Nobody plans to put too much into a registered retirement savings plan. It happens because two systems that never speak to each other fund the same account: payroll contributions at work, and the lump sum you transferred in February. Here is how the tax works, what to file, and how to stop the meter.
Key Takeaways
- Your ceiling is the RRSP deduction limit on your latest notice of assessment plus a $2,000 lifetime cushion.
- The penalty tax is 1% of the excess each month, measured at the end of the month.
- It is reported on a separate tax return with its own deadline, months before your personal filing.
- Removing the money quickly almost always beats waiting for new contribution room to open in January.
- Relief exists, but it is discretionary and the bar is higher than most people expect.
How You Over-Contribute to Your RRSP Without Noticing
Four routes account for nearly all of it:
- Group RRSP plus a personal top-up. Payroll contributes every pay period while you separately transfer a lump sum during the first 60 days of the year. Two RRSP accounts, no shared ledger, so nobody keeps track of your contributions in total.
- Pension adjustments. If you belong to a workplace pension plan, the pension adjustment on your T4 reduces the following year’s RRSP room, sometimes to almost nothing. Teachers and other members of large public sector plans are the textbook case, and it is worth checking in the same sitting as the educator school supply tax credit.
- Using the wrong number. People calculate 18% of their pay themselves, forget the pension adjustment, or reuse last year’s figure.
- Spousal plans. A contribution to a spousal plan consumes your room, not your spouse’s, which surprises couples who split their deposits by instinct.
Example. Priya earns $95,000 and belongs to a defined benefit plan. Eighteen percent of her earnings is $17,100, but her pension adjustment is $16,200, so her new room for the following year is $900. She contributes $9,000 through payroll and has over-contributed to her RRSP by $8,100 before anyone looks at the statement.
The $2,000 Buffer and Your RRSP Contribution Room
There are limits to how much you can contribute each year. Your deduction limit is printed on your notice of assessment, and it is the only number worth relying on. It equals 18% of the previous year’s earned income up to the annual dollar limit, minus your pension adjustment, plus every dollar of unused contribution room carried forward. That dollar limit is $33,810 for 2026 and was $32,490 for 2025. It is indexed each year, so confirm yours rather than assuming.
Above that limit sits a lifetime $2,000 cushion, so you can run slightly over without penalty. Money inside the cushion escapes the tax but earns you no tax deduction, so treat it as a tolerance band and not as extra room. Contributions that exceed the cushion attract the tax from the month they land, and the same arithmetic covers PRPP and SPP excess contributions, which share the same limit. One detail catches young savers: you get the cushion only if you were 18 or older at some point in the previous calendar year.
The 1% Per Month Overcontribution Penalty
Part X.1 of the Income Tax Act charges a penalty of 1% per month on the excess amount for every month it remains in the plan, measured at the end of the month. Two things follow from that wording.
Timing is monthly, not daily. A withdrawal that clears on the 2nd still costs you the full charge for the month before, while the same transaction completed two days earlier saves a whole month. When you find the problem, push the paperwork through before month end rather than after the weekend.
The penalty also does not stop on its own. It runs until the excess RRSP contributions are gone, either because you removed them or because new room opening on January 1 absorbed them.
Example. Marcus finds he is $6,700 above his limit. The first $2,000 is sheltered by the cushion, leaving $4,700 exposed at $47 a month. By the time he acts eight months later, the tax is $376 and he still has a return to file for a mistake that produced no benefit at all.
Filing the T1-OVP Return and Paying the Tax
This is a separate individual tax return for RRSP excess contributions, not a schedule attached to your T1. The return and payment come due at the end of March following the year in which the excess existed, weeks before your personal filing deadline. A simplified version covers the straightforward case where the excess came entirely from contributions made in that one year.
Miss the deadline and a late filing penalty of 5% of the balance owing applies, plus a further 1% of that balance for each full month you are late, to a maximum of 12 months. Interest then compounds daily on the whole amount, exactly as it does on any other CRA balance.
