Taxes are not automatically withheld from CPP payments for Canadian residents. Canada Pension Plan benefits are fully taxable income, but Service Canada sends the full gross amount to your bank account each month and leaves the tax up to you. You can fix that by requesting voluntary withholding, or by making quarterly installment payments to the CRA. Non-residents are the exception: a flat 25% is withheld before the money leaves Canada, though a tax treaty may reduce that rate.
Why Nothing Comes Off by Default
CPP benefits are taxable income and must be included on your return for the year you receive them. Unlike a paycheque, where your employer calculates and remits tax every pay period, CPP arrives with nothing taken off unless you ask for it. The maximum monthly retirement benefit at age 65 reached $1,507.65 in 2026,1Canada.ca. Canada Pension Plan (2026) and Old Age Security (January to March) and every dollar of it counts toward your annual tax bill. New retirees who don’t plan for this often get an unwelcome surprise the first spring after they start collecting.
How to Set Up Voluntary Tax Withholding
The straightforward fix is to ask Service Canada to deduct income tax from each monthly payment before it reaches you. You can specify any dollar amount or any percentage of your gross payment; there are no fixed tiers.2Service Canada. Request for Voluntary Federal Income Tax Deductions – CPP/OAS A sensible starting point is your marginal tax rate, adjusted upward if other retirement income (workplace pension, RRIF withdrawals, OAS) pushes you into a higher bracket.
Two ways to make the request:
- Online through My Service Canada Account. Log in and select “Change my tax deductions.” The system displays your estimated gross amount, current withholding, and estimated net monthly payment, so you can see the effect of the change before you confirm it.3Canada.ca. Canada Pension Plan in MSCA
- On paper. Download the Request for Voluntary Federal Income Tax Deductions form from Service Canada, complete it with your SIN, current gross monthly payment, and the amount or percentage you want deducted, and mail it to your regional Service Canada office.2Service Canada. Request for Voluntary Federal Income Tax Deductions – CPP/OAS
Fixed amount or percentage? A percentage moves automatically with the annual inflation adjustment to CPP payments. A flat dollar amount stays put until you change it, which will leave you slightly under-withheld after each yearly increase. You can update the setting at any time through MSCA or by submitting a new form.3Canada.ca. Canada Pension Plan in MSCA
What Happens if You Don’t Withhold Enough
If your net tax owing exceeds $3,000 in 2026 ($1,800 in Quebec), and also exceeded that threshold in either 2025 or 2024, the CRA will require you to make quarterly installment payments instead of waiting until you file.4Canada Revenue Agency. Required Tax Instalments for Individuals The due dates are March 15, June 15, September 15, and December 15.
Missing an installment, or paying less than required, triggers interest. The CRA’s prescribed rate on overdue amounts for the first quarter of 2026 is 7%.5Canada Revenue Agency. Interest Rates for the First Calendar Quarter 2026 If your installment interest for the year passes $1,000, the CRA adds a penalty on top. Voluntary withholding sidesteps all of that: once it’s set, you don’t have to remember four dates a year.
If You Live Outside Canada
Non-residents don’t get a choice. Under Part XIII of the Income Tax Act, Canada withholds a mandatory 25% from CPP payments before they leave the country.6Canada Revenue Agency. Rates for Part XIII Tax A tax treaty between Canada and your country of residence may reduce that rate, and the reduction should be applied automatically based on where you live.
Instead of a T4A(P), you’ll get an NR4 slip each year showing the gross CPP paid and the total Part XIII tax withheld.7Canada Revenue Agency. NR4 Statement of Amounts Paid or Credited to Non-Residents of Canada
Fixing Excess Withholding
If Canada withheld more than your treaty rate allows, you have two forms to know. Form NR5, filed by October 31, asks the CRA to apply the lower rate going forward starting the next calendar year.8Canada Revenue Agency. Important Reminder if You Filed Form NR5 Filing an NR5 also commits you to filing a Canadian return under section 217 by June 30 of the following year; miss that and you owe the full 25% regardless of the treaty. Form NR7-R, Application for Refund of Part XIII Tax Withheld, is the route to recover tax that was already withheld in excess.9Canada Revenue Agency. NR7-R Application for Refund Part XIII Tax Withheld
US Residents: The 0% Rate
The Canada-US tax treaty classifies CPP as social security rather than a private pension. Under Article XVIII(5), CPP paid to a US resident is taxable only in the United States,10Canada.ca. Convention Between Canada and the United States of America – Article XVIII which means Canada should ultimately withhold nothing. In practice, Canada may still take the default 25% until you file the NR5 to get your treaty rate on record, so submitting it promptly saves you from chasing refunds through the NR7-R process later. Don’t confuse this with the 15% cap the treaty sets on Canadian withholding for periodic payments from other Canadian pensions such as employer plans or RRSPs;11Government of Canada. Convention Between Canada and the United States of America different income, different rate.
Closing the Loop at Tax Time
Each February, Service Canada issues a T4A(P), Statement of Canada Pension Plan Benefits, to every Canadian recipient. Box 20 shows your total taxable CPP for the year, and the slip also reports any federal income tax that was voluntarily deducted.12Canada Revenue Agency. T4A(P) Statement of Canada Pension Plan Benefits
On your T1, the amount from Box 20 goes on line 11400. Tax already withheld is claimed on line 43700, alongside withholdings from any other income source.13Canada Revenue Agency. Line 43700 – Total Income Tax Deducted The gap between your total tax liability and the amount on line 43700 determines whether you owe more or get a refund. Set your voluntary withholding close to your actual marginal rate and that gap stays small, which is the whole point.
A Note for QPP Recipients
If you contributed to the Quebec Pension Plan rather than CPP, the tax treatment is essentially the same: QPP benefits are taxable income reported on your return. One difference matters if you now live outside Canada: Retraite Québec does not allow you to request provincial income tax deductions on non-resident payments, and directs you to the federal government’s resources instead.14Retraite Québec. Request for Income Tax Deductions Quebec residents receive an RL-2 slip for provincial filing purposes.