The RRSP Explained: How the Deduction Works, How Much Room You Have, and When It Makes Sense

Most Canadians know they should contribute to an RRSP, and a lot of them do it every February without being sure why. Understanding what it actually does makes the difference between using it well and simply having it.

How the Deduction Works

When you contribute, the amount comes off your taxable income, and you get a refund if tax was already withheld. At a 30% marginal rate, a $10,000 contribution saves about $3,000 in tax. That refund is not a bonus. It is the government’s share of an account that will be taxed later, so the best use of a refund is to invest it too.

How Much Room You Have

Each year you earn new room equal to 18% of the previous year’s earned income, up to a maximum that is set annually. For 2026 the maximum is $33,810. If you belong to a pension plan, your room is reduced by your pension adjustment, which is shown on your T4. Unused room carries forward, so many people have more than they think.

Your exact figure is on your last Notice of Assessment and in your CRA My Account. There is a $2,000 cushion for over-contributions, after which the penalty is 1% a month on the excess.

Contributing Is Not the Same as Deducting

You can contribute this year and claim the deduction in a later year. That matters if your income is low now and you expect it to be higher soon. A contribution made at a 20% rate gets a bigger refund when claimed against a year taxed at 36%, so there is no rush to use the deduction in the year you contribute.

Spousal RRSPs

If your spouse will have a lower retirement income than you, you can contribute to an RRSP in their name and take the deduction yourself. In retirement the income is taxed in their hands, which can reduce your household tax. The catch is the three-year rule: if they withdraw money that you contributed in the current or previous two calendar years, it is taxed back to you. This works best as a long-term plan, not a quick fix.

Taking Money Out

Withdrawals are fully taxable as income in the year you take them, and your financial institution withholds tax at source: 10% on withdrawals up to $5,000, 20% from $5,001 to $15,000, and 30% above that, outside Quebec. That withholding is only a down payment on your actual tax. It can fall well short if you are in a higher bracket.

The room you used is gone for good. Unlike a TFSA, you cannot put the money back. The exceptions are two programs that let you borrow from your own RRSP: the Home Buyers’ Plan, up to $60,000 for a first home, and the Lifelong Learning Plan. Both must be repaid.

When an RRSP Is Not the Best Choice

• Low income today. A deduction at a low rate saves little. A TFSA may serve you better, or you can contribute now and claim the deduction in a higher-income year.
• Expecting a high income in retirement. A large pension plus a big RRSP can mean forced withdrawals taxed at a higher rate than your deduction ever saved. That is the situation for many Alberta engineers and oil patch professionals with defined benefit pensions.
• Needing the money before retirement. The tax on withdrawal and the lost room make it a poor emergency fund.

The Part People Forget: What Happens at Death

An RRSP is not a tax-free account when you die. Unless it passes to a spouse, the whole balance is added to your final tax return as income. On a large RRSP that can be a tax bill of tens of thousands of dollars. Naming your spouse as beneficiary defers the tax, and for single people and widowed people the account is worth planning around well before it becomes an estate problem.

Where to Start

Check your room, your marginal rate, and whether the deduction is better used now or later. If you are within ten years of retiring, the bigger question is not how much to contribute but how you will take the money out, which is where most of the tax is won or lost.