one like CPP, so the amount depends on how long you have lived in Canada rather than what you earned. The tool starts from the maximum monthly pension and applies two multipliers. The first is the residency proportion: full OAS needs 40 years in Canada after age 18, and fewer years give a pro-rated partial pension equal to your years divided by 40, with a minimum of 10 years to qualify at all. The second is the deferral bonus: every month you delay starting past age 65 adds 0.6 percent, so deferring the maximum five years to age 70 adds 36 percent permanently. The two factors multiply together, then scale up to an annual figure. The maximum used here is illustrative and is indexed quarterly to inflation. The tool does not model the OAS recovery tax, or clawback, which reduces payments once net income passes a high threshold, so a separate clawback calculator is linked for high-income retirees.