An RRSP over-contribution penalty is a tax of 1% per month that the Canada Revenue Agency charges on any amount you have deposited in your registered retirement savings plan above your personal deduction limit plus a $2,000 lifetime cushion. The tax keeps accruing every calendar month the excess sits in the account, so the cost of doing nothing grows quickly. Fixing it means pulling the extra money out and filing a specific return within 90 days of year-end.
How Much You Can Contribute Before the Penalty Starts
Your deduction limit for the year is printed on your most recent Notice of Assessment or on Form T1028.1Canada Revenue Agency. Where Can You Find Your RRSP Deduction Limit On top of that limit, the CRA lets you sit up to $2,000 above without triggering the penalty tax. Contributions inside that $2,000 cushion are not deductible, but they will not cost you 1% a month either.2Canada Revenue Agency. How Contributions Affect Your RRSP Deduction Limit
One exception matters: to qualify for the cushion, you must have been 18 or older at some point in the previous year. Anyone younger pays the 1% monthly tax on every dollar above their deduction limit, with no buffer at all.3Canada Revenue Agency. Excess Contributions
How the 1% Monthly Tax Is Calculated
The penalty is imposed under Part X.1 of the Income Tax Act at 1% per month on the amount above your deduction limit plus the $2,000 buffer.4Canada Revenue Agency. RRSPs and Other Registered Plans for Retirement It applies for each calendar month the excess is in the plan, whether or not the investments inside it gain or lose value.
A quick example. Say your deduction limit is $10,000 and you deposit $17,000. The first $10,000 is deductible. The next $2,000 falls inside the buffer. The remaining $5,000 is your taxable excess, and it costs $50 per month. Four months of inaction is $200 in penalty tax, before any late-filing charge.
The tax keeps running until one of two things happens: you withdraw the excess, or new contribution room opens on January 1 of the following year and absorbs the overage.3Canada Revenue Agency. Excess Contributions Waiting for new room to appear is a gamble; every month you wait is another 1%.
Getting the Excess Out
The fastest way to stop the tax from accruing is to withdraw the excess. Normally, an RRSP withdrawal triggers withholding tax at 10% on amounts up to $5,000, 20% on amounts from $5,001 to $15,000, and 30% above that.5Canada Revenue Agency. Tax Rates on Withdrawals That withholding does not fit an over-contribution you never deducted, so the CRA offers a workaround.
Form T3012A: Withdraw Without Withholding
Form T3012A asks the CRA to authorize your RRSP issuer to release the excess amount without deducting withholding tax.6Canada Revenue Agency. Withdrawing Unused Contributions You submit the form, wait for the CRA to send back a certified approved copy, and then hand that to your financial institution, which processes the withdrawal free of withholding.7Canada Revenue Agency. T3012A Tax Deduction Waiver on the Refund of Your Unused RRSP, PRPP, or SPP Contributions
The catch is time. The CRA does not commit to a turnaround, and the 1% monthly tax keeps running while you wait. If the excess is large, some people withdraw directly, accept the withholding, and claim credit for the withheld tax when they file their T1. That gets the money out faster and stops the penalty sooner, at the cost of tying cash up until the return is processed.
Filing Form T1-OVP and the 90-Day Deadline
If you owe the 1% tax for any month during the year, you must file Form T1-OVP. It walks through the excess month by month and calculates what you owe.8Canada Revenue Agency. T1-OVP Individual Tax Return for RRSP, PRPP and SPP Excess Contributions You will need every contribution date and amount, plus the months the surplus was in the plan.
The return and the payment are both due within 90 days after the end of the calendar year the excess existed in.3Canada Revenue Agency. Excess Contributions For an over-contribution during 2026, that puts the deadline at March 31, 2027 (or the next business day if it falls on a weekend).
What Happens If You File Late
Missing the 90-day deadline stacks new costs on top of the 1% tax. The late-filing penalty is 5% of the unpaid balance plus 1% for each full month the return remains outstanding, up to 12 months.9Canada Revenue Agency. Interest and Penalties on Late Taxes Daily compound interest also runs on any unpaid balance from the day after the due date.10Canada Revenue Agency. Filing and Payment Due Dates for Your T1-OVP Return File late and you end up paying a penalty on the penalty.
Asking the CRA to Waive the Tax
The CRA can cancel or waive the 1% tax if the over-contribution came from a reasonable error and you moved promptly to fix it.11Canada Revenue Agency. Cancel or Waive Penalties and Interest at the CRA Reasonable error usually looks like an administrative mistake at your financial institution, incorrect employer information about a pension adjustment, or a misunderstanding of carry-forward room. Not bothering to check your limit is a harder case to make.
Use Form RC2503 for the waiver request tied to the Part X.1 excess contribution tax.12Canada Revenue Agency. RC2503 Request for Waiver or Cancellation of Part X.1 Tax – RRSP, PRPP and SPP Excess Contribution Tax Explain what went wrong, why you did not catch it sooner, and what you did once you did. Attach the paper trail: account statements showing the contributions, proof of the withdrawal or the T3012A submission, and the filed T1-OVP. The clearer the record of quick action, the better the chance of relief.
Spousal RRSPs: Who Owes the Tax
A contribution to a spousal RRSP counts against your deduction limit, not your spouse’s. If it pushes you over, you are the one liable for the 1% monthly tax, even though the money is in your spouse’s account. The excess can be cleared by a withdrawal from either your own RRSP or the spousal plan. Either stops further penalty, but a withdrawal from a spousal RRSP can trigger income attribution rules, so timing matters.
How to Avoid an Over-Contribution
Check your current deduction limit through CRA My Account or your most recent Notice of Assessment before making any lump-sum deposit. Be extra careful early in the year: contributions in the first 60 days can be deducted on either the prior year’s return or the current year’s, and it is easy to double-count room during that window.2Canada Revenue Agency. How Contributions Affect Your RRSP Deduction Limit
If you belong to a group RRSP or an employer pension plan, your pension adjustment will not show up on your Notice of Assessment until after the employer reports it. The room the CRA portal shows may be higher than your real room until that adjustment lands.13Canada Revenue Agency. Line 20600 – Pension Adjustment When in doubt, leave a margin. Some people deliberately park up to $2,000 above their limit for the extra sheltered growth inside the buffer, but there is no deduction on that amount and no room for slippage above it.
One boundary worth flagging: TFSA over-contributions look similar but follow different rules. The 1% monthly tax applies from the first dollar over, with no $2,000 cushion, and the excess is reported on Form RC243 rather than the T1-OVP.14Canada Revenue Agency. If You Owe Tax on Excess TFSA Amounts If your problem is with a TFSA, the RRSP forms and deadlines above do not apply.