The tax bill that surprises people in their first year of CPP

For forty years, tax came off the top. It was deducted from every pay cheque before the money reached the bank, by an employer who handled the arithmetic. Then the pension starts, and that arrangement quietly ends — without anybody announcing it.

The result is the most predictable unpleasant surprise in Canadian retirement: a balance owing on a return in the first spring after retiring, from somebody who has never owed tax at filing in their life.

CPP is taxable income

Start with the part that is not in dispute. A Canada Pension Plan retirement pension is taxable income. So is a CPP disability benefit, and so is a survivor’s pension. They go on the return, they are added to everything else, and tax is calculated on the total.

The Guaranteed Income Supplement is the exception on this page — it is not taxable. Old Age Security is.

Nothing comes off unless you ask

Here is the mechanism that does the damage. Service Canada does not withhold income tax from CPP payments by default. The deduction is voluntary and must be requested. Absent a request, the full gross benefit is deposited, and the tax on it remains entirely unpaid until the return is filed.

That is not an oversight in the system; it is deliberate, because a great many recipients have low enough total income that little or no tax is due. For anyone with other income, though, it means the money arriving each month is pre-tax money that feels like after-tax money.

Why it catches people out

Three things combine.

The deposit looks like net pay. It arrives monthly, it is a round-ish figure, and it goes into the same account the salary used to. Nothing about it signals that a liability is accruing behind it.

Retirement income usually arrives in pieces. CPP from Service Canada, OAS from Service Canada, perhaps a workplace pension from a former employer, perhaps a RRIF withdrawal from a bank. Each payer only knows about its own slice. None of them can calculate tax on a total that none of them can see.

The first year is the worst year for it. Someone who retires mid-year has several months of employment income, with tax properly withheld, plus several months of pension income with none. The two together can push the year into a higher bracket than either would alone.

Asking for deductions — and roughly how much

You can ask Service Canada to deduct federal income tax from your CPP payments, either as a percentage or as a fixed dollar amount each month. The request can be made through My Service Canada Account or on the paper form Service Canada provides for the purpose, and it can be changed later.

How much to ask for is the real question, and the honest answer is that it depends on your total income, your province and your credits. But the arithmetic of setting something aside is simple enough to see:

What a voluntary deduction sets aside

Illustrative CPP, $900 a month$10,800 a year

Illustrative OAS, $750 a month$9,000 a year

Gross from the two combined$19,800

Held back by a 10% voluntary deduction$1,980

Illustrative arithmetic on round figures, not a tax calculation and not a recommendation of any rate. Whether $1,980 is too much, too little or about right depends entirely on your total income, province and credits. If too much is withheld it comes back as a refund; the point of withholding is to avoid a lump sum due in April.

Two general principles are safe to state. Withholding something is almost always more comfortable than withholding nothing, because an over-deduction returns as a refund while an under-deduction becomes a bill. And the figure is worth revisiting in the first year after any change — starting OAS, starting a RRIF, selling a property, stopping work.

OAS works the same way

Old Age Security follows the identical pattern: taxable, with no tax withheld unless requested. Since CPP and OAS are paid on the same dates and often arrive as one deposit, it is easy to set up a deduction on one and assume both are covered. They are separate requests.

OAS has a further complication that CPP does not. Above a set income it is partly recovered through the OAS recovery tax, which is a different mechanism from ordinary withholding and operates on a different timetable.

The instalment letter

If a sizeable balance is owing at filing, and particularly if it happens in more than one year, the Canada Revenue Agency may ask for quarterly instalment payments rather than a single annual settlement. The letter arrives unprompted and tends to be read as a penalty. It is not — it is a schedule, and arranging adequate withholding at source is generally the simpler way to avoid needing it.

Finding your slips

Early each year, recipients receive a T4A(P) for CPP and a T4A(OAS) for Old Age Security, showing the amount paid during the previous year and any tax deducted. Residents outside Canada get NR4 slips instead.

Both are available in My Service Canada Account, where you can also change how they are delivered, and they feed into the CRA’s Auto-fill service for anyone filing electronically. Checking the “tax deducted” box on those slips takes ten seconds and tells you immediately whether you have a withholding arrangement in place or not.

The ten-minute job

Sign in, look at last year’s slips, see whether anything was deducted, and if the answer is nothing and you have other income, set a voluntary deduction. It is a single short task, it is free, and it converts an April problem into twelve small ones you will not notice.

Candy On Bone is published by SPV Consulting Estonia OÜ and provides general information about Canadian public pensions and taxes. It is not a Government of Canada, Service Canada or Canada Revenue Agency publication and has no affiliation with them. Nothing here is financial, tax or legal advice, and no figure in this article is a promise, quotation or entitlement for any individual reader. Benefit amounts and tax rules depend on personal circumstances and change over time; the figures cited were taken from the official sources listed above on 19 October 2026. There is no application, registration or fee on this website for any government benefit. Never give your Social Insurance Number, banking details or government account credentials to a website in response to an article. Use My Service Canada Account or contact Service Canada for anything concerning your own payments.