An RRSP tax deduction works by letting you subtract the money you put into a Registered Retirement Savings Plan from your income for the year, so you pay tax on a smaller number. The savings equal your contribution multiplied by your marginal tax rate, which is why an RRSP contribution made while you’re working is usually worth more than the tax you’ll eventually pay when you withdraw the money in retirement. To get the benefit, you need to stay inside your contribution room, contribute by the annual deadline, and report the amount on the right line of your return.
How the Deduction Actually Lowers Your Tax
The deduction comes off your total income before federal and provincial tax are calculated. If you earn $90,000 and contribute $12,000, the Canada Revenue Agency treats your income as $78,000 for tax purposes. That can pull part of your earnings out of a higher bracket entirely, not just reduce the amount taxed at the top rate.
Because your employer already withheld tax on your full salary through the year, the deduction typically shows up as a refund when you file. The size depends on your marginal rate. Someone in a combined 30% bracket who contributes $10,000 saves roughly $3,000 in tax. Reinvesting that refund into next year’s RRSP is a common way to compound the benefit.
The design assumes you deduct at a high rate now and withdraw later at a lower one. If retirement income turns out to be higher than working income, the math still works, but the gap narrows.
How Much You Can Deduct
Your deduction limit for a year is the lesser of two figures: 18% of your previous year’s earned income, or the annual dollar cap the CRA sets. The cap is $32,490 for the 2025 tax year and $33,810 for 2026.1Canada Revenue Agency. MP, DB, RRSP, DPSP, ALDA, TFSA Limits, YMPE and the YAMPE If you belong to an employer pension plan, a Pension Adjustment reduces the room available to you, because the workplace plan is already building retirement benefits on your behalf.2Canada Revenue Agency. How Contributions Affect Your RRSP Deduction Limit
Don’t estimate. Check the exact figure on your most recent Notice of Assessment or through CRA My Account. Both include any unused room carried forward from earlier years, so the number you see is what you can actually deduct.
The $2,000 Cushion and What Happens Beyond It
The CRA tolerates a lifetime over-contribution of up to $2,000 without penalty, provided you were at least 18 at some point in the prior year.3Canada Revenue Agency. What Happens if You Go Over Your RRSP, PRPP or SPP Deduction Limit Cross that line and the tax is 1% per month on the excess, for every month the extra amount sits in the plan.2Canada Revenue Agency. How Contributions Affect Your RRSP Deduction Limit
If you go over, withdraw the excess quickly and file a T1-OVP return within 90 days after the end of the calendar year the excess existed. Filing late adds 5% of the balance owing plus 1% for each further month, up to 12 months.3Canada Revenue Agency. What Happens if You Go Over Your RRSP, PRPP or SPP Deduction Limit
The 60-Day Deadline
Contributions count against a given tax year if they’re made in that calendar year or during the first 60 days of the following one. For the 2025 tax year, that final date is March 2, 2026.4Canada Revenue Agency. Important Dates for RRSPs, HBP, LLP, FHSAs and More Contributions made in that January–February window can be applied to either the prior year or the current one, so you can put them where the deduction is worth more. When the 60th day falls on a weekend, the deadline shifts to the next business day.5Canada Revenue Agency. 5000-S7 Schedule 7 – RRSP, PRPP, and SPP Contributions and Transfers, and HBP and LLP Activities
Miss the deadline and the money isn’t wasted. It simply gets deducted in the current year or a later one instead.
Unused Room vs. Undeducted Contributions
Two things can build up over time, and they aren’t the same.
Unused room is contribution space you never filled. It carries forward indefinitely and stacks on top of new room in future years.6Canada Revenue Agency. RRSPs and Other Registered Plans for Retirement Someone with $15,000 of accumulated unused room can make a much larger contribution than the current year’s cap alone would allow, which is useful for catching up after lower-earning years.
Undeducted contributions are different: the money is already in the plan, but you chose not to claim the deduction yet. You might do this if you expect to be in a higher bracket next year. The contribution grows tax-sheltered in the meantime, and the deduction waits. You track undeducted amounts on Schedule 7, and there’s no expiry on eventually claiming them.6Canada Revenue Agency. RRSPs and Other Registered Plans for Retirement
Contributing to a Spouse’s RRSP
You can put money into your spouse’s or common-law partner’s RRSP and claim the deduction yourself. The contribution uses your room, and you get the tax break at your rate.7Canada Revenue Agency. Contributing to Your Spouse’s or Common-Law Partner’s RRSPs The payoff comes later, when your spouse withdraws the money and it’s taxed in their hands at what should be a lower rate.
The trap is the three-year attribution rule. If your spouse withdraws from a spousal RRSP in the same calendar year you contributed to one, or in either of the two calendar years before, the withdrawn amount is added back to your income instead of theirs.8Canada Revenue Agency. Withdrawing From Spousal or Common-Law Partner RRSPs To avoid it, stop contributing to any of your spouse’s RRSPs for the year of the withdrawal and the two years before. The allocation is calculated on Form T2205.
Claiming the Deduction on Your Return
The deduction is calculated on Schedule 7, “RRSP, PRPP, and SPP Contributions and Transfers, and HBP and LLP Activities.”5Canada Revenue Agency. 5000-S7 Schedule 7 – RRSP, PRPP, and SPP Contributions and Transfers, and HBP and LLP Activities On it you report the contributions you made during the year and in the first 60 days of the following year, any undeducted contributions carried forward, and any Home Buyers’ Plan or Lifelong Learning Plan repayments. The final deduction figure goes on Line 20800 of your T1 General return.9Canada Revenue Agency. Line 20800 – RRSP Deduction
Your financial institution issues official contribution receipts, usually one covering the first 60 days of the year and another for the remaining months. Keep the receipts and related records for at least six years even if you filed online, because the CRA can ask for supporting documents at any point in that window.10Canada Revenue Agency. How Long Should You Keep Your Income Tax Records
What Happens on the Other Side
The deduction defers tax; it doesn’t erase it. Any regular withdrawal from your RRSP is taxable income in the year you take it. Your financial institution withholds tax at source at federal rates that depend on the amount:
- Up to $5,000: 10% withheld
- $5,001 to $15,000: 20% withheld
- Over $15,000: 30% withheld
Withholding isn’t the final tax bill. The full withdrawal is added to your income for the year, and if your total income is high, you may owe more when you file than the institution held back.11Canada Revenue Agency. Tax Rates on Withdrawals The Home Buyers’ Plan and Lifelong Learning Plan are the two exceptions that let you withdraw without immediate tax, provided you repay the amount on schedule.
One boundary worth knowing at the other end: December 31 of the year you turn 71 is the last day you can hold or contribute to an RRSP. By then the plan must be converted into a RRIF, used to buy an eligible annuity, or withdrawn as cash.12Canada Revenue Agency. RRSP Options When You Turn 71 If you have a younger spouse, you can keep using your own deduction room to contribute to their RRSP until the year they turn 71.