CPP Credit Split After Divorce in Ontario

Every year you work in Canada, you earn Canada Pension Plan credits tied to your income. When a marriage or common-law relationship ends, those credits earned during the time you lived together can be split equally between both spouses — and in Ontario, you cannot waive this right.

Here is how the CPP credit split works, what forms you need, and the deadlines that matter.

What Gets Split

The CPP credit split divides the pensionable earnings credits accumulated by both spouses during the period of cohabitation. This includes credits from employment income, self-employment income, and any CPP contributions made during that time.

Only credits earned while you were living together are divided. Credits earned before you moved in together or after you separated are not affected.

The split is 50/50 — half of each spouse's credits for the shared period are transferred to the other.

Is the Split Mandatory in Ontario?

Yes. Ontario is one of the provinces where the CPP credit split is mandatory once either spouse applies. Your separation agreement cannot waive this right, and neither spouse can opt out.

This is different from provinces like British Columbia and Alberta, where couples can agree to exclude CPP credits from division.

How to Apply: Form ISP1901

File the Application for a Division of Unadjusted Pensionable Earnings (Form ISP1901) with Service Canada. Either spouse can apply — you do not need your ex-spouse's cooperation.

You will need:

• Your Social Insurance Number (SIN) and your ex-spouse's SIN
• The date you began living together and the date of separation
• A certified copy of your Divorce Order or Certificate of Divorce (for married spouses)
• Proof of common-law relationship (for common-law partners)

Submit the form by mail to the nearest Service Canada centre. There is no fee.

Deadlines: Married vs. Common-Law

This deadline difference is critical for common-law couples. If you miss the 48-month window, you lose the right to split CPP credits permanently.

For married couples, there is no rush — but filing promptly means the adjustment appears on your next CPP Statement of Contributions, and you can plan your retirement income accordingly.

How the Split Affects Your Pension

The impact depends on each spouse's relative earnings during the marriage:

• If you earned more than your spouse, your CPP retirement pension will decrease
• If you earned less, your CPP retirement pension will increase
• If both earned roughly the same, the split has minimal effect

The split applies to all CPP benefits calculated from the shared credits, including retirement pension, disability benefits, and survivor benefits.

Service Canada will send both spouses a notice confirming the credit adjustment once the application is processed.

CPP Credits vs. Private Pension Division

CPP credit splitting is a separate process from dividing a workplace pension (OMERS, OPTrust, HOOPP, Ontario Teachers'). Private pensions are divided through the FSRA Form FL-1 valuation process under Ontario's Pension Benefits Act.

You need to complete both if your spouse has a workplace pension:

1. CPP credit split — through Service Canada (Form ISP1901)
2. Private pension division — through the pension plan administrator (FSRA forms)

Common Mistakes

Assuming the separation agreement covers it. Your agreement might mention CPP credits, but the split only happens when someone files Form ISP1901 with Service Canada. The agreement itself does not trigger the division.

Missing the common-law deadline. The 48-month window from separation is strict. Service Canada will reject late applications.

Not checking your Statement of Contributions. After the split is processed, review your updated CPP Statement of Contributions through your My Service Canada Account to confirm the adjustment is correct.

CPP credit splitting is one piece of the post-divorce financial puzzle. The Ontario After-Divorce Checklist covers the full sequence — from pension division and RRSP transfers to beneficiary updates and CRA notifications.

See more Ontario guides →