To file for Canadian Social Security, you apply through Service Canada for two separate programs: the Canada Pension Plan (CPP) and Old Age Security (OAS). CPP is filed using form ISP-1000 or through My Service Canada Account. OAS uses form ISP-3550, but many people never file for it at all because Service Canada enrolls them automatically around their 64th birthday. Before you fill anything out, check your mail.
Check Whether You Need to Apply for OAS
OAS is often handled without any action on your part. If Service Canada already has your eligibility information on file, an enrollment letter arrives around your 64th birthday confirming you’re automatically enrolled. If a month has passed since your 64th birthday and no letter has come, contact Service Canada to find out whether you need to submit an application.
If you want to defer OAS past 65 for a higher monthly payment and you were automatically enrolled, you have to contact Service Canada to request the deferral before payments begin. Otherwise the payments will start on their own.
CPP is different. It never starts automatically. You have to apply for it, no matter how many years you contributed.
Basic Eligibility Before You File
For a CPP retirement pension you need to be at least 60 and have made at least one valid contribution to the plan. A valid contribution comes from employment or self-employment earnings in Canada, or from credits transferred from a former spouse or common-law partner after a relationship ended. If you worked in Quebec, you contributed to the Quebec Pension Plan instead of CPP; QPP is administered by Retraite Québec, and credits between the two plans are coordinated so nothing is lost.
For OAS, eligibility turns on age and residency rather than work history. If you live in Canada, you must be at least 65 and have resided in Canada for at least 10 years after turning 18. If you live outside Canada when you apply, the residency requirement is 20 years after age 18.
Standard start age is 65 for both programs, but CPP can begin as early as 60 or be delayed to 70, and OAS can be delayed to 70. Starting earlier or later changes the monthly amount permanently, so decide before you file.
Documents to Gather
Pull these together before you open a form:
- Your Social Insurance Number, and your spouse’s or common-law partner’s SIN. Service Canada uses both to coordinate benefits and tax obligations between households.
- Banking information for direct deposit: your branch number, institution number, and account number.
- Residency history with dates and addresses for everywhere you’ve lived. This matters especially for OAS, where the pension amount depends on years of Canadian residence after age 18.
- Work history for CPP, including any periods where you worked less because you were caring for young children, which can trigger a provision that protects your pension calculation.
The CPP form is the Application for a Canada Pension Plan Retirement Pension, ISP-1000. The OAS form is the Application for the Old Age Security Pension and the Guaranteed Income Supplement, ISP-3550. Both are on the Service Canada website and available at physical Service Canada offices. If you were automatically enrolled for OAS, skip the ISP-3550 entirely.
How to File CPP
Online Through My Service Canada Account
The fastest route is My Service Canada Account (MSCA). Register or sign in, then select the link to apply for CPP retirement pension from the Canada Pension Plan section. The portal walks you through entering your information and uses electronic authentication to verify your identity. Before you submit, check that every field matches your official identification exactly. Online CPP applications are typically decided within 28 days.
By Mail or In Person
If you prefer paper, complete the ISP-1000 and either mail it to the Service Canada processing centre for your region or drop it off at a local Service Canada office. Signatures must be original and every page has to be there. Paper applications take much longer to process, with decisions typically arriving within 120 days.
Either way, the formal filing date is the date Service Canada receives your application, and that date determines any retroactive payment you might be owed.
How to File OAS
If Service Canada told you to apply, use the ISP-3550. You can file online through MSCA if you have an account, or submit the paper form by mail or in person at a Service Canada office. The same documents apply, with particular attention to your residency history, which is what your OAS calculation is built on.
If you want to defer, either mark that intention on your application or, if you were automatically enrolled, contact Service Canada before payments start. Deferral is a choice you make at filing, not later.
One boundary worth knowing before you file: if your income in retirement is high, part or all of your OAS is recovered through the OAS recovery tax on your Canadian income tax return. If your income is low, you may qualify for the Guaranteed Income Supplement on top of OAS. Neither changes how you file the initial application, but both change what you ultimately keep.
After You File
Service Canada sends the decision by mail or as a status update in your MSCA portal. Once approved, the first payment lands in the bank account you provided. Watch for the letter or check the portal; if something was missing, this is where you’ll find out.
The Old Age Security Act gives the Minister authority to impose financial penalties on anyone who knowingly makes false or misleading statements in an application, fails to report income, or receives payments they know they aren’t entitled to. CPP has similar provisions. These penalties are on top of any requirement to repay benefits you weren’t owed, so answer every question accurately.
Filing From the United States
If you split your career between the United States and Canada, the US-Canada Social Security Agreement lets you combine credits from both countries to meet eligibility thresholds you couldn’t meet alone.
- For OAS, Canada will count your US Social Security credits earned after 1951 and after age 18 alongside your Canadian residency to help you meet the OAS residency requirement. You still need at least one year of Canadian residence after 1951 and after age 18 to use the provision.
- For CPP retirement, you generally don’t need to invoke the agreement at all, because anyone with even one valid CPP contribution qualifies. The agreement matters more for CPP disability and survivor benefits.
- Canadian work credits can also help you qualify for US Social Security if your US credits alone aren’t enough.
When credits from both countries are combined to establish eligibility, each country pays only the portion tied to the credits earned under its own system. You don’t get double credit for the same work.
To receive payments in the United States, sign up for foreign direct deposit. Complete the foreign direct deposit enrollment form with your personal information, banking details, and payment file numbers, then mail the signed form to the address specified by Public Services and Procurement Canada. Confirm the United States is on the list of available countries before you start, though it is one of the countries the program covers.
For US tax purposes, CPP and OAS paid to a US resident are taxed only by the United States under the US-Canada income tax treaty, and Canada does not withhold. You report them on Form 1040 lines 6a and 6b, the same lines used for US Social Security.