Ontario Surtax 2018 Calculator
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Reviewed by Calculator Editorial Team
In 2018, Ontario implemented a temporary surtax on high-income earners to help fund the province's budget. This calculator helps you determine how much you would have paid in Ontario surtax based on your 2018 income.
What is Ontario Surtax?
The Ontario Surtax was a temporary tax imposed on individuals earning over $250,000 in 2018. The surtax was introduced to help fund the province's budget and was part of Ontario's fiscal strategy to address budget shortfalls.
The surtax was structured as an additional tax on income above $250,000, with rates ranging from 16.5% to 25%. The exact rate applied depended on your total income for the year.
How Was Ontario Surtax Calculated?
The Ontario Surtax was calculated based on your total income for 2018. The surtax brackets were as follows:
| Income Range | Surtax Rate |
|---|---|
| $250,001 to $300,000 | 16.5% |
| $300,001 to $400,000 | 17.5% |
| $400,001 to $500,000 | 18.5% |
| Over $500,000 | 25% |
The surtax was applied to the portion of your income that exceeded $250,000. For example, if you earned $325,000, the surtax would be calculated on $75,000 ($325,000 - $250,000) at the 17.5% rate.
Who Was Affected?
The Ontario Surtax primarily affected high-income earners, including:
- Individuals earning over $250,000
- Corporate executives and senior managers
- Wealthy investors and business owners
- Professionals in high-paying fields such as law, medicine, and finance
Lower-income earners were not affected by the surtax, as it only applied to income above $250,000.
How to Use This Calculator
To calculate your Ontario Surtax for 2018:
- Enter your total income for 2018 in the calculator.
- Click the "Calculate" button to see your surtax amount.
- Review the result and any additional information provided.
The calculator will show you how much you would have paid in Ontario Surtax based on your income.
Example Calculation
Let's say you earned $325,000 in 2018. Here's how the Ontario Surtax would be calculated:
Step 1: Determine the taxable income above $250,000.
$325,000 - $250,000 = $75,000
Step 2: Apply the surtax rate of 17.5% to the taxable amount.
$75,000 × 17.5% = $13,125
Result: Your Ontario Surtax for 2018 would have been $13,125.
This example shows how the calculator would determine your surtax based on your income.