Key Takeaways
- 1.Your 2025 RRSP deduction limit is 18% of your 2024 earned income (capped at $32,490), minus your pension adjustment, plus any carry-forward room from prior years.
- 2.The February 28, 2026 deadline is for deducting contributions on your 2025 return — the tax year itself ended December 31, 2025, but CRA gives a 60-day grace window.
- 3.At $120K in Ontario, your combined marginal rate is 31.48% on income above $111,733 — every $1,000 of RRSP contribution in that bracket saves $314.80 in tax.
- 4.CRA allows a $2,000 lifetime over-contribution buffer with no penalty. Beyond that, the penalty is 1% per month on the excess.
- 5.A $29,000 contribution at $120K income produces an estimated $8,795 refund and drops your taxable income to $91,000 — pulling you entirely out of the 31.48% bracket.
How CRA Calculates Your 2025 RRSP Contribution Room
Your RRSP deduction limit for the 2025 tax year is built from three components. CRA calculates this automatically and reports it on your Notice of Assessment (NOA) after you file your 2024 return, but understanding the formula helps you plan before the NOA arrives.
| Component | Formula | Amount |
|---|---|---|
| 18% of 2024 earned income | $120,000 × 18% | $21,600 |
| 2025 RRSP dollar limit (cap) | Maximum for 2025 | $32,490 |
| New room earned for 2025 | Lesser of $21,600 and $32,490 | $21,600 |
| Minus: 2024 pension adjustment (PA) | Employer pension plan offset | ($0)* |
| Plus: unused room from prior years | Carry-forward balance | $7,400* |
| 2025 RRSP deduction limit | $21,600 − $0 + $7,400 | $29,000 |
*This scenario assumes no employer pension plan (PA = $0) and $7,400 in unused carry-forward room from years where contributions were below the limit. Your actual PA and carry-forward are on your 2024 NOA or CRA My Account.
The key points: (1) the 18% calculation uses your prior year's earned income, not the current year, (2) the dollar cap for 2025 is $32,490, which only binds if your earned income exceeds $180,500, and (3) unused room carries forward indefinitely with no expiry. If you have not maximized your RRSP in previous years, your carry-forward balance could be substantial. For a detailed comparison of whether that room is better used for RRSP or TFSA contributions at your income level, see our RRSP vs TFSA Ontario comparison.
The February 28 Deadline Trap
The RRSP system has two dates that people constantly confuse:
- December 31, 2025: The tax year ends. Your income, deductions, and tax owing are all calculated based on this calendar year.
- February 28, 2026: The last day to make an RRSP contribution that can be deducted on your 2025 tax return. This 60-day grace period exists because CRA recognizes that people often need time after year-end to finalize their contribution strategy.
The trap: contributions made in January or February 2026 can be deducted on either your 2025 or 2026 return — you choose when you file. But contributions made on March 1 or later can only be deducted for 2026. If you are one day late, you lose the ability to reduce your 2025 tax bill.
Processing time matters: The deadline is when the financial institution receives the funds, not when you initiate the transfer. Online bank transfers to a brokerage RRSP typically take 2–3 business days. If February 28 falls on a Saturday (as it does in 2026), confirm with your institution whether contributions received on the next business day (March 2) still qualify. CRA generally accepts the postmark date for mailed contributions and the transaction date for electronic ones, but institutional processing delays are your risk, not CRA's.
Ontario Marginal Tax Rates at $120K: Where Your RRSP Savings Come From
To understand how much an RRSP contribution actually saves you in tax, you need to know which brackets your income falls into. At $120,000 of taxable income in Ontario for 2025, your income spans multiple federal and provincial brackets. For the full bracket-by-bracket breakdown at several Ontario income levels, see our Ontario income tax take-home calculator.
| Taxable Income Range | Federal Rate | Ontario Rate | Combined |
|---|---|---|---|
| $55,867 – $111,733 | 20.50% | 9.15% | 29.65% |
| $111,733 – $150,000 | 20.50% | 11.16% | 31.48%* |
*Ontario's surtax effectively increases the provincial rate above $93,054 of Ontario tax. The 31.48% combined rate applies to the portion of income between $111,733 and $150,000. Your first RRSP dollars reduce income in this highest bracket, making them the most valuable.
