RRSP over-contribution: the $2,000 cushion and what sits past it

The CRA charges 1% per month on the excess, meaning RRSP contributions that go past your deduction limit by more than $2,000. Under that line there is no monthly tax; over it, the tax applies to the part above the cushion, and it runs every month the excess stays in the plan.

Two details do most of the damage. The cushion is not a deduction, and it is not available to everyone.

The rule, in the CRA’s words

For an excess, the CRA states the rule in one sentence: “Generally, you have to pay a tax of 1% per month on your unused contributions that exceed your RRSP deduction limit by more than $2,000” (canada.ca).

And the age condition, which is easy to miss because it is one line: “you can only qualify for the additional $2,000 amount if you were 18 or older at any time in 2024” (canada.ca). The year 2024 is that CRA page’s own reference year for the 2025 return; the general condition, as the FAQ below states it, is being 18 or older at any time in the previous year.

The measuring stick is the deduction limit shown on your latest notice of assessment, notice of reassessment, or Form T1028, plus $2,000 (canada.ca).

What the tax adds up to, worked

Take a deduction limit of $12,000 and total contributions of $17,500. The cushion covers the first $2,000 above the limit, so the taxed excess is $3,500.

At 1% per month on that excess it is $35 a month. Left in the plan for the rest of a calendar year, say seven months, it is $245. Left for a full year it is $420, on money that also produced no extra deduction. That arithmetic is this site’s own application of the CRA rule above, not a CRA example.

	Amount
RRSP deduction limit	$12,000
Cushion the CRA allows on top	$2,000
Total contributions	$17,500
Excess subject to the 1% monthly tax	$3,500
Tax per month at 1%	$35

The cushion itself is worth stating plainly: it buys you no deduction. Your deduction is capped by the deduction limit, which the CRA defines as “the maximum amount you can deduct from contributions made to your RRSPs” and related plans “for a year” (canada.ca). Money sitting inside the $2,000 is inside the plan and outside the deduction. The distinction that governs it is set out in deduction limit vs contribution room.

The three ways the tax can not apply

The CRA lists them: “you withdrew the excess amounts before the end of the month when the excess contribution was made”, the contributions “were qualifying group plan amounts”, or “the contributions were made before February 27, 1995”. It also warns that amounts withdrawn under the Home Buyers’ Plan or the Lifelong Learning Plan do not get you out of it (canada.ca).

The first one is a within-the-month window, not a grace period. It closes at the end of the month the contribution was made in.

Asking for the tax to be waived

There is a route, and it has two conditions that must both hold: the excess “arose due to a reasonable error”, and you “are taking, or have taken, reasonable steps to eliminate the excess contributions”. The request runs on Form RC2503 (canada.ca).

Supporting documents have to show the exact months of every contribution and withdrawal, and the CRA states outright that it “does not accept the official RRSP receipts or the T4RSP or T4RIF slips for this purpose as they do not contain the exact months” (canada.ca).

Which form goes with which account, and the deadlines attached, is set out in RC243 or T1-OVP: which form your situation needs.

The dated record this all runs on

Every step above, the monthly count, the waiver request, the return itself, is answered from a dated ledger of contributions and withdrawals that the slips do not contain. Hudson Bay Finance makes a contribution-room tracker that keeps one, by account and by date. RRSP tracking is part of the one-time $19.99 unlock, alongside FHSA and RESP.

Common questions

How much can I over-contribute to my RRSP without a penalty?

The CRA states that you generally have to pay a tax of 1% per month on the excess, meaning unused contributions above your RRSP deduction limit plus $2,000. You can only qualify for the additional $2,000 amount if you were 18 or older at any time in the previous year.

Is the $2,000 cushion deductible?

No. The cushion only shelters the amount from the 1% monthly tax. Your deduction is still limited by your RRSP deduction limit, so the cushion sits in the plan without producing a deduction that year.

Can I avoid the tax if I take the excess back out quickly?

The CRA lists withdrawing the excess before the end of the month in which the excess contribution was made as one of the situations where you may not have to pay the 1% tax on all of your excess contributions.

When is the RRSP excess-contribution return due?

The CRA states the completed T1-OVP and the tax are due no later than 90 days after the end of the year in which you had the excess contributions.

Related situations

• You got a CRA letter about a TFSA over-contribution
• Asking the CRA to waive a TFSA penalty: what the request has to show
• FHSA over-contribution: the penalty and the 15-year clock
• RC243 or T1-OVP: which form your situation needs
• All situational answers, including the other when the contribution already happened pages