The 18% rule, unused room carry-forward, pension adjustments, how to check your room, over-contribution limits, and the spousal RRSP income splitting strategy.
RRSP contribution room is earned annually based on your prior year's income. Here's the exact formula CRA uses.
"Earned income" for RRSP purposes includes employment income, self-employment income (net), rental income (net), research grants, disability payments from CPP, and a few other sources. It does not include investment income, pension income, or CPP/OAS payments.
The annual RRSP deduction limit increases each year with average wages. You earn 18% of prior-year income up to this maximum:
| Tax Year | RRSP Dollar Limit | Income Required to Max Out |
|---|---|---|
| 2022 | $29,210 | $162,278 |
| 2023 | $30,780 | $171,000 |
| 2024 | $31,560 | $175,333 |
| 2025 | $32,490 | $180,500 |
| 2026 | ~$33,500 (estimated) | ~$186,000 |
Any RRSP room you don't use in a given year carries forward indefinitely. There's no expiry. This is one of the most underused features of the RRSP system — Canadians collectively hold billions in unused room.
Strategy example: You graduated in 2018 and started earning $60,000 per year. You couldn't afford to max your RRSP every year. By 2026, you've accumulated significant unused room. Now your income is $120,000. You can make a large lump-sum RRSP contribution, get a substantial tax refund (in a higher bracket), and deploy it into investments. The tax savings are front-loaded to when they're most valuable.
Some Canadians intentionally defer RRSP contributions until they're in a higher income bracket, accumulating unused room during lower-income years (school, early career, parental leave). This is a legitimate tax planning strategy, though it foregoes years of tax-sheltered growth.
The most reliable source is CRA's MyAccount portal:
Your room is also printed on your annual Notice of Assessment (NOA) from CRA, which you receive after filing your tax return. If you file electronically, your NOA arrives within days via CRA My Account. Look for "RRSP deduction limit for [current year]."
Your financial institution also typically shows your available RRSP room when you log into your RRSP account online — but this figure may be outdated. CRA's MyAccount is the authoritative source.
If you participate in a workplace defined benefit (DB) or defined contribution (DC) pension plan, you receive a Pension Adjustment on your T4 each year. The PA reduces your RRSP room to prevent people with pensions from double-dipping on tax-advantaged retirement savings.
The PA is calculated by your employer and appears in Box 52 on your T4. The formula for DB plans is complex (it's based on the value of pension earned in the year, using a government-prescribed factor). For DC plans, it equals employer contributions made on your behalf.
Leaving an employer: If you leave a job and receive a Pension Adjustment Reversal (PAR), your RRSP room is restored. This is important to understand if you're switching jobs and moving money from a defined benefit plan into a RRSP or LIRA.
The CRA provides a lifetime over-contribution buffer of $2,000 — you can exceed your RRSP room by up to $2,000 at any time without penalty (though you get no tax deduction for the excess). Going beyond $2,000 over your limit triggers a penalty:
Over-contribution scenarios to watch: (1) Receiving a late T4 that reveals employer pension contributions you weren't tracking; (2) Contributing early in January before your previous year's NOA has been issued, overestimating your room; (3) Spousal RRSP contributions counting against the contributing spouse's room, not the annuitant spouse's room.
If you discover you've over-contributed, withdraw the excess amount as soon as possible to stop the monthly penalty accumulation. File the T1-OVP regardless.
A spousal RRSP allows the higher-income spouse to contribute to an RRSP registered in their partner's name. The contributor gets the tax deduction (valuable in a high tax bracket); the annuitant spouse eventually withdraws the funds (in a lower tax bracket in retirement). The result: income splitting that can significantly reduce total household taxes in retirement.
Scenario: Partner A earns $200,000/year; Partner B will earn $30,000/year in retirement. Both in Ontario.
Without spousal RRSP: All retirement income drawn from Partner A's RRSP at marginal rate ~50%. On $100,000 withdrawal = ~$50,000 tax.
With spousal RRSP strategy over 20 years: Partner B withdraws $50,000/year at ~25% marginal rate. Same total income, dramatically lower tax.
Long-term household tax saving: potentially $200,000–$400,000+ over a 20-year retirement.
RRSP contributions must be made by 60 days after year end (i.e., March 1 for the previous tax year, or March 2 in a leap year). The last year you can contribute to an RRSP is the year you turn 71. By December 31 of your 71st year, your RRSP must be converted to an RRIF (or annuity). See our RRIF guide for what happens next.
If you can't max all three registered accounts, here's a general priority framework:
See our full RRSP vs TFSA guide and the youth investing guide for more detail on account prioritization strategies.
RRSP limits and tax rules are set by CRA and subject to change. This guide is for informational purposes and does not constitute tax or financial advice. Consult a qualified tax professional for advice specific to your situation. Verify your exact contribution room at CRA MyAccount before contributing. Last updated March 2026.