“Deduction” and “credit” are two of the most frequently confused terms in Canadian tax — even by people who have been filing taxes for decades. The practical difference can mean hundreds to thousands of dollars in your tax calculation.
The fundamental difference
Deduction: Lowers your taxable income before tax is calculated. Credit: Lowers your tax owing after income tax is calculated.
Why this matters (worked example)
Suppose you have $85,000 in taxable income and face a combined federal + Ontario marginal rate of approximately 43.41% at that income level.
Scenario A: $1,000 deduction
- Taxable income falls from $85,000 to $84,000
- Tax saving: $1,000 × 43.41% = $434
Scenario B: $1,000 tax credit (non-refundable, at 15% federal rate)
- Tax owing falls by $1,000 × 15% = $150
- (Plus any provincial component from your province)
For the same $1,000, the deduction saves nearly 3× more in this bracket. A deduction’s value scales with your marginal rate; a non-refundable credit always reduces tax at the flat credit rate (15% federally for most credits).
Tax deductions in Canada: how they work
A deduction reduces the income figure that the tax rate is applied to. The formula:
Tax owing = (Taxable income − deductions) × applicable marginal rates
Value depends on your marginal rate
| Your marginal tax bracket | Value of a $1,000 deduction |
|---|---|
| ~20% (approximately $15K–$55K, varies by province) | ~$200 |
| ~33% (approximately $55K–$100K, varies) | ~$330 |
| ~43% (approximately $100K–$150K, varies) | ~$430 |
| ~53% (highest combined bracket, varies by province) | ~$530 |
The same contribution or expense is worth MORE if you have higher income — which is a key RRSP planning principle.
Common deductions
| Deduction | Reported on | Value scales with income? |
|---|---|---|
| RRSP contribution | Schedule 7, Line 20800 | Yes |
| Union / professional dues | Line 21200 | Yes |
| Child care expenses | Line 21400, Form T778 | Yes |
| FHSA contributions | Line 20805 | Yes |
| Employment expenses (T2200) | Line 22900, T777 | Yes |
| Moving expenses (40km+ rule) | Line 21900 | Yes |
| Investment carrying charges (interest) | Line 22100 | Yes |
| Spousal support paid | Line 22000/22010 | Yes |
| Self-employment net income deductions | T2125 | Yes |
| Deductible business meals, vehicle, home office | T2125 | Yes |
Timing a deduction for maximum benefit
RRSP contributions can be deferred — you can contribute to an RRSP in December but choose not to claim the deduction on that year’s return. Instead, you carry the deduction forward to a year when your income (and marginal rate) is higher. This produces a larger tax saving for the same contribution.
Example — defer RRSP deduction:
- 2025: You earn $55,000. RRSP deduction would save you ~31%
- 2026: You earn $125,000 after a promotion. RRSP deduction saves you ~46%
- Strategy: contribute in 2025, but defer the deduction to your 2026 return → ~$1,500 extra saving per $10,000 contributed
Tax credits in Canada: how they work
A credit directly reduces the dollar amount of tax you owe. The formula:
Net tax owing = Gross tax owing − applicable tax credits
Non-refundable vs. refundable credits
Non-refundable credits:
- Reduce tax to zero — but if the credit exceeds your tax owing, the excess is lost (not refunded)
- Most personal tax credits are non-refundable
- Federal non-refundable credits are calculated at 15% of the base amount (the credit amount listed on Schedule 1)
Refundable credits:
- Reduce tax to zero AND can generate a cash refund even if your tax bill is already zero
- More valuable than non-refundable credits of the same amount
- Examples: GST/HST Credit, Canada Child Benefit, Climate Action Incentive, Canada Workers Benefit
Common non-refundable credits and their value
| Credit | Federal base amount (approx.) | Federal credit value (15%) |
|---|---|---|
| Basic Personal Amount | $15,705 | $2,356 |
| Age Amount (65+) | $8,396 | $1,259 |
| Pension Income Amount | up to $2,000 | up to $300 |
| Disability Tax Credit | $9,872 + supplements | $1,481+ |
| Spouse/CLP Amount | up to $15,705 | up to $2,356 |
| Caregiver for infirm dependent | $7,999+ | $1,200+ |
| Charitable donation credit | 15% on first $200; 29%+ on remainder | Varies |
| Medical expense credit | Amounts exceeding 3% of net income | 15% of qualifying |
| First-Time Home Buyer’s Amount | $10,000 | $1,500 |
| Canada Training Credit | Actual annual limit accrued | Refundable; $ for $ |
| Tuition amount | Actual tuition paid | 15%; can be transferred or carried forward |
Common refundable credits
| Credit | Who qualifies | Approximate annual value (2025) |
|---|---|---|
| GST/HST Credit | Low–moderate income; applied automatically | $519 (single) to $680+ (family) |
| Canada Child Benefit | Families with children under 18 | Up to $7,786/child under 6 |
| Climate Action Incentive | All residents in backstop provinces | $976 (AB individual) to $824 (ON) |
| Canada Workers Benefit | Working adults with low income | Up to $1,590 (single) |
| Disability Tax Credit refundable supplement | Under-18 DTC recipients | ~$600 |
Charitable donation credit: a special case
Donations are not a deduction — they are a non-refundable credit, and the rate is not a flat 15%.
| Donation amount | Federal credit rate |
|---|---|
| First $200 | 15% |
| Above $200 | 29% (or 33% if you are in the top federal bracket) |
Example: $1,200 donation
- First $200 × 15% = $30
- Remaining $1,000 × 29% = $290
- Total federal credit: $320 (plus provincial credit on top)
This means large donations are actually quite efficient — the 29%+ rate on amounts over $200 is higher than the base 15% credit rate used for most other credits.
Donations can also be carried forward up to 5 years if you don’t claim them in the year they were made — useful for bunching multiple years of donations to maximize the above-$200 credit rate.
Summary table: deduction vs. credit
| Tax Deduction | Non-Refundable Credit | Refundable Credit | |
|---|---|---|---|
| What it reduces | Taxable income | Tax owing (can’t go below zero) | Tax owing (CAN go below zero → refund) |
| Value varies by income? | Yes — scales with marginal rate | Generally no — fixed rate | No |
| Examples | RRSP, union dues, child care | BPA, DTC, pension credit | CCB, GST/HST, Climate Incentive |
| Unused amount | Carry forward (RRSP) or lost | Lost (unless transfer rules apply — tuition, DTC) | Refunded |
| Better for high earners? | Yes | No | No |
| Better for low earners? | Less valuable | Same value | More valuable (refundable regardless) |