Why some people get OAS automatically and others get a letter asking them to apply

Dear reader,

Two neighbours, born a week apart, both lived and worked in Canada all their adult lives. Around their 64th birthdays, one receives a letter saying she has been enrolled for the Old Age Security pension and does not need to do anything. The other receives a letter inviting him to apply. Neither has done anything wrong, and neither letter is a mistake.

The difference lies in a phrase on the Government of Canada’s OAS page: you are enrolled automatically if Service Canada has enough information to decide your eligibility.¹ This letter explains what that means in practice, what each letter asks of you, and what to do if no letter comes at all.

Letter one: you have been enrolled

If Service Canada already holds what it needs, such as your date of birth, your legal status and enough evidence of your years of residence in Canada, it sends an enrolment letter around the 64th birthday and you do not have to apply.¹

That does not mean the letter can be filed unread. The official page lists three situations in which you must act even after being enrolled: if the information in the letter is wrong, if you want to delay the start of the pension, or if you want to change the start date.¹

Letter two: please apply

If Service Canada cannot confirm eligibility from its own records, the letter instead asks you to apply. That is common for people who arrived in Canada as adults, spent years living abroad, or have records under more than one name. It says nothing about whether you qualify, only that Service Canada needs more information to decide.

You can apply online through My Service Canada Account once you are at least one month past your 64th birthday, or on paper with the Application for the Old Age Security Pension and the Guaranteed Income Supplement (ISP-3550). If you live outside Canada, the paper form is the route, sent to the Service Canada office for your last province or territory of residence.¹

The two letters side by side

	Enrolment letter	Invitation to apply
Why you got it	Service Canada has enough information	It needs more information
What you must do	Check the details; act only to correct, delay or change the start	Apply online or with form ISP-3550
Common reasons	Long, continuous residence and records under one name	Arrival as an adult, years abroad, name changes
Says anything about eligibility?	Yes, enrolment is a decision	No, it is a request

Editorial comparison based on the Government of Canada’s OAS application page. The common reasons are typical examples, not an official list.

What if no letter comes

The official guidance is precise: if a month has passed since your 64th birthday and you have received nothing, contact Service Canada to find out whether you need to apply.¹ Letters go to the address on file, so a recent move is the most common reason one goes astray. Waiting for a letter that is not coming only delays the decision.

What the residence rules mean for the letter

Residence is the heart of the question. To receive OAS while living in Canada, you need at least 10 years of residence in Canada after age 18; to receive it while living abroad, at least 20.² A full pension is based on 40 years. With fewer, the pension is partial: years lived in Canada divided by 40.³

Worked example · illustrative

Years in Canada after 18	Share	Monthly at 65 to 74
40 or more	40/40	$762.50
30	30/40	$571.88
20	20/40	$381.25

Uses the maximum OAS pension for ages 65 to 74 for October to December 2026, $762.50. Amounts are adjusted quarterly and reduced by the recovery tax at higher incomes. Arithmetic only, not a quotation for any reader.

This is why the second letter is common for people who came to Canada later in life: Service Canada needs the dates. Having your arrival documents and any foreign addresses to hand makes the application faster. If part of your working life was in a country with which Canada has a social security agreement, that period may help you qualify; see what changes for CPP and OAS when you move abroad.

The decision to make before you file the letter

Whichever letter arrives, it is also the moment to decide when the pension should start. You can start at 65 or delay up to 70, and each month of delay raises the pension by 0.6%.⁴ The trade-offs, including the fact that the Guaranteed Income Supplement is not paid while OAS is deferred, are set out in what waiting to start OAS adds for each month you delay.

Important

A real enrolment letter does not ask you to reply by text or email with your Social Insurance Number or banking details. If a message about OAS does, treat it as suspect and read our letter on look-alike messages.

Who should check now

• Anyone aged 63 or 64: confirm that Service Canada has your current address.
• Anyone who arrived in Canada after 18 or lived abroad for long periods: gather the dates.
• Anyone a month past 64 with no letter: contact Service Canada.
• Anyone considering a later start: decide before the pension begins.

The takeaway

The two letters are not a verdict on you; they reflect the state of Service Canada’s file. The enrolment letter still needs checking, the invitation to apply needs an answer, and silence after the 64th birthday needs a phone call. Whichever arrives, keep it in the folder for as long as the pension is paid.

P.S. The next letter goes out on Tuesday. If it does not reach you yet, the reply card is below.