How RRSP Contributions Reduce Taxable Income
When you contribute to an RRSP, the amount comes off your taxable income for the year. If you earn $90,000 and contribute $10,000, your taxable income drops to $80,000. You pay tax as if you earned $80k instead of $90k.
The tax you "save" depends on your marginal tax rate — the rate on your highest dollars of income. In Ontario at $90k, your combined federal + provincial marginal rate is roughly 33.89%. So a $10,000 contribution saves you about $3,389 in tax.
What Your RRSP Refund Actually Means
If your employer deducted tax from every paycheque as though you earned $90k, but your actual taxable income is now $80k thanks to the RRSP, you overpaid tax during the year. The government sends the difference back to you when you file your return — that's your "RRSP refund."
Here's the thing most people miss: this is not free money. It's a tax deferral. You'll pay tax on every dollar when you eventually withdraw from the RRSP/RRIF. The strategy works because you get the deduction at a high rate now and pay tax at a lower rate later (in retirement).
Pro tip: The smartest thing you can do with your RRSP refund is reinvest it — either back into the RRSP (if you have room) or into a TFSA. Spending the refund is like taking a loan against your future self.
Using the SimRetire RRSP Refund Calculator
Our calculator takes your income and province, then shows you the exact refund for any contribution amount. It breaks down the federal and provincial portions and shows your effective vs marginal tax rates.
Example RRSP Refund Walkthrough
Let's say you live in Ontario and earn $85,000. You contribute $8,000 to your RRSP before the March 1 deadline.
That $2,372 refund, if invested in a TFSA at 7% for 20 years, grows to about $9,175 — completely tax-free. That's the power of reinvesting your refund instead of spending it.
Frequently Asked Questions
How much tax will I save with an RRSP contribution?
Your savings equal your contribution multiplied by your marginal tax rate. At a 40% rate, a $10,000 contribution saves you $4,000 in tax. Our calculator gives you the exact number for your province and income.
When is the RRSP contribution deadline?
The deadline for the 2025 tax year is March 1, 2026. Contributions made after that date count toward the following tax year.
Should I contribute to RRSP even with a low income?
If you're in a low bracket (under $55k in most provinces), a TFSA may be better. You get no deduction benefit from the RRSP at low rates, and TFSA withdrawals won't affect GIS or other benefits later. Consider carrying forward your RRSP room for higher-income years.
SimRetire Editorial Team
Canadian Retirement Experts
This guide has been rigorously reviewed by our editorial team to ensure 100% compliance with 2026 Canadian tax laws and CRA guidelines. Our mission is to provide accurate, independent, and accessible financial education for all Canadians.