The marginal tax rate is the rate paid on the next dollar of income earned. The effective (or average) tax rate is total tax divided by total income. Canada’s progressive tax system means marginal rate is always equal to or higher than effective rate, and only the marginal rate is relevant for decisions about earning extra income, contributing to RRSP, or realizing capital gains.
The two rates defined
| Rate | Definition | What it tells you |
|---|---|---|
| Marginal rate | Rate applied to the next dollar of income (the rate of the bracket your last dollar falls into) | The tax cost of additional income or the tax savings from a deduction |
| Effective (average) rate | Total tax divided by total income | The proportion of total income paid in tax — a summary statistic, not a decision input |
Worked example: $90,000 income in Ontario (2026)
Federal tax (2026 brackets):
- 14% on first $58,523 = $8,193.22
- 20.5% on next $31,477 ($58,523 to $90,000) = $6,452.79
- Total federal tax: $14,646.01
- Less federal Basic Personal Amount credit: $16,452 × 14% = $2,303.28
- Net federal tax: $12,342.73
Ontario tax: roughly $5,300 after BPA credit. Combined federal + Ontario ≈ $17,640.
| Rate type | Value |
|---|---|
| Marginal rate (combined federal + Ontario at $90,000) | 29.65% (20.5% federal + 9.15% Ontario) |
| Effective (average) rate | $17,640 / $90,000 = 19.6% |
The next dollar earned is taxed at 29.65%. The average dollar earned has been taxed at 19.6%. These are the same income, two different ways of measuring tax.
Why marginal rate matters for decisions
Almost every tax decision comes down to the marginal rate, not the effective rate:
- RRSP contribution: A $5,000 RRSP contribution at a 30% marginal rate generates $1,500 in tax savings. The effective rate is irrelevant.
- Bonus or freelance income: An extra $10,000 of work income at a 35% marginal rate keeps $6,500 after tax. Don’t compare to effective rate to decide whether to take the work.
- Capital gain realization: Realizing a $20,000 gain at 50% inclusion adds $10,000 to taxable income, taxed at the marginal rate. If realizing pushes you into the next bracket, part of the gain is at the higher rate.
- Spouse income splitting: Shifting $1 of income from a high-marginal-rate spouse to a low-marginal-rate spouse saves the difference between the two marginal rates, dollar for dollar.
Why the effective rate misleads
Quoting an effective rate in conversations about tax decisions creates incorrect intuitions. A taxpayer with a 19.6% effective rate who thinks a $5,000 RRSP contribution saves $980 (5,000 × 19.6%) is wrong — it actually saves $1,485 (at 29.65% marginal). The effective rate works for budgeting and historical reporting; it does not work for forward-looking decisions.
Combined federal and provincial marginal rates (2026, mid-bracket)
| Province | Marginal rate at $90,000 (combined) | Marginal rate at $250,000 (combined) |
|---|---|---|
| British Columbia | 28.20% | 49.80% |
| Alberta | 30.50% | 47.00% |
| Saskatchewan | 33.00% | 47.50% |
| Manitoba | 33.25% | 50.40% |
| Ontario | 29.65% | 53.53% |
| Quebec | 36.12% | 53.31% |
| New Brunswick | 29.00% | 52.50% |
| Nova Scotia | 35.45% | 54.00% |
| PEI | 33.45% | 51.37% |
| Newfoundland | 29.00% | 54.30% |
Approximate combined rates; exact figures depend on net income, deductions, and credits applicable to the individual.
Tax brackets are not the same as marginal rates
A common misunderstanding: “I’ll move into the next bracket so all my income gets taxed at the higher rate.” This is wrong. Only the income within each bracket is taxed at that bracket’s rate. Moving into the 26% federal bracket means dollars within that bracket are taxed at 26%; dollars in lower brackets stay at their lower rates. Marginal rate refers to the rate on the next dollar, not the rate on all income.
How to find your marginal rate
Your marginal rate is the federal bracket rate at your income level plus the provincial bracket rate at your income level (and surtax in Ontario at higher levels). Tax software and tax tables produced by accounting firms publish combined marginal rates by income and province. The Canadian Money Help combined income tax calculators show the marginal rate as part of their output for any income level in any province.
Frequently asked questions
- What is the difference between marginal and effective tax rate?
- Marginal rate is the rate applied to the next dollar of income. Effective rate is total tax divided by total income. Marginal rate is always equal to or higher than effective rate in a progressive tax system.
- Which rate matters for an RRSP contribution decision?
- Marginal rate. A $5,000 contribution at a 30% marginal rate generates $1,500 in tax savings, regardless of the taxpayer's effective rate.
- Will moving into a higher tax bracket cost me on all my income?
- No. Each bracket's rate applies only to income within that bracket. Earning a dollar in the 26% bracket is taxed at 26%; lower-bracket dollars stay at lower rates.
- What is the top combined marginal rate in Canada?
- Approximately 53% to 54% in most provinces at incomes above $253,414 (the top federal bracket). Quebec, Nova Scotia, Ontario, and Newfoundland reach the highest combined rates.
- Where do I find my marginal rate?
- Combined federal + provincial bracket rates published by CRA and provincial finance ministries. Most tax calculators show the marginal rate as part of their output.
- Does the marginal rate change with deductions?
- Deductions (RRSP, child care, union dues) reduce taxable income, potentially moving the taxpayer into a lower bracket and reducing marginal rate. The marginal rate is the rate at the post-deduction income level.
- Why is the effective rate useful at all?
- Effective rate is useful for budgeting (estimating total tax burden) and historical reporting. It is not useful for forward-looking decisions about additional income or deductions.