Marginal Tax Rate Explained
Understand marginal versus average tax rates and what an increase in income really does to your taxes.
The short version
- Your marginal tax rate is the tax on your next dollar of income. Your average rate is your total tax divided by your total income.
- Example, Ontario, $100,000 of income in 2026: about $21,521 of income tax, an average rate of 21.5%, and a marginal rate of 31.5%.
- Use the marginal rate for decisions (a raise, overtime, an RRSP contribution). Use the average rate for budgeting.
- Moving into a higher bracket never makes you worse off on income tax alone.
Marginal Tax Rate in Canada, Explained Simply
Every year somebody turns down overtime because it will “push them into a higher bracket and they'll take home less.” They won't. Only the dollars above the bracket line pay the higher rate. The dollars below it don't notice.
Think of brackets as buckets. Your first $58,523 fills the 14% federal bucket. Only once it's full do dollars start landing in the 20.5% bucket. Earn $100 more, and that $100 lands in whatever bucket you're currently filling. That rate, federal plus provincial, is your marginal rate.
A Worked Example
Someone in Ontario with $100,000 of ordinary income in 2026, using our income tax calculator (income tax only, no CPP or EI):
| What | Amount |
|---|---|
| Federal tax | $14,392.73 |
| Ontario tax (including surtax) | $7,127.83 |
| Total income tax | $21,520.55 |
| Average rate | 21.52% |
| Marginal rate (tax on the next $100) | 31.48% |
The 31.48% is 20.5% federal plus 9.15% Ontario, with Ontario's surtax adding 20% on top of the Ontario part. That's why the next $100 costs $31.48 in tax, while the whole $100,000 averaged only 21.5%. Same person in Alberta: about 30.5% at the margin; in British Columbia, about 28.2%.
The full set of brackets is in our guide to Canadian income tax brackets, and every province side by side in provincial taxes in Canada.
What is your marginal rate?
Give the assistant your income and province. It runs the calculator and tells you your average rate, your marginal rate, and what a raise or RRSP contribution would really change.
Why the Marginal Rate Is the One That Matters
- RRSP and FHSA contributions save tax at your marginal rate. At 31.48%, a $5,000 RRSP contribution saves about $1,574. The RRSP tax savings calculator does it exactly.
- A raise or overtime is taxed at your marginal rate (plus CPP and EI until you pass their maximums).
- Capital gains are taxed at half your marginal rate, because only half is included. See capital gains tax in Canada.
- Deductions are worth your marginal rate; most credits are worth a flat 14% federally. That's the difference explained in Canadian tax deductions.
The Hidden Marginal Rate: Benefit Clawbacks
Here's the part the bracket tables leave out. Several benefits shrink as income rises, which acts like extra tax on the next dollar:
- Old Age Security is reduced by 15% of net income above $95,323 for 2026.
- The Canada Child Benefit phases out as family net income rises.
- The Canada Groceries and Essentials Benefit (formerly the GST/HST credit) and the Canada Workers Benefit phase out at lower incomes.
So a family in a phase-out range can face an effective marginal rate well above the bracket rate. It's also why an RRSP or FHSA deduction can be worth more to them than the bracket alone suggests.
Three Rules of Thumb
- Never refuse income to “stay in a lower bracket.” Income tax alone never makes a raise cost you money.
- Deduct in high-income years, withdraw in low-income years. That's the whole RRSP strategy in one line.
- Watch the clawback zones if you receive OAS or the Canada Child Benefit: your real marginal rate is higher than the table says.
Marginal Tax Rate Questions
What is the difference between marginal and average tax rate?
The marginal rate is the tax on your next dollar of income. The average rate is your total income tax divided by your total income. In Ontario at $100,000 in 2026, they are about 31.5% and 21.5%.
Will a raise put me in a higher bracket and lower my take-home pay?
No. Only the income above the bracket threshold is taxed at the higher rate. Income-tested benefits can shrink, but income tax alone never makes a raise cost you money.
What is the highest marginal tax rate in Canada?
The top federal rate is 33%. Combined with provincial tax, top marginal rates on ordinary income range from about 44.5% (Nunavut) to about 54.8% (Newfoundland and Labrador, on income over about $1.14 million).
Why does my marginal rate matter for RRSPs?
An RRSP contribution is a deduction, so it saves tax at your marginal rate. The higher your marginal rate, the more each contribution saves.
Figures calculated with our 2026 rules engine (CRA T4127 payroll formulas and provincial budgets) for ordinary income with basic credits only; see our sources. OAS threshold from CRA's 2026 indexation table. Checked October 2026.
Last reviewed October 5, 2026 against CRA and Government of Canada sources. How we check our facts.