How this calculator works
Old Age Security pays a full pension after 40 years of residence in Canada after age 18, and one fortieth of it for each year short of 40, so long as you have at least 10 years. This page takes your years of residence, your age and the net income the recovery tax is based on. The maximum monthly pension for October to December 2026 is $762.50 from 65 to 74 and $838.75 from 75. The recovery tax takes back 15% of net income above $93,454, the threshold that applies from July 2026, and the pension is fully recovered at $152,062 for ages 65 to 74 and $157,923 at 75 and over. The page assumes you qualify and are paid the full residence share: it does not model the 20-year rule for people living abroad, the Guaranteed Income Supplement, the allowance for the survivor or the spouse of a GIS recipient, partial OAS for a spouse who has never lived in Canada, or the monthly rather than annual payment of the recovery tax.
Formula
Residence share = min(1, years in Canada after 18 / 40). Monthly pension = the maximum for your age band x residence share. Annual pension = monthly x 12. Recovery tax = min(annual pension, 15% x max(0, net income - $93,454)). Net pension = annual pension - recovery tax.
Worked example
Forty years of residence at 70 gives the full $762.50 a month, or $9,150 a year, and net income of $60,000 is below the threshold, so nothing is recovered. Twenty years at 76 gives half of $838.75, or $419.38 a month and $5,032.50 a year; with $100,000 of income the recovery tax is 15% of $6,546, or $981.90, leaving $4,050.60. At $200,000 of income the recovery tax would exceed the pension, so the whole $9,150 is recovered.
Frequently asked questions
How many years do I need?
At least 10 years of residence in Canada after age 18 to receive any OAS inside Canada, or 20 years if you live outside Canada. The full pension needs 40 years.
What is the recovery tax?
A repayment of 15% of net income above $93,454. It is deducted from OAS payments starting in July, based on the income you reported for the previous year.
Why is the 75 and over amount higher?
OAS pays a 10% increase from the month after you turn 75. The calculator applies it for the whole year once your age input is 75 or more.
Does this include the Guaranteed Income Supplement?
No. The GIS is a separate income-tested benefit for low income seniors, and it is not part of this calculation.