Simplified employment-income comparison for supported 2025/2026 jurisdictions; example uses 2025 Ontario.
An allowed RRSP deduction reduces the income used in the tax calculation. The saving depends on the income slices removed and applicable adjustments. Making a contribution and choosing when to deduct an eligible amount are related but separate decisions.
Room comes before the estimate
Check your personal deduction limit and available contribution room using CRA records and your own recent transactions. Do not treat a calculator's input ceiling as permission to contribute. Existing unused contributions and pension adjustments can matter; a salary-only formula cannot establish your room.
Example: a deduction within one bracket
Assume $85,000 employment income, a valid $5,000 RRSP deduction, Ontario residence for 2025 and no other modeled changes. In the simplified model, the whole deduction lies in the 20.5% federal and 9.15% Ontario slices. $5,000 × (20.5% + 9.15%) = $1,482.50 of modeled savings.
This is not necessarily a $1,482.50 refund. It excludes CPP/EI and personal adjustments, assumes sufficient room, and leaves actual payments unchanged. At a bracket boundary, part of the deduction may save at a different rate.
Tax deferral is not permanent tax elimination
RRSP funds generally face tax when withdrawn under ordinary withdrawal rules. The value of deferral depends on future circumstances, not just today's deduction. Special withdrawal programs have their own conditions and are outside this calculator.
Sources: CRA — RRSP withdrawals
Before moving money
Compare the deduction you intend to claim with your available room and cash needs. Borrowing just to produce a refund adds a separate cost that this savings figure does not evaluate.
- Confirm current room and already-made contributions.
- Choose a deduction amount you can actually claim.
- Compare tax before and after, then consider future withdrawals and liquidity.