Form ISP-3550 Old Age Security (OAS) Pension Application (2026): Edit Online Free & Download PDF
Old Age Security (OAS) Pension Application: Application for the Old Age Security Pension and the Guaranteed Income Supplement
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Form ISP-3550 in short
Form ISP3550 is the paper application for the Old Age Security (OAS) pension and the Guaranteed Income Supplement (GIS). Many people are enrolled automatically and get a letter around age 64, so this form is for those who did not get a letter, were asked to apply, or want to choose or delay their start date. You can also apply online through My Service Canada Account.
| Issued by | Service Canada, for Employment and Social Development Canada (ESDC) |
|---|---|
| Current version | SC ISP-3550 (2026-10-01) E (checked 2026-10-25) |
| Who fills it in | A person aged 65 or over (or about to turn 65) who meets the legal status and residence rules and was not enrolled automatically. The form says you need at least 10 years of residence in Canada since age 18 if you live in Canada, or 20 years if you live outside Canada, unless a social security agreement helps you qualify. |
| Who receives it | Service Canada, which delivers the OAS program for Employment and Social Development Canada. |
| Where to send it | Mail it to the nearest Service Canada office in the address list on the last page of the form. From outside Canada, send it to the office in the province where you last lived. Canada.ca says applicants outside Canada must use the paper application. |
| Deadline | No fixed deadline. The form says the earliest you can apply is 11 months before the date you want the pension to start. The pension can start as early as the month after your 65th birthday. |
| Fee | No fee. |
| Official links | Official page · Official PDF · Official instructions |
What changed
The current edition is dated 2026-10-01, as printed on every form page (SC ISP-3550 (2026-10-01) E). Question D2 asks non-residents whether their net world income for 2025 is more than $93,454.
How to fill out Form ISP-3550, line by line
| Section A | Personal information Social Insurance Number, preferred language, name, date of birth, last name at birth if different, home and mailing address, phone numbers and an optional email address. |
| Section B1 | OAS pension start date Choose as soon as you are eligible, or a specific month (YYYY-MM). Delaying up to age 70 can raise the monthly amount by 0.6% for each month (7.2% a year), but you cannot get the GIS while you delay. |
| Section B2 and B3 | Legal status and sponsorship Your status in Canada, or your status before you left if you live abroad, such as citizen, permanent resident or Status Indian. The form says you must provide documents to prove legal status. If you were sponsored, give your IRCC UCI number and sponsorship details. |
| Section B4 to B7 | Residence history If born outside Canada, the date you first entered and your immigration document. If you have not always lived in Canada since 18, list every country you lived in, with dates and any foreign insurance number. Leave out absences shorter than six months. Explain absences that may count as residence, such as military or diplomatic service. |
| Section C | Guaranteed Income Supplement Answer C2 to C11 to apply for the GIS, or tick C1 to skip it. Questions cover recent or expected retirement, reduced pension income, foreign income, marital status and your spouse or common-law partner's details. |
| Section D | Payment information and tax Bank branch, institution and account number for direct deposit, or attach a void cheque. Non-residents answer the 2025 world income question. Canadian residents can ask for income tax to be deducted as a dollar amount or a percentage. |
| Section E | Benefits from other countries Information only. If you lived or worked in another country you may be able to get a benefit from it. |
| Section F | Declaration and signatures You sign and date. Your spouse or common-law partner signs F2 only if you are applying for the GIS. A witness or authorized person completes F3 if someone signed with a mark or is signing on your behalf. |
Common mistakes to avoid
- Applying on paper when you were already enrolled automatically. Canada.ca says most people get an enrollment letter and do not need to apply.
- Applying too early. The form says the earliest you can apply is 11 months before your chosen start date.
- Not including proof of legal status. The form says you must provide documents, and canada.ca says to include certified true copies.
- Delaying OAS without knowing the GIS effect. The form says you cannot get the GIS while you delay, and the GIS does not increase.
- Leaving out foreign income in Section C. The form says you must report all world income, even if it is not fully taxable in Canada.
- Forgetting the spouse or common-law partner's signature in F2 when applying for the GIS.
- Signing on someone's behalf without proof of authority, such as a power of attorney or trusteeship authorization.
Questions about Form ISP-3550
Do I need to apply for Old Age Security?
Many people do not. Canada.ca says if Service Canada has your information you will get an enrollment letter around your 64th birthday. If one month has passed since your 64th birthday with no letter, contact Service Canada to find out if you need to apply.
Can I apply for OAS online?
Yes, through My Service Canada Account, if you are at least one month past your 64th birthday, not already receiving OAS, and do not have a third party managing your account. Applicants outside Canada must use the paper form.
How much more do I get if I delay OAS?
The form says the pension may increase by 0.6% for each month you delay after 65, up to age 70, which is 7.2% a year and 36% at 70.
Does this form also apply for the GIS?
Yes. Section C is the GIS application. If you do not want to apply for the GIS, tick the box in C1 and go to Section D.
How many years in Canada do I need for OAS?
The form says at least 10 years since age 18 if you live in Canada, or 20 years if you live outside Canada. A social security agreement may help if you lived or worked in another country.
Where do I mail the ISP3550?
To the nearest Service Canada office on the address list at the end of the form. From outside Canada, use the office in the province where you last lived.
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Sources
Checked against the official sources on 2026-10-25. PDF Editor Hub is not affiliated with the Service Canada, for Employment and Social Development Canada or any government agency. This page is general information, not legal or tax advice.