Provincial TaxesOct 20, 2025
What are the Ontario surtax and health premium for 2024?
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Ontario residents pay additional amounts on top of the basic provincial income tax: the Ontario surtax and the Ontario Health Premium. These can significantly increase your total tax burden.
Ontario Surtax:
The Ontario surtax is an additional tax on top of your basic Ontario tax. For 2024, the surtax is:
- 20% of basic Ontario tax in excess of C$4,991, plus
- 36% of basic Ontario tax in excess of C$6,387
The surtax effectively creates higher marginal tax rates for middle and upper-income earners in Ontario. It applies before tax credits reduce your basic Ontario tax.
Ontario Health Premium:
The Ontario Health Premium is a separate levy based on your taxable income. It is calculated on your tax return and cannot be reduced by tax credits. The rates for 2024 are:
| Taxable Income | Health Premium |
|---|---|
| C$20,000 or less | C$0 |
| C$20,001 to C$25,000 | 6% of income above C$20,000 |
| C$25,001 to C$36,000 | C$300 |
| C$36,001 to C$38,500 | C$300 + 6% of income above C$36,000 |
| C$38,501 to C$48,000 | C$450 |
| C$48,001 to C$48,600 | C$450 + 25% of income above C$48,000 |
| C$48,601 to C$72,000 | C$600 |
| C$72,001 to C$72,600 | C$600 + 25% of income above C$72,000 |
| C$72,601 to C$200,000 | C$750 |
| C$200,001 to C$200,600 | C$750 + 25% of income above C$200,000 |
| Over C$200,600 | C$900 |
Key details:
- The maximum Ontario Health Premium is C$900 per year.
- It is not an insurance premium and does not provide additional health coverage beyond OHIP.
- The health premium is calculated on Form ON428 and included in your Ontario tax payable.
- It cannot be claimed as a medical expense or tax deduction.
Ontariosurtaxhealth-premiumprovincial-tax2024
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Disclaimer: This information is for general educational purposes and is not professional tax advice. Tax situations vary. Consult a qualified tax professional for advice specific to your circumstances.