How an RRSP saves tax: refunds, deferral and the TFSA comparison
An RRSP saves tax in two ways: the deduction cuts your tax at your current marginal rate, and the money then grows without yearly tax. You pay tax when you withdraw, so the real gain depends on your tax rate now compared with your rate later.
The refund at your marginal rate
Your marginal tax rate is the combined federal and provincial rate on your last dollar of income. An RRSP deduction comes off the top of your income, so it saves tax at that rate.
Example. You earn a salary and your marginal rate is 30%. You contribute $5,000 and deduct it.
- Taxable income falls by $5,000.
- Tax saved: $5,000 × 30% = $1,500.
- Your actual cost: $5,000 − $1,500 = $3,500.
The saving usually arrives as a refund after you file, or as a smaller balance owing. Marginal rates vary by province and by income, and they change over time, so use your own rate rather than the 30% in this example. Your rate is the same whether you call the result a “refund” or not: a refund only means you paid too much tax during the year.
Reinvest the refund. The arithmetic below assumes you invest the tax saving. If you spend it, much of the RRSP’s advantage over a TFSA disappears.
Tax-deferred compounding
Inside an RRSP, interest, dividends and capital gains are not taxed each year. Nothing is lost to tax along the way, so the full balance keeps earning.
Example. $5,000 earning 5% a year, left for 30 years, grows to about $21,610 ($5,000 multiplied by 1.05 thirty times). In a taxable account, yearly tax on interest would lower the growth rate and the final amount. See Compounding for how growth builds over time.
Withdrawals are taxed
Every dollar you take out of an RRSP (or later a RRIF) is added to your income for that year and taxed at your rate then. The bank withholds some tax up front (10%, 20% or 30% outside Quebec, depending on the amount), but that is only a prepayment; the final tax is settled on your return. Room used by a regular withdrawal does not come back.
So an RRSP is a deferral: you trade tax at today’s rate for tax at tomorrow’s rate. If tomorrow’s rate is lower, you come out ahead.
RRSP vs TFSA: a simple test
Take $1,000 of salary before tax, a 30% rate now, and an investment that doubles before you withdraw it.
- RRSP: you contribute the full $1,000 (the refund covers the tax). It grows to $2,000. You withdraw it at your future rate.
- TFSA: you pay $300 tax first and contribute $700. It grows to $1,400. You withdraw it tax-free.
| Tax rate when you withdraw | RRSP after tax | TFSA after tax |
|---|---|---|
| 20% (lower than now) | $1,600 | $1,400 |
| 30% (same as now) | $1,400 | $1,400 |
| 40% (higher than now) | $1,200 | $1,400 |
The rule of thumb: if your rate will be lower in retirement, the RRSP wins; if it will be the same, they tie; if it will be higher, the TFSA wins.
Key differences at a glance
| Feature | RRSP | TFSA |
|---|---|---|
| Contributions | Deductible | Not deductible |
| Growth | Tax-deferred | Tax-free |
| Withdrawals | Taxable income | Generally tax-free |
| New room for 2026 | 18% of 2025 earned income, up to $33,810, less pension adjustment | $7,000 for adults, whatever their income |
| Room after a withdrawal | Lost (except Home Buyers’ Plan and Lifelong Learning Plan repayments) | Added back on January 1 of the next year |
| Federal income-tested benefits | Withdrawals count as income | Income and withdrawals do not affect them |
| Over-contribution tax | 1% a month on the excess over $2,000 | 1% a month on the excess |
When an RRSP is a poor choice
- Your income is low now
- If your marginal rate is low or zero, the deduction saves little. You can contribute now and save the deduction for a higher-income year, but a TFSA is often simpler.
- You expect a higher income later
- Students, people starting a career or anyone expecting a big jump in income may pay more tax on withdrawal than they saved going in.
- You may rely on income-tested benefits
- The Guaranteed Income Supplement (GIS) is for Old Age Security (OAS) pensioners with low income, and eligibility is based on income. RRSP and RRIF withdrawals are taxable income, so they can reduce benefits like GIS. TFSA withdrawals do not affect federal income-tested benefits and credits.
- Your retirement income will be high
- For the 2026 income year, OAS recipients repay 15% of net income above $95,323 through the OAS recovery tax (often called the clawback). Large RRSP or RRIF withdrawals can push income over that line.
- You need the money soon
- Early withdrawals are taxed and the room is lost, unless you use the Home Buyers’ Plan or Lifelong Learning Plan.
These rules interact with your whole financial picture. A fee-only planner or tax professional can run the numbers for your situation; see Choosing an advisor for how to check someone is registered.
Sources
- Registered Retirement Savings Plan (RRSP), Canada Revenue Agency
- Tax rates on withdrawals, Canada Revenue Agency
- MP, DB, RRSP, DPSP, ALDA, TFSA limits, YMPE and the YAMPE, Canada Revenue Agency
- What is a TFSA, Canada Revenue Agency
- Calculate your TFSA contribution room, Canada Revenue Agency
- Withdrawing from a TFSA, Canada Revenue Agency
- Excess contributions, Canada Revenue Agency
- Guaranteed Income Supplement: Overview, Government of Canada
- Old Age Security pension recovery tax, Government of Canada