Ontario Top Marginal Tax Rate: 53.53% With Surtax and Health Premium

Ontario’s top marginal tax rate is 53.53% for the 2026 tax year, and it applies only to taxable income above $258,482. That combined rate stacks the federal top rate of 33% on top of an effective Ontario provincial rate of about 20.53%. Because it is a marginal rate, it never touches the income below that threshold, no matter how much you earn overall.

How the 53.53% Rate Is Built

Two governments tax your income, and their top brackets do not line up. The federal Income Tax Act sets a top rate of 33% on individual taxable income above $258,482 for 2026.¹ Ontario’s Taxation Act, 2007 sets the highest statutory provincial rate at 13.16% on income above $220,000.² Add those and you get 46.16%, not 53.53%. The rest comes from Ontario’s surtax, a tax charged on your provincial tax bill itself, which inflates the effective provincial rate from 13.16% to roughly 20.53%.³

Because the federal top bracket starts at $258,482 and Ontario’s starts at $220,000, there is a stretch of income taxed at a slightly lower combined rate. Between $220,001 and $258,482, you pay a combined 49.82%. Only above $258,482 does the full 53.53% apply.⁴ That gap catches some people off guard when they estimate the tax on a bonus.

Ontario’s Surtax

The surtax is the reason the effective provincial rate is so much higher than the published 13.16%. It taxes your provincial tax bill in two layers. For 2026, you owe an extra 20% on basic Ontario tax exceeding $5,818, and another 36% on basic Ontario tax exceeding $7,446. Both layers stack on the highest portion of your provincial tax.³

Ontario’s government has acknowledged this structure is confusing. The surtax is a leftover from an era when provincial tax was calculated as a percentage of federal tax, but it remains in effect.³ The practical result is that the 13.16% on your return behaves like about 20.53% once the surtax runs through.

2026 Combined Brackets in Ontario

The combined federal and provincial marginal rates below apply to ordinary employment and interest income in 2026. Each rate applies only to income within that range.

Up to $16,452: 0.00%, sheltered by the basic personal amount
$16,453 to $53,891: between 19.05% and 24.10%, varying inside the range because federal and provincial credits overlap
$53,892 to $58,523: 23.15%
$58,524 to $107,785: between 29.65% and 31.48%
$107,786 to $117,045: between 33.89% and 37.91%
$117,046 to $150,000: 43.41%
$150,001 to $181,440: 44.97%
$181,441 to $220,000: 48.26%
$220,001 to $258,482: 49.82%
$258,483 and up: 53.53%

These figures include Ontario’s surtax but not the Ontario Health Premium, which is calculated separately.⁴ Both governments index their brackets for inflation each year. For 2026, the federal indexing factor is 2.0% and Ontario’s is 1.9%, which is why thresholds have shifted slightly from prior years.⁵

What the Top Bracket Actually Costs You

Reaching the 53.53% bracket does not mean you lose more than half your income to tax. That rate applies only to each dollar above $258,482. Every dollar below that threshold is taxed at the lower rates it passes through.

Take someone earning $350,000 in 2026. Only $91,518 of that income sits above $258,482 and faces the 53.53% rate. The first $16,452 is tax-free thanks to the basic personal amount, and the income between those two points is taxed at the escalating rates in the bracket table. Divide the total tax bill by total income and you get the effective rate, which for a $350,000 earner works out to roughly 38% to 40% depending on deductions and credits.

Crossing into a higher bracket never leaves you worse off overall. A common misconception is that earning one extra dollar above a threshold pushes your entire income into the higher rate. It does not. The extra dollar is taxed at the higher rate; everything below it stays the same.

How Capital Gains and Dividends Change the Rate

Not every kind of income hits 53.53% at the top. Capital gains and dividends from Canadian corporations are taxed at lower effective rates, even for top-bracket earners.

Capital gains: only 50% of a capital gain is included in taxable income. A proposed increase to two-thirds inclusion was cancelled before taking effect, so the 50% rate remains for 2026. At the top bracket, the effective combined rate on capital gains works out to roughly 26.76%.⁴
Eligible dividends: dividends from large Canadian corporations qualify for the enhanced dividend tax credit, bringing the top combined rate to 39.34%.⁴
Non-eligible dividends: dividends from smaller Canadian corporations taxed at the small business rate carry a top combined rate of 47.74%.⁴

A dollar of employment income at the top triggers 53.53% in combined tax. A dollar of capital gains at the same income level triggers roughly half that.

Ontario Health Premium

Ontario residents also pay a health premium based on taxable income. It is a fixed dollar amount that steps up with income rather than a percentage. The premium ranges from $0 if your taxable income is $20,000 or less to a maximum of $900 once taxable income exceeds $200,600.⁶

Because the premium caps at $900, its impact shrinks at higher incomes. For someone earning $250,000, it adds roughly 0.36% to their total tax burden. It is calculated on your tax return and collected alongside your income tax, so there is no separate bill.

Reducing Tax at the Top Bracket

The most direct tool for high-income Ontario residents is the Registered Retirement Savings Plan. Every dollar contributed is deducted from taxable income, so at the top bracket each dollar of contribution saves roughly 53 cents in tax. The 2026 RRSP contribution limit is $33,810, or 18% of the prior year’s earned income, whichever is less.⁷ The tax is deferred rather than eliminated, and comes back when you withdraw, ideally in retirement when your marginal rate is lower.

Alternative Minimum Tax at High Incomes

High earners who use deductions, credits, or preferential capital gains rates to substantially lower their tax bill may trigger the federal Alternative Minimum Tax. The AMT recalculates your tax at a flat 20.5% rate while disallowing many deductions, then compares that result to your regular tax. You pay whichever amount is higher.

For 2026, the AMT basic exemption is $181,440. Income below that threshold is not subject to AMT even under the alternative calculation. The AMT most often affects individuals who claim large capital gains deductions, significant charitable donation credits, or substantial tax shelter losses. If you pay AMT in a given year, the excess over your regular tax can be carried forward and applied against regular tax in the following seven years.

1
Justice Laws Website. Income Tax Act
2
Ontario.ca. Taxation Act, 2007 – S.O. 2007, c. 11, Sched. A
3
Government of Ontario. Chapter V, Section A: Tax Measures – Section: Improving Fairness and Transparency of Ontario’s Personal Income Tax
4
Ernst & Young. Combined federal and provincial personal income tax rates – 2026
5
Government of Canada. Income tax rates and income thresholds
6
Government of Ontario. Health premium
7
Canada Revenue Agency. MP, DB, RRSP, DPSP, ALDA, TFSA limits, YMPE and the YAMPE