Can I get CPP retroactively? The 11-month back pay rule

The 11-month rule for CPP retroactive payments

You can get the CPP retirement pension retroactively only when you apply after your 65th birthday. In that case you can ask Service Canada for a start date as early as 11 months before the month it received your application. The start date can never be earlier than the month after you turned 65.

Both limits apply at once, and whichever gives the later month wins. Someone who applies at 70 and a half is capped by the 11 months. Someone who applies at 65 and a few months is capped by the month after their birthday.

Retroactivity is not automatic. You choose the start date on the application. If you do not ask for an earlier start date, you can give up months you were entitled to claim.

Can I get CPP back pay before 65?

No. If you apply at or before your 65th birthday, Service Canada's rule is simple: there is no retroactivity. A person who turned 62 last year and only now applies cannot be paid for the months since then.

Before 65, the lesson is to apply ahead of the month you want payments to begin. If you plan to take CPP at 60, submit the application a few months before your target month so nothing is lost while it is processed. Each month you start before 65 reduces the pension by 0.6%, up to 36% at age 60.

How far back can CPP be paid: a worked example

Take someone born in August 1960. They turned 65 in August 2025 but did not apply until Service Canada received their application in May 2026.

• The 11-month limit would allow a start as early as June 2025.
• The birthday limit allows nothing before September 2025, the month after they turned 65.
• The later of the two wins, so the earliest start date is September 2025.

Once approved, the months from September 2025 until regular deposits begin are paid as a lump sum. After that, the pension arrives on the normal CPP payment dates.

Should you take the back pay or a later start date

Back pay is not free money. Your pension grows by 0.7% for each month you start after 65, up to 42% at 70. Choosing a retroactive start date means starting at a younger age, so the monthly amount for life is smaller than if you started now.

In this example the backdated choice pays about $77 a month less for life. The $12,001 lump sum would take roughly 156 months, or 13 years, of that smaller payment to use up, which lands near age 80. People in poor health, or who need the cash now, often favour the lump sum. People expecting a long retirement may prefer the higher monthly amount.

Starting dates also interact with Old Age Security and the Guaranteed Income Supplement. Before choosing, read can I get CPP and OAS at the same time.

How CPP retroactive payments arrive

1. Apply online through My Service Canada Account or on paper, and enter the retroactive start date you want.
2. Service Canada reviews the application and sends a decision letter showing your start date and monthly amount.
3. The back months are paid to you as a lump sum.
4. Regular monthly payments follow on the CPP schedule. The remaining 2026 dates are October 28, November 26 and December 22; 2027 dates are not yet announced.
5. If you disagree with the start date in the decision, you must ask for a review in writing within 90 days of receiving the letter.

Check that your direct deposit details are right before the lump sum is sent. Our CPP direct deposit guide explains how to update them.

Tax on a CPP back pay lump sum

A retroactive lump sum is taxable, and no tax is withheld from it unless you have asked for deductions. It is reported in the year you receive it, in box 20 of that year's T4A(P), on line 11400.

If $300 or more of the lump sum relates to earlier years, the CRA will work out the tax as though those parts had been received in the years they belong to, whenever that gives you a lower bill. Keep the Service Canada letter that breaks the payment down by year and attach it if the breakdown is not on the slip. More on reporting is in is CPP taxable.