Hudson Bay Finance · Situational answers
RRSP deduction limit vs contribution room: the distinction that costs money
The RRSP deduction limit is the most you can deduct this year. What you can put in without the 1% monthly tax is that limit plus $2,000. The two numbers are different, and only one of them appears on your notice of assessment.
Your RRSP deduction limit is the most you can deduct on this year’s return. The amount you can actually put in before the CRA’s 1% monthly tax begins is that limit plus $2,000, and that extra $2,000 buys no deduction at all.
One number is on your notice of assessment. The other is the one that decides whether you owe a monthly tax, and it is nowhere on the notice.
What the deduction limit is
The CRA’s definition is narrow and it is about deducting, not depositing: the deduction limit “is the maximum amount you can deduct from contributions made to your RRSPs” and related plans “and to your spouse’s or common-law partner’s RRSP” for a year (canada.ca).
The contribution side is a separate sentence on the same page: “Generally, you have to pay a tax of 1 percent per month on your contributions that exceed your RRSP deduction limit by more than $2,000” (canada.ca).
Two limits, then, sitting a fixed $2,000 apart. Read either one as “the number”, and you either lose a deduction or start a monthly charge.
Where the number comes from
The CRA’s own calculation, in its order: unused RRSP deduction room at the end of the preceding year, plus the lesser of 18% of the previous year’s earned income and the annual RRSP limit, adjusted against your pension adjustment or prescribed amount for connected persons, plus any pension adjustment reversal, minus any net past service pension adjustment. For 2025 the CRA states the annual limit as $32,490 (canada.ca).
That chain is why the deduction limit moves for reasons that have nothing to do with what you contributed: a pension adjustment from an employer plan reduces it, and a reversal adds it back.
The three places the CRA says to look
“Form T1028, Your RRSP Information for 2025”, your CRA account, and “the RRSP Deduction Limit Statement, on your latest notice of assessment or notice of reassessment” (canada.ca).
Attached to that list is a caution the page prints under its own Note heading: “Future assessments or reassessments may change the information found in the calculation of the RRSP deduction limit statement” (canada.ca).
A number that can be restated after the fact is a number worth keeping your own dated copy of, with the date you read it.
Worked: the same person, two numbers
Say the notice of assessment shows an RRSP deduction limit of $14,300.
| Question | Number | Why |
|---|---|---|
| Most that can be deducted this year | $14,300 | The deduction limit itself |
| Most that can be in the plan with no 1% monthly tax | $16,300 | The limit plus the CRA’s $2,000 |
| Contributed $15,000 | Excess subject to tax: $0 | Under $16,300 |
| Deduction available on that $15,000 | $14,300 | The other $700 carries forward |
| Contributed $17,000 | Excess subject to tax: $700 | $17,000 minus $16,300 |
The $700 in the fourth row and the $700 in the fifth are different animals: one is an undeducted contribution sitting quietly, the other attracts $7 a month. The arithmetic here is this site’s own application of the CRA rules cited above, not a CRA example.
Undeducted contributions are not lost. The CRA says you can claim a deduction for “your unused RRSP” and related-plan “contributions from a previous year” (canada.ca).
Two dates that are not the same date either
Contributions count against a calendar year for the excess tax, but against a contribution period for the deduction. For the 2025 return, the CRA states that contributions “from March 4, 2025 to March 2, 2026 qualify” (canada.ca).
A February contribution therefore sits in one year for the deduction and the next for the excess count. That overlap is where the two numbers in this page most often get confused for each other.
What happens once the contribution has already gone past the cushion is in the $2,000 cushion and what sits past it, and the equivalent problem on the TFSA side is in when the CRA says your TFSA contribution room is something else.
Keeping both numbers in one place
Hudson Bay Finance makes a contribution-room tracker that holds your own dated record of RRSP contributions and separates what is deductible this year from what is merely inside the cushion. RRSP tracking is part of the one-time $19.99 unlock, alongside FHSA and RESP.
Common questions
- Is the RRSP deduction limit the same as contribution room?
- No. The CRA defines the deduction limit as the maximum you can deduct for the year. The amount you can contribute before the 1% monthly excess tax starts is that deduction limit plus $2,000, and the extra $2,000 produces no deduction.
- Where do I find my RRSP deduction limit?
- The CRA lists three places: the RRSP Deduction Limit Statement on your latest notice of assessment or reassessment, your CRA account, and Form T1028 if the CRA sent you one.
- How is the deduction limit calculated?
- The CRA starts from your unused deduction room at the end of the previous year, adds the lesser of 18% of your previous year's earned income and the annual RRSP limit, adjusts for your pension adjustment, adds any pension adjustment reversal, and subtracts any net past service pension adjustment.
- Can my deduction limit change after I have seen it?
- Yes. The CRA notes that future assessments or reassessments may change the information found in the calculation of the RRSP deduction limit statement.
Related situations
- When the CRA says your TFSA contribution room is something else
- New to Canada: how much TFSA room you actually have
- All situational answers, including the other when your number looks wrong pages
Written by Mo Kechout All answers