What the marginal rate tells you
Canada taxes income in layers. Each layer, or bracket, has its own rate, and a rate applies only to the income that falls inside that bracket. Your marginal rate is the rate on the top layer of your taxable income, the part you would add to or remove if your income changed by a small amount.
For an Ontario resident, two sets of brackets apply at the same time: federal and provincial. The marginal rate is the federal rate for your bracket plus the Ontario rate for your bracket. The brackets do not start and stop at the same income levels, so the combined rate can change at more than one point.
A worked example with 2026 rates
Suppose an Ontario resident has $80,000 of taxable income in 2026. That amount sits in the federal 20.5% bracket, which runs from $58,523 to $117,045, and in the Ontario 9.15% bracket, which runs from $53,891 to $107,785. Adding the two rates gives a combined marginal rate of 29.65%.
On that basis, an extra $1,000 of taxable income would attract about $296.50 more tax, and a $1,000 deduction would reduce tax by about the same amount. This is an illustration only. It ignores credits and other provincial amounts, so your own figure can differ.
Where the marginal rate gets misused
A common worry is that a raise can push you into a higher bracket and leave you with less take-home pay. It cannot. Only the income above the bracket threshold is taxed at the higher rate, and the income below it keeps its lower rate.
The marginal rate is also not a complete picture of what happens when income changes. Benefits, credits and some deductions are calculated from your income, so the effect on your whole return can differ from the bracket rate alone. Treat the marginal rate as a starting estimate for a decision, then confirm it against the full return.
What to discuss with your accountant
Ask what your combined marginal rate is on employment, self-employment, interest, dividends and capital gains, because these income types are not all taxed alike. That matters when you decide how much to put into an RRSP, whether to defer income to the next year, or how to pay yourself from a corporation.
Bring your latest notice of assessment and a rough estimate of this year’s income. The conversation is more useful when it starts from your actual taxable income rather than a salary figure that has not yet been reduced by deductions.
Sources & editorial notes
Sources checked October 24, 2026. The examples are illustrative and provide general information. Discuss how the guidance applies to your circumstances with your accountant.
- 2026 personal income tax rates and bracketsCanada Revenue Agency
- Claiming deductions, credits, and expensesCanada Revenue Agency
Rules and guidance can change. Use the current official source and confirm the treatment for your facts. To flag an error, contact Sora.