At $120,000, you have $8,267 of income sitting in the 31.48% bracket ($120,000 − $111,733). This means your first $8,267 of RRSP contribution saves 31.48 cents per dollar. After that, the remaining contribution saves at the 29.65% rate. This bracket-stacking effect is why high-income RRSP contributions are so effective — and why the exact contribution amount matters.
Marginal Rate Savings: $120K vs $90K After RRSP Deduction
A large enough RRSP contribution does not just reduce your tax bill — it moves you into a lower bracket entirely. If you contribute $29,000, your taxable income drops from $120,000 to $91,000. That pulls you completely out of the 31.48% combined bracket and back into the 29.65% zone.
This matters for two reasons: (1) the immediate refund is calculated at the rates you actually avoid, and (2) income-tested benefits like the Ontario Trillium Benefit and the Canada Child Benefit (if applicable) may increase as your net income falls. The compounding effect of lower net income on benefit clawbacks is often overlooked when people calculate their "RRSP refund."
The Refund Table: $10K, $18K, and $29K Contributions
Here is what actually happens at three different contribution amounts, assuming $120,000 of T4 employment income, Ontario residency, no pension adjustment, and $29,000 of total available room. If you are comparing how provincial rates differ at this income level, our Alberta vs Ontario tax comparison covers the $120K bracket directly.
| Metric | $10,000 | $18,000 | $29,000 |
|---|---|---|---|
| Taxable income after deduction | $110,000 | $102,000 | $91,000 |
| Amount taxed at 31.48% | $0 | $0 | $0 |
| Tax saved at 31.48% bracket | $2,602 | $2,602 | $2,602 |
| Tax saved at 29.65% bracket | $513 | $2,883 | $6,143 |
| Estimated CPP/EI impact | $0 | $0 | $0 |
| Estimated net tax refund | $3,115 | $5,485 | $8,745 |
| Effective refund rate | 31.2% | 30.5% | 30.2% |
| Remaining unused room | $19,000 | $11,000 | $0 |
Refund estimates are based on 2025 federal and Ontario tax rates applied to the specific bracket ranges. CPP/EI premiums are unaffected by RRSP deductions (they are calculated on gross employment earnings). Actual refund depends on other deductions, credits, and your total tax situation.
Notice the effective refund rate declines as the contribution increases. The first $8,267 saves at 31.48%, but everything beyond that saves at 29.65%. A $10,000 contribution is heavily weighted toward the higher bracket, so its effective rate is 31.2%. The full $29,000 contribution averages out to 30.2% because most of the savings come from the lower bracket. Every dollar still saves meaningful tax — but the marginal return diminishes as you move down through the brackets.
The RRSP Over-Contribution Penalty: The $2,000 Buffer
CRA permits a lifetime $2,000 over-contribution to your RRSP without penalty. This means if your deduction limit is $29,000, you can contribute up to $31,000 without triggering the penalty. However, you cannot deduct the extra $2,000 — it sits in the RRSP growing tax-sheltered, but you get no tax refund on it until you accumulate new contribution room in future years.
| Scenario | Contribution | Over Limit By | Monthly Penalty |
|---|---|---|---|
| Within limit | $29,000 | $0 | $0 |
| Within $2K buffer | $31,000 | $2,000 (buffer) | $0 |
| Over buffer | $35,000 | $6,000 ($4,000 excess) | $40/month |
The 1% monthly penalty applies only to the amount exceeding both your deduction limit and the $2,000 buffer. In the over-buffer example: $35,000 − $29,000 limit − $2,000 buffer = $4,000 excess × 1% = $40/month. You must file Form T1-OVP within 90 days.
