The Allowance for the Survivor is a monthly payment you can get if:

• you are age 60 to 64
• you live in Canada
• your spouse or common-law partner has died and since their death you have not remarried or become a common-law partner to another person
• your annual income is less than $25,272

Why you may have to apply

You will have to apply if your spouse or common-law partner has passed away.

When to apply

You should apply after the death of your spouse or common-law partner and if you are between the age of 60 and 64. Do not apply earlier than 11 months before you turn 60.

When payments start

The Allowance for the Survivor payments will begin during one of the following months, whichever is latest:

• the month after the death of your spouse or common-law partner
• up to 11 months before the date we received or waived your application (if you applied after you turn 60)
• the month after you meet the eligibility requirements
• the month you turn 60

Allowance for the Survivor pension amount

Your income will determine how much you could receive.

 

source: https://www.canada.ca/en/services/benefits/publicpensions/cpp/old-age-security/guaranteed-income-supplement/allowance-survivor.html