Tax Calculator Canada Ontario 2018

Calculate your Ontario provincial income tax for 2018 using this professional tax calculator. Enter your taxable income and see how much tax you owe based on Ontario's 2018 tax brackets and rates.

How to Use This Calculator

Using this Ontario tax calculator is simple:

Enter your total taxable income for 2018 in the calculator.
Click the "Calculate" button to see your estimated provincial tax.
Review the result and compare it with your actual tax return.

The calculator uses Ontario's 2018 tax rates and brackets. For federal tax calculations, use our Canada Federal Tax Calculator.

Ontario Tax Brackets (2018)

Ontario's 2018 provincial tax rates are progressive, meaning higher incomes pay higher tax rates. The brackets are:

Taxable Income	Tax Rate
$0 - $44,703	5.05%
$44,704 - $89,405	9.15%
$89,406 - $150,000	11.16%
$150,001 - $220,000	12.16%
Over $220,000	13.16%

Note: These are provincial tax rates only. Federal tax rates are different. The calculator does not include federal tax calculations.

How Ontario Income Tax Works

Ontario's income tax system is based on progressive taxation, where higher incomes pay higher tax rates. The tax is calculated by applying the appropriate tax rate to each portion of your income that falls within a specific bracket.

Formula: Ontario Tax = Sum of (Taxable Income × Tax Rate for each bracket)

For example, if your taxable income is $50,000:

$44,703 × 5.05% = $2,257.72
($50,000 - $44,703) × 9.15% = $506.99
Total tax = $2,257.72 + $506.99 = $2,764.71

Worked Examples

Example 1: Single Income of $40,000

Taxable income: $40,000

Calculation:

$40,000 × 5.05% = $2,020.00

Total tax: $2,020.00

Example 2: Single Income of $100,000

Taxable income: $100,000

Calculation:

$44,703 × 5.05% = $2,257.72
($89,405 - $44,703) × 9.15% = $4,029.81
($100,000 - $89,405) × 11.16% = $1,249.37

Total tax: $2,257.72 + $4,029.81 + $1,249.37 = $7,536.90

Frequently Asked Questions

How is Ontario income tax calculated?

Ontario income tax is calculated using progressive tax brackets. Each portion of your income is taxed at a different rate depending on where it falls in the bracket structure.

Does this calculator include federal tax?

No, this calculator only calculates Ontario provincial tax. For federal tax calculations, use our Canada Federal Tax Calculator.

What if I have deductions?

This calculator uses your taxable income, which already includes deductions. Enter your net income after deductions to get an accurate provincial tax estimate.

Are Ontario tax rates the same every year?

No, Ontario tax rates change annually. This calculator uses the 2018 tax rates. For current year calculations, use our updated tax calculator.