RRSP contribution deadline 2025: March 3, not December 31

The 2025 RRSP contribution deadline was March 3, 2026. Not December 31, 2025. Not April 30. March 3.

Miss it, and that 2025 contribution room - up to $32,490 for most people - disappears forever. The CRA doesn't roll unused room forward with deadlines. December room that isn't used by the following March is gone.

Why March matters for your 2025 tax return

RRSP contributions reduce your taxable income for the year you're filing. Contribute by March 3, 2026, and you can claim it on your 2025 tax return. Contribute March 4 or later, and it only counts toward 2026.

That timing gap catches people. You file your 2025 return in spring 2026, but the contribution deadline for that return was already March 3. At $80k in Ontario, a $5,000 contribution you make in time gets you roughly $1,575 back on that return. Make the same contribution a week late and you wait a full year for the refund.

The 60-day rule

Technically, you get 60 days after December 31 to contribute for the previous tax year. March 3, 2026 was day 60 after December 31, 2025. In leap years like 2024, the deadline shifts to March 2 because February has 29 days.

The CRA counts calendar days, not business days. Weekends and holidays don't extend the deadline. March 3, 2026 fell on a Tuesday - contributions had to be in by end of day Tuesday, whether your bank processed them Tuesday night or Wednesday morning.

What counts as "in" by the deadline

Your financial institution needs to receive the money by March 3, not just process your request. Online transfers usually happen same-day, but don't assume. If you're moving money between banks or writing a cheque, start earlier.

Direct payroll deductions are different - those get dated when they come off your paycheque, not when your employer sends them to your RRSP provider. A December 30 paycheque deduction counts for 2025 even if it takes a week to reach your account.

Spousal RRSP contributions

The same March 3 deadline applies to spousal RRSP contributions. You can contribute to your spouse's RRSP using your contribution room, and the deduction goes on your return - but only if the money is in by the deadline.

Spousal contributions use the contributor's room, not the spouse's. If you have $10,000 in room and your spouse has $5,000, you could contribute all $10,000 to their account and claim the full deduction on your return. The spousal RRSP rules get more complex around withdrawals, but the deadline works the same way.

Over-contribution penalties

Contributing after the deadline doesn't just delay your refund - it can trigger penalties if you exceed your current year's room. The CRA charges 1% per month on excess contributions over $2,000.

Say your 2025 room was $15,000 and you missed the March deadline. In April 2026, you contribute $10,000 thinking it'll count for 2026. But your 2026 room is only $8,000. You're over-contributed by $2,000 - right at the penalty threshold. One dollar more triggers the monthly charge.

The TaxSplit calculator will show your exact contribution room for both years, so you know what you can contribute without penalties.

The next deadline for 2026 contributions is March 2, 2027. Mark it now.