Compute RRSP contribution room.
Total RRSP room this year
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This year’s 18%
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2026 dollar cap
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Your breakdown
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What "deduction room" actually means
Your RRSP deduction limit is not a single number that resets each January. It is a running balance the CRA keeps for you, and it only grows when you have earned income. For the 2026 tax year the formula is 18 percent of your 2025 earned income, capped at $32,490, then reduced by any pension adjustment from a workplace pension, then increased by every dollar of room you did not use in prior years. Earned income here means employment income, net self-employment income, net rental income, and a few other sources. It does not include investment income, capital gains, or most pension payments, which is why a retiree living on dividends generates no new room.
The single most useful thing to know is that unused room never expires. If you earned room in 2018 and never contributed, it is still sitting there waiting. That is why this tool asks for your carry-forward separately. People routinely have far more room than they assume.
Where the $32,490 ceiling bites
The dollar cap only matters once your prior-year earned income passes roughly $180,500, because 18 percent of that figure equals the cap. Below that income, the 18 percent rule governs and the ceiling is irrelevant. The calculator flags this for you: if your 18 percent figure lands above $32,490, it shows the capped number and tells you the cap is binding. A common mistake is assuming the cap applies to everyone, then under-contributing.
It also helps to know that the dollar limit moves a little each year, indexed to wage growth, so the figure you used two years ago will be lower than today’s. The calculator uses the 2026 number, $32,490. If you are reconstructing room from several past years, each year carried its own limit, which is another reason the Notice of Assessment, where the CRA has already done that year-by-year stacking, is the authoritative source. For most middle-income earners the practical takeaway is simple: focus on the 18 percent figure, because you will almost never bump into the ceiling unless your income is well into six figures.
A $90,000 earner with carry-forward, line by line
Take someone who earned $90,000 in 2025, has $10,000 of unused room banked from earlier years, and no workplace pension. Here is exactly what the tool computes.
The $16,200 is well under the cap, so the ceiling does nothing here. The whole story is 18 percent of income plus banked room.
The pension adjustment trap
If you belong to a defined-benefit or defined-contribution workplace pension, your employer reports a pension adjustment on your T4 in box 52. That figure reduces this year’s new room dollar for dollar, because the government counts your pension accrual as retirement saving you already received the tax break on. A member of a generous DB plan can see their new RRSP room shrink to almost nothing. If you ignore the pension adjustment and contribute as though you had the full 18 percent, you risk an over-contribution. The CRA allows a $2,000 lifetime cushion, but past that it levies a 1 percent per month penalty tax on the excess until you withdraw it.
What happens if I accidentally over-contribute?
The CRA gives you a lifetime cushion of $2,000 in excess contributions with no penalty, which absorbs small errors. Go past that buffer and you face a penalty tax of 1 percent per month on the excess, charged for every month it sits in the account. The fix is to withdraw the over-contribution promptly and file form T1-OVP for the affected period; the penalty stops accruing the month the excess money leaves the plan. Acting quickly is everything here, because the charge compounds month after month until you correct it.
Can I contribute now but claim the deduction in a later year?
Yes, and it is an underused move. Contributing uses room immediately, but you choose which year to actually deduct the contribution on your return. If you expect a big raise next year that pushes you into a higher bracket, contribute now to lock in the room and growth, then carry the deduction forward and claim it when your marginal rate is higher. The deduction is worth more in a higher bracket, so timing it deliberately can add real money.