Your RRSP contribution room is calculated by taking 18% of the earned income you reported on last year’s tax return or the annual dollar cap (whichever is smaller), subtracting any pension adjustments from a workplace retirement plan, adding back any pension adjustment reversal, and then adding every dollar of unused room you’ve carried forward from previous years. The CRA does the math automatically and prints the result on your Notice of Assessment. For the 2026 tax year, the dollar cap is $33,810.
The Full Formula
Written out step by step, new room for the year equals the lesser of 18% of prior-year earned income or the annual dollar cap, minus your Pension Adjustment and any Past Service Pension Adjustment, plus any Pension Adjustment Reversal.1Canada.ca. Pension Adjustment (PA) That figure is only the room created this year. Your total available room is that new room plus any unused room carried forward from earlier years.
Each piece changes the answer, so it’s worth walking through them one at a time.
The 18% Side and the Annual Dollar Cap
The CRA starts by taking 18% of the earned income you reported on the prior year’s return. It compares that number to a fixed dollar ceiling for the year and uses whichever is smaller.1Canada.ca. Pension Adjustment (PA)
Recent dollar caps:
- 2024: $31,560
- 2025: $32,4902Canada.ca. How Contributions Affect Your RRSP Deduction Limit
- 2026: $33,810
To hit the 2026 cap on the 18% side, you’d need at least $187,833 of earned income in 2025. Earn less and you’re limited to 18% of what you actually made. Earn more and your new room stops climbing at $33,810 no matter how high your income runs.
What Counts as Earned Income
The definition of earned income for RRSP purposes is narrower than the total income line on your tax return. It includes employment salary and wages, net self-employment income, and net rental income, and it subtracts certain deductions like employment expenses and business or rental losses.3Canada Revenue Agency. RRSPs and Other Registered Plans for Retirement
Several common income types are excluded. Interest from savings accounts, stock dividends, and capital gains do not generate RRSP room. If most of your income comes from investments rather than active work, your room will be lower than a glance at your total income might suggest.
How Pension Adjustments Change the Number
If you belong to a workplace Registered Pension Plan or a Deferred Profit-Sharing Plan, your employer reports a Pension Adjustment on your T4 each year. The PA reflects the value of retirement benefits your employer’s plan built up on your behalf during the previous year, and the CRA subtracts it from your RRSP room.1Canada.ca. Pension Adjustment (PA)
The reasoning is that someone with a generous employer pension is already receiving tax-assisted retirement savings, so their personal RRSP room shrinks to keep the total tax shelter roughly comparable across workers. If your employer improves your pension retroactively for past years of service, a Past Service Pension Adjustment reduces your available room by a further amount.1Canada.ca. Pension Adjustment (PA)
Getting Room Back Through a Pension Adjustment Reversal
The adjustment can also run the other direction. If you leave an employer pension plan and receive a termination benefit worth less than the PAs and PSPAs that had been reported for you, the CRA calculates a Pension Adjustment Reversal. The PAR adds room back into your RRSP for the year your membership in the plan ended.4Government of Canada. Pension Adjustment Reversal Guide
Unused Room Carries Forward Indefinitely
Your total available contribution room is cumulative. Any room you don’t use in a given year rolls forward automatically with no expiration date, reaching back to room accumulated since 1991.5Canada Revenue Agency. What to Do With Unused RRSP, PRPP or SPP Contributions
For most people, this is where total room ends up much larger than the new room created in any single year. Low-income years, early-career years, or years you simply skipped all add to the pile. The CRA tracks the running total for you.
Withdrawals Do Not Restore Room
One boundary to name before the calculation is complete: money you withdraw from your RRSP does not come back as room the following year. The withdrawal is added to your taxable income for the year it’s taken, and the room you originally used to make the contribution is gone. This is a real difference from a Tax-Free Savings Account, where withdrawals do restore room.
Your financial institution withholds tax at source on RRSP withdrawals at the following rates for residents outside Quebec:
- Up to $5,000: 10% withheld
- $5,001 to $15,000: 20% withheld
- Over $15,000: 30% withheld
The withholding is not the final tax owed. The full withdrawal amount is added to your income for the year, and you reconcile the difference when you file.6Canada.ca. Tax Rates on Withdrawals
How to Check Your Actual Room
The most reliable source is your Notice of Assessment, which the CRA sends after processing your tax return. It includes an RRSP Deduction Limit Statement showing the exact available room for the following year, with the cumulative carryforward already included.7Canada.ca. Notices of Assessment – NOA or NOR – Personal Income Tax
You can also check the same figure any time through CRA My Account online or the MyCRA mobile app.7Canada.ca. Notices of Assessment – NOA or NOR – Personal Income Tax Just be aware that the online number can lag reality in two situations: you’ve made contributions that haven’t been reported to the CRA yet, or you’ve recently changed jobs and a new Pension Adjustment hasn’t been processed. If you’re about to make a large deposit and either of those applies, cross-check your most recent T4 slips and contribution receipts against the CRA’s figure first.