The $2,000 buffer is not "free" contribution room. It is a penalty-free cushion that CRA provides to account for timing differences and rounding errors. Deliberately using it as a strategy to shelter an extra $2,000 of investment growth is technically possible, but the administrative overhead (tracking it, ensuring you never accidentally go further over) is rarely worth the marginal benefit for most people.
Pension Adjustment: The Variable Most People Forget
If your $120,000 salary comes with a workplace pension plan, your RRSP room will be significantly lower than the $21,600 calculated above. The pension adjustment (PA) is reported in Box 52 of your T4 slip and reduces your RRSP room dollar-for-dollar.
For a typical defined benefit pension plan paying 2% of best average earnings per year of service, the PA formula is (9 × annual pension benefit earned) − $600. At $120,000 salary with a 2% accrual rate, the annual benefit earned is $2,400, and the PA would be (9 × $2,400) − $600 = $21,000. That would reduce your new RRSP room from $21,600 to just $600 for the year.
For a defined contribution plan where the employer matches 5% and you contribute 5%, the PA is the total contributed: $12,000 (10% of $120,000). Your new RRSP room would be $21,600 − $12,000 = $9,600. For self-employed earners without a pension plan who face different CPP considerations, see our self-employed CPP contributions calculator.
Strategy: Contribute the Maximum or Save Room for Next Year?
With $29,000 of available room and $120,000 of income, should you contribute the full amount or hold some back? The answer depends on one question: do you expect your income to be materially higher next year?
- If your income will stay around $120K: Contribute the full $29,000 now. You are saving at approximately 30%+. Waiting gains you nothing because your rate will be the same next year, and you lose a year of tax-sheltered compound growth.
- If your income will jump significantly (e.g., to $160K+): You might hold back some room. At $160K, the combined Ontario marginal rate rises to 33.89% (federal 26% + Ontario surtax-adjusted). Each dollar of RRSP deduction at that rate saves $338.90 vs $296.50 at $120K. But you need to weigh this against the guaranteed tax-sheltered growth you give up by waiting. In most cases, the growth advantage of contributing now outweighs the 3–4% rate difference.
- If you expect your income to drop: Absolutely contribute now. Your current marginal rate of 29.65–31.48% is higher than what you will face at lower income levels. Lock in the deduction while it is most valuable.
How to Actually Make the Contribution Before February 28
The mechanics of contributing before the deadline are straightforward, but timing mistakes are common:
- Verify your exact room. Log into CRA My Account and check your RRSP deduction limit. This reflects your room as of your last filed return plus any pension adjustment reversals.
- Choose the account. Contribute to your existing RRSP, a spousal RRSP (deduction on your return, funds in your spouse's account), or open a new RRSP if needed. For spousal RRSP strategies at your income level, our spousal RRSP calculator walks through the income-splitting math.
- Initiate the transfer by February 25 at the latest. Allow 2–3 business days for electronic transfers. If February 28 is a Saturday (as in 2026), the effective deadline may be Friday, February 27, for electronic transfers that need to settle by end of business.
- Get and keep the receipt. Your financial institution will issue an RRSP contribution receipt showing the date and amount. You need this to claim the deduction on your tax return.
- Decide when to deduct. Contributions made in January–February 2026 can be deducted on your 2025 or 2026 return. If your 2025 income is higher than expected 2026 income, deduct it for 2025.
Important Disclaimer
This article provides general information based on the Income Tax Act of Canada (sections 146 and 204.1–204.3 regarding RRSP contributions and over-contribution penalties), 2025 federal tax brackets, and 2025 Ontario provincial tax rates including surtax. The scenario uses simplified assumptions — a single T4 income source, no pension adjustment, and no other deductions or credits beyond the basic personal amount. Real tax situations involve additional variables including Ontario surtax phase-ins, the Ontario Health Premium, CPP2 contributions for 2025, and income-tested benefit clawbacks. Tax rates and bracket thresholds are subject to annual indexation. This is not tax, legal, or financial advice. Consult a qualified tax professional before making RRSP contribution decisions, and verify your exact contribution room through CRA My Account.