There are two camps when it comes to the Canada Pension Plan (CPP), and they rarely agree.

The first camp says take it at 60. Enjoy the money while you are active, before health or circumstance gets in the way. The second camp says wait until 70, because deferring grows your monthly cheque by up to 42%, and that larger amount is paid for life.

Both camps are arguing about the size of the cheque. That is the wrong argument.

The real question is not "how big is my CPP cheque." It is "how much tax will I pay across my entire retirement, and how does CPP timing change that number." Viewed through a lifetime-tax lens, the decision often flips.

Here is why. Deferring CPP from 60 to 70 leaves you with 10 years of lower income. That low-income window is a rare chance to draw down your RRSP (Registered Retirement Savings Plan), or your RRIF (Registered Retirement Income Fund) once it converts, at lower tax brackets. That is the RRSP Meltdown. And the tax it saves can rival or beat the guaranteed deferral bump on its own.

How the CPP adjustment actually works

The mechanics are fixed and worth stating plainly:

• Take CPP before 65: it is reduced by 0.6% per month, or 7.2% per year, to a maximum reduction of 36% at age 60.
• Defer CPP after 65: it increases by 0.7% per month, or 8.4% per year, to a maximum increase of 42% at age 70 relative to the age-65 amount.

The 2026 maximum CPP at 65 is $1,507.65 per month. But very few people get the maximum. The average new CPP payment at 65 is only about $800 per month, because it reflects a lifetime of actual contributions against the year's earnings ceiling (the 2026 YMPE is $74,600). Most Canadians land somewhere in between.

So instead of modelling the headline maximum, let us model a realistic near-maximum earner: someone whose CPP at 65 would be about $1,400 per month. That assumption matters, and we will keep it visible throughout.

A worked example: Margaret, 60, with $850,000 in her RRSP

Consider Margaret, 60, recently retired in Ontario. Based on a strong contribution history, her CPP at 65 would be about $1,400 per month. She has $850,000 in her RRSP, roughly $95,000 in her TFSA (Tax-Free Savings Account), and a small defined benefit pension of about $9,000 per year. Her home is paid off.

Run her CPP two ways:

• At 60: a 36% reduction takes her CPP to about $896 per month, or roughly $10,750 per year, starting now.
• At 70: a 42% increase over the age-65 amount takes her CPP to about $1,988 per month, or roughly $23,850 per year, starting a decade later.

If Margaret only compares the two cheques, the break-even lands around 81 to 82 with no indexing, and closer to 84 once you factor in roughly 2% annual CPP indexing. A higher assumed investment return on an early CPP pushes that crossover later. That is the calculation most articles stop at.

But the cheque comparison ignores the most valuable thing about waiting: what Margaret does with her RRSP in the meantime.

The insight most articles miss: the low-income window

When Margaret defers CPP to 70, her taxable income from 60 to 69 is low. It is essentially just her $9,000 pension. That opens a 10-year runway to melt down her RRSP at low brackets, and the effects compound:

• She moves money out cheaply. She can withdraw from her RRSP or RRIF each year up to a chosen bracket ceiling, converting fully taxable registered money at roughly 20% to 30% instead of leaving it to be taxed later at higher rates.
• She shrinks her future RRIF minimums. RRIF minimum withdrawals are a required percentage that rises with age. A large balance forces large withdrawals whether she needs the money or not. Melting the balance down now keeps those future minimums smaller.
• She protects her OAS. Keeping future income lower helps keep her under the 2026 OAS (Old Age Security) clawback threshold of $95,323, above which OAS is recovered at 15 cents per dollar on a prior-year income basis.
• She reduces the tax in her final year. A RRIF is deemed fully received as income in a person's final year. A smaller registered balance then means less of it is taxed in that single high-income year, and more is available to leave behind.

In this modelled scenario, the lifetime tax saved by using that 10-year window can match or exceed the value of the 42% deferral bump on its own. The deferral makes the cheque bigger. The low-income window makes the entire plan cheaper. Stacked together, they reinforce each other.

Take CPP at 60 instead, and that ~$10,750 lands on top of her pension every year from 60 onward. It fills her lower brackets, leaving far less room to melt the RRSP down cheaply. The RRSP keeps compounding, the future RRIF minimums grow, and more of the balance gets taxed later at higher rates, or all at once in the final year.

What tips the decision each way

CPP timing is genuinely personal. Five factors move the answer, and each one pushes in a specific direction:

• Longevity and health. Good health and family longevity push toward waiting, because you are more likely to pass the break-even. A real health concern pushes toward taking it earlier, since you may not reach it.
• Other income and your marginal bracket. If lots of other income already fills your brackets in your 60s, the low-income window is narrow and the meltdown case for deferring weakens. If your 60s income is genuinely low, deferring is far more powerful.
• Expected investment return. A high assumed return favours taking CPP early and investing it, and pushes the break-even later. Lower returns favour deferring, because the 42% increase and the indexing are effectively guaranteed.
• OAS clawback interaction. If your projected income runs near or above the clawback threshold, deferring CPP while melting down the RRSP early can keep you under it. This pushes toward waiting.
• CPP survivor benefit. A surviving spouse's own CPP plus the survivor portion is capped at the individual maximum. If you already have a large CPP, a big deferred CPP may not fully pass to your spouse, which can weaken the case for maximum deferral in a couple.

Notice that no single factor decides it. The answer is the interaction of all five against your actual balances. That is exactly where a rule of thumb fails.

How Optiml models this for you

This is the kind of decision a break-even chart cannot answer, because the right CPP age depends on your RRSP balance, your other income, your bracket, your OAS exposure, and your spouse's situation all at once.

• Optiml's CPP & OAS Optimizer models the optimal start age across 60 to 70 for your complete picture, not a generic crossover chart.
• Every Optiml plan models the optimal withdrawal sequence across your accounts each year, so the low-income window created by deferring CPP is automatically used to draw your RRSP down at the lowest available brackets.
• With Compare Plans, you can put CPP-early and CPP-late side by side and see the lifetime-tax difference in dollars, not theory.

The Bottom Line

CPP timing is not really about the size of one cheque. It is about how that timing reshapes a decade of withdrawals, your future RRIF minimums, your OAS, and your tax bill in your final year. Deferring can pay you twice: a bigger cheque, and a cheaper decade to empty your RRSP.

So should you take CPP at 60 or wait until 70? Run your own numbers, not the average. You can try it free for 14 days and model both paths side by side.

The bigger cheque is only half the math.