Filing is not optional simply because you fixed the account. You still have to pay the penalty for the months the excess existed, so removing the money in September does not erase what accumulated from February. In our personal tax practice, this is the deadline people miss even after they have spotted the problem, because everything else about registered savings runs on the April calendar and this one does not. The Canada Revenue Agency publishes a short test for deciding whether you need to file at all.
How to Withdraw the Excess Contribution
Two routes, and the difference is only about withholding tax:
- Form T3012A. CRA approves the transaction in advance, and your financial institution then releases the unused RRSP contributions with nothing withheld. You keep the full contribution amount, but you wait for approval.
- Withdraw the funds first. Your RRSP provider withholds 10% to 30% depending on the amount and your province. You then claim an offsetting deduction on Form T746 with your return to recover it.
Either way the payout appears on a T4RSP and enters your taxable income, and that offsetting claim is what makes the round trip neutral. Speed usually wins. Waiting several weeks for an approval can cost more in monthly tax than the withholding it avoids, and the withheld amount comes back at assessment anyway.
Asking CRA to Waive the Over-Contribution Tax
CRA can cancel or waive the tax where the excess arose from a reasonable error and you took reasonable steps to eliminate it. The request goes in on Form RC2503 with the evidence attached: contribution histories, the assessment figure you relied on, and dated proof of when you acted.
Read the test narrowly, because CRA does. Simply not knowing your limit is rarely accepted as a reasonable error. An administrator who reported the wrong figure, or an employer contribution that continued after you thought it had stopped, sits much better. Acting within days of discovery matters more than the size of the excess.
One point that changes how you build the request: this relief is discretionary, so a refusal is challenged by judicial review in the Federal Court rather than by objection and appeal to the Tax Court. The question on review is whether the decision was reasonable, not whether it was correct. That makes the first submission the one that counts, and it is worth treating as a file rather than a letter. Note also that Form RC4288 covers taxpayer relief for penalties and interest charges generally, not the 1% tax itself.
Frequently Asked Questions
What happens if I exceed my RRSP contribution limit?
You are allowed to exceed your RRSP deduction limit by $2,000 before the tax starts. Above that, the excess is subject to a penalty tax of 1% a month for as long as the contributions remain in the plan. You also have to file a separate return reporting it, and the excess is not deductible.
What happens if you do not file a T1-OVP?
CRA can assess the tax anyway, add a penalty of 5% of the balance plus 1% for each full month late up to twelve, and charge compound daily interest. Filing voluntarily before contact is materially cheaper than being assessed after it.
How do I know whether I over-contributed?
Compare the limit on your latest assessment against every dollar that reached the plan that year, including employer, payroll and spousal deposits. You go over your RRSP the moment that total passes the ceiling by more than $2,000. You can view your RRSP limit in your CRA My Account; only your own records show your total RRSP contributions for the year.
Does the 1% apply even if I remove the excess quickly?
It applies to any month that ends with an excess still in the plan. Take the money out before month end and you finish that month without incurring a penalty; take it out on the 1st and you have paid for the previous month in full. There is no partial-month proration.
How do I pay the T1-OVP penalty?
Pay it the way you pay any other individual balance: online banking to the CRA payee, My Payment, or a remittance voucher at your bank. Send the money at the same time you file, because the return and the payment share one deadline.
Can I just leave the excess and use next year’s room?
Sometimes that is the better answer, if available contribution room in January is large enough to absorb it and the remaining months of tax cost less than the transaction. Run the arithmetic before deciding, since the calculation flips depending on how many months are left in the year.
The Bottom Line
The cost of this mistake is small if you find it in March and irritating if you find it two years later.
- Take your limit from your assessment, not from a percentage of your salary.
- Count employer, payroll and spousal amounts in the same total.
- Act before month end, because the tax is charged in whole months.
- File the overcontribution return on time to avoid penalties stacking on top of it.
Whether to remove the money, wait, or apply for relief depends on your room next January and on how the error happened, and those answers differ on every file. Our personal tax team handles the return and the waiver request together, and a broader tax planning review usually prevents the second occurrence. Get in touch while there are still months left to save.
