RRSP or TFSA? Most articles tell you it depends on your income. They're half-right. The real answer depends on TWO numbers: your marginal tax rate NOW vs your marginal tax rate IN RETIREMENT. Get those right and the optimal choice becomes mathematically obvious. Below: 3 calculators that prove it.
How this is modeled: Your contribution is treated as after-tax dollars committed to the strategy. The TFSA gets that amount directly. The RRSP's refund is handled per your choice — into next year's RRSP grosses up the effective contribution; into TFSA grows tax-free; into unregistered applies ~15% annual tax drag + capital-gains tax at retirement. All growth otherwise tax-sheltered.
YOUR RESULTS
TFSA STRATEGY
$606,438
tax-free withdrawal
RRSP STRATEGY
$744,749
after-tax withdrawal
($1,063,927 RRSP pre-tax)
★ RRSP WINSby $138,311
━ TFSA━ RRSP (after tax)┄ RRSP (pre-tax)
★ THE ONE RULE TO REMEMBER
If retirement marginal rate < today's — RRSP wins.
The mathematical truth is brutally simple: RRSP wins if your marginal tax rate IN RETIREMENT is lower than your marginal tax rate TODAY. TFSA wins if the opposite is true. Equal rates = mathematical tie (TFSA wins on flexibility).
RRSP WINS
43% today ↓ 30% retirement
Tax arbitrage: 13% saved per dollar
MATHEMATICAL TIE
43% today ↓ 43% retirement
Choose TFSA (flexibility wins)
TFSA WINS
30% today ↓ 43% retirement
Future tax higher than current
★ THE 5-QUESTION QUIZ ★
Personalized recommendation
Q1. Your current taxable income is:
Q2. In retirement you expect to earn:
Q3. Buying your first home in 5 years?
Q4. Does your employer match RRSP contributions?
Q5. When do you need this money?
Answer all 5 questions to see your recommendation.
★ FEATURE-BY-FEATURE ★
The full comparison
FEATURE
RRSP
TFSA
2026 Annual limit
$33,330
$7,500
Cumulative room since inception
18% of earned income
$103,500
Contributions tax-deductible?
Yes ✓
No ✗
Growth taxed?
No (deferred) ✓
No (tax-free) ✓
Withdrawals taxed?
Yes — full income ✗
No ✓
Withdrawals restore room?
No ✗
Yes (next year) ✓
Foreign withholding tax on US div?
Refundable (0%) ✓
15% withheld ✗
Home Buyer's Plan (HBP)
Up to $60K ✓
n/a ✗
First Home Savings (FHSA) transfer?
Yes ✓
No direct ✗
Must convert by age 71
Yes → RRIF ✗
Never ✓
Counts toward GIS clawback?
Yes (income) ✗
No ✓
Counts toward OAS clawback?
Yes (income) ✗
No ✓
Employer matching?
Often available ✓
Rare ✗
Best for
High earners now, retired in lower bracket
Low earners, flexibility, retirees
★ 3 REAL EXAMPLES ★
Each illustrates a different rule
CASE 1 · RRSP WINS
Maya — Software Engineer, $140K
Today: 45% marginal rate (top Ontario). Retirement plan: $60K/yr withdrawals = 30% marginal. RRSP wins by ~$78K on $10K/yr for 30 years.
CASE 2 · TFSA WINS
Liam — Grad Student, $32K → $130K career
Today: 20% marginal rate (student). Retirement plan: $80K/yr from successful career = 40% marginal. TFSA wins decisively.
CASE 3 · TIE / USE BOTH
Sarah — Teacher, $75K + DB pension
Today: 30% marginal rate. Retirement plan: Pension + savings = 30% marginal. Math is tied. TFSA wins on flexibility — use both.