How CPP and OAS Reduce Your FIRE Number

The Core Insight

CPP and OAS are part of your retirement income

When calculating your FIRE number, many people use the simple formula: Annual Expenses × 25. This assumes your portfolio funds 100% of your expenses forever. For Canadians, this is often a significant overestimate.

CPP and OAS are government-backed, inflation-indexed income streams that last your entire life. They reduce how much your portfolio needs to generate — permanently.

Corrected formula for Canadians:

Phase 2 FI Number = (Annual Expenses − CPP − OAS) ÷ Withdrawal Rate

Example: $72,000 expenses, $12,000 CPP, $9,600 OAS, 4% withdrawal rate
Phase 2 FI Number = ($72,000 − $21,600) ÷ 0.04 = $1,260,000
vs simple calculation: $72,000 ÷ 0.04 = $1,800,000

Difference: $540,000 less required

Current Benefit Amounts

What CPP and OAS actually pay

Benefit	Average (2026)	Maximum (2026)	Notes
CPP at 65	~$800/mo	$1,507.65/mo	Requires ~39 max-contribution years
CPP at 60	64% of age-65 amount	~$965/mo max	36% permanent reduction
CPP at 70	142% of age-65 amount	~$2,141/mo max	42% permanent increase
OAS at 65	$727.67/mo (full)	$727.67/mo	Requires 40 years Canadian residency after 18
OAS at 70	136% of age-65 amount	$989.63/mo	36% increase for delay (0.6%/month)
OAS at 75+	+10% permanent boost	$800.44/mo	Automatic — no application needed

Critical note for early retirees: The CPP maximum requires approximately 39 years of maximum contributions since age 18. If you retire at 45 with ~27 contribution years, your CPP will be roughly 45–55% of the maximum — approximately $680–$830/month at age 65, not $1,507. Using the full maximum in your plan when you've worked 25 years will significantly overstate your retirement income.

The CPP drops your 8 lowest-earning years automatically, which partially helps — but early retirement still meaningfully reduces your CPP. Always use your actual Service Canada estimate, not the maximum.

OAS is residency-based, not contribution-based. Unlike CPP, you don't need to have worked to receive OAS. However:

• Full OAS requires 40 years of residency in Canada after age 18
• Partial OAS available with as little as 10 years — prorated at years ÷ 40
• Living abroad requires at least 20 years of prior Canadian residency
• Payments are adjusted quarterly for CPI inflation
• Your partial percentage is locked in when you start — it doesn't increase later

Immigrants or those who spent significant time abroad should calculate their actual OAS entitlement carefully — it may be meaningfully below the maximum.

Get your personalized CPP estimate from your My Service Canada Account. For OAS, use the OAS estimator on Canada.ca.

The Two-Phase Model

Planning for two distinct retirement phases

For early retirees especially, retirement has two very different phases from a financial planning perspective:

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Phase 1 — The Bridge

From your FIRE date until CPP/OAS begin. Your portfolio funds 100% of expenses. This is the highest-risk period — sequence of returns matters most here.

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Phase 2 — With Benefits

Once CPP and OAS start, your portfolio only needs to fund the gap. The required withdrawal rate drops substantially — your portfolio lasts much longer.

Bridge years matter: If you retire at 50 and take CPP at 65, you have a 15-year bridge period where your portfolio is doing all the work. Shorter bridges (taking benefits earlier) reduce sequence-of-returns risk. Longer bridges (delaying benefits) increase monthly payments but stress the portfolio more during the vulnerable early years.

Impact Examples

Real numbers — CPP/OAS impact on portfolio size needed

Scenario	Annual Expenses	CPP + OAS	Portfolio Needed	Savings vs No Benefits
Average couple, 65 (full OAS both)	$80,000	~$33,700	$1,158,000	−$842,000
Single, avg CPP, 65	$55,000	$17,600	$937,500	−$440,000
Early retiree, 50, CPP at 65	$65,000	$20,000	$1,125,000	−$500,000
Max CPP/OAS couple, 65	$100,000	$48,000	$1,300,000	−$1,200,000

The impact is substantial. OAS amounts assume full 40-year Canadian residency. Immigrants or those with significant time abroad should calculate partial OAS using years of residency ÷ 40. Even a modest combined CPP and OAS of $20,000/year reduces your required portfolio by $500,000 at a 4% withdrawal rate. Note that the CPP amounts above assume full contribution history — early retirees should use their actual Service Canada projected amounts, which will typically be lower.

Related Guides

How CPP and OAS Reduce Your FIRE Number

CPP and OAS are part of your retirement income

What CPP and OAS actually pay

Planning for two distinct retirement phases

Phase 1 — The Bridge

Phase 2 — With Benefits

Real numbers — CPP/OAS impact on portfolio size needed

Calculate your two-phase Canadian FI Number

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