Canadian personal-tax concepts; the numerical rates below are hypothetical teaching assumptions, not a filing table.
A deduction reduces an income amount used to calculate tax. A tax credit reduces the tax itself under its own rules. Many credit claims start with an eligible base amount that is multiplied by a rate, so the claim's label may not be the dollar saving.
A deduction removes an income slice
A valid RRSP deduction is a familiar example. Its immediate income-tax effect depends on which brackets the deduction crosses. If the entire deduction lies within one rate band, multiplication can approximate that effect; a larger deduction may need several slices.
Sources: CRA — Contributing to an RRSP, PRPP or SPP; CRA — Deductions, credits and expenses
Example: three different meanings of $1,000
Assume, solely for illustration, a flat 30% marginal rate across a $1,000 deduction. Tax falls by $300. Now assume a separate credit rule applies 15% to a $1,000 eligible base: the calculated credit is $150. Finally, a credit already calculated as $1,000 could reduce applicable tax by $1,000 if fully usable.
These are alternative mechanisms, not three claims to add together. The assumed 30% and 15% are not current Canadian donation rates. Real credits can have tiers, thresholds and limits, and deductions can also affect income-tested amounts.
Refundable is a separate distinction
A non-refundable credit is limited by applicable tax payable. A refundable credit can be paid through the return even when it exceeds that tax, subject to its eligibility rules. Neither word tells you whether a deduction is permitted or which base amount to enter.
Sources: CRA — Deductions, credits and expenses; CRA — Federal income tax and benefit information for 2025
Read the claim in the right order
Ask what is being reduced, what the eligible base is, which rate applies, and whether there is a cap. For personal charitable donations, follow the specific donation-credit rules rather than treating the full gift as an RRSP-like deduction.
- Identify the correct return line and year.
- Distinguish an eligible amount from the calculated saving.
- Check whether sufficient tax remains to use the credit.
Sources: CRA — How to claim donations (